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Style: add spaces in long filtergraphs; only use italics for inputs
In filtergraphs that are reasonably long or unwieldy, I've added a space after each comma for readability. In ffmpeg commands, italics should denote user inputs/outputs. Where italics had been used for 'regular' variables (i.e., not an input/output file or a variable for which the user must explicitly choose the value), I've deleted them. These are stylistic changes that, I think, make things more readable and/or more uniform.
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index.html
@ -156,23 +156,23 @@
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<div class="modal-content">
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<div class="well">
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<h3>H.264 from DCP</h3>
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<p><code>ffmpeg -i <i>input_video_file</i>.mxf -i <i>input_audio_file</i>.mxf -c:v <i>libx264</i> -pix_fmt <i>yuv420p</i> -c:a <i>aac output_file.mp4</i></code></p>
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<p><code>ffmpeg -i <i>input_video_file</i>.mxf -i <i>input_audio_file</i>.mxf -c:v libx264 -pix_fmt yuv420p -c:a aac <i>output_file.mp4</i></code></p>
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<p>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.</p>
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<dl>
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<dt>ffmpeg</dt><dd>starts the command</dd>
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<dt>-i <i>input_video_file</i></dt><dd>path and name of the video input file. This extension must be <code>.mxf</code></dd>
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<dt>-i <i>input_audio_file</i></dt><dd>path and name of the audio input file. This extension must be <code>.mxf</code></dd>
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<dt>-c:v <i>libx264</i></dt><dd>transcodes video to H.264</dd>
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<dt>-pix_fmt <i>yuv420p</i></dt><dd>sets pixel format to yuv420p for greater compatibility with media players</dd>
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<dt>-c:v libx264</dt><dd>transcodes video to H.264</dd>
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<dt>-pix_fmt yuv420p</dt><dd>sets pixel format to yuv420p for greater compatibility with media players</dd>
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<dt>-c:a aac</dt><dd>re-encodes using the AAC audio codec<br>
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Note that sadly MP4 cannot contain sound encoded by a PCM (Pulse-Code Modulation) audio codec</dd>
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<dt><i>output_file.mp4</i></dt><dd>path, name and <i>.mp4</i> extension of the output file</dd>
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<dt><i>output_file.mp4</i></dt><dd>path, name and .mp4 extension of the output file</dd>
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</dl>
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<p>Variation: Copy PCM audio streams by using Matroska instead of the MP4 container</p>
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<p><code>ffmpeg -i <i>input_video_file</i>.mxf -i <i>input_audio_file</i>.mxf -c:v <i>libx264</i> -pix_fmt <i>yuv420p</i> -c:a <i>copy output_file.mkv</i></code></p>
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<p><code>ffmpeg -i <i>input_video_file</i>.mxf -i <i>input_audio_file</i>.mxf -c:v libx264 -pix_fmt yuv420p -c:a copy <i>output_file.mkv</i></code></p>
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<dl>
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<dt>-c:a copy</dt><dd>re-encodes using the same audio codec</dd>
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<dt><i>output_file.mkv</i></dt><dd>path, name and <i>.mkv</i> extension of the output file</dd>
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<dt><i>output_file.mkv</i></dt><dd>path, name and .mkv extension of the output file</dd>
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</dl>
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<p class="link"></p>
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</div>
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@ -188,7 +188,7 @@
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<div class="modal-content">
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<div class="well">
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<h3>Create FFV1 Version 3 video in a Matroska container with framemd5 of input</h3>
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<p><code>ffmpeg -i <i>input_file</i> -map 0 -dn -c:v ffv1 -level 3 -g 1 -slicecrc 1 -slices 16 -c:a copy <i>output_file</i>.mkv -f framemd5 -an <i>md5_output_file</i></code></p>
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<p><code>ffmpeg -i <i>input_file</i> -map 0 -dn -c:v ffv1 -level 3 -g 1 -slicecrc 1 -slices 16 -c:a copy <i>output_file</i>.mkv -f framemd5 -an <i>framemd5_output_file</i></code></p>
