[FFmpeg-devel] avcodec/qsvenc Question for Intel QSV low latency

[Natsuki Kai]

Oh sorry, I don't understand how to do well yet...
I'll try again.
Thank you guys.

diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
index 2bc19f5241..7d73c64dca 100644
--- a/libavcodec/qsvenc.c
+++ b/libavcodec/qsvenc.c
@@ -803,7 +803,7 @@ int ff_qsv_enc_init(AVCodecContext *avctx,
QSVEncContext *q)

     q->param.AsyncDepth = q->async_depth;

-    q->async_fifo = av_fifo_alloc((1 + q->async_depth) *
+    q->async_fifo = av_fifo_alloc((q->async_depth) *
                                   (sizeof(AVPacket) +
sizeof(mfxSyncPoint*) + sizeof(mfxBitstream*)));
     if (!q->async_fifo)
         return AVERROR(ENOMEM);



On Mon, Nov 13, 2017 at 1:13 AM, Michael Niedermayer <michael at niedermayer.cc
> wrote:

> On Sun, Nov 12, 2017 at 11:40:57AM +0900, Natsuki Kai wrote:
> > Hello guys,
> >
> > this is my first posting to ffmpeg-devel, and I believe my mail format is
> > correct.
> >
> > I'm using ffmpeg for encoding video in real-time, so low encode delay is
> > needed.
> > Once I call "avcodec_send_frame(avctx, frame)", I'd like to get the
> encoded
> > data from "avcodec_receive_packet(avctx, avpkt)".
> >
> > However I cannot do that in ffmpeg and Intel QSV (qsv),
> > "avcodec_receive_packet()" returns nothing when I input the first frame
> to
> > qsv encoder by calling "avcodec_send_frame()".
> > Of cource, after second frame inputs, qsv encoder returns valid data.
> > I'd like to get a valid data from first calling.
> >
> > I've tried some cases and as a result, my requirement is satisfied when
> > avcodec/qsvenc.c will be fixed like below diff info.
> > Then I have a question.
> > Why q->async_fifo is set to be q->async_depth "+ 1"?
> > Anybody knows?
> >
> > --- a/avcodec/qsvenc.c
> > +++ b/avcodec/qsvenc.c
> > @@ -803,7 +803,7 @@
> >
> >      q->param.AsyncDepth = q->async_depth;
> >
> > -    q->async_fifo = av_fifo_alloc((1 + q->async_depth) *
> > +    q->async_fifo = av_fifo_alloc((q->async_depth) *
> >                                    (sizeof(AVPacket) +
> > sizeof(mfxSyncPoint*) + sizeof(mfxBitstream*)));
> >      if (!q->async_fifo)
> >          return AVERROR(ENOMEM);
>
> This looks corrupted by a newline
>
> Applying: avcodec/qsvenc Question for Intel QSV low latency
> error: corrupt patch at line 10
>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Those who are best at talking, realize last or never when they are wrong.
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
>