ffmprovisr

Making FFmpeg Easier

FFmpeg is a powerful tool for manipulating audiovisual files. Unfortunately, it also has a steep learning curve, especially for users unfamiliar with a command line interface. This app helps users through the command generation process so that more people can reap the benefits of FFmpeg.

Each button displays helpful information about how to perform a wide variety of tasks using FFmpeg. To use this site, click on the task you would like to perform. A new window will open up with a sample command and a description of how that command works. You can copy this command and understand how the command works with a breakdown of each of the flags.

For FFmpeg basics, check out the program’s official website.

For Bash and command line basics, try the Command Line Crash Course.

What do you want to do?

Select from the following.

Change formats

WAV to MP3

ffmpeg -i input_file.wav -write_id3v1 1 -id3v2_version 3 -dither_method modified_e_weighted -out_sample_rate 48k -b:a 320k output_file.mp3

This will convert your WAV files to MP3s.

ffmpeg: starts the command
-i input_file: path and name of the input file
-write_id3v1 1: Write ID3v1 tag. This will add metadata to the old MP3 format, assuming you’ve embedded metadata into the WAV file.
-id3v2_version 3: Write ID3v2 tag. This will add metadata to a newer MP3 format, assuming you’ve embedded metadata into the WAV file.
-dither_method modified_e_weighted: Dither makes sure you don’t unnecessarily truncate the dynamic range of your audio.
-out_sample_rate 48k: Sets the audio sampling frequency to 48 kHz. This can be omitted to use the same sampling frequency as the input.
-b:a 320k: This sets the bit rate at the highest rate the MP3 format allows. Reduce this to 160k for mono files.
output_file: path and name of the output file

Transcode into a deinterlaced Apple ProRes LT

ffmpeg -i input_file -c:v prores -profile:v 1 -vf yadif -c:a pcm_s16le output_file.mov

This command transcodes an input file into a deinterlaced Apple ProRes 422 LT file with 16-bit linear PCM encoded audio. The file is deinterlaced using the yadif filter (Yet Another De-Interlacing Filter).

ffmpeg

starts the command

-i input_file

path, name and extension of the input file

-c:v prores

Tells ffmpeg to transcode the video stream into Apple ProRes 422

-profile:v 1

Declares profile of ProRes you want to use. The profiles are explained below:

0 = ProRes 422 (Proxy)
1 = ProRes 422 (LT)
2 = ProRes 422 (Standard)
3 = ProRes 422 (HQ)

-vf yadif

Runs a deinterlacing video filter (yet another deinterlacing filter) on the new file

-c:a pcm_s16le

Tells ffmpeg to encode the audio stream in 16-bit linear PCM

output_file

path, name and extension of the output file
The extension for the QuickTime container is .mov.

Transcode to H.264

ffmpeg -i input_file -c:v libx264 -pix_fmt yuv420p -c:a copy output_file

This command takes an input file and transcodes it to H.264 with an .mp4 wrapper, keeping the audio the same codec as the original. The libx264 codec defaults to a “medium” preset for compression quality and a CRF of 23. CRF stands for constant rate factor and determines the quality and file size of the resulting H.264 video. A low CRF means high quality and large file size; a high CRF means the opposite.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-c:v libx264: tells ffmpeg to change the video codec of the file to H.264
-pix_fmt yuv420p: libx264 will use a chroma subsampling scheme that is the closest match to that of the input. This can result in YUV 4:2:0, 4:2:2, or 4:4:4 chroma subsampling. QuickTime and most other non-FFmpeg based players can’t decode H.264 files that are not 4:2:0. In order to allow the video to play in all players, you can specify 4:2:0 chroma subsampling.
-c:a copy: tells ffmpeg not to change the audio codec
output_file: path, name and extension of the output file

In order to use the same basic command to make a higher quality file, you can add some of these presets:

ffmpeg -i input_file -c:v libx264 -pix_fmt yuv420p -preset veryslow -crf 18 -c:a copy output_file

-preset veryslow: This option tells ffmpeg to use the slowest preset possible for the best compression quality.
-crf 18: Specifying a lower CRF will make a larger file with better visual quality. 18 is often considered a “visually lossless” compression.

