[FFmpeg-devel] ffmpeg-qsv: Is opaque memory allocation path used in ffmpeg-qsv?

[Rogozhkin, Dmitry V]

On Thu, 2019-10-24 at 17:12 +0200, Max Dmitrichenko wrote:
> Hi,
> 
> Just have a look at any usage as: ffmpeg -hwaccel qsv .......

I looked into these 3 command lines on Linux:

ffmpeg -hwaccel qsv -c:v h264_qsv -i AUD_MW_E.264  \
       -vf hwdownload,format=nv12 -pix_fmt yuv420p \
       AUD_MW.yuv

ffmpeg -hwaccel qsv -c:v h264_qsv -i AUD_MW_E.264 \
       -c:v hevc_qsv -b:v 5M AUD_MW_E.hevc

ffmpeg -init_hw_device qsv=hw     \
       -filter_hw_device hw -f rawvideo -pix_fmt  \
       yuv420p -s:v 176x144 -i AUD_MW.yuv -vf     \
       hwupload=extra_hw_frames=64,format=qsv     \
       -c:v h264_qsv -b:v 5M -frames:v 10         \
       -y ./AUD_MW_E.h264

For what I see, none of the them is using QSV opaque memory. For the
first 2 command lines ffmpeg explicitly prints (w/ -loglevel debug):

[h264_qsv @ 0x34f6980] Decoder: output is video memory surface

Besides, I checked w/ manual printfs from the code - opaque is not
used.

Hence, this question: is actually qsv opaque memory path used anywhere
in ffmpeg.exe sample or in other libavcodec/libavfilter based
applications? Is there Linux/Windows difference which I don't notice in
code review?

Dmitry.

> 
> any 3rd_party implementation can use it by requesting AV_PIX_FMT_QSV
> 
> regards
> Max
> 
> On Thu, Oct 24, 2019 at 12:47 AM Rogozhkin, Dmitry V <
> dmitry.v.rogozhkin at intel.com> wrote:
> 
> > Hi,
> > 
> > I was looking into the ffmpeg qsv (mediasdk hw acceleration) path
> > implementation and wonder whether opaque memory allocation path is
> > actually used and exercised?
> > 
> > I failed to come across any code in ffmpeg sources which use it. Do
> > I
> > miss something?
> > 
> > Are there any other usages possible? For example, can it be used in
> > self-written applications somehow?
> > 
> > Thank you,
> > Dmitry.
> > 
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