Comment # 9
on bug 98005
from Andy Furniss
The transcoding test above now makes similar size to cbr. There is a new issue though. The GOP patch (2) is problematic. It doesn't show on the transcoding test, but after reading the patch comment about gop affecting rate control I tested with gstreamer default (30) and max = keyframe-period=300 With vbr plus high bitrates this makes a large difference in file size. This still happens if I disable dual instance in radeon_vce.c. CBR seems to be unaffected, though dual instance encoding seems to come out a bit lower than single instance. The vbr test = gst-launch-1.0 -f filesrc location=/mnt/ramdisk/trees-1440p50.nv12 blocksize=5529600 ! video/x-raw,format=NV12,width=2560,height=1440,framerate=50/1 ! queue ! vaapih264enc rate-control=vbr bitrate=50000 keyframe-period=300 ! video/x-h264, profile="" ! filesink location=/mnt/ramdisk/out.264 Result = 9.4M file (source is 500 frames) above with keyframe-period=30 = 42M which is close to expected result.
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