Hello,
I have been trying to use udp multicast to send high speed low latency
video to multiple computers simultaneously. To do this, I have been using
mpegts as a container like follows:
ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=30 -c:v dirac -f mpegts udp://
239.0.0.1:1234
ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=30 -c:v dnxhd -profile:v dnxhr_hq
-pix_fmt yuv422p -f mpegts udp://239.0.0.1:1234
ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=30 -c:v cfhd -pix_fmt yuv422p -f
mpegts udp://239.0.0.1:1234
ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=30 -c:v hap -pix_fmt yuv422p -f
mpegts udp://239.0.0.1:1234
ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=30 -c:v huffyuv -pix_fmt yuv422p
-f mpegts udp://239.0.0.1:1234
Only dirac works out of the box - the others give messages similar to:
$ ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=30 -c:v dnxhd -profile:v
dnxhr_hq -pix_fmt yuv422p -f mpegts udp://239.0.0.1:1234
ffmpeg version 4.3.1-4ubuntu1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10 (Ubuntu 10.2.0-9ubuntu2)
configuration: --prefix=/usr --extra-version=4ubuntu1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --enable-avresample --disable-filter=resample
--enable-gnutls --enable-ladspa --enable-libaom --enable-libass
--enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio
--enable-libcodec2 --enable-libdav1d --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame
--enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
--enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg
--enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq
--enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
--enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-libmfx
--enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc
--enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Input #0, lavfi, from 'testsrc2=s=1920x1080:d=30':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080
[SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> dnxhd (native))
Press [q] to stop, [?] for help
Output #0, mpegts, to 'udp://239.0.0.1:1234':
Metadata:
encoder : Lavf58.45.100
Stream #0:0: Video: dnxhd (DNXHR HQ) (AVdh / 0x68645641), yuv422p,
1920x1080 [SAR 1:1 DAR 16:9], q=2-1024, 200 kb/s, 25 fps, 90k tbn, 25 tbc
Metadata:
encoder : Lavc58.91.100 dnxhd
[mpegts @ 0x5588eb03ebc0] Stream 0, codec dnxhd, is muxed as a private data
stream and may not be recognized upon reading.
This is probably because dnxhd(?), cfhd, hap, and huffyuv do not have SMPTE
registered identifiers. Using ffplay, I can't seem to figure out how to map
that private data stream back to being a video codec. Is there a way to
view video in private data streams with ffplay?
Alternatively, I have been looking into other container formats to use for
udp multicast and the above codecs. Matroska works but only if ffplay is
running as the receiver before the sender starts sending. eg
ffplay udp://239.0.0.1:1234 & # then
ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=30 -c:v cfhd -pix_fmt yuv422p -f
matroska udp://239.0.0.1:1234
If the receiver is started after ffmpeg, I get the following message:
ffplay version 4.3.1-4ubuntu1 Copyright (c) 2003-2020 the FFmpeg developers
built with gcc 10 (Ubuntu 10.2.0-9ubuntu2)
configuration: --prefix=/usr --extra-version=4ubuntu1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --enable-avresample --disable-filter=resample
--enable-gnutls --enable-ladspa --enable-libaom --enable-libass
--enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio
--enable-libcodec2 --enable-libdav1d --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame
--enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
--enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg
--enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq
--enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
--enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-libmfx
--enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc
--enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
udp://239.0.0.1:1234: Invalid data found when processing input
Are there some options that I need to specify in ffmpeg to avoid this when
muxing with Matroska? Like repeating headers, limiting packet sizes etc.
Otherwise are there other recommendations of alternative container formats
to use when multicast udp streaming?
Regards
Rohan
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