Re: [FFmpeg-user] NVENC HEVC Stuttering / macroblock display issue on LG TV
Zheer Zheer gmail.com> writes: > I have now tried with level 3.1 and have the same problem. Does setting the level actually makes a difference? Levels from 1 to 6.2 should be supported. Did you test with the HEVC reference decoder to verify if a valid stream was written? If that works, I suggest you contact LG: Their decoder seems to fail... Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] NVENC HEVC Stuttering / macroblock display issue on LG TV
Hi Carl, I have now tried with level 3.1 and have the same problem. Running the same command line with x265 however plays perfectly well. ffmpeg -i sample.mp4 -y -c:v nvenc_hevc -preset slow -s 720:576 -level 3.1 -r 24000/1001 -c:a aac -aq 128k -c:s copy sampleNvencHEVC.ts ffmpeg -i sample.mp4 -y -c:v libx265 -preset slow -x265-params bframes=0 -s 720:576 -level 3.1 -r 24000/1001 -c:a aac -aq 128k -c:s copy sampleX265bf0.ts I've also done more test, and seen differences with the GOP and bufsize parameters that I had missed in my previous testing. I have not been able to get a defect free video though... Reducing GOP a lot, to say 15 helps (the default appears to be 250) - my take is something goes wrong playing the P frames and the I frame wipe things clean.. X265 is using a 250 GOP though so why would it not work with NVENC .. The buffsize also delayed the apparition of macroblock issues. the command line above resulted in a VBR of 2.5M so I've tested with bufsize from 500k to 10M - the best result was around 2M but it only just delayed the problem showing up Any other thoughts ? Many thanks > > The original frame rate which is 23.976. setting in to -r 24 seems to work > too, but with other framerates (20, 25, 30), I'm seeing stuttering issues. > > > > - HEVC levels 4.1 to 5.0 > > > > > - Did you also try lower levels? > > > > I have not tried lower than 4.1 with HEVC (the encoder returned an error > from 4.0, probably because the resolution / bit rates I used were higher > than allowed at 4) > > > > > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] NVENC HEVC Stuttering / macroblock display issue on LG TV
> Which frame rate works fine with nvenc_h264? The original frame rate which is 23.976. setting in to -r 24 seems to work too, but with other framerates (20, 25, 30), I'm seeing stuttering issues. > > - HEVC levels 4.1 to 5.0 > - Did you also try lower levels? I have not tried lower than 4.1 with HEVC (the encoder returned an error from 4.0, probably because the resolution / bit rates I used were higher than allowed at 4) ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] NVENC HEVC Stuttering / macroblock display issue on LG TV
Pierre-Yves Hocquellet gmail.com> writes: > The same sample encoded with nvenc_h264 plays smoothly, > no problem. although I've noticed that if I attempt to > change the frame rate - r from the original, I get some > of the same issues. Which frame rate works fine with nvenc_h264? > - HEVC levels 4.1 to 5.0 Did you also try lower levels? Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