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<p>This will losslessly transcode 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, <a href="https://trac.ffmpeg.org/wiki/Encode/FFV1" target="_blank">try the ffmpeg wiki</a>.</p>
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<dl>
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<dt>ffmpeg</dt><dd>starts the command.</dd>
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@ -325,11 +325,11 @@
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<dl>
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<dt>ffmpeg</dt><dd>starts the command</dd>
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<dt>-i <i>input_file</i></dt><dd>path and name of the input file</dd>
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<dt>-write_id3v1 <i>1</i></dt><dd>This will write metadata to an ID3v1 tag at the head of the file, assuming you’ve embedded metadata into the WAV file.</dd>
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<dt>-id3v2_version <i>3</i></dt><dd>This will write metadata to an ID3v2.3 tag at the tail of the file, assuming you’ve embedded metadata into the WAV file.</dd>
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<dt>-dither_method <i>rectangular</i></dt><dd>Dither makes sure you don’t unnecessarily truncate the dynamic range of your audio.</dd>
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<dt>-out_sample_rate <i>48k</i></dt><dd>Sets the audio sampling frequency to 48 kHz. This can be omitted to use the same sampling frequency as the input.</dd>
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<dt>-qscale:a <i>1</i></dt><dd>This sets the encoder to use a constant quality with a variable bitrate of between 190-250kbit/s. If you would prefer to use a constant bitrate, this could be replaced with <code>-b:a 320k</code> to set to the maximum bitrate allowed by the MP3 format. For more detailed discussion on variable vs constant bitrates see <a href="https://trac.ffmpeg.org/wiki/Encode/MP3" target="_blank">here.</a></dd>
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<dt>-write_id3v1 1</dt><dd>This will write metadata to an ID3v1 tag at the head of the file, assuming you’ve embedded metadata into the WAV file.</dd>
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<dt>-id3v2_version 3</dt><dd>This will write metadata to an ID3v2.3 tag at the tail of the file, assuming you’ve embedded metadata into the WAV file.</dd>
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<dt>-dither_method rectangular</dt><dd>Dither makes sure you don’t unnecessarily truncate the dynamic range of your audio.</dd>
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<dt>-out_sample_rate 48k</dt><dd>Sets the audio sampling frequency to 48 kHz. This can be omitted to use the same sampling frequency as the input.</dd>
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<dt>-qscale:a 1</dt><dd>This sets the encoder to use a constant quality with a variable bitrate of between 190-250kbit/s. If you would prefer to use a constant bitrate, this could be replaced with <code>-b:a 320k</code> to set to the maximum bitrate allowed by the MP3 format. For more detailed discussion on variable vs constant bitrates see <a href="https://trac.ffmpeg.org/wiki/Encode/MP3" target="_blank">here.</a></dd>
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<dt><i>output_file</i></dt><dd>path and name of the output file</dd>
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</dl>
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<p>A couple notes</p>
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@ -517,13 +517,13 @@
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<dt>-i <i>input file</i></dt><dd>path, name and extension of the input file</dd>
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<dt>-c:v libx264</dt><dd>tells ffmpeg to encode the video stream as H.264</dd>
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<dt>-vf</dt><dd>video filtering will be used (<code>-vf</code> is an alias of <code>-filter:v</code>)</dd>
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<dt><i>"</i></dt><dd>start of filtergraph (see below)</dd>
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<dt><i>yadif</i></dt><dd>deinterlacing filter (‘yet another deinterlacing filter’)<br>
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<dt>"</dt><dd>start of filtergraph (see below)</dd>
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<dt>yadif</dt><dd>deinterlacing filter (‘yet another deinterlacing filter’)<br>
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By default, <a href="https://ffmpeg.org/ffmpeg-filters.html#yadif-1" target="_blank">yadif</a> will output one frame for each frame. Outputting one frame for each <i>field</i> (thereby doubling the frame rate) with <code>yadif=1</code> may produce visually better results.</dd>
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<dt><i>,</i></dt><dd>separates filters</dd>
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<dt><i>format=yuv420p</i></dt><dd>chroma subsampling set to 4:2:0<br>
