[FFmpeg-devel] [PATCH] (for discussion): nvenc: fix wrong aspect ratio for 720x576 and 720x480 resolution

Miroslav Slugeň thunder.m at email.cz
Sun Feb 12 23:43:41 EET 2017

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.


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