I am streaming a concat playlist of 30fps videos using the following:
ffmpeg -re -f concat -safe 0 -i ~/myplaylist.txt -c:v libx264 -preset veryfast -b:v 6000k -maxrate 6000k -bufsize 2M -g 60 -c:a aac -b:a 160k -ac 2 -ar 44100 -f flv rtmp://myhost/my_streamkey
When I stream this to Twitch, it works flawlessly. When I stream to Steam, it crashes frequently and seemingly mostly when changing from one video to the next (though sometimes just in the middle of a video).
The feedback from the Steam broadcast page says:
Make sure your upload key-frame interval is set to 2 seconds and use constant bitrate (CBR). Limit your encoders group of picture (GOP) to at most two times your framerate.
The output from command line is:
$ ffmpeg -re -f concat -safe 0 -i ~/myplaylist.txt -c:v libx264 -preset veryfast -b:v 6000k -maxrate 6000k -bufsize 2M -g 60 -c:a aac -b:a 160k -ac 2 -ar 44100 -f flv rtmp://myhost/my_streamkey
ffmpeg version 4.3.1-0york0~18.04 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --prefix=/usr --extra-version='0york0~18.04' --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-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-libzimg --enable-pocketsphinx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --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
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x563ff0161040] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from '/path/to/myplaylist.txt':
Duration: N/A, start: 0.000000, bitrate: 7699 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 7510 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
Metadata:
creation_time : 2020-11-12T14:10:16.000000Z
handler_name : ?Mainconcept Video Media Handler
encoder : AVC Coding
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s
Metadata:
creation_time : 2020-11-12T14:10:16.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x563ff03792c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x563ff03792c0] profile High, level 4.0
[libx264 @ 0x563ff03792c0] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=4 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=60 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=abr mbtree=1 bitrate=4500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=6000 vbv_bufsize=2000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
Output #0, flv, to 'rtmp://myhost/my_streamkey':
Metadata:
encoder : Lavf58.45.100
Stream #0:0(eng): Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p(progressive), 1920x1080, q=-1--1, 4500 kb/s, 29.97 fps, 1k tbn, 29.97 tbc
Metadata:
creation_time : 2020-11-12T14:10:16.000000Z
handler_name : ?Mainconcept Video Media Handler
encoder : Lavc58.91.100 libx264
Side data:
cpb: bitrate max/min/avg: 6000000/0/4500000 buffer size: 2000000 vbv_delay: N/A
Stream #0:1(eng): Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 160 kb/s
Metadata:
creation_time : 2020-11-12T14:10:16.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
encoder : Lavc58.91.100 aac
av_interleaved_write_frame(): Connection reset by peer00.90 bitrate=4382.7kbits/s speed=0.999x
Last message repeated 1 times
[flv @ 0x563ff01925c0] Failed to update header with correct duration.
[flv @ 0x563ff01925c0] Failed to update header with correct filesize.
Error writing trailer of rtmp://myhost/my_streamkey: Connection reset by peer
frame= 9019 fps= 30 q=23.0 Lsize= 161053kB time=00:05:00.93 bitrate=4384.2kbits/s speed=0.999x
video:155757kB audio:4964kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.205955%
[libx264 @ 0x563ff03792c0] frame I:265 Avg QP:18.20 size: 93130
[libx264 @ 0x563ff03792c0] frame P:3327 Avg QP:22.66 size: 29256
[libx264 @ 0x563ff03792c0] frame B:5427 Avg QP:22.91 size: 6949
[libx264 @ 0x563ff03792c0] consecutive B-frames: 16.7% 7.1% 6.2% 70.0%
[libx264 @ 0x563ff03792c0] mb I I16..4: 42.2% 31.5% 26.3%
[libx264 @ 0x563ff03792c0] mb P I16..4: 16.5% 20.0% 2.9% P16..4: 17.7% 5.5% 2.2% 0.0% 0.0% skip:35.2%
[libx264 @ 0x563ff03792c0] mb B I16..4: 2.3% 2.6% 0.1% B16..8: 12.3% 2.7% 0.2% direct: 5.4% skip:74.3% L0:43.2% L1:48.0% BI: 8.8%
[libx264 @ 0x563ff03792c0] 8x8 transform intra:48.1% inter:20.7%
[libx264 @ 0x563ff03792c0] coded y,uvDC,uvAC intra: 37.1% 40.0% 12.4% inter: 5.0% 8.9% 0.3%
[libx264 @ 0x563ff03792c0] i16 v,h,dc,p: 45% 26% 16% 13%
[libx264 @ 0x563ff03792c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 29% 24% 4% 3% 3% 4% 3% 4%
[libx264 @ 0x563ff03792c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 24% 16% 6% 6% 6% 6% 5% 5%
[libx264 @ 0x563ff03792c0] i8c dc,h,v,p: 55% 21% 19% 5%
[libx264 @ 0x563ff03792c0] Weighted P-Frames: Y:2.8% UV:1.3%
[libx264 @ 0x563ff03792c0] kb/s:4246.17
[aac @ 0x563ff0193640] Qavg: 11175.629
Conversion failed!
I've been working my way through the docs and I'm sure there's some obvious answer in the docs or in the output, but my video/streaming knowledge is pretty basic.
Any help very much appreciated 🙏
UPDATE: Info from each input in playlist.txt...
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2020-11-10T10:36:22.000000Z
Duration: 02:07:02.93, start: 0.000000, bitrate: 5304 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 5110 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2020-11-10T10:36:22.000000Z
handler_name : ?Mainconcept Video Media Handler
encoder : AVC Coding
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
Metadata:
creation_time : 2020-11-10T10:36:22.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2020-11-10T11:03:14.000000Z
Duration: 02:11:03.21, start: 0.000000, bitrate: 7017 kb/s
Stream #1:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 6823 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2020-11-10T11:03:14.000000Z
handler_name : ?Mainconcept Video Media Handler
encoder : AVC Coding
Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
Metadata:
creation_time : 2020-11-10T11:03:15.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '3.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2020-11-10T11:33:40.000000Z
Duration: 02:09:47.01, start: 0.000000, bitrate: 5979 kb/s
Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 5785 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2020-11-10T11:33:40.000000Z
handler_name : ?Mainconcept Video Media Handler
encoder : AVC Coding
Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
Metadata:
creation_time : 2020-11-10T11:33:40.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
myplaylist.txt, such as withffmpeg -i input0.mp4 -i input1.mp4 -i input2.mp4, etc (no file will be output, it's just for info purposes).