vaapih264enc and x264enc usage for encoding MVC / stereo?

[Sreerenj Balachandran]

set "num-views=2" to vaapih264enc

On Thu, Jan 26, 2017 at 6:22 PM, Jérôme Carretero <cJ-gst at zougloub.eu>
wrote:

> Hi,
>
>
> Did not get a reply... is there any documentation available or I should
> dig in the code?
>
>
> Thanks,
>
> --
> cJ
>
>
> On Wed, 28 Dec 2016 17:49:37 -0500
> Jérôme Carretero <cJ-gst at zougloub.eu> wrote:
>
> > Hi Víctor,
> >
> >
> > (adding Jan because I saw
> > https://gstreamer.freedesktop.org/data/events/gstreamer-
> conference/2015/Jan%20Schmidt%20-%20Stereoscopic%203D%20Redux.pdf)
> >
> >
> > Yes, the hardware supports MVC encoding (intel SkyLake).
> > Definitely the fact that the downstream caps weren't used wasn't
> > helping there.
> >
> > After some further Googling based on your hint “MVC encoding is
> > selected is if the number of views in upstream is equal or bigger
> > than 2”, I found in the glstereomix docs the
> > "multiview-mode=side-by-side" which is added at the output of
> > glstereomix.
> >
> >
> > Because I already have mixed video in one of my cases (top-bottom or
> > left-right), so I tried:
> >
> >   ! ... \
> >   ! video/x-raw,format=I420,multiview-mode=side-by-side \
> >   ! vaapih264enc \
> >   ! h264parse ! ...
> >
> > But to no avail.
> >
> >
> > Is the StereoHigh encoder expecting these side-by-side buffers, and
> > I'm missing "metadata", or does it prefer to use separate buffers?
> >
> >
> > To "reproduce" a similar situation:
> >
> > # Get a random SBS video on youtube, I believe it's clearly fair use
> >
> > youtube-dl EgD5_7u2NvQ
> > mv *EgD5_7u2NvQ*.mp4 sbs.mp4
> >
> > # Attempt to recompress using StereoHigh
> >
> > gst-launch-1.0 --verbose --no-fault \
> >  filesrc location=sbs.mp4 \
> >  ! qtdemux name=demux \
> >  demux.audio_0 ! queue ! fakesink \
> >  demux.video_0 \
> >  ! queue name=q_dec\
> >   ! h264parse \
> >   ! avdec_h264 \
> >   ! vaapipostproc \
> >  ! queue name=q_enc \
> >   ! video/x-raw,format=I420,multiview-mode=side-by-side \
> >   ! vaapih264enc \
> >   ! h264parse \
> >   ! mp4mux fragment-duration=1000 \
> >   ! filesink location=test-stereohigh.mp4
> >
> > GST_DEBUG=GST_CAPS:5 gst-launch-1.0 \
> >  filesrc location=test-stereohigh.mp4 ! qtdemux ! h264parse !
> > fakesink \
> >  2>&1 | grep stream-format | head -n 1
> >
> > # video/x-h264, parsed=(boolean)true, stream-format=(string){ avc,
> > avc3, # byte-stream }, alignment=(string){ au, nal }
> >
> >
> > Regards,
> >
>
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>



-- 
Regards,

Sreerenj Balachandran
Intel Open Source Technology Center
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