[FFmpeg-user] Remux doubts

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of Austin Einter
> Sent: 03 July 2015 00:54
> To: ffmpeg-user at ffmpeg.org
> Subject: Re: [FFmpeg-user] Remux doubts
> 
> Can somebody pls clarify.., I observed the remuxed file is less by 17
bytes.

That does not necessarily indicate a problem, but rather more likely the
fact that the new container has slightly different metadata.

You could demux both the original and remuxed files to elementary streams
for more meaningful comparison.

> 
> On Thu, Jul 2, 2015 at 11:04 AM, Austin Einter <austin.einter at gmail.com>
> wrote:
> 
> > Hi All
> > I am new to FFmpeg.
> > But I am really excited to learn more about it.
> >
> > I tried remuxing example as a first step.
> >
> > I have taken remux example available at
> > http://ffmpeg.org/doxygen/trunk/doc_2examples_2remuxing_8c-
> example.html.
> >
> > I compiled andlinked to ffmpeg .so files.
> > Everything went fine.
> >
> > Now I downloaded a webm file (small.webm).
> > It contains vp8 and vorbis frames.
> >
> > I did remux it and output file is remuxed.webm
> >
> > I can play the remuxed webm file.
> >
> > So far so good.
> >
> >
> > ----------------------------------------------------------------------
> > ----------------------------------------
> >
> > Now  I wanted to remux a webm file that contains vp8 and opus frames.
> > I could not get such file in internet.
> >
> > So I converted small.webm file to another file say output.webm that
> > contains vp8 and opus frames using below command.
> >
> > *./ffmpeg -i small.webm -c:v libvpx -c:a libopus -qmin 0 -qmax 20
> > output.webm*
> >
> > I opened output.webm in a mozilla browser and I am able to play it.
> > Looks everything fine here.
> >
> > Then I did remux of output.webm and say resultant file is remuxed.webm.
> >
> > If I try to pay remuxed.webm in mozilla browser, it does not play.
> > It gives an error "Video can't be played because the file is corrupt".
> >
> > Can somebody help me to understand when I remux vp8/vorbis file it
> > works, and when I remux vp8/opus file it does not work using the
> > example at
> http://ffmpeg.org/doxygen/trunk/doc_2examples_2remuxing_8c-
> example.html.
> >
> > I am using ffmpeg 2.7.1 version.
> >
> > Thanks
> > Austin
> >
> >
> >
> >
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