Hello i am interested in doing hardware accelerated decoding for my
ffmpeg based multimedia program using VA API .... i am kind of a
beginner and does not understand very well as how VAAPI interacts with
ffmpeg libraries .... what i have seen from the source code of ffmpeg is
that some parts of VAAPI (decoding parts) are already implemented inside
ffmpeg source code (libavcodec/vaapi.c and others) ......
what i am confused is as how should i activate the VAAPI acceleration
while processing my video via libav* libraries .
filling up vaapi_context as suggested in api documentation and then
putting vaapi_context into AVCodecContext::hwaccel_context does nothing
... and AVCodecContext::hwaccel is also empty ....
as what i have observed from the source code is that libav* libraries
set hwaccel after it recognizes the hardware accelerated decoder using
ff_find_hwaccel
<libavcodec_2internal_8h.html#a2168f59dcf72bc6ddd10cddc2ff0b966>()
inside setup_hwaccel_for_pixfmt
<mpeg12dec_8c.html#a5340d7538dc153223eb4fed064c19423>() function.
ff_find_hwaccel() compares both codec id and pixelformat to detect which
hardware accelerator to load ... ff_find_hwaccel() searches for codec id
and pixelfromat described in AVCodecContext to find out what harware
accelerator to use . in case for mpeg2 codec ff_find_hwaccel() searches
for codec id of mpeg2 and pixelformat " /PIX_FMT_VAAPI_VLD" /inside
AVCodecContext . ff_find_hwaccel() is successful in finding the mpeg2
codec id inside AVCodecContext structure returned from AVFormatContext
but it fails to find the "PIX_FMT_VAAPI_VLD" and does not activate the
hardware acceleration ....
what i need to know is what should i do to activate the VAAPI hardware
acceleration , a simple example would be helpful , and please also don't
prescribe me to see splited deskop examples
or look at the code of VLC play and MPlayer .
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