H.264 from DCP

ffmpeg -i input_video_file.mxf -i input_audio_file.mxf -c:v libx264 -pix_fmt yuv420p -c:a aac output_file.mp4

This will transcode mxf wrapped video and audio files to an H.264 encoded .mp4 file. Please note this only works for unencrypted, single reel DCPs.

ffmpeg: starts the command
-i input_video_file: path and name of the video input file. This extension must be .mxf
-i input_audio_file: path and name of the audio input file. This extension must be .mxf
-c:v libx264: transcodes video to H.264
-pix_fmt yuv420p: sets pixel format to yuv420p for greater compatibility with media players
-c:a aac: re-encodes using the AAC audio codec
Note that sadly MP4 cannot contain sound encoded by a PCM (Pulse-Code Modulation) audio codec
output_file.mp4: path, name and .mp4 extension of the output file

Variation: Copy PCM audio streams by using Matroska instead of the MP4 container

ffmpeg -i input_video_file.mxf -i input_audio_file.mxf -c:v libx264 -pix_fmt yuv420p -c:a copy output_file.mkv

-c:a copy: re-encodes using the same audio codec
output_file.mkv: path, name and .mkv extension of the output file

Upscaled, Pillar-boxed HD H.264 Access Files from SD NTSC source

ffmpeg -i input_file -c:v libx264 -filter:v "yadif,scale=1440:1080:flags=lanczos,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,format=yuv420p" output_file

ffmpeg: Calls the program ffmpeg
-i: for input video file and audio file
-c:v libx264: encodes video stream with libx264 (h264)
-filter:v: calls an option to apply filtering to the video stream. yadif deinterlaces. scale and pad do the math! resizes the video frame then pads the area around the 4:3 aspect to complete 16:9. flags=lanczos uses the Lanczos scaling algorithm which is slower but better than the default bilinear. Finally, format specifies a pixel format of YUV 4:2:0. The very same scaling filter also downscales a bigger image size into HD.
output_file: path, name and extension of the output file

Transform 4:3 aspect ratio into 16:9 with pillarbox

Transform a video file with 4:3 aspect ratio into a video file with 16:9 aspect ration by correct pillarboxing.

ffmpeg -i input_file -filter:v "pad=ih*16/9:ih:(ow-iw)/2:(oh-ih)/2" -c:a copy output_file

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-filter:v "pad=ih*16/9:ih:(ow-iw)/2:(oh-ih)/2": video padding
This resolution independent formula is actually padding any aspect ratio into 16:9 by pillarboxing, because the video filter uses relative values for input width (iw), input height (ih), output width (ow) and output height (oh).
-c:a copy: re-encodes using the same audio codec
For silent videos you can replace -c:a copy by -an.
output_file: path, name and extension of the output file

Transform 16:9 aspect ratio video into 4:3 with letterbox

Transform a video file with 16:9 aspect ratio into a video file with 4:3 aspect ration by correct letterboxing.

ffmpeg -i input_file -filter:v "pad=iw:iw*3/4:(ow-iw)/2:(oh-ih)/2" -c:a copy output_file

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-filter:v "pad=iw:iw*3/4:(ow-iw)/2:(oh-ih)/2": video padding
This resolution independent formula is actually padding any aspect ratio into 4:3 by letterboxing, because the video filter uses relative values for input width (iw), input height (ih), output width (ow) and output height (oh).
-c:a copy: re-encodes using the same audio codec
For silent videos you can replace -c:a copy by -an.
output_file: path, name and extension of the output file

Create FFV1 Version 3 video in a Matroska container with framemd5 of input

ffmpeg -i input_file -map 0 -dn -c:v ffv1 -level 3 -g 1 -slicecrc 1 -slices 16 -c:a copy output_file.mkv -f framemd5 -an md5_output_file

This will losslessly trancode your video with the FFV1 Version 3 codec in a Matroska container. In order to verify losslessness, a framemd5 of the source video is also generated. For more information on FFV1 encoding, try the ffmpeg wiki.

