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问ffmpeg x11grab到可流格式
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Stack Overflow用户

提问于 2021-03-28 00:41:13

回答 1查看 1.8K关注 0票数 1

2 FFMPEG工艺

(1)将ffmpeg x11grab生成为.mp4 (2)获取.mp4并同时将其重新流到多个rtmp端点

发出生成的文件在(1)中有此错误“莫夫原子未找到”

这是生成(1)的命令：

ffmpeg -re -y -f x11grab -draw_mouse 0 -framerate 30 
-video_size $RESOLUTION -i :$DISPLAY_NUM -c:a aac -c:v libx264 
-movflags +faststart -preset ultrafast -crf 28 -refs 4 -qmin 4 
-pix_fmt yuv420p -filter:v fps=30 file.mp4

在(2) =>中，当我试图将-i file.mp4输出到某个地方时:我得到"moov原子未找到“，因此(2)不能读取或打开(1)。

我错过了什么

在(1)中，-movflags +faststart似乎没有解决这个问题

···编辑:关于上下文···

我使用的是openvidu : webrtc和kurento和co回合。

在聊天过程中，记录功能动态地创建一个.mp4。

要开始录制，我可以对服务器进行API调用，当所有用户离开聊天室或执行其他api调用来停止时，它都会自动停止。请参阅此链接https://docs.openvidu.io/en/2.17.0/advanced-features/recording/中的组合视频

openvidu也有网钩。

我的问题不是如何阻止ffmpeg，而是如何让FFMPEG在mp4或其他文件生成“动态”时进行编码。

有两种选择：

选项1:单个=> 1 .webm / camare =>这个.webm ffmpeg可以在hls或RTMP =>工作时重新流。

选项2：**但问题在于“组合”视频=>，它使用ffmpeg来x11grab会话.但是没有moov的是mp4，所以ffmpeg不要用这个做任何事情。

参见此处的composed.sh脚本https://github.com/OpenVidu/openvidu/blob/master/openvidu-server/docker/openvidu-recording/scripts/composed.sh

*编辑3*

在.sh中，这是创建mp4的部分

ffmpeg -y -f alsa -i脉冲-f x11grab -draw_mouse 0 -framerate $FRAMERATE -video_size $RESOLUTION -i :$DISPLAY_NUM -c:a -c:a -c:v libx264 -c:v-c:v 28 -c:v-c:v 4 en0 20 en22 en0#

我如何修改它以获得更好的结果示例VP8或具有良好质量的.webm的VP9，以便ffpmeg第二个命令(2)可以对其进行实时编码.

编辑4*

我试了30秒，突然停了下来

    <./stop ffmpeg -y -f alsa -i pulse -f 
x11grab -draw_mouse 0 -framerate $FRAMERATE 
-video_size $RESOLUTION -i :$DISPLAY_NUM 
-c:v libx264 -b:v 1396k -b:a 128k -ar 44100 -maxrate 1369k 
-pix_fmt yuv420p -preset veryfast -tune zerolatency 
-c:a aac -ac 2 -profile:v main -flags -global_header 
-bufsize 969k -hls_time 1 -hls_list_size 0 -g 30 
-start_number 0 -streaming 1 -hls_playlist 1 
-lhls 1 -hls_playlist_type event -f hls "/recordings/$VIDEO_ID/$VIDEO_NAME".m3u8


