Example
@@ -561,7 +561,7 @@ For example, to convert from Rec.601 to Rec.709, you would use-vf colormatrix=bt601:bt709.
Note: Converting between colourspaces with ffmpeg can be done via either the colormatrix or colorspace filters, with colorspace allowing finer control (individual setting of colourspace, transfer characteristics, primaries, range, pixel format, etc). See this entry on the ffmpeg wiki, and the ffmpeg documentation for colormatrix and colorspace.
+Note: Converting between colourspaces with ffmpeg can be done via either the colormatrix or colorspace filters, with colorspace allowing finer control (individual setting of colourspace, transfer characteristics, primaries, range, pixel format, etc). See this entry on the ffmpeg wiki, and the ffmpeg documentation for colormatrix and colorspace.
Convert colourspace and embed colourspace metadata
ffmpeg -i input_file -c:v libx264 -vf colormatrix=src:dst -color_primaries val -color_trc val -colorspace val output_file
⚠ Using this command it is possible to add Rec.709 tags to a file that is actually Rec.601 (etc), so apply with caution!
These commands are relevant for H.264 and H.265 videos, encoded with libx264 and libx265 respectively.
Note: If you wish to embed colourspace metadata without changing to another colourspace, omit -vf colormatrix=src:dst. However, since it is libx264/libx265 that writes the metadata, it’s not possible to add these tags without reencoding the video stream.
Note: If you wish to embed colourspace metadata without changing to another colourspace, omit -vf colormatrix=src:dst. However, since it is libx264/libx265 that writes the metadata, it’s not possible to add these tags without reencoding the video stream.
For all possible values for -color_primaries, -color_trc, and -colorspace, see the ffmpeg documentation on codec options.
1. Out of step with the regular pattern, -color_trc doesn’t accept bt470bg; it is instead here referred to directly as gamma.
@@ -679,7 +679,7 @@
ffplay -f lavfi "amovie='input.mp3', astats=metadata=1:reset=1, adrawgraph=lavfi.astats.Overall.Peak_level:max=0:min=-30.0:size=700x256:bg=Black[out]"
- ffplay
- starts the command -
- -f lavfi
- tells ffmpeg to use the Libavfilter input virtual device +
- -f lavfi
- tells ffplay to use the Libavfilter input virtual device
- "
- quotation mark to start the lavfi filtergraph
- movie='input.mp3'
- declares audio source file on which to apply filter
- ,
- comma signifies the end of audio source section and the beginning of the filter section @@ -713,7 +713,7 @@
- ffplay
- starts the command -
- -f lavfi
- tells ffmpeg to use the Libavfilter input virtual device +
- -f lavfi
- tells ffplay to use the Libavfilter input virtual device
- "
- quotation mark to start the lavfi filtergraph
- movie='input.mp4'
- declares video file source to apply filter
- ,
- comma signifies closing of video source assertion and ready for filter assertion @@ -775,7 +775,7 @@
- ffprobe
- starts the command
- -show_entries
- sets a list of entries to show
- frame_tags=lavfi.ocr.text
- shows the lavfi.ocr.text tag in the frame section of the video -
- -f lavfi
- tells ffmpeg to use the Libavfilter input virtual device +
- -f lavfi
- tells ffprobe to use the Libavfilter input virtual device
- -i "movie=input_file,ocr"
- declares 'movie' as input_file and passes in the 'ocr' command
- -to 00:55:00
- sets out point at 00:55:00
- -c copy
- use stream copy mode (no re-encoding)
- -map 0
- Tells ffmpeg to map all streams of the input to the output. - Note: watch out when using
- output_file
- path, name and extension of the output file
ffplay -f lavfi "movie='input.mp4', signalstats=out=brng:color=cyan[out]"
-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.
+ 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.
Variation: trim video by setting duration, by using -t instead of -to
Note: the shell script (.sh file) and all .mxf files to be processed must be contained within the same directory, and the script must be run from that directory.
+
Note: the shell script (.sh file) and all .mxf files to be processed must be contained within the same directory, and the script must be run from that directory.