ffmpeg: starts the command.
-i input_file: path, name and extension of the input file.
-map 0: Map all streams that are present in the input file. This is important as ffmpeg will map only one stream of each type (video, audio, subtitles) by default to the output video.
-dn: ignore data streams (data no). The matroska container does not allow data tracks.
-c:v ffv1: specifies the FFV1 video codec.
-level 3: specifies Version 3 of the FFV1 codec.
-g 1: specifies intra-frame encoding, or GOP=1.
-slicecrc 1: Adds CRC information for each slice. This makes it possible for a decoder to detect errors in the bitstream, rather than blindly decoding a broken slice.
-slices 16: Each frame is split into 16 slices. 16 is a good trade-off between filesize and encoding time. [more]
-c:a copy: copies all mapped audio streams.
output_file.mkv: path and name of the output file. Use the .mkv extension to save your file in a matroska container. Optionally, choose a different extension if you want a different container, such as .mov or .avi.
-f framemd5: Decodes video with the framemd5 muxer in order to generate md5 checksums for every frame of your input file. This allows you to verify losslessness when compared against the framemd5s of the output file.
-an: ignores the audio stream when creating framemd5 (audio no)
framemd5_output_file: path, name and extension of the framemd5 file.

Change Display Aspect Ratio without reencoding video

ffmpeg -i input_file -c:v copy -aspect 4:3 output_file

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-c:v copy: Copy all mapped video streams.
-aspect 4:3: Change Display Aspect Ratio to 4:3. Experiment with other aspect ratios such as 16:9. If used together with -c:v copy, it will affect the aspect ratio stored at container level, but not the aspect ratio stored in encoded frames, if it exists.
output_file: path, name and extension of the output file

MKV to MP4

ffmpeg -i input_file.mkv -c:v copy -c:a aac output_file.mp4

This will convert your Matroska (MKV) files to MP4 files.

ffmpeg: starts the command
-i input_file: path and name of the input file
The extension for the Matroska container is .mkv.
-c:v copy: re-encodes using the same video codec
-c:a aac: re-encodes using the AAC audio codec
Note that sadly MP4 cannot contain sound encoded by a PCM (Pulse-Code Modulation) audio codec.
For silent videos you can replace -c:a aac by -an.
output_file: path and name of the output file
The extension for the MP4 container is .mp4.

Make derivative variations

Create GIF

Create high quality GIF

ffmpeg -ss HH:MM:SS -i input_file -filter_complex "fps=10,scale=500:-1:flags=lanczos,palettegen" -t 3 palette.png

ffmpeg -ss HH:MM:SS -i input_file -i palette.png -filter_complex "[0:v]fps=10,scale=500:-1:flags=lanczos[v],[v][1:v]paletteuse" -t 3 -loop 6 output_file

The first command will use the palettegen filter to create a custom palette, then the second command will create the GIF with the paletteuse filter. The result is a high quality GIF.

ffmpeg: starts the command
-ss HH:MM:SS: starting point of the gif. If a plain numerical value is used it will be interpreted as seconds
-i input_file: path, name and extension of the input file
-filter_complex "fps=frame rate,scale=width:height,palettegen": a complex filtergraph using the fps filter to set frame rate, the scale filter to resize, and the palettegen filter to generate the palette. The scale value of -1 preserves the aspect ratio
-t 3: duration in seconds (here 3; can be specified also with a full timestamp, i.e. here 00:00:03)
-loop 6: number of times to loop the gif. A value of -1 will disable looping. Omitting -loop will use the default which will loop infinitely
output_file: path, name and extension of the output file

Simpler GIF creation

ffmpeg -ss HH:MM:SS -i input_file -vf "fps=10,scale=500:-1" -t 3 -loop 6 output_file

This is a quick and easy method. Dithering is more apparent than the above method using the palette* filters, but the file size will be smaller. Perfect for that “legacy” GIF look.

