Dne 12.2.2017 v 23:20 Philip Langdale napsal(a):
On Sun, 12 Feb 2017 22:43:41 +0100
Miroslav Slugeň <thunde...@email.cz> wrote:
Dne 12.2.2017 v 22:31 Timo Rothenpieler napsal(a):
On 2/12/2017 10:25 PM, Miroslav Slugeň wrote:
This patch is for discussion only, not ready to commit yet and
maybe newer will be.
NVENC in current CUDA 8 SDK is setting wrong aspect ratio when
encoding resolution 720x576 and 720x480 and using AR 4:3 or 16:9
it will encode to h264 header that 15:11 and 20:11 is used. This
is very very very ugly way how to fix it. I hope someone in NVIDIA
will fix this soon, because all encoded streams are not displayed
correctly for example in videojs player.
nvenc.c had some compensation for this, which was somewhat recently
removed, because nvidia fixed something regarding it:
http://git.videolan.org/?p=ffmpeg.git;a=commit;h=829db8effd76b579ae9aca5ee8f85d3ade6af253
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I know that, i am monitoring all nvenc and cuvid changes in ffmpeg.
Fix is not working anymore in current drivers. What is working is if
you set aspect ratio 16000x9001 it will give you almost correct
output, but fixing this in h264 SPP is better solution.
M.
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If it's still happening, let's just restore the original workaround.
But I stopped being able to reproduce the problem locally, and I can't
reproduce it right now with a 720x576 sample.
Note that the SDK is completely irrelevant to playback behaviour. The
CUDA SDK doesn't include current cuvid/nvenc headers and the Video SDK
isn't required because we bundle/reimplement headers with ffmpeg.
You are likely not using a new enough driver release to have the fix in
it. I'm using 378.09 here.
--phil
I am using current STABLE drivers 375.26, because BETA drivers 378.09
caused some crashes while encoding on NVENC.
I tested this on BETA drivers too and it is still same.
Original workaround is not working anymore :(
INPUT: Stream #0:0[0x401]: Video: mpeg2video (Main) ([2][0][0][0] /
0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps,
25 tbr, 90k tbn, 50 tbc
OUTPUT: Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuv420p(progressive), 720x576 [SAR 16:11 DAR 20:11], 25 fps, 25 tbr, 90k
tbn, 50 tbc
COMMAND: ffmpeg -deint adaptive -hwaccel cuvid -c:v mpeg2_cuvid -i
"in.ts" -y -c:v h264_nvenc -c:a copy -b:v 1M -preset hq -f mpegts "out.ts"
Also someone else is complaining about this issue:
http://superuser.com/questions/1174097/ffmpegnvenc-encoding-strange-aspect-ratio
M.
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