I'm using this script to stream a 30s .mp4 video file with a 2min audio track in .mp3 format:
#! /bin/bash
VBR="1500k"
FPS="30"
QUAL="ultrafast"
YOUTUBE_URL=" rtmp://a.rtmp.youtube.com/live2"
YOUTUBE_KEY="**********"
VIDEO_SOURCE="test_video_4.mp4"
AUDIO_SOURCE="test_audio_3.mp3"
AUDIO_ENCODER="aac"
ffmpeg \
-stream_loop -1 \
-re \
-i "$VIDEO_SOURCE" \
-thread_queue_size 512 \
-i "$AUDIO_SOURCE" \
-c:v libx264 -preset $QUAL -r $FPS -g $(($FPS *2)) -b:v $VBR \
-c:a $AUDIO_ENCODER -threads 6 -ar 44100 -b:a 128k -bufsize 512k -pix_fmt yuv420p \
-fflags +shortest -max_interleave_delta 50000 \
-f flv $YOUTUBE_URL/$YOUTUBE_KEY
Both the audio and the video get played correctly the first time, with the video looping while the audio playback is completed (since it's shorter). The only problem is that the audio loop does not work and as soon the audio completes the first time the stream simply stops.
Here's the log:
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
built with Apple clang version 12.0.0 (clang-1200.0.32.27)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_4 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack 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, mov,mp4,m4a,3gp,3g2,mj2, from 'test_video_4.mp4': Metadata: major_brand : mp42 minor_version : 1 compatible_brands: isommp41mp42 creation_time : 2020-11-27T18:38:02.000000Z Duration: 00:00:39.46, start: 0.000000, bitrate: 12081 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 12033 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 48k tbc (default) Metadata: creation_time : 2020-11-27T18:38:02.000000Z handler_name : Core Media Video Input #1, mp3, from 'test_audio_3.mp3': Metadata: genre : Cinematic album : YouTube Audio Library title : Test Title artist : Test Artist Duration: 00:02:12.21, start: 0.025057, bitrate: 320 kb/s Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s Metadata: encoder : LAME3.99r Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264)) Stream #1:0 -> #0:1 (mp3 (mp3float) -> aac (native)) Press [q] to stop, [?] for help [libx264 @ 0x7fa825031600] VBV maxrate unspecified, assuming CBR [libx264 @ 0x7fa825031600] using SAR=1/1 [libx264 @ 0x7fa825031600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @ 0x7fa825031600] profile Constrained Baseline, level 3.1, 4:2:0, 8-bit [libx264 @ 0x7fa825031600] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=60 keyint_min=6 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=cbr mbtree=0 bitrate=1500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=1500 vbv_bufsize=512 nal_hrd=none filler=0 ip_ratio=1.40 aq=0 Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/*****':
Metadata: major_brand : mp42 minor_version : 1 compatible_brands: isommp41mp42 encoder : Lavf58.45.100 Stream #0:0(und): Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 1500 kb/s, 30 fps, 1k tbn, 30 tbc (default) Metadata: creation_time : 2020-11-27T18:38:02.000000Z handler_name : Core Media Video encoder : Lavc58.91.100 libx264 Side data: cpb: bitrate max/min/avg: 0/0/1500000 buffer size: 512000 vbv_delay: N/A Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s Metadata: encoder : Lavc58.91.100 aac Larger timestamp than 24-bit: 0xffff9b44kB time=00:02:37.43 bitrate=1292.6kbits/s speed=0.995x [flv @ 0x7fa825032800] Failed to update header with correct duration. [flv @ 0x7fa825032800] Failed to update header with correct filesize. frame= 3790 fps= 24 q=-1.0 Lsize= 24962kB time=00:02:38.03 bitrate=1294.0kbits/s speed=0.997x video:22719kB audio:2081kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.656017% [libx264 @ 0x7fa825031600] frame I:64 Avg QP:36.43 size: 38436 [libx264 @ 0x7fa825031600] frame P:3726 Avg QP:28.61 size: 5583 [libx264 @ 0x7fa825031600] mb I I16..4: 100.0% 0.0% 0.0% [libx264 @ 0x7fa825031600] mb P I16..4: 3.3% 0.0% 0.0% P16..4: 13.6% 0.0% 0.0% 0.0% 0.0% skip:83.1% [libx264 @ 0x7fa825031600] coded y,uvDC,uvAC intra: 57.8% 71.6% 47.8% inter: 6.0% 7.1% 2.1% [libx264 @ 0x7fa825031600] i16 v,h,dc,p: 21% 39% 23% 18% [libx264 @ 0x7fa825031600] i8c dc,h,v,p: 36% 38% 16% 10% [libx264 @ 0x7fa825031600] kb/s:1177.39 [aac @ 0x7fa82502d800] Qavg: 179.328 Exiting normally, received signal 2.