One thumbnail

ffmpeg -i input_file -ss 00:00:20 -vframes 1 thumb.png

This command will grab a thumbnail 20 seconds into the video.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-ss 00:00:20: seeks video file to 20 seconds into the video
-vframes 1: sets the number of frames (in this example, one frame)
output file: path, name and extension of the output file

Many thumbnails

ffmpeg -i input_file -vf fps=1/60 out%d.png

This will grab a thumbnail every minute and output sequential png files.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-ss 00:00:20: seeks video file to 20 seconds into the video
-vf fps=1/60: -vf is an alias for -filter:v, which creates a filtergraph to use for the streams. The rest of the command identifies filtering by frames per second, and sets the frames per second at 1/60 (which is one per minute). Omitting this will output all frames from the video
output file: path, name and extension of the output file. In the example out%d.png where %d is a regular expression that adds a number (d is for digit) and increments with each frame (out1.png, out2.png, out3.png…). You may also chose a regular expression like out%04d.png which gives 4 digits with leading 0 (out0001.png, out0002.png, out0003.png, …).

Generate thumbnails from a video at regular intervals

ffmpeg -i input_file -ss 00:12.235 -i "$f" -vframes 1 output_file

Create one thumbnail in JPEG format from a video file at a specific time. In this example: 0hours:0minutes:12sec.235msec

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-vframes 1: Tells ffmpeg to create a still image from file.
-ss 00:12.235: Specifies the specific point in input file where the still will be captured.
output_file: path, name and extension of the output file

Excerpt from beginning

ffmpeg -i input_file -t 5 -c copy output_file

This command captures a certain portion of a video file, starting from the beginning and continuing for the amount of time (in seconds) specified in the script. This can be used to create a preview file, or to remove unwanted content from the end of the file. To be more specific, use timecode, such as 00:00:05.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-t 5: Tells ffmpeg to stop copying from the input file after a certain time, and specifies the number of seconds after which to stop copying. In this case, 5 seconds is specified.
-c copy: use stream copy mode to re-mux instead of re-encode
output_file: path, name and extension of the output file

Trim a video without re-encoding

ffmpeg -i input_file -ss 00:02:00 -to 00:55:00 -c copy output_file

This command allows you to create an excerpt from a video file without re-encoding the image data.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-ss 00:02:00: sets in point at 00:02:00
-to 00:55:00: sets out point at 00:55:00
-c copy: use stream copy mode (no re-encoding)
Note: watch out when using -ss with -c copy if the source is encoded with an interframe codec (e.g., H.264). Since ffmpeg must split on i-frames, it will seek to the nearest i-frame to begin the stream copy.
output_file: path, name and extension of the output file

Variation: trim video by setting duration, by using -t instead of -to

ffmpeg -i input_file -ss 00:05:00 -t 10 -c copy output_file

-ss 00:05:00 -t 10: Beginning five minutes into the original video, this command will create a 10-second-long excerpt.

Excerpt to end

ffmpeg -i input_file -ss 5 -c copy output_file

This command copies a video file starting from a specified time, removing the first few seconds from the output. This can be used to create an excerpt, or remove unwanted content from the beginning of a video file.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-ss 5: Tells ffmpeg what timecode in the file to look for to start copying, and specifies the number of seconds into the video that ffmpeg should start copying. To be more specific, you can use timecode such as 00:00:05.
-c copy: use stream copy mode to re-mux instead of re-encode
output_file: path, name and extension of the output file

Excerpt from end

ffmpeg -sseof -5 -i input_file -c copy output_file

This command copies a video file starting from a specified time before the end of the file, removing everything before from the output. This can be used to create an excerpt, or extract content from the end of a video file (e.g. for extracting the closing credits).

ffmpeg: starts the command
-sseof -5: This parameter must stay before the input file. It tells ffmpeg what timecode in the file to look for to start copying, and specifies the number of seconds from the end of the video that ffmpeg should start copying. The end of the file has index 0 and the minus sign is needed to reference earlier portions. To be more specific, you can use timecode such as -00:00:05. Note that in most file formats it is not possible to seek exactly, so ffmpeg will seek to the closest point before.
-i input_file: path, name and extension of the input file
-c copy: use stream copy mode to re-mux instead of re-encode
output_file: path, name and extension of the output file

Create ISO files for DVD access

Create an ISO file that can be used to burn a DVD. Please note, you will have to install dvdauthor. To install dvd author using Homebrew run: brew install dvdauthor

ffmpeg -i input_file -aspect 4:3 -target ntsc-dvd output_file.mpg

This command will take any file and create an MPEG file that dvdauthor can use to create an ISO.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-aspect 4:3: declares the aspect ratio of the resulting video file. You can also use 16:9.
-target ntsc-dvd: specifies the region for your DVD. This could be also pal-dvd.
output_file.mpg: path and name of the output file. The extension must be .mpg

