[FFmpeg-devel] FFmpeg 2.1

wm4 nfxjfg at googlemail.com
Mon Sep 9 00:26:34 CEST 2013

On Sun, 8 Sep 2013 20:22:39 +0200
Reimar Döffinger <Reimar.Doeffinger at gmx.de> wrote:

> On Sun, Sep 08, 2013 at 05:34:11PM +0200, Michael Niedermayer wrote:
> > Hi all
> > 
> > the FFmpeg 2.0 release is already 2 month ago so it soon becomes
> > time for another release. My plan is to make the release within the
> > next 4-6 weeks or so
> > If you want something in, dont hesitate to work on getting it in
> I'd like to get VDPAU (using the new API) working properly, can
> someone help out?
> I can't even test it properly unfortunately.
> The issues I know about:
> 1) packed B-frame MPEG-4 videos seem to decode without B-frames.
> Possibly just adding a "s->mb_y = s->mb_height;" to the hwaccel case
> of decode_slice will work.
> Am I correct that mb_y != mb_height at the end of that function should
> only happen in case of errors?
> Either way there is quite a mess, for example vaapi_mpeg4 has this code:
> >    if (avctx->codec->id == AV_CODEC_ID_H263)
> >            s->mb_y = s->mb_height;
> However that means for != AV_CODEC_ID_H263 mb_y will stay 0 _forever_,
> which seems like completely nonsense.
> Could it be that all this was implemented by pure trial and error?
> 2) I have had reports of decode artefact with VC1 which only happen
> with the new decoder code. Unfortunately I couldn't reproduce it so far.
> This might be because I either miss the right sample, or because or
> try running on AMD hardware (which in turn seems to have hardware hangs
> when trying to decode WMV3, but for the moment I assume that is not
> a FFmpeg issue).

3) Some mpeg files fail to decode correctly with the libavformat
demuxer, but work correctly with mplayer's mpeg demuxer. (Trac
ticket #2915.)

Well ok, that got nothing to do with the new vdpau API, just vdpau
in general (and possibly other hwaccels).

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