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<dt>,</dt><dd>separates filters</dd>
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<dt>format=yuv420p</dt><dd>chroma subsampling set to 4:2:0<br>
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By default, <code>libx264</code> will use a chroma subsampling scheme that is the closest match to that of the input. This can result in Y′C<sub>B</sub>C<sub>R</sub> 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, therefore it’s advisable to specify 4:2:0 chroma subsampling.</dd>
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<dt><i>"</i></dt><dd>end of filtergraph</dd>
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<dt>"</dt><dd>end of filtergraph</dd>
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<dt><i>output file</i></dt><dd>path, name and extension of the output file</dd>
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</dl>
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<p> <code>"yadif,format=yuv420p"</code> is an ffmpeg <a href="https://trac.ffmpeg.org/wiki/FilteringGuide#FiltergraphChainFilterrelationship" target="_blank">filtergraph</a>. Here the filtergraph is made up of one filter chain, which is itself made up of the two filters (separated by the comma).<br>
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@ -871,7 +871,7 @@
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Then the scale filter resizes the image. You can specify both the width and the height, or specify a value for one and use a scale value of <i>-1</i> for the other to preserve the aspect ratio. (For example, <code>500:-1</code> would create a GIF 500 pixels wide and with a height proportional to the original video). In the first script above, <code>:flags=lanczos</code> specifies that the Lanczos rescaling algorithm will be used to resize the image.<br>
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Lastly, the palettegen filter generates the palette.</dd>
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<dt>-t <i>3</i></dt><dd>duration in seconds (here 3; can be specified also with a full timestamp, i.e. here 00:00:03)</dd>
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<dt>-loop <i>6</i></dt><dd>number of times to loop the GIF. A value of <i>-1</i> will disable looping. Omitting <i>-loop</i> will use the default which will loop infinitely</dd>
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<dt>-loop <i>6</i></dt><dd>sets the number of times to loop the GIF. A value of <i>-1</i> will disable looping. Omitting <i>-loop</i> will use the default, which will loop infinitely.</dd>
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<dt><i>output_file</i></dt><dd>path, name and extension of the output file</dd>
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</dl>
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<p>The second command has a slightly different filtergraph, which breaks down as follows:</p>
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@ -975,7 +975,7 @@
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<dt>-to 00:55:00</dt><dd>sets out point at 00:55:00</dd>
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<dt>-c copy</dt><dd>use stream copy mode (no re-encoding)<br>
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<dt>-map 0</dt><dd>Tells ffmpeg to map all streams of the input to the output.</dd>
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<i>Note:</i> watch out when using <code>-ss</code> with <code>-c copy</code> 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.</dd>
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<b>Note</b>: watch out when using <code>-ss</code> with <code>-c copy</code> 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.</dd>
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<dt><i>output_file</i></dt><dd>path, name and extension of the output file</dd>
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</dl>
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<p>Variation: trim video by setting duration, by using <code>-t</code> instead of <code>-to</code></p>
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@ -1047,13 +1047,13 @@
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<div class="well">
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<h3>Create ISO files for DVD access</h3>
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<p>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: <code>brew install dvdauthor</code></p>
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<p><code>ffmpeg -i <i>input_file</i> -aspect <i>4:3</i> -target <i>ntsc-dvd output_file</i>.mpg</code></p>
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<p><code>ffmpeg -i <i>input_file</i> -aspect <i>4:3</i> -target ntsc-dvd <i>output_file</i>.mpg</code></p>
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<p>This command will take any file and create an MPEG file that dvdauthor can use to create an ISO.</p>
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<dl>