Preservation

Create Bash Script named “Rewrap-MXF.sh” to do Batch FFmpeg Processing

for f in *.MXF; do ffmpeg -i "$f" -map 0 -c copy "${f%.MXF}.mov"; done

Re-wrap .MFX files in a specified directory to .mov files by using this code within a .sh file. The shell script (.sh file) and all MXF files must be contained in the same directory, and the script must be run from the directory itself (cd ~/Desktop/MXF_file_directory). Execute .sh file with the command sh Rewrap-MXF.sh

-map 0: select all input streams to map to output
-c copy: enable stream copy. This will re-mux wihout re-encoding, so quality is preserved

Modify the ffmpeg script as needed to perform different transcodes :)

Create MD5 checksums

ffmpeg -i input_file -f framemd5 -an output_file

This will create an MD5 checksum per video frame.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-f framemd5: library used to calculate the MD5 checksums
-an: ignores the audio stream (audio no)
output_file: path, name and extension of the output file

You may verify an MD5 checksum file created this way by using a Bash script.

Pull specs from video file

ffprobe -i input_file -show_format -show_streams -show_data -print_format xml

This command extracts technical metadata from a video file and displays it in xml.

ffmpeg documentation on ffprobe (full list of flags, commands, www.ffmpeg.org/ffprobe.html)

ffprobe: starts the command
-i input_file: path, name and extension of the input file
-show_format: outputs file container informations
-show_streams: outputs audio and video codec informations
-show_data: adds a short “hexdump” to show_streams command output
-print_format: Set the output printing format (in this example “xml”; other formats include “json” and “flat”)

Check FFV1 Version 3 fixity

ffmpeg -i input_file -f null -

This decodes your video and displays any crc checksum mismatches. These errors will display in your terminal like this: [ffv1 @ 0x1b04660] CRC mismatch 350FBD8A!at 0.272000 seconds

Frame crcs are enabled by default in FFV1 Version 3.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-f null: Video is decoded with the null muxer. This allows video decoding without creating an output file.
-: FFmpeg syntax requires a specified output, and - is just a place holder. No file is actually created.

Check video file interlacement patterns

ffmpeg -i input file -vf idet -f null -

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-vf idet: This calls the idet (detect video interlacing type) filter.
-f null: Video is decoded with the null muxer. This allows video decoding without creating an output file.
-: FFmpeg syntax requires a specified output, and - is just a place holder. No file is actually created.

Test videos

Makes a mandelbrot test pattern video

ffmpeg -f lavfi -i mandelbrot=size=1280x720:rate=25 -c:v libx264 -t 10 output_file

ffmpeg: starts the command
-f lavfi: tells ffmpeg to use the Libavfilter input virtual device [more]
-i mandelbrot=size=1280x720:rate=25: asks for the mandelbrot test filter as input. Adjusting the size and rate options allow you to choose a specific frame size and framerate. [more]
-c:v libx264: transcodes video from rawvideo to H.264. Set -pix_fmt to yuv420p for greater H.264 compatibility with media players.
-t 10: specifies recording time of 10 seconds
output_file: path, name and extension of the output file. Try different file extensions such as mkv, mov, mp4, or avi.

Makes a SMPTE bars test pattern video

ffmpeg -f lavfi -i smptebars=size=720x576:rate=25 -c:v prores -t 10 output_file

ffmpeg: starts the command
-f lavfi: tells ffmpeg to use the Libavfilter input virtual device [more]
-i smptebars=size=720x576:rate=25: asks for the smptebars test filter as input. Adjusting the size and rate options allow you to choose a specific frame size and framerate. [more]
-c:v prores: transcodes video from rawvideo to Apple ProRes 4:2:2.
-t 10: specifies recording time of 10 seconds
output_file: path, name and extension of the output file. Try different file extensions such as mov or avi.

