Low quality video as the result of encoding #152
Description
Hello!
I'm having some problems with encoding videos
Parameters:
Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz 16 cores
RAM 14 gb
Software:
GCC: 7.5.0
CMake: 3.10.2
YASM: Assembler version 1.3.0
OS: Ubuntu 18.04.4 LTS (Bionic Beaver)
I wanted to encode an mp4 video
Used following commands:
$ffmpeg -i my_video.mp4 -an -c copy -y in.yuv
$./SVT-VP9/Bin/Release/SvtVp9EncApp -w 1280 -h 720 -i in.yuv -fps 25 -rc 1 -tbr 7000000 -vbv-maxrate 7000000 -vbv-bufsize 14000000 -intra-period 100 -asm 0 -b out.ivf
Output:
SVT [version] : SVT-VP9 Encoder Lib v0.3.0
SVT [build] : GCC 7.5.0 64 bit
LIB Build date: Jan 25 2022 09:48:56
[WARNING] For best speed performance, run with sudo privileges !
Number of logical cores available: 16
Number of PPCS 31
SVT [config]: Profile [0] Level (auto)
SVT [config]: EncoderMode / Tune : 9 / 1
SVT [config]: EncoderBitDepth : 8
SVT [config]: SourceWidth / SourceHeight : 1280 / 720
SVT [config]: FrameRate / Gop Size : 25 / 101
SVT [config]: HierarchicalLevels / BaseLayerSwitchMode / PredStructure : 3 / 0 / 2
SVT [config]: RCMode / TargetBitrate : VBR / 7000000
Encoding 55
SUMMARY --------------------------------- Channel 1 --------------------------------
Total Frames Frame Rate Byte Count Bitrate
55 25.00 fps 10871312 39532.04 kbps
Channel 1
Average Speed: 11.10 fps
Total Encoding Time: 4954 ms
Total Execution Time: 5277 ms
Average Latency: 4004 ms
Max Latency: 4883 ms
Encoder finished
Then I'm encoding it to mp4
$ffmpeg -i out.ivf -c copy rrr.mp4 -y
Output:
Input #0, ivf, from 'out.ivf':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: vp9 (Profile 0) (VP90 / 0x30395056), yuv420p(tv), 1280x720, 25 tbr, 25 tbn, 25 tbc
Output #0, mp4, to 'rrr.mp4':
Metadata:
encoder : Lavf58.76.100
Stream #0:0: Video: vp9 (Profile 0) (vp09 / 0x39307076), yuv420p(tv), 1280x720, q=2-31, 25 tbr, 12800 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=-1.0 size= 1024kB time=00:00:00.00 bitratframe= 103 fps=0.0 q=-1.0 Lsize= 10618kB time=00:00:02.16 bitrate=40267.7kbits/s speed=41.3x
video:10617kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.012446%
The resulting video is shorter than the input video and the whole output video is TV-noises
I also tried the following encoding parameters and got the same result:
$SvtVp9EncApp -w 1280 -h 720 -i in.yuv -n 0 -asm 0 -fps 25 -b out.ivf
$SvtVp9EncApp -w 1280 -h 720 -enc-mode 8 -tune 0 -i in.yuv -fps 25 -rc 1 -tbr 7000000 -asm 0 -b out.ivf
I tried to run it with a few mp4 videos of different input width and hight and always get the same output
If I run with “-asm 1” I get Illegal instruction error
If I run with -w 1920 -h 1080 (the input video is 1920*1080) then I get Segmentation fault. But if I run with -w 1280 -h 720 it doesn’t get this error.
Could you please advise me where to look in order to fix this?