[FFmpeg-user] Poor NDI performance

[Marton Balint]

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