On Wed, 18 Jul 2018, Micael Silva wrote:
On Wed, Jul 18, 2018 at 8:13 AM, Jon <[email protected]> wrote:
On Tue, 17 Jul 2018 at 23:15, Carl Eugen Hoyos <[email protected]> wrote:
>
> 2018-07-17 20:16 GMT+02:00, Jon <[email protected]>:
> > 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
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