Moritz,
>Does it need to be fixed bitrate? (Just wondering.)
It does need to be a CBR. It will be converted to an adaptive stream for a
streaming app
>Is this ultimately the issue? That you can't encode at real time?
These are live streams that need to be forwarded off, packaged in HLS and sent
to streaming app and accessible within 1 minute from broadcast so that is part
of it.
>At "constant"/average bitrate (-b:v), you should be able to use libx264's
>presets to trade off quality for speed. Perhaps you can achieve >1.0x that
>way. I don't see how you will do three simultaneous encodes though.
>BTW, eight CPUs to encode 1280x720@59.94 in realtime seems sort of heavy. Are
>these Atom cores or something similarly weak?
I felt that I should get more horsepower as well and that is the main reason I
started this thread. I have been working with live streams for a few years now
but surprisingly, this is the first time I have needed to dig into transcoding
like this so I was hoping there was something glaringly inefficient about how I
was trying to get to the end result. I see some venders of transcoders using
CPUs that are not as powerful as this one on their transcoding hardware
(without GPU or ASIC chips) and I am assuming they are leveraging FFMPEG or
something similar in the background.
I have edited my command a bit. The biggest performance change I am seeing is
changing the preset to ultrafast. I am not sure that quality will work yet but
it gets the utilization down to 350% CPU usage. The other performance gain
comes from combing the 3 output bitrates into a single command. Not sure if
anyone has further suggestions for this?
=========== New command ============
transcoder:~$ ffmpeg -i
'udp://@239.129.2.110:59110?fifo_size=1000000&overrun_nonfatal=1' \
> -c:v libx264 -x264opts keyint=120:no-scenecut -preset ultrafast -b:v 6000k
> -minrate 6000k -maxrate 6000k -bufsize 12000k -profile:v high -level 4.0 -c:a
> aac -f mpegts udp://@239.129.2.240:59240 \
> -c:v libx264 -x264opts keyint=120:no-scenecut -preset ultrafast -b:v 3500k
> -minrate 3500k -maxrate 3500k -bufsize 9000k -profile:v high -level 4.0 -c:a
> aac -f mpegts udp://@239.129.2.241:59241 \
> -c:v libx264 -x264opts keyint=120:no-scenecut -preset ultrafast -b:v 1500k
> -minrate 1500k -maxrate 1500k -bufsize 3000k -profile:v high -level 4.0 -c:a
> aac -f mpegts udp://@239.129.2.242:59242
===========OUTPUT ===============
ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype
--enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame
--enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus
--enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2
--enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal
--enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm
--enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv
--enable-libx264 --enable-shared
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
[mpeg2video @ 0x556b70e9c580] Invalid frame dimensions 0x0.
Last message repeated 7 times
Input #0, mpegts, from
'udp://@239.129.2.110:59110?fifo_size=1000000&overrun_nonfatal=1':
Duration: N/A, start: 95234.341144, bitrate: N/A
Program 3
Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, bt709, bottom first), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions,
59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
Stream #0:1[0x34](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
5.1(side), fltp, 384 kb/s
Stream #0:2[0x35](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
fltp, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (ac3 (native) -> aac (native))
Stream #0:0 -> #1:0 (mpeg2video (native) -> h264 (libx264))
Stream #0:1 -> #1:1 (ac3 (native) -> aac (native))
Stream #0:0 -> #2:0 (mpeg2video (native) -> h264 (libx264))
Stream #0:1 -> #2:1 (ac3 (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x556b70e951e0] using SAR=1/1
[libx264 @ 0x556b70e951e0] using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3
SSE4.2 AVX XOP FMA4
[libx264 @ 0x556b70e951e0] profile Constrained Baseline, level 4.0
Output #0, mpegts, to 'udp://@239.129.2.240:59240':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9],
q=-1--1, 6000 kb/s, 59.94 fps, 90k tbn, 59.94 tbc
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 6000000/0/6000000 buffer size: 12000000
vbv_delay: -1
Stream #0:1(eng): Audio: aac (LC), 48000 Hz, 5.1(side), fltp, 341 kb/s
Metadata:
encoder : Lavc57.107.100 aac
[libx264 @ 0x556b70e8d040] using SAR=1/1
[libx264 @ 0x556b70e8d040] using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3
SSE4.2 AVX XOP FMA4
[libx264 @ 0x556b70e8d040] profile Constrained Baseline, level 4.0
Output #1, mpegts, to 'udp://@239.129.2.241:59241':
Metadata:
encoder : Lavf57.83.100
Stream #1:0: Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9],
q=-1--1, 3500 kb/s, 59.94 fps, 90k tbn, 59.94 tbc
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 3500000/0/3500000 buffer size: 9000000
vbv_delay: -1
Stream #1:1(eng): Audio: aac (LC), 48000 Hz, 5.1(side), fltp, 341 kb/s
Metadata:
encoder : Lavc57.107.100 aac
[libx264 @ 0x556b71482860] using SAR=1/1
[libx264 @ 0x556b71482860] using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3
SSE4.2 AVX XOP FMA4
[libx264 @ 0x556b71482860] profile Constrained Baseline, level 4.0
Output #2, mpegts, to 'udp://@239.129.2.242:59242':
Metadata:
encoder : Lavf57.83.100
Stream #2:0: Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9],
q=-1--1, 1500 kb/s, 59.94 fps, 90k tbn, 59.94 tbc
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 1500000/0/1500000 buffer size: 3000000
vbv_delay: -1
Stream #2:1(eng): Audio: aac (LC), 48000 Hz, 5.1(side), fltp, 341 kb/s
Metadata:
encoder : Lavc57.107.100 aac
frame=163201 fps= 60 q=27.0 q=30.0 q=36.0 size= 2257986kB time=00:45:22.90
bitrate=6793.3kbits/s speed= 1x
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