[FFmpeg-user] Remux doubts

[Austin Einter]

Can somebody pls clarify.., I observed the remuxed file is less by 17 bytes.

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
>
>
>
>