[FFmpeg-devel] Frame CRC muxer

Bjorn Roche bjorn at shimmeo.com
Tue Sep 26 17:56:35 EEST 2017


On Mon, Sep 25, 2017 at 3:12 PM, James Almer <jamrial at gmail.com> wrote:

> On 9/25/2017 3:49 PM, Bjorn Roche wrote:
> > Hi there,
> >
> > I have a patch for this issue:
> >
> > https://trac.ffmpeg.org/ticket/4443
> >
> > However, when running the automated ("fate") tests, I get the error
> pasted
> > below. I'm not sure what's going on since the output formats look
> different
> > when running a the test vs when I run the same command with my built-in
> > FFmpeg. e.g.:
> >
> > my compiled ffmpeg:
> >
> > 0,          2,          2,        1,      438, 0x4776d352, S=1,     1024,
> > 0xcfc8799f
> >
> >
> > built-in ffmpeg:
> >
> >
> > 0,          2,          2,        1,      438, 0x4776d352, S=2,        1,
> > 0x00010001,     1024, 0xcfc8799f
> >
> >
> > Neither format looks like this:
> > https://ffmpeg.org/ffmpeg-formats.html#framecrc-1. (I don't know what
> the
> > S=X..... means, so I am not sure what it's telling me has changed, if
> > anything.)
>
> The S stands for side data, and the X is the amount of side data
> elements embedded in the packet. Values after that are size and crc
> checksum of each side data element.
>

Ah, excellent, that makes sense. Thanks for your response!

bjorn

-- 
Bjorn Roche
@shimmeoapp


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