Make a test pattern video

ffmpeg -f lavfi -i testsrc=size=720x576:rate=25 -c:v v210 -t 10 output_file

ffmpeg: starts the command
-f lavfi: tells ffmpeg to use the libavfilter input virtual device [more]
-i testsrc=size=720x576:rate=25: asks for the testsrc filter pattern as input. Adjusting the size and rate options allow you to choose a specific frame size and framerate. [more]
-c:v v210: transcodes video from rawvideo to 10-bit Uncompressed YUV 4:2:2. Alter this setting to set your desired codec.
-t 10: specifies recording time of 10 seconds
output_file: path, name and extension of the output file. Try different file extensions such as mkv, mov, mp4, or avi.

Play HD SMPTE bars

Test an HD video projector by playing the SMPTE colour bars pattern.

ffplay -f lavfi -i smptehdbars=size=1920x1080

ffplay: starts the command
-f lavfi: tells ffmpeg to use the libavfilter input virtual device [more]
-i smptehdbars=size=1920x1080: asks for the smptehdbars filter pattern as input and sets the HD resolution. This generates a colour bars pattern, based on the SMPTE RP 219–2002. [more]

Play VGA SMPTE bars

Test a VGA (SD) video projector by playing the SMPTE colour bars pattern.

ffplay -f lavfi -i smptebars=size=640x480

ffplay: starts the command
-f lavfi: tells ffmpeg to use the libavfilter input virtual device [more]
-i smptebars=size=640x480: asks for the smptehdbars filter pattern as input and sets the VGA (SD) resolution. This generates a colour bars pattern, based on the SMPTE Engineering Guideline EG 1–1990. [more]

Other

Join files together

ffmpeg -f concat -i mylist.txt -c copy output_file

This command takes two or more files of the same file type and joins them together to make a single file. All that the program needs is a text file with a list specifying the files that should be joined. However, it only works properly if the files to be combined have the exact same codec and technical specifications. Be careful, ffmpeg may appear to have successfully joined two video files with different codecs, but may only bring over the audio from the second file or have other weird behaviors. Don’t use this command for joining files with different codecs and technical specs and always preview your resulting video file!

ffmpeg

starts the command

-f concat

forces ffmpeg to concatenate the files and to keep the same file format

-i mylist.txt

path, name and extension of the input file. Per the ffmpeg documentation, it is preferable to specify relative rather than absolute file paths, as allowing absolute file paths may pose a security risk.
This text file contains the list of files to be concatenated and should be formatted as follows:

file './first_file.ext'
file './second_file.ext'
. . .
file './last_file.ext'

In the above, file is simply the word "file".
Note: If specifying absolute file paths in the .txt file, add -safe 0 before the input file.
e.g.: ffmpeg -f concat -safe 0 -i mylist.txt -c copy output_file

-c copy

use stream copy mode to re-mux instead of re-encode

output_file

path, name and extension of the output file

For more information, see the ffmpeg wiki page on concatenating files.

Play an image sequence

Play an image sequence directly as moving images, without having to create a video first.

ffplay -framerate 5 input_file_%06d.ext

ffplay: starts the command
-framerate 5: plays image sequence at rate of 5 images per second
Note: this low framerate will produce a slideshow effect.
-i input_file: path, name and extension of the input file
This must match the naming convention used! The regex %06d matches six-digit-long numbers, possibly with leading zeroes. This allows the full sequence to be read in ascending order, one image after the other.
The extension for TIFF files is .tif or maybe .tiff; the extension for DPX files is .dpx (or even .cin for old files). Screenshots are often in .png format.

Notes:

If -framerate is omitted, the playback speed depends on the images’ file sizes and on the computer’s processing power. It may be rather slow for large image files.

You can navigate durationally by clicking within the playback window. Clicking towards the left-hand side of the playback window takes you towards the beginning of the playback sequence; clicking towards the right takes you towards the end of the sequence.

