[FFmpeg-user] Remux doubts

[Austin Einter]

Thanks Francois.

I will demux programatically and see if both file contents are same/similar.


But what is surprising me, the remuxed file I can play in Chrome browser
but not in Mozilla.
I can play the remuxed file in avplay as well.

Shall I assume my remuxed file is fine as I am able to play it with avplay
and chrome browser.
Or Shall I assume my remuxed file is corrupted one as I can not play it in
mozilla browser.

Many thanks.
Austin





On Fri, Jul 3, 2015 at 1:29 PM, Francois Visagie <francois.visagie at gmail.com
> wrote:

> > -----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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