Hello there,
I have a sample file with the following attributes:
ffprobe -i rv.mkv
ffprobe version N-93814-g48539b62fc Copyright (c) 2007-2019 the FFmpeg
developers
built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04)
configuration: --pkg-config-flags=--static --prefix=/home/brainiarc7/bin
--bindir=/home/brainiarc7/bin --extra-cflags=-I/home/brainiarc7/bin/include
--extra-ldflags=-L/home/brainiarc7/bin/lib --enable-cuda-nvcc
--enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include/
--extra-ldflags=-L/usr/local/cuda/lib64/ --enable-nvenc
--extra-cflags=-I/opt/intel/mediasdk/include
--extra-ldflags=-L/opt/intel/mediasdk/lib
--extra-ldflags=-L/opt/intel/mediasdk/plugins --enable-libmfx
--enable-libass --enable-vaapi --disable-debug --enable-libvorbis
--enable-libvpx --enable-libdrm --enable-opencl --enable-gpl --cpu=native
--enable-opengl --enable-libfdk-aac --enable-libx265 --enable-openssl
--extra-libs='-lpthread -lm -lz' --enable-nonfree
libavutil 56. 26.101 / 56. 26.101
libavcodec 58. 52.101 / 58. 52.101
libavformat 58. 27.103 / 58. 27.103
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 50.100 / 7. 50.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Input #0, matroska,webm, from 'rv.mkv':
Metadata:
ENCODER : Lavf58.27.102
Duration: 00:02:24.77, start: 0.000000, bitrate: 20063 kb/s
Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p(progressive),
2560x1440, 60 fps, 60 tbr, 1k tbn, 120 tbc (default)
Metadata:
ENCODER : Lavc58.51.100 libx264
DURATION : 00:02:24.767000000
Attempting to use either cuvid,nvdec or auto (which selects cuda) for
hwaccel results in the following message:
[h264 @ 0x55ff3d516880] Hardware is lacking required capabilities
[h264 @ 0x55ff3d516880] Failed setup for format cuda: hwaccel
initialisation returned error.
But the encode session runs to completion.
Explicitly setting hwaccel to vdpau fails as such:
[h264 @ 0x560d4b9f3340] hardware accelerator failed to decode picture
Error while decoding stream #0:0: Input/output error
[h264 @ 0x560d4b9f9280] hardware accelerator failed to decode picture
Error while decoding stream #0:0: Input/output error
[h264 @ 0x560d4bd5a8c0] hardware accelerator failed to decode picture
Error while decoding stream #0:0: Input/output error
[matroska,webm @ 0x560d4b9d2bc0] Element at 0x15a3f012 ending at 0x15a3f0a4
exceeds containing master element ending at 0x15a3f006
[h264 @ 0x560d4bf22d00] hardware accelerator failed to decode picture
Error while decoding stream #0:0: Input/output error
Last message repeated 11 times
Output #0, mp4, to
'/home/brainiarc7/Desktop/src/benchmarks/final/benchmark-nvenc-file.mp4':
Metadata:
encoder : Lavf58.27.103
Stream #0:0: Video: h264 (h264_nvenc) (High 4:4:4 Predictive) (avc1 /
0x31637661), yuv444p, 2560x1440, q=-1--1, 7500 kb/s, 60 fps, 15360 tbn, 60
tbc (default)
Metadata:
DURATION : 00:02:24.767000000
encoder : Lavc58.52.101 h264_nvenc
Side data:
cpb: bitrate max/min/avg: 15000000/0/7500000 buffer size: 15000000
vbv_delay: -1
frame= 0 fps=0.0 q=0.0 Lsize= 0kB time=00:00:00.00 bitrate=N/A
speed= 0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
Conversion failed!
In this case, with vdpau, the error is not recoverable and the encoder
fails.
The command used:
ffmpeg -y -stats -hwaccel nvdec \
-i $(pwd)/rv.mkv \
-c:v h264_nvenc -bf:v 3 -rc:v vbr_hq -qp:v 19 -profile:v main \
-b:v 7.5M -maxrate:v 15M -r:v 60 -an -f mp4 $(pwd)/benchmark-nvenc-file.mp4
FFmpeg version used:
ffmpeg
ffmpeg version N-93814-g48539b62fc Copyright (c) 2000-2019 the FFmpeg
developers
built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04)
configuration: --pkg-config-flags=--static --prefix=/home/brainiarc7/bin
--bindir=/home/brainiarc7/bin --extra-cflags=-I/home/brainiarc7/bin/include
--extra-ldflags=-L/home/brainiarc7/bin/lib --enable-cuda-nvcc
--enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include/
--extra-ldflags=-L/usr/local/cuda/lib64/ --enable-nvenc
--extra-cflags=-I/opt/intel/mediasdk/include
--extra-ldflags=-L/opt/intel/mediasdk/lib
--extra-ldflags=-L/opt/intel/mediasdk/plugins --enable-libmfx
--enable-libass --enable-vaapi --disable-debug --enable-libvorbis
--enable-libvpx --enable-libdrm --enable-opencl --enable-gpl --cpu=native
--enable-opengl --enable-libfdk-aac --enable-libx265 --enable-openssl
--extra-libs='-lpthread -lm -lz' --enable-nonfree
libavutil 56. 26.101 / 56. 26.101
libavcodec 58. 52.101 / 58. 52.101
libavformat 58. 27.103 / 58. 27.103
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 50.100 / 7. 50.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options]
outfile}...
Use -h to get full help or, even better, run 'man ffmpeg'
The GPU matrix published by NVIDIA only indicates support for HEVC @ 4:4:4
: https://developer.nvidia.com/video-encode-decode-gpu-support-matrix. That
page indicates support for H.264 4:4:4 in NVENC (as from GM107+) but
information on decode capability on the same is absent.
According to the commit:
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/83c7ac2e47efd96927127c1c385cdbb5fb53cb02
Only two codecs can handle 4:4:4: HEVC and MJPEG.
Would this imply that support for H.264 @ 4:4:4 is either unsupported (in
hardware, as implied above) or omitted in FFmpeg? Please clarify.
Thanks for your time,
Dennis.
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