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<dt>ffmpeg</dt><dd>starts the command</dd>
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<dt>-i <i>input_file</i></dt><dd>path, name and extension of the input file</dd>
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<dt>-aspect <i>4:3</i></dt><dd>declares the aspect ratio of the resulting video file. You can also use 16:9.</dd>
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<dt>-target <i>ntsc-dvd</i></dt><dd>specifies the region for your DVD. This could be also pal-dvd.</dd>
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<dt>-aspect 4:3</dt><dd>declares the aspect ratio of the resulting video file. You can also use 16:9.</dd>
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<dt>-target ntsc-dvd</dt><dd>specifies the region for your DVD. This could be also pal-dvd.</dd>
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<dt><i>output_file</i>.mpg</dt><dd>path and name of the output file. The extension must be <code>.mpg</code></dd>
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</dl>
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<p class="link"></p>
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@ -1364,7 +1364,7 @@ foreach ($file in $inputfiles) {
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<div class="modal-content">
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<div class="well">
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<h3>Create MD5 checksums (audio samples)</h3>
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<p><code>ffmpeg -i <i>input_file</i> -af "asetnsamples=<i>n=48000</i>" -f framemd5 -vn <i>output_file</i></code></p>
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<p><code>ffmpeg -i <i>input_file</i> -af "asetnsamples=n=48000" -f framemd5 -vn <i>output_file</i></code></p>
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<p>This will create an MD5 checksum for each group of 48000 audio samples.<br>
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The number of samples per group can be set arbitrarily, but it's good practice to match the samplerate of the media file (so you will get one checksum per second).</p>
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<p>Examples for other samplerates:</p>
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@ -1565,7 +1565,7 @@ foreach ($file in $inputfiles) {
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<dt>ffmpeg</dt><dd>starts the command</dd>
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<dt>-f lavfi</dt><dd>tells ffmpeg to use the <a href="http://ffmpeg.org/ffmpeg-devices.html#lavfi" target="_blank">Libavfilter</a> input virtual device</dd>
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<dt>-i mandelbrot=size=1280x720:rate=25</dt><dd>asks for the <a href="https://ffmpeg.org/ffmpeg-filters.html#mandelbrot" target="_blank">mandelbrot test filter</a> as input. Adjusting the <code>size</code> and <code>rate</code> options allows you to choose a specific frame size and framerate.</dd>
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<dt>-c:v <i>libx264</i></dt><dd>transcodes video from rawvideo to H.264. Set <code>-pix_fmt</code> to <code>yuv420p</code> for greater H.264 compatibility with media players.</dd>
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<dt>-c:v libx264</dt><dd>transcodes video from rawvideo to H.264. Set <code>-pix_fmt</code> to <code>yuv420p</code> for greater H.264 compatibility with media players.</dd>
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<dt>-t 10</dt><dd>specifies recording time of 10 seconds</dd>
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<dt><i>output_file</i></dt><dd>path, name and extension of the output file. Try different file extensions such as mkv, mov, mp4, or avi.</dd>
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</dl>
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@ -1588,7 +1588,7 @@ foreach ($file in $inputfiles) {
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<dt>ffmpeg</dt><dd>starts the command</dd>
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<dt>-f lavfi</dt><dd>tells ffmpeg to use the <a href="http://ffmpeg.org/ffmpeg-devices.html#lavfi" target="_blank">Libavfilter</a> input virtual device</dd>
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<dt>-i smptebars=size=720x576:rate=25</dt><dd>asks for the <a href="https://ffmpeg.org/ffmpeg-filters.html#allrgb_002c-allyuv_002c-color_002c-haldclutsrc_002c-nullsrc_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc" target="_blank">smptebars test filter</a> as input. Adjusting the <code>size</code> and <code>rate</code> options allows you to choose a specific frame size and framerate.</dd>
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<dt>-c:v <i>prores</i></dt><dd>transcodes video from rawvideo to Apple ProRes 4:2:2.</dd>
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<dt>-c:v prores</dt><dd>transcodes video from rawvideo to Apple ProRes 4:2:2.</dd>
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<dt>-t 10</dt><dd>specifies recording time of 10 seconds</dd>