N: [pulseaudio] main.c: Running in system mode, forcibly disabling SHM mode.
N: [pulseaudio] main.c: Running in system mode, forcibly disabling exit idle time.
Display in use -> :99
----------------------------------------
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
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, alsa, from 'pulse':
  Duration: N/A, start: 1617150428.783763, bitrate: 1536 kb/s
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[x11grab @ 0x55e88a4e8780] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #1, x11grab, from ':99':
  Duration: N/A, start: 1617150428.837799, bitrate: N/A
    Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x55e88a4f70c0] max bitrate less than average bitrate, assuming CBR
[libx264 @ 0x55e88a4f70c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x55e88a4f70c0] profile Main, level 4.0
[alsa @ 0x55e88a4c2e40] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619940.ts' for writing
Output #0, hls, to '/recordings/13391978436095-2/rec13390362561994.m3u8':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (libx264), yuv420p(progressive), 1920x1080, q=-1--1, 1396 kb/s, 30 fps, 90k tbn, 30 tbc
    Metadata:
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 1369000/0/1396000 buffer size: 969000 vbv_delay: -1
    Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.54.100 aac
frame=   16 fps=0.0 q=21.0 size=N/A time=00:00:00.53 bitrate=N/A speed=1.06x    
frame=   31 fps= 31 q=16.0 size=N/A time=00:00:01.03 bitrate=N/A speed=1.02x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619941.ts' for writing
frame=   47 fps= 31 q=21.0 size=N/A time=00:00:01.56 bitrate=N/A speed=1.03x    
frame=   62 fps= 30 q=22.0 size=N/A time=00:00:02.06 bitrate=N/A speed=1.02x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619942.ts' for writing
frame=   77 fps= 30 q=24.0 size=N/A time=00:00:02.56 bitrate=N/A speed=1.01x    
frame=   92 fps= 30 q=22.0 size=N/A time=00:00:03.06 bitrate=N/A speed=0.999x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619943.ts' for writing
frame=  108 fps= 30 q=29.0 size=N/A time=00:00:03.60 bitrate=N/A speed=   1x    
frame=  124 fps= 30 q=21.0 size=N/A time=00:00:04.13 bitrate=N/A speed=1.01x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619944.ts' for writing
frame=  139 fps= 30 q=20.0 size=N/A time=00:00:04.63 bitrate=N/A speed=1.01x    
frame=  154 fps= 30 q=18.0 size=N/A time=00:00:05.13 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619945.ts' for writing
frame=  169 fps= 30 q=19.0 size=N/A time=00:00:05.63 bitrate=N/A speed=   1x    
frame=  185 fps= 30 q=19.0 size=N/A time=00:00:06.16 bitrate=N/A speed=1.01x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619946.ts' for writing
frame=  199 fps= 30 q=20.0 size=N/A time=00:00:06.63 bitrate=N/A speed=   1x    
frame=  215 fps= 30 q=19.0 size=N/A time=00:00:07.16 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619947.ts' for writing
frame=  230 fps= 30 q=19.0 size=N/A time=00:00:07.66 bitrate=N/A speed=   1x    
frame=  242 fps= 30 q=18.0 size=N/A time=00:00:08.06 bitrate=N/A speed=0.99x    
frame=  254 fps= 29 q=17.0 size=N/A time=00:00:08.46 bitrate=N/A speed=0.979x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619948.ts' for writing
frame=  276 fps= 30 q=17.0 size=N/A time=00:00:09.20 bitrate=N/A speed=1.01x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec133903625619949.ts' for writing
frame=  290 fps= 30 q=21.0 size=N/A time=00:00:09.66 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199410.ts' for writing
frame=  306 fps= 30 q=31.0 size=N/A time=00:00:10.20 bitrate=N/A speed=   1x    
frame=  322 fps= 30 q=21.0 size=N/A time=00:00:10.73 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199411.ts' for writing
frame=  337 fps= 30 q=21.0 size=N/A time=00:00:11.23 bitrate=N/A speed=   1x    
frame=  352 fps= 30 q=19.0 size=N/A time=00:00:11.73 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199412.ts' for writing
frame=  367 fps= 30 q=19.0 size=N/A time=00:00:12.23 bitrate=N/A speed=   1x    
frame=  382 fps= 30 q=18.0 size=N/A time=00:00:12.73 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199413.ts' for writing
frame=  397 fps= 30 q=18.0 size=N/A time=00:00:13.23 bitrate=N/A speed=   1x    
frame=  412 fps= 30 q=18.0 size=N/A time=00:00:13.73 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199414.ts' for writing
frame=  428 fps= 30 q=18.0 size=N/A time=00:00:14.26 bitrate=N/A speed=   1x    
frame=  443 fps= 30 q=17.0 size=N/A time=00:00:14.76 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199415.ts' for writing
frame=  458 fps= 30 q=18.0 size=N/A time=00:00:15.26 bitrate=N/A speed=   1x    
frame=  474 fps= 30 q=17.0 size=N/A time=00:00:15.80 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199416.ts' for writing
frame=  489 fps= 30 q=18.0 size=N/A time=00:00:16.30 bitrate=N/A speed=   1x    
frame=  504 fps= 30 q=17.0 size=N/A time=00:00:16.80 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199417.ts' for writing
frame=  520 fps= 30 q=20.0 size=N/A time=00:00:17.33 bitrate=N/A speed=   1x    
frame=  535 fps= 30 q=18.0 size=N/A time=00:00:17.83 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199418.ts' for writing
frame=  551 fps= 30 q=20.0 size=N/A time=00:00:18.36 bitrate=N/A speed=   1x    
frame=  566 fps= 30 q=19.0 size=N/A time=00:00:18.86 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199419.ts' for writing
frame=  581 fps= 30 q=20.0 size=N/A time=00:00:19.36 bitrate=N/A speed=   1x    
frame=  596 fps= 30 q=19.0 size=N/A time=00:00:19.86 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199420.ts' for writing
frame=  612 fps= 30 q=21.0 size=N/A time=00:00:20.40 bitrate=N/A speed=   1x    
frame=  626 fps= 30 q=20.0 size=N/A time=00:00:20.86 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199421.ts' for writing
frame=  641 fps= 30 q=21.0 size=N/A time=00:00:21.37 bitrate=N/A speed=   1x    
frame=  657 fps= 30 q=35.0 size=N/A time=00:00:21.90 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199422.ts' for writing
frame=  672 fps= 30 q=33.0 size=N/A time=00:00:22.40 bitrate=N/A speed=   1x    
frame=  687 fps= 30 q=23.0 size=N/A time=00:00:22.90 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199423.ts' for writing
frame=  703 fps= 30 q=23.0 size=N/A time=00:00:23.43 bitrate=N/A speed=   1x    
frame=  718 fps= 30 q=25.0 size=N/A time=00:00:23.93 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199424.ts' for writing
frame=  733 fps= 30 q=27.0 size=N/A time=00:00:24.44 bitrate=N/A speed=   1x    
frame=  749 fps= 30 q=26.0 size=N/A time=00:00:24.96 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199425.ts' for writing
frame=  764 fps= 30 q=28.0 size=N/A time=00:00:25.46 bitrate=N/A speed=   1x    
frame=  780 fps= 30 q=27.0 size=N/A time=00:00:26.00 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199426.ts' for writing
frame=  795 fps= 30 q=27.0 size=N/A time=00:00:26.50 bitrate=N/A speed=   1x    
frame=  810 fps= 30 q=26.0 size=N/A time=00:00:27.00 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec1339036256199427.ts' for writing
frame=  825 fps= 30 q=29.0 size=N/A time=00:00:27.50 bitrate=N/A speed=   1x    
[hls @ 0x55e88a4f3040] Opening '/recordings/13391978436095-2/rec13390362561994.m3u8.tmp' for writing
frame=  840 fps= 30 q=30.0 Lsize=N/A time=00:00:28.01 bitrate=N/A speed=   1x    
video:4635kB audio:404kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[libx264 @ 0x55e88a4f70c0] frame I:42    Avg QP:12.88  size: 28020
[libx264 @ 0x55e88a4f70c0] frame P:798   Avg QP:13.11  size:  4473
[libx264 @ 0x55e88a4f70c0] mb I  I16..4: 88.4%  0.0% 11.6%
[libx264 @ 0x55e88a4f70c0] mb P  I16..4:  6.6%  0.0%  0.4%  P16..4:  6.6%  1.9%  0.6%  0.0%  0.0%    skip:83.8%
[libx264 @ 0x55e88a4f70c0] coded y,uvDC,uvAC intra: 18.8% 20.1% 10.1% inter: 1.7% 2.4% 0.1%
[libx264 @ 0x55e88a4f70c0] i16 v,h,dc,p: 55% 30% 12%  4%
[libx264 @ 0x55e88a4f70c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 27% 31%  2%  3%  2%  2%  1%  2%
[libx264 @ 0x55e88a4f70c0] i8c dc,h,v,p: 77%  9% 12%  1%
[libx264 @ 0x55e88a4f70c0] Weighted P-Frames: Y:1.1% UV:0.1%
[libx264 @ 0x55e88a4f70c0] kb/s:1355.98
[aac @ 0x55e88a4f8440] Qavg: 40876.258
jq: error (at <stdin>:1): Cannot iterate over null (null)
jq: error (at <stdin>:1): Cannot iterate over null (null)
jq: error (at <stdin>:1): null (null) cannot be parsed as a number
jq: error (at <stdin>:1): null (null) cannot be parsed as a number
jq: error: syntax error, unexpected '|' (Unix shell quoting issues?) at <top-level>, line 1:
.hasAudio=false | .hasVideo=false | .duration= | .size= | .status="failed"                                               
jq: 1 compile error
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
Invalid duration specification for ss: -i

