On Wed, 15 Feb 2017 05:33:38 +0000 Aman Gupta <ffm...@tmm1.net> wrote:
> On Tue, Feb 14, 2017 at 5:14 PM Aman Gupta <ffm...@tmm1.net> wrote: > > > From: Aman Gupta <a...@tmm1.net> > > > > The videotoolbox hwaccel only receives SLICE and IDR_SLICE NALUs. This > > works fine most of the time, but some streams fail to decode because > > changes in PPS are not propagated to the VT decoder. > > > Perhaps SPS can change mid-stream, and should be passed into the VT decoder > as well? I'm not familiar enough with h264 to know. Yes, it can. In theory, it should work, because a SPS/PPS change (in a slice) will trigger a configuration change and reinit the hwaccel (so ff_videotoolbox_avcc_extradata_create() will be called and update with the new SPS). But there's some partial change-detection, which prevents reconfiguration changes if the sw decoder doesn't need them, so this is imperfect. (Also assumes slices can reference only 1 SPS and 1 PPS, which is probably true.) _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