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<dt><i>output_file</i></dt><dd>path, name and extension of the output file. Try different file extensions such as mov or avi.</dd>
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</dl>
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@ -1612,7 +1612,7 @@ foreach ($file in $inputfiles) {
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<dt>-f lavfi</dt><dd>tells ffmpeg to use the <a href="http://ffmpeg.org/ffmpeg-devices.html#lavfi" target="_blank">libavfilter</a> input virtual device</dd>
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<dt>-i testsrc=size=720x576:rate=25</dt><dd>asks for the testsrc filter pattern as input. Adjusting the <code>size</code> and <code>rate</code> options allows you to choose a specific frame size and framerate. <br>
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The different test patterns that can be generated are listed <a href="https://ffmpeg.org/ffmpeg-filters.html#allrgb_002c-allyuv_002c-color_002c-haldclutsrc_002c-nullsrc_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc" target="_blank">here</a>.</dd>
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<dt>-c:v <i>v210</i></dt><dd>transcodes video from rawvideo to 10-bit Uncompressed Y′C<sub>B</sub>C<sub>R</sub> 4:2:2. Alter this setting to set your desired codec.</dd>
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<dt>-c:v v210</dt><dd>transcodes video from rawvideo to 10-bit Uncompressed Y′C<sub>B</sub>C<sub>R</sub> 4:2:2. Alter this setting to set your desired codec.</dd>
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<dt>-t 10</dt><dd>specifies recording time of 10 seconds</dd>
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<dt><i>output_file</i></dt><dd>path, name and extension of the output file. Try different file extensions such as mkv, mov, mp4, or avi.</dd>
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</dl>
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@ -1656,7 +1656,7 @@ foreach ($file in $inputfiles) {
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<dl>
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<dt>ffplay</dt><dd>starts the command</dd>
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<dt>-f lavfi</dt><dd>tells ffmpeg to use the <a href="http://ffmpeg.org/ffmpeg-devices.html#lavfi" target="_blank">Libavfilter</a> input virtual device</dd>
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<dt>-i smptebars=size=640x480</dt><dd>asks for the <a href="https://ffmpeg.org/ffmpeg-filters.html#allrgb_002c-allyuv_002c-color_002c-haldclutsrc_002c-nullsrc_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc" target="_blank">smptebars filter pattern</a> as input. and sets the VGA (SD) resolution. This generates a colour bars pattern, based on the SMPTE Engineering Guideline EG 1–1990.</dd>
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<dt>-i smptebars=size=640x480</dt><dd>asks for the <a href="https://ffmpeg.org/ffmpeg-filters.html#allrgb_002c-allyuv_002c-color_002c-haldclutsrc_002c-nullsrc_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc" target="_blank">smptebars filter pattern</a> as input and sets the VGA (SD) resolution. This generates a colour bars pattern, based on the SMPTE Engineering Guideline EG 1–1990.</dd>
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</dl>
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<p class="link"></p>
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</div>
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@ -1728,7 +1728,7 @@ foreach ($file in $inputfiles) {
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<dt>-i "sine=frequency=1000:sample_rate=48000"</dt><dd>Sets the signal to 1000 Hz, sampling at 48 kHz.</dd>
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<dt>-c:a pcm_s16le</dt><dd>encodes the audio codec in <code>pcm_s16le</code> (the default encoding for wav files). pcm represents pulse-code modulation format (raw bytes), <code>16</code> means 16 bits per sample, and <code>le</code> means "little endian"</dd>
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<dt>-t 10</dt><dd>specifies recording time of 10 seconds</dd>
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<dt>-c:v <i>ffv1</i></dt><dd>Encodes to <a href="https://en.wikipedia.org/wiki/FFV1" target="_blank">FFV1</a>. Alter this setting to set your desired codec.</dd>
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<dt>-c:v ffv1</dt><dd>Encodes to <a href="https://en.wikipedia.org/wiki/FFV1" target="_blank">FFV1</a>. Alter this setting to set your desired codec.</dd>
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<dt><i>output_file</i>.wav</dt><dd>path, name and extension of the output file</dd>
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</dl>
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<p class="link"></p>
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@ -1788,7 +1788,7 @@ file '<i>./second_file.ext</i>'
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. . .
