[FFmpeg-user] CodecPrivateData is empty when h264_vaapi encoder used

[w_boba]

I am trying to use new CPU with VA-API enabled h264 encoder on FFmpeg (ffmpeg
version n3.2.4-4-g36fff6c).

I have no issues encoding "offline" files with h264_vaapi encoder, but when
I try to encode live streams and push output to SmoothStream server (using
ISMV muxer) new streams do not work. 

Exactly same configuration works fine with libx264 encoder.

So far I figured that after libx264 encoder ffmpeg correctly sets
"CodecPrivateData" field data but h264_vaapi sends empty data field.

Old command line (works fine):
ffmpeg -y -i "udp://235.1.1.136:392" -g 30 -r ntsc -movflags
isml+frag_keyframe -sc_threshold 0 -c:v libx264 -c:a aac -ac 2 -b:a 128k
-b:v 3072k -f ismv "http://10.100.1.14/testenc1.isml/Streams(testenc1)"

New command line (encoding works, but streams do not play):
ffmpeg -y -vaapi_device /dev/dri/renderD128 -i "udp://235.1.1.136:392" -vf
'format=nv12,hwupload' -g 30 -r ntsc -movflags isml+frag_keyframe
-sc_threshold 0 -c:v h264_vaapi -c:a aac -ac 2 -b:a 128k -b:v 3072k -f ismv
"http://10.100.1.14/testenc1.isml/Streams(testenc1)"




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