How to extract keyframe and p-frame from stream with single command using ffmpeg

ffmpegvideo

I want to extract two kind of frames from a tv stream using ffmpeg at the same time.

My question is how can I get two two I and P frames using one single command?

e.g : command to get all keyframes in ffmpeg :

ffmpeg -i http://my-tv-stream.m3u8 -vf "select=eq(pict_type\,I)" -vsync vfr -qscale:v 2 thumbnails-%02d.jpeg

Best Answer

Use

ffmpeg -i http://my-tv-stream.m3u8 -vf "select='eq(pict_type\,I)+eq(pict_type\,P)'" -vsync vfr -qscale:v 2 thumbnails-%02d.jpeg

To output the frame types separately, use

ffmpeg -i http://my-tv-stream.m3u8 -vf "select='eq(pict_type\,I)" -vsync vfr -qscale:v 2 I-thumbnails-%02d.jpeg
       -vf "select='eq(pict_type\,P)" -vsync vfr -qscale:v 2 P-thumbnails-%02d.jpeg

Related Solutions

Selecting one every n frames from a video using ffmpeg

The image2 muxer defaults to constant frame rate. So if the input is, say, 30 fps, and you select every 10th frame i.e. frames with timestamp 0s, 0.33s, 0.66s.. then ffmpeg will duplicate frames to match the input rate so duplicate 9 frames for every input frame.

Way to avoid that is to set video sync method to passthrough or variable frame rate

e.g.

ffmpeg -i input.mp4 -vf "select=not(mod(n\,10))" -vsync vfr 1_every_10/img_%03d.jpg

This can potentially affect the full extraction if the input is VFR. So, use

ffmpeg -i input.mp4 -vf select -vsync vfr all/img_%03d.jpg

Best Answer

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Selecting one every n frames from a video using ffmpeg

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