Execute the .sh file with the command sh Rewrap-MXF.sh.
Modify the script as needed to perform different transcodes, or to use with ffprobe. :)
The basic pattern will look similar to this:
@@ -1317,13 +1317,13 @@ foreach ($file in $inputfiles) {
- Note: To call ffmpeg here as just ‘ffmpeg’ (rather than entering the full path to ffmpeg.exe), you must make sure that it’s correctly configured. See this article, especially the section ‘Add to Path’.
$output variable declared above: i.e., the current file name with an .mkv extension.Note: the PowerShell script (.ps1 file) and all .mp4 files to be rewrapped must be contained within the same directory, and the script must be run from that directory.
+
Note: the PowerShell script (.ps1 file) and all .mp4 files to be rewrapped must be contained within the same directory, and the script must be run from that directory.
Execute the .ps1 file by typing .\rewrap-mp4.ps1 in PowerShell.
Modify the script as needed to perform different transcodes, or to use with ffprobe. :)
@@ -1470,7 +1470,7 @@ foreach ($file in $inputfiles) {This will create an XML report for use in QCTools for a video file with one video track and one audio track. See also the QCTools documentation.
- ffprobe
- starts the command -
- -f lavfi
- tells ffmpeg to use the Libavfilter input virtual device +
- -f lavfi
- tells ffprobe to use the Libavfilter input virtual device
- -i
- input file and parameters
- "movie=input_file:s=v+a[in0][in1], [in0]signalstats=stat=tout+vrep+brng, cropdetect=reset=1:round=1, idet=half_life=1, split[a][b];[a]field=top[a1];[b]field=bottom, split[b1][b2];[a1][b1]psnr[c1];[c1][b2]ssim[out0];[in1]ebur128=metadata=1, astats=metadata=1:reset=1:length=0.4[out1]"
- This very large lump of commands declares the input file and passes in a request for all potential data signal information for a file with one video and one audio track @@ -1500,7 +1500,7 @@ foreach ($file in $inputfiles) {
- ffprobe
- starts the command -
- -f lavfi
- tells ffmpeg to use the Libavfilter input virtual device +
- -f lavfi
- tells ffprobe to use the Libavfilter input virtual device
- -i
- input file and parameters
- "movie=input_file,signalstats=stat=tout+vrep+brng, cropdetect=reset=1:round=1, idet=half_life=1, split[a][b];[a]field=top[a1];[b]field=bottom,split[b1][b2];[a1][b1]psnr[c1];[c1][b2]ssim"
- This very large lump of commands declares the input file and passes in a request for all potential data signal information for a file with one video and one audio track @@ -1634,7 +1634,7 @@ foreach ($file in $inputfiles) {
- ffplay
- starts the command -
- -f lavfi
- tells ffmpeg to use the Libavfilter input virtual device +
- -f lavfi
- tells ffplay to use the Libavfilter input virtual device
- -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.
- ffplay
- starts the command -
- -f lavfi
- tells ffmpeg to use the Libavfilter input virtual device +
- -f lavfi
- tells ffplay to use the Libavfilter input virtual device
- -i smptebars=size=640x480
- asks for the smptebars 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.
- -c copy
- use stream copy mode to re-mux instead of re-encode
- output_file
- path, name and extension of the output file @@ -1849,12 +1849,12 @@ e.g.:
- 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.
+ 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. - quotation mark to end drawtext filter command
- output_file
- path, name and extension of the output file.
This will create an XML report for use in QCTools for a video file with one video track and NO audio track. See also the QCTools documentation.
ffplay -f lavfi -i smptehdbars=size=1920x1080
ffplay -f lavfi -i smptebars=size=640x480
-Note: If specifying absolute file paths in the .txt file, add
-safe 0 before the input 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
ffmpeg -f concat -safe 0 -i mylist.txt -c copy output_file
Notes:
+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.
@@ -2069,7 +2069,7 @@ e.g.:ffmpeg -f concat -safe 0 -i mylist.txt -c copy output_file"Note: -vf is a shortcut for -filter:v.
Note: -vf is a shortcut for -filter:v.