[FFmpeg-trac] #7268(undetermined:new): ffmpeg-vaapi hevc vbr encode can not control the output bitrate
FFmpeg
trac at avcodec.org
Thu Jun 21 09:46:56 EEST 2018
#7268: ffmpeg-vaapi hevc vbr encode can not control the output bitrate
-------------------------------------+-------------------------------------
Reporter: focusluo | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -v verbose -f
rawvideo -s:v 1920x1080 -i ./1080p_blue_sky.yuv -vf format=nv12,hwupload
-c:v hevc_vaapi -g 12 -bf 0 -b:v 4M -quality 4 -y
./hevce_vbr_1920x1080_gop12_refdist0_bitrate4M.h265
My input is 4M bitrate, but the output is bitrate=3480.3kbits/s, which is
out of the 10% range
some log of output:
[hevc_vaapi @ 0x5654f5b96240] Input 1920x1080 -> Surface 1920x1088 -> CTU
60x34.
Output #0, hevc, to './hevce_vbr_1920x1080_gop12_refdist0_bitrate4M.h265':
Metadata:
encoder : Lavf58.17.100
Stream #0:0: Video: hevc (hevc_vaapi) (Main), 1 reference frame,
vaapi_vld, 1920x1080, q=2-31, 4000 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.20.101 hevc_vaapi
No more output streams to write to, finishing.e=00:00:07.92
bitrate=3442.3kbits/s speed=3.12x
frame= 217 fps= 78 q=-0.0 Lsize= 3688kB time=00:00:08.68
bitrate=3480.3kbits/s speed=3.11x
video:3688kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.000000%
Input file #0
(/root/media_streams//encoderbitstreams//1080p_blue_sky.yuv):
Input stream #0:0 (video): 217 packets read (674956800 bytes); 217
frames decoded;
Total: 217 packets (674956800 bytes) demuxed
Output file #0 (./hevce_vbr_1920x1080_gop12_refdist0_bitrate4M.h265):
Output stream #0:0 (video): 217 frames encoded; 217 packets muxed
(3776077 bytes);
Total: 217 packets (3776077 bytes) muxed
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Ticket URL: <https://trac.ffmpeg.org/ticket/7268>
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