[Libav-user] Problem with compressing AAC files with sampling rate 16000

[adev dev]

I will build 2.4 version with patch and write if it helps or not. Thanks!

On 18 September 2014 15:41, Claudio Freire <klaussfreire at gmail.com> wrote:

> On Thu, Sep 18, 2014 at 9:43 AM, adev dev <androiddevmar11 at gmail.com>
> wrote:
> > I am compressing movies from bitmaps and AAC files. Normally AAC files
> are
> > recorded with following params: bit rate: 192000, sampling rate 44100.
> These
> > audio params are set in output context (AVFormatContext) in compression.
> In
> > happy day scenario it is working correctly. Movie and sound are correct.
> >
> > The problem occures if sound params are "strange". From time to time I
> have
> > AAC files recorded with params: bitrate 96000, sampling rate 16000. In
> this
> > case sound is very fast and ends before end of movie. If I set these
> params
> > (96000, 16000) in output context there is no sound in the movie at all.
> > Created movie file has audio stream with bitrate about 500 b/s what is
> > really strange.
> >
> > What else has to be set in FFMPEG to correctly compress AAC files with
> bit
> > rate 96000 and sampling rate 16000?
> >
> > I am using FFMPEG 2.1 and native AAC encoder.
>
>
> If you can build from source, try head after applying the patch in
> here:
> https://trac.ffmpeg.org/attachment/ticket/2686/aac-improvements-wip-v8g.patch
>
> It fixes some issues with some sampling rates, although your issue
> doesn't sound familiar to me, it's worth a try.
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