[FFmpeg-devel] libavcodec:questions about function ff_mpeg_ref_picture, crushed when using dxva2 hwaccel.

Wei Gao highgod0401 at gmail.com
Fri Mar 22 10:09:08 CET 2013


2013/3/22 Hendrik Leppkes <h.leppkes at gmail.com>

> On Fri, Mar 22, 2013 at 9:19 AM, Wei Gao <highgod0401 at gmail.com> wrote:
> > 2013/3/22 Hendrik Leppkes <h.leppkes at gmail.com>
> >
> >> On Fri, Mar 22, 2013 at 8:19 AM, Wei Gao <highgod0401 at gmail.com> wrote:
> >> > Hi,
> >> >
> >> > I am merging my dxva2 patch to the latest ffmpeg, and I found that the
> >> h264
> >> > of dxva2 wroks well and others don't (vc1 wmv3 mpeg2), I trace the
> code
> >> and
> >> > found that the function ff_mpeg_ref_picture crushed, happened code is
> as
> >> > follows:
> >> >
> >> > if (src->hwaccel_picture_private) {
> >> >         av_log(NULL,AV_LOG_ERROR,"src->hwaccel_picture_private\n");
> >> >         dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
> >> >         if (!dst->hwaccel_priv_buf)
> >> >             goto fail;
> >> >         dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
> >> >     }
> >> >
> >> > h264 doesn't run in the branch but others do. I comment out these code
> >> and
> >> > other video format run correct.
> >> > I tried two configuerations:
> >> > ./configure --disable-debug --enable-gpl --enable-avfilter
> >> --enable-libx264
> >> > --cpu=i686 --enable-opencl --enable-dxva2 --enable-hwaccels
> >> > ./configure --disable-debug --enable-gpl --enable-avfilter
> >> --enable-libx264
> >> > --enable-pthreads --enable-opencl --enable-dxva2 --enable-hwaccels
> >> >
> >> > they are the same problem.
> >> >
> >> > I don't know why other video format run in the branch and what these
> code
> >> > do?
> >>
> >> h264 does not use this because ff_mpeg_ref_picture is part of
> >> mpegvideo, and is not used by h264 anymore.
> >>
> >> For the record, hwaccel works fine for me, in all codecs.
> >> There have been some issues with it, but i submitted patches to fix
> >> the issues and all of them are in git master now.
> >>
> > Hi,
> > Thanks, do you set any options to your hwaccel environment? because my
> code
> > died when run into that branch. but after I comment of it, the result is
> > correct too. So what the branch implement?
> >
>
> I think your tree is out of date, rebase against latest HEAD, i
> recently fixed an issue that caused a crash in this part of the code.
>
Hi,

Thanks, my tree was updated yesterday. I will update the latest and merge

Best regards

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