Hi Ivan, On Mon, Aug 3, 2015 at 4:50 PM, Ivan Uskov <ivan.us...@nablet.com> wrote:
> Hello Ronald, > > Monday, August 3, 2015, 11:37:22 PM, you wrote: > > RSB> On Mon, Aug 3, 2015 at 3:25 PM, Ivan Uskov <ivan.us...@nablet.com> > wrote: > > >> By the way, about old implementation which "worked fine". > >> It just did drop all buffered frames at decoder re-init on new > >> sequence header, there is nice comment inside old qsvdec_h264.c: > >> /* TODO: flush delayed frames on reinit */ > > > RSB> Each AVCodec has a flush function which should do this. So as you > RSB> suggested, you need a flushing state which means you will output "old" > RSB> frames while consuming new frames and caching them internally in some > way. > RSB> Then, when the decoder is flushed (either because flush was called, or > RSB> because all old cached frames have been returned), you can use all > queued > RSB> packets to reinit the hw and start outputing frames right away. > Thank you for suggestion but unfortunately AVCodec::flush is useless > for this issue. The AVCodec::flush intended to *drop* decoded frames > and reset decoder before seeking and it calls by module outside of decoder. > My task is keep all frames without losing and decoder initiates > "flushing" by itself. So it is different kind of "flush". That's exactly what I said, I think you misunderstood. Libav's decoder handles AVCodec.flush inside the size-change function. What I'm saying is to make it a state machine and move that code to AVCodec.flush (if it's not there already), and otherwise (as part of your state machine) buffer incoming patches after a size change until all previous-sized packets have been processed. Then, N new-sized frames later, you'll have N packets buffered, you can input them into the decoder all at once and immediately start outputing frames of the new size without additional delay except for the hw reinit. Ronald _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