Split audio and video tracks

ffmpeg -i input_file -map 0:v video_output_file -map 0:a audio_output_file

This command splits the original input file into a video and audio stream. The -map command identifies which streams are mapped to which file. To ensure that you’re mapping the right streams to the right file, run ffprobe before writing the script to identify which streams are desired.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-map 0:v:0: grabs the first video stream and maps it into:
video_output_file: path, name and extension of the video output file
-map 0:a:0: grabs the first audio stream and maps it into:
audio_output_file: path, name and extension of the audio output file

Combine audio tracks into one in a video file

ffmpeg -i input_file -filter_complex "[0:a:0][0:a:1]amerge[out]" -map 0:v -map "[out]" -c:v copy -shortest output_file

This command combines two audio tracks present in a video file into one stream. It can be useful in situations where a downstream process, like YouTube’s automatic captioning, expect one audio track. To ensure that you’re mapping the right audio tracks run ffprobe before writing the script to identify which tracks are desired. More than two audio streams can be combined by extending the pattern present in the -filter_complex option.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-filter_complex [0:a:0][0:a:1]amerge[out]: combines the two audio tracks into one
-map 0:v: map the video
-map "[out]": map the combined audio defined by the filter
-c:v copy: copy the video
-shortest: limit to the shortest stream
video_output_file: path, name and extension of the video output file

Extract audio from an AV file

ffmpeg -i input_file -c:a copy -vn output_file

This command extracts the audio stream without loss from an audiovisual file.

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-c:a copy: re-encodes using the same audio codec
-vn: no video stream
output_file: path, name and extension of the output file

Flip the video image horizontally and/or vertically

ffmpeg -i input_file -filter:v "hflip,vflip" -c:a copy output_file

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-filter:v "hflip,vflip": flips the image horizontally and vertically
By using only one of the parameters hflip or vflip for filtering the image is flipped on that axis only. The quote marks are not mandatory.
-c:a copy: re-encodes using the same audio codec
For silent videos you can replace -c:a copy by -an.
output_file: path, name and extension of the output file

Modify image and sound speed

E.g. for converting 24fps to 25fps with audio pitch compensation for PAL access copies. (Thanks @kieranjol!)

ffmpeg -i input_file -filter_complex "[0:v]setpts=input_fps/output_fps*PTS[v]; [0:a]atempo=output_fps/input_fps[a]" -map "[v]" -map "[a]" output_file

ffmpeg

starts the command

-i input_file

path, name and extension of the input file

-filter_complex "[0:v]setpts=input_fps/output_fps*PTS[v]; [0:a]atempo=output_fps/input_fps[a]"

A complex filter is needed here, in order to handle video stream and the audio stream separately. The setpts video filter modifies the PTS (presentation time stamp) of the video stream, and the atempo audio filter modifies the speed of the audio stream while keeping the same sound pitch. Note that the parameter’s order for the image and for the sound are inverted:

In the video filter setpts the numerator input_fps sets the input speed and the denominator output_fps sets the output speed; both values are given in frames per second.
In the sound filter atempo the numerator output_fps sets the output speed and the denominator input_fps sets the input speed; both values are given in frames per second.

The different filters in a complex filter can be divided either by comma or semicolon. The quotation marks allow to insert a space between the filters for readability.

-map "[v]"

maps the video stream and:

-map "[a]"

maps the audio stream together into:

output_file

path, name and extension of the output file

Create centered, transparent text watermark

E.g For creating access copies with your institutions name

ffmpeg -i input_file -vf drawtext="fontfile=font_path:fontsize=font_size:text=watermark_text:fontcolor=font_colour:alpha=0.4:x=(w-text_w)/2:y=(h-text_h)/2" output_file

ffmpeg

starts the command

-i input_file

path, name and extension of the input file

-vf drawtext=

This calls the drawtext filter with the following options:

fontfile=font_path: Set path to font. For example in OSX: fontfile=/Library/Fonts/AppleGothic.ttf
fontsize=font_size: Set font size. 35 is a good starting point for SD. Ideally this value is proportional to video size, for example use ffprobe to acquire video height and divide by 14.
text=watermark_text: Set the content of your watermark text. For example: text='FFMPROVISR EXAMPLE TEXT'
fontcolor=font_colour: Set colour of font. Can be a text string such as fontcolor=white or a hexadecimal value such as fontcolor=0xFFFFFF
alpha=0.4: Set transparency value.
x=(w-text_w)/2:y=(h-text_h)/2: Sets x and y coordinates for the watermark. These relative values will centre your watermark regardless of video dimensions.