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file '<i>./last_file.ext</i>'</pre>
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In the above, <b>file</b> is simply the word "file". Straight apostrophes ('like this') rather than curved quotation marks (‘like this’) must be used to enclose the file paths.<br>
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<i>Note</i>: If specifying absolute file paths in the .txt file, add <code>-safe 0</code> before the input file.<br>
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<b>Note</b>: If specifying absolute file paths in the .txt file, add <code>-safe 0</code> before the input file.<br>
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e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></code></dd>
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<dt>-c copy</dt><dd>use stream copy mode to re-mux instead of re-encode</dd>
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<dt><i>output_file</i></dt><dd>path, name and extension of the output file</dd>
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@ -1849,12 +1849,12 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
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<dl>
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<dt>ffplay</dt><dd>starts the command</dd>
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<dt>-framerate 5</dt><dd>plays image sequence at rate of 5 images per second<br>
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<i>Note</i>: this low framerate will produce a slideshow effect.</dd>
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<b>Note</b>: this low framerate will produce a slideshow effect.</dd>
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<dt>-i <i>input_file</i></dt><dd>path, name and extension of the input file<br>
|
||||
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.<br>
|
||||
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.</dd>
|
||||
</dl>
|
||||
<p><i>Notes:</i></p>
|
||||
<p><b>Notes</b>:</p>
|
||||
<p>If <code>-framerate</code> 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.</p>
|
||||
<p>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.</p>
|
||||
<p class="link"></p>
|
||||
@ -2118,8 +2118,8 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
|
||||
<dt>-i <i>audio_file</i></dt><dd>path, name and extension of the audio file</dd>
|
||||
<dt>-acodec copy</dt><dd>copy the audio. -acodec is an alias for -c:a</dd>
|
||||
<dt>-shortest</dt><dd>finish encoding when the shortest input stream ends</dd>
|
||||
<dt>-vf <i>scale=1280:720</i></dt><dd>filter the video to scale it to 1280x720 for YouTube. -vf is an alias for -filter:v</dd>
|
||||
<dt><i>video_output_file</i></dt><dd>path, name and extension of the video output file</dd>
|
||||
<dt>-vf scale=1280:720</dt><dd>filter the video to scale it to 1280x720 for YouTube. -vf is an alias for -filter:v</dd>
|
||||
<dt><i>output_file</i></dt><dd>path, name and extension of the video output file</dd>
|
||||
</dl>
|
||||
<p class="link"></p>
|
||||
</div>
|
||||
@ -2139,7 +2139,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
|
||||
<dl>
|
||||
<dt>ffmpeg</dt><dd>starts the command</dd>
|
||||
<dt>-i <i>input_file</i></dt><dd>path, name and extension of the input file</dd>
|
||||
<dt>-filter:v <i>setfield=tff</i></dt><dd>Sets the field order to top field first. Use <code>setfield=bff</code> for bottom field first.</dd>
|
||||
<dt>-filter:v setfield=tff</dt><dd>Sets the field order to top field first. Use <code>setfield=bff</code> for bottom field first.</dd>
|
||||
<dt>-c:v <i>video_codec</i></dt><dd>As a video filter is used, it is not possible to use <code>-c copy</code>. The video must be re-encoded with whatever video codec is chosen, e.g. <code>ffv1</code>, <code>v210</code> or <code>prores</code>.</dd>
|
||||
<dt><i>output_file</i></dt><dd>path, name and extension of the output file</dd>
|
||||
</dl>
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user