Re: [PATCH 1/2] media: coda: Fix reported H264 profile

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Le lundi 20 juillet 2020 à 10:40 +0200, Philipp Zabel a écrit :
> On Fri, 2020-07-17 at 11:56 -0400, Nicolas Dufresne wrote:
> > Le vendredi 17 juillet 2020 à 10:14 +0200, Philipp Zabel a écrit :
> > > On Fri, 2020-07-17 at 00:49 -0300, Ezequiel Garcia wrote:
> > > > From: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>
> > > > 
> > > > The CODA960 manual states that ASO/FMO features of baseline are not
> > > > supported, so for this reason this driver should only report
> > > > constrained baseline support.
> > > 
> > > I know the encoder doesn't support this, but is this also true of the
> > > decoder? The i.MX6DQ Reference Manual explicitly lists H.264/AVC decoder
> > > support for both baseline profile and constrained base line profile.
> > 
> > Hmm, double checking, you are right this is documented in the encoding tools
> > sections, not the decoding. But there is extra buffers that need to be passed
> > for ASO/FMO to work, I greatly doubt you have ever tested it.
> 
> And you are correct, I don't think I use any test streams that have
> ASO/FMO enabled.
> 
> > This is not supported by GStreamer parser, or FFMPEG parsers either.
> > Again, we need to make sure in V2 that encoding and decoding
> > capabilities are well seperated.
> > 
> > As for advertising ASO/FMO, I can leave it there, but be aware I won't be
> > testing it. I can provide you links to streams if you care (they are publicly
> > accessible throught the ITU conformance streams published by the ITU).
> 
> That would be welcome.

https://www.itu.int/net/ITU-T/sigdb/spevideo/VideoForm-s.aspx?val=102002641

Notably, if you download the AVCv1 series, there is at
least FM2_SVA_C.zip that uses FMO (slice groups). I haven't looked them
up, I barely started harnessing it for GStreamer.

You can find the link to everything else here, including HEVC.

https://www.itu.int/net/ITU-T/sigdb/spevideo/Hseries-s.htm

> 
> > But as for GStreamer and FFMPEG, this is not supported anyway.
> 
> Ok, how about changing the commit message to say that this is
> unsupported for the encoder and untested for the decoder because there
> is no userspace support?

Agreed.

> 
> regards
> Philipp

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