Note: -vf is a shortcut for -filter:v.

output_file

path, name and extension of the output file.

Create a burnt in timecode on your image

ffmpeg -i input_file -vf drawtext="fontfile=font_path:fontsize=font_size:timecode=starting_timecode:fontcolor=font_colour:box=1 :boxcolor=box_colour:rate=timecode_rate:x=(w-text_w)/2:y=h/1.2" output_file

ffmpeg

starts the command

-i input_file

path, name and extension of the input file

-vf drawtext=

This calls the drawtext filter with the following options:

fontfile=font_path: Set path to font. For example in OSX: fontfile=/Library/Fonts/AppleGothic.ttf
fontsize=font_size: Set font size. 35 is a good starting point for SD. Ideally this value is proportional to video size, for example use ffprobe to acquire video height and divide by 14.
timecode=starting_timecode: Set the timecode to be displayed for the first frame. Timecode is to be represented as hh:mm:ss[:;.]ff. Colon escaping is determined by O.S, for example in Ubuntu timecode='09\\:50\\:01\\:23'. Ideally, this value would be generated from the file itself using ffprobe.
fontcolor=font_colour: Set colour of font. Can be a text string such as fontcolor=white or a hexadecimal value such as fontcolor=0xFFFFFF
box=1: Enable box around timecode
boxcolor=box_colour: Set colour of box. Can be a text string such as fontcolor=black or a hexadecimal value such as fontcolor=0x000000
rate=timecode_rate: Framerate of video. For example 25/1
x=(w-text_w)/2:y=h/1.2: Sets x and y coordinates for the timecode. These relative values will horizontally centre your timecode in the bottom third regardless of video dimensions.

Note: -vf is a shortcut for -filter:v.

output_file

path, name and extension of the output file.

Transcode an image sequence into uncompressed 10-bit video

ffmpeg -f image2 -framerate 24 -i input_file_%06d.ext -c:v v210 -an output_file

ffmpeg: starts the command
-f image2: forces the image file de-muxer for single image files
-framerate 24: Sets the input framerate to 24 fps. The image2 demuxer defaults to 25 fps.
-i input_file: path, name and extension of the input file
This must match the naming convention actually used! The regex %06d matches six digits long numbers, possibly with leading zeroes. This allows to read in ascending order, one image after the other, the full sequence inside one folder. For image sequences starting with 086400 (i.e. captured with a timecode starting at 01:00:00:00 and at 24 fps), add the flag -start_number 086400 before -i input_file_%06d.ext. The extension for TIFF files is .tif or maybe .tiff; the extension for DPX files is .dpx (or eventually .cin for old files).
-c:v v210: encodes an uncompressed 10-bit video stream
-an copy: no audio
output_file: path, name and extension of the output file

Create a video from an image and audio file.

ffmpeg -r 1 -loop 1 -i image_file -i audio_file -acodec copy -shortest -vf scale=1280:720 output_file

This command will take an image file (e.g. image.jpg) and an audio file (e.g. audio.mp3) and combine them into a video file that contains the audio track with the image used as the video. It can be useful in a situation where you might want to upload an audio file to a platform like YouTube. You may want to adjust the scaling with -vf to suit your needs.

ffmpeg: starts the command
-r 1: set the framerate
-loop 1: loop the first input stream
-i image_file: path, name and extension of the image file
-i audio_file: path, name and extension of the audio file
-acodec copy: copy the audio. -acodec is an alias for -c:a
-shortest: finish encoding when the shortest input stream ends
-vf scale=1280:720: filter the video to scale it to 1280x720 for YouTube. -vf is an alias for -filter:v
video_output_file: path, name and extension of the video output file

Change field order of an interlaced video

ffmpeg -i input_file -c:v prores -filter:v setfield=tff output_file

ffmpeg: starts the command
-i input_file: path, name and extension of the input file
-filter:v setfield=tff: Sets the field order to top field first. Use setfield=bff for bottom field first.
-c:v prores: Tells ffmpeg to transcode the video stream into Apple ProRes 422. Experiment with using other codecs.
output_file: path, name and extension of the output file

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