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Demuxer with .mkv file gives bit rate of 0 #84

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xavier630 opened this issue Jan 13, 2025 · 1 comment · May be fixed by #86
Open

Demuxer with .mkv file gives bit rate of 0 #84

xavier630 opened this issue Jan 13, 2025 · 1 comment · May be fixed by #86

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@xavier630
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xavier630 commented Jan 13, 2025 •
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Hey team,

I'm using the DemuxerWithStreamInfo and finding that the streams with video encoding for various mkv files always have a bit rate of 0.

This doesn't happen for .mov or .mp4 files, they return actual bit rates.

If I run ffmpeg or ffprobe commands on the .mkv files that I have, I get non-zero numbers for the bit rates. That is, these commands give actual bit rates:
ffprobe -v error -show_format -show_streams file.mkv | grep bit_rate
ffmpeg -i file.mkv 2>&1 | grep "bitrate"

Is this expected? If demuxing .mkv files works fine for others, perhaps we could add a .mkv example to the demuxer examples in the library to show the right way to handle .mkv files?
@xavier630 xavier630 changed the title Demuxer with .mkv file gives bitrate of 0 Demuxer with .mkv file gives bit_rate of 0 Jan 13, 2025
@xavier630 xavier630 changed the title Demuxer with .mkv file gives bit_rate of 0 Demuxer with .mkv file gives bit rate of 0 Jan 13, 2025
@operutka
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Hi. This crate is just a wrapper over the FFmpeg libs. If you get 0 bitrate in audio/video codec parameters from the demuxer, it means that the underlying FFmpeg libs return codec parameters with this value. I suggest discussing this with FFmpeg developers.

I'm not sure what exactly the ffprobe and ffmpeg apps do to display the bitrate. They may do additional bitrate estimation if there's 0 bitrate in the codec parameters.

@cht42 cht42 linked a pull request Jan 22, 2025 that will close this issue
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Add duration and bit_rate from container cht42/rust-ac-ffmpeg
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@operutka @xavier630