[libav-tools] Converting video format when audio is out of sync

Sampsa Riikonen sampsa.riikonen at iki.fi
Wed Apr 22 08:29:52 CEST 2015


Hi,

Could the out-of-sync result from dropping out corrupt frames?  ..

To re-encode the video, you could try .. (substituting ffmpeg with 
avconv below should work..):

ffmpeg -i input.mkv -filter_complex "[0:v] fps=25" output.mkv

.. I think that should enforce fixed frame rate and fix the corrupt frames.

Regards,

Sampsa

On 21.04.2015 17:08, Derrell Lipman wrote:
> I have a .mkv file that plays properly using avplay 0.8.17 from Ubuntu 
> (with no specified command-line options), but plays with video/audio 
> out of sync when using any other program I've tried. I have been 
> unsuccessful at finding avconv options that will convert this file to 
> .mp4 with proper video/audio sync. *What are the avconv options that 
> are equivalent to the defaults of avplay?*
>
> The file is an hour-long video, so it would be useful, for testing, to 
> use the -t option to convert only the first N seconds of the video, 
> but that option seems to have no effect.
>
> Your help will be greatly appreciated! Following is the output of 
> avprobe on my .mkv file.
>
>
> avprobe version 0.8.17, Copyright (c) 2007-2014 the Libav developers
>   built on Apr 21 2015 09:23:53 with gcc 4.6.3
> [matroska,webm @ 0x2450760] Estimating duration from bitrate, this may 
> be inaccurate
> Input #0, matroska,webm, from '/tmp/11-00-02.mkv':
>   Metadata:
>     ENCODER         : Lavf55.33.101
>   Duration: 01:13:40.08, start: 0.000000, bitrate: 64 kb/s
>     Stream #0.0: Video: h264 (Baseline), yuvj420p, 1920x1080, PAR 1:1 
> DAR 16:9, 60 fps, 19.92 tbr, 1k tbn, 60 tbc (default)
>     Stream #0.1: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s 
> (default)
>
> Thank you very much,
>
> Derrell
>
>
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