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v2019-07-1
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v2019-07-1
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@@ -294,7 +294,7 @@
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<input type="checkbox" id="transcode_h264">
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<div class="hiding">
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<h3>Transcode to H.264</h3>
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<p><code>ffmpeg -i <em>input_file</em> -c:v libx264 -pix_fmt yuv420p -c:a aac -map 0:a <em>output_file</em></code></p>
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<p><code>ffmpeg -i <em>input_file</em> -c:v libx264 -pix_fmt yuv420p -c:a aac <em>output_file</em></code></p>
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<p>This command takes an input file and transcodes it to H.264 with an .mp4 wrapper, audio is transcoded to AAC. 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.</p>
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<dl>
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<dt>ffmpeg</dt><dd>starts the command</dd>
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@@ -303,7 +303,6 @@
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<dt>-pix_fmt yuv420p</dt><dd>libx264 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. In order to allow the video to play in all players, you can specify 4:2:0 chroma subsampling.</dd>
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<dt>-c:a aac</dt><dd>encode audio as AAC.<br>
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AAC is the codec most often used for audio streams within an .mp4 container.</dd>
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<dt>-map 0:a</dt><dd>maps all audio tracks (default is first two)</dd>
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<dt><em>output_file</em></dt><dd>path, name and extension of the output file</dd>
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</dl>
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<p>In order to optimize the file for streaming, you can add this preset:</p>
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@@ -7,7 +7,7 @@ ffmpeg -i input_file -f rawvideo -c:v copy output_file.dv
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# Transcode to deinterlaced Apple ProRes LT
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ffmpeg -i input_file -c:v prores -profile:v 1 -vf yadif -c:a pcm_s16le output_file.mov
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# Transcode to an H.264 access file
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ffmpeg -i input_file -c:v libx264 -pix_fmt yuv420p -c:a aac -map 0:a output_file
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ffmpeg -i input_file -c:v libx264 -pix_fmt yuv420p -c:a aac output_file
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# Transcode from DCP to an H.264 access file
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ffmpeg -i input_video_file.mxf -i input_audio_file.mxf -c:v libx264 -pix_fmt yuv420p -c:a aac output_file.mp4
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# Transcode your file with the FFV1 Version 3 Codec in a Matroska container
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