我尝试在我自己的 rtmp nginx 服务器上流式传输一个带有 mp3 的静态 jpeg 图像，大约一个小时，从我的 nginx rtmp 到 YouTube，但音频不是恒定的，没有图像... 这是我用的...
#! /bin/bash
VBR="1500k"
FPS="30"
QUAL="ultrafast"
YOUTUBE_URL="rtmp://localhost:1935/live"
YOUTUBE_KEY="test"
VIDEO_SOURCE="image.jpg"
AUDIO_SOURCE="music.mp3"
AUDIO_ENCODER="libmp3lame"
ffmpeg \
-loop 1 \
-re \
-framerate $FPS \
-i "$VIDEO_SOURCE" \
-thread_queue_size 512 \
-i "$AUDIO_SOURCE" \
-c:v libx264 -preset $QUAL -r $FPS -g $(($FPS *2)) -b:v $VBR \
-c:a $AUDIO_ENCODER -threads "$(nproc)" -ar 44100 -b:a 128k -bufsize 512k -pix_fmt yuv420p \
-vf scale=1280x720,setsar=1:1 \
-f flv $YOUTUBE_URL/$YOUTUBE_KEY
输出：
ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
configuration: --prefix=/usr --extra-version=1ubuntu0.1 --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-avisynth --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-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --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-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Input #0, image2, from 'unsplash.jpg':
Duration: 00:00:00.03, start: 0.000000, bitrate: 1976946 kb/s
Stream #0:0: Video: mjpeg (Progressive), yuvj420p(pc, bt470bg/unknown/unknown), 7952x4472 [SAR 72:72 DAR 994:559], 30 tbr, 30 tbn, 30 tbc
Input #1, mp3, from 'ArtOfTrippyCode.mp3':
Metadata:
encoder : Lavf58.29.100
Duration: 01:07:25.34, start: 0.023021, bitrate: 141 kb/s
Stream #1:0: Audio: mp3, 48000 Hz, stereo, fltp, 141 kb/s
Metadata:
encoder : Lavc58.54
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Stream #1:0 -> #0:1 (mp3 (mp3float) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
[swscaler @ 0x564a7bd3ed80] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x564a7b3e9680] VBV maxrate unspecified, assuming CBR
[libx264 @ 0x564a7b3e9680] using SAR=1/1
[libx264 @ 0x564a7b3e9680] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x564a7b3e9680] profile Constrained Baseline, level 3.1
[libx264 @ 0x564a7b3e9680] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=2 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://localhost:1935/live/test':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: 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
Metadata:
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/1500000 buffer size: 512000 vbv_delay: -1
Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc58.54.100 libmp3lame
[flv @ 0x564a7b3e8340] Failed to update header with correct duration.863.7kbits/s speed=0.0424x
[flv @ 0x564a7b3e8340] Failed to update header with correct filesize.
frame= 15 fps=1.6 q=-1.0 Lsize= 97kB time=00:00:00.47 bitrate=1686.4kbits/s speed=0.0511x
video:88kB audio:8kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.021540%
[libx264 @ 0x564a7b3e9680] frame I:1 Avg QP:34.00 size: 25690
[libx264 @ 0x564a7b3e9680] frame P:14 Avg QP:29.21 size: 4569
[libx264 @ 0x564a7b3e9680] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x564a7b3e9680] mb P I16..4: 0.5% 0.0% 0.0% P16..4: 16.0% 0.0% 0.0% 0.0% 0.0% skip:83.5%
[libx264 @ 0x564a7b3e9680] coded y,uvDC,uvAC intra: 51.0% 11.4% 1.2% inter: 8.2% 3.3% 0.1%
[libx264 @ 0x564a7b3e9680] i16 v,h,dc,p: 32% 25% 31% 13%
[libx264 @ 0x564a7b3e9680] i8c dc,h,v,p: 82% 11% 7% 0%
[libx264 @ 0x564a7b3e9680] kb/s:1434.54