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2015年2月18日 (水)

Changing fps with ffmpeg

ffmpeg is nice but often we need to figure some hackish way around to do what you want...

I recorded a 30 min long video from webcame which is controlled by opencv (cv2 python binding). The video was created fine but the problem started when I wanted to change the fps of the video.

usually -r option is the way to go. This seems to work when input is either buffer through stdin or image sequence (001.png etc). But when the input is a video file (in my case avi container), r option alone does not seem to work as intended.

First try with vsync (playback is not fixed)

Here are the two tricks I had to do to change the fps.

(1) set vsync option to 3 (drop) to discard the timestamp information in the original file (2) set vframes option to specify the frame number to decode/encode.

With these, the muxer will create a fresh timestamp for the output video. The command looks like this:

ffmpeg -vframes 540000 -y -i input.avi -vsync 3 -r 30 out.avi

30 (min) x 60 (s) x 30 (fps) = 54000 so -vframes option is redundant but was needed for vsynch to work. -y option will just overwrite the output file if it already exists.

The webcame was capturing at 30 fps but the output video was set to 10 fps with -r option to slow it down for easy inspection of fast movements.

I still have a problem with this though. After converting this original video to 30 fps with the above command, I did get a 30 min length video but both VLC and the windows media player will still playback at 10 fps.

This can be actually handy for me, because I can seek the video with the correct time (the video length is not x3 longer than the actual time) but it still plays x3 slower which I wanted. But if I want to recover both the playback speed and timestamp then this is not enough.

Second try with video filter

Hence, the 2nd try here. I found a wiki "How to speed up slow down a video" in the official site, which recommend -filter option.

With -filter_complex, you can re-compute and update the timestamp information. Great! But my ffmpeg executable is old (from 2011) and did not like -filter_complex or -filter option, so I used -vf option (alias to -filter) which somehow worked ok.

ffmpeg -y -i -an input.avi -vf setpts=PTS/3.0 -r 30 out.avi

This sped up the original video x3. For sure, I will forget all these in 2 weeks, hence this blog article.

Could I just copy the video stream and only change the frame rate?

There is this -vcodec copy option to avoid decoding and re-encoding process. It would be nice if I can use this when changing just the frame rate.

To me, frame rate looks like just a metadata, no???? If so, why wouldn't we be able to just modify the metadata without compromising the video quality at all?

Sadly, the answer seems no. According to this post to the mailing list, [FFmpeg-user] Deinterlace and change framerate with -vcodec copy.

|   I would really like to do it
|   with -vcodec copy. Is is possible? If it is, which codecs
|   allow for framerate changes like this? Does h264 support it?

No. To change frame rate you have to decode, throw away 'baseband' 'I'
frames, and re-encode.

After all, the frame rate is part of video frame data that cannot be modified without decoding and re-encoding.

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しろののツイッタータイムライン(凍結中)

  • ツイッターは5つ目も凍結されました。6つ目での復活も不可能。なのでnoteに注力しています。

    と思ったら、イーロン・マスクの買収が公になってアカウントが復活できました。ありがとうマスク。

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