[FFmpeg-user] Poor NDI performance

[Micael Silva]

On Sun, Jul 22, 2018 at 3:59 PM, Marton Balint <cus at passwd.hu> wrote:

>
> On Wed, 18 Jul 2018, Micael Silva wrote:
>
> On Wed, Jul 18, 2018 at 8:13 AM, Jon <jon.tech.uk at gmail.com> wrote:
>>
>> On Tue, 17 Jul 2018 at 23:15, Carl Eugen Hoyos <ceffmpeg at gmail.com>
>>> wrote:
>>> >
>>> > 2018-07-17 20:16 GMT+02:00, Jon <jon.tech.uk at gmail.com>:
>>> > > After successfully compiling ffmpeg on Debian 9 64bit, following the
>>> > > instructions at https://trac.ffmpeg.org/wiki/CompilationGuide and
>>> > > adding the relevant includes for NDI using the Newtek SDK
>>> > > (InstallNDISDK_v3_Linux.sh from https://www.newtek.com/ndi/sdk/) and
>>> > > compiler flag (--enable-libndi_newtek), the resulting builds of
>>> ffmpeg
>>> > > / ffplay do now playback NDI network streams but playback performance
>>> > > is poor compared to playing back through OBS using the NDI plug-in
>>> > > from https://github.com/Palakis/obs-ndi on the same machine. OBS has
>>> > > smooth playback whereas ffmpeg is jittery.
>>> > >
>>> > > ./ffplay -fs -f libndi_newtek -i "NDI test (test-laptop-pgm)"
>>> >
>>> > Complete, uncut console output missing.
>>> > Do you see the same jitter if you reencode with ffmpeg?
>>> >
>>> > Carl Eugen
>>>
>>> Thanks for your prompt reply Carl.
>>>
>>> Output from ffplay which produces glitchy playback:
>>>
>>> $ ./ffplay -fs -f libndi_newtek -i "COMPUTER (jonny-ndi-pgm)"
>>> ffplay version N-91482-g8aa6d9a Copyright (c) 2003-2018 the FFmpeg
>>> developers
>>>   built with gcc 7 (Debian 7.3.0-25)
>>>   configuration: --prefix=/home/blitz/ffmpeg_build
>>> --pkg-config-flags=--static
>>> --extra-cflags=-I/home/blitz/ffmpeg_build/include
>>> --extra-ldflags=-L/home/blitz/ffmpeg_build/lib --extra-libs='-lpthread
>>> -lm' --bindir=/home/blitz/bin --enable-gpl --enable-libaom
>>> --enable-libass --enable-libfdk-aac --enable-libfreetype
>>> --enable-libmp3lame --enable-libopus --enable-libvorbis
>>> --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
>>> --enable-libndi_newtek
>>>   libavutil      56. 18.102 / 56. 18.102
>>>   libavcodec     58. 21.105 / 58. 21.105
>>>   libavformat    58. 17.101 / 58. 17.101
>>>   libavdevice    58.  4.101 / 58.  4.101
>>>   libavfilter     7. 26.100 /  7. 26.100
>>>   libswscale      5.  2.100 /  5.  2.100
>>>   libswresample   3.  2.100 /  3.  2.100
>>>   libpostproc    55.  2.100 / 55.  2.100
>>> Input #0, libndi_newtek, from 'COMPUTER (jonny-ndi-pgm)':0B f=0/0
>>>   Duration: N/A, start: 3258.294488, bitrate: 443779 kb/s
>>>     Stream #0:0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
>>>     Stream #0:1: Video: rawvideo (UYVY / 0x59565955),
>>> uyvy422(progressive), 1280x720 [SAR 1:1 DAR 16:9], 442368 kb/s, 30
>>> fps, 30 tbr, 10000k tbn
>>> 3275.05 A-V: -0.001 fd=   1 aq=  114KB vq=16200KB sq=    0B f=0/0
>>>
>>
> You should try these ffplay options
>   -infbuf
>   -sync video or -sync ext
>   -noframedrop
> Or a combination of those :)
>
> Thanks,
> Marton


I've tried ffplay -sync video and works very well. I knew that need some
clocking on the video stream but i'm very bad with ffplay options. Thanks
so much!