Re: [Mlt-devel] Audio playback at different speed to video frames

[Dan D. <da...@de...>]

On Tue, Mar 12, 2013 at 8:56 AM, s v Satyanarayana <s....@gm...> wrote:
> Hello everyone,
>
> When I try to encode a video at 24fps on mlt 0.8.8, in the resultant video,
> audio plays faster than video frames so that audio does not synchronize
> well with video and audio completes playback 2-3 minutes earlier than video.
>
> Here is the melt command
>  melt original.mp4 -consumer avformat:result_audio_faster.mp4
> frame_rate_num=24 frame_rate_den=1 vb=1000k ab=128k vprofile=baseline g=24
>
> melt version 0.8.8
> Original video contains 25fps and tried encoded video at 24fps.
>
> Original video link: https://www.dropbox.com/s/ytg7lnudabg4p2l/original.mp4
> Resultant video link:
> https://www.dropbox.com/s/f9u6rgtkd3v5hji/result_audio_faster.mp4
>
> Can any one help me so that audio gets synchronized well with video?
>

I was not able to reproduce the problem. There might be a problem your
build or something with your version of libavformat/codec. Or,
possibly, you do not have the resample plugin. Look for
libmltresample.so where your mlt plugins are located, e.g.
$prefix/lib/mlt. This plugin requires that you configure MLT with
--enable-gpl or --enable-gpl3 to make a GPL build of MLT. The fallback
FFmpeg-based audio resampler in MLT is LGPL, but it is only compatible
with libavcodec version < 54.26.0. IOW, at the moment we do not have a
LGPL audio resampler for cutting edge versions of FFmpeg or Libav.
These projects have diverged with respect to the libs. I may revisit
this soon as I have other work to do in this module.

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+-DRD-+