[FFmpeg-user] A/V sync issues & more with MediaPortal recording of ClearQAM

Mr M redpenguinmail at gmail.com
Thu Feb 6 20:40:43 CET 2014

On Thu, Feb 6, 2014 at 2:28 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Mr M <redpenguinmail <at> gmail.com> writes:
> > > Could you confirm that this is a DVB recording, not
> > > something put together by (possibly broken) software?
> > For the software, it was only recorded with MediaPortal in ClearQAM,
> > nothing changing since then.
> (I wonder if this software - that I don't know - alters
> the stream in any way.)
> The problem is not video (size changes are nothing
> unusual although FFmpeg will fix the output video
> size to one constant size) but the audio:
> Audio streams are switching between silent and
> non-silent, and I have no idea how (and if) this
> is signaled.
> Carl Eugen
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> ffmpeg-user at ffmpeg.org
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Well I can definitely tell you one thing. The second audio track (spa) is
definitely silent even on the TV as I hear nothing when switching to it.

The other channels ffmpeg works great with, do not actually have spanish
audio in this "spa" tracks, but at least are not silent and have English in

Not sure if this info can help you in anyway, but only other thing I can
think of off-hand.

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