编辑5*

不，妈妈我选择什么格式，在20到30秒后就停止了。与.webm .mov .264相同的行，当它不是.mp4，ffmpeg时似乎会下降

ffmpeg

x11

回答 1

Stack Overflow用户

回答已采纳

发布于 2021-04-03 00:00:00

有了这些变化，我就能获得3到4个稳定的延迟;)

第79行

https://github.com/OpenVidu/openvidu/blob/master/openvidu-server/docker/openvidu-recording/scripts/composed.sh

我代替了

-c:a aac -c:v libx264 -preset ultrafast -crf 28 -refs 4 -qmin 4 -pix_fmt yuv420p

使用

-c:a aac -c:v libx264 -movflags +dash 
-preset ultrafast -crf 28 -refs 4 -qmin 4 
-pix_fmt yuv420p -tune zerolatency -c:a aac -ac 2 
-profile:v main -flags -global_header 
-bufsize 969k -hls_time 2 -hls_list_size 0 -g 30 
-start_number 0 -streaming 1 -hls_playlist 1 
-lhls 1 -hls_playlist_type event -f hls

备注

-movflags +dash =>在某种程度上起到了帮助(我没有一个完整的解释，但我注意到一个微小的差异帮助了.)

-tune zerolatency => ffmpeg x264预置流

-profile:v main =>配置文件main也是专门用于流的。

-lhls 1 =>启用低延迟HLS

*还有，我不得不等待MP4出现，在M3U8中创建一个SYMLINC，以便在safari中播放

while [ ! -f __path_to.mp4 ] ; do sleep 1 ; done ; ln -s __path_to.mp4 __path_to.m3u8;

*在这种特殊情况下，重要的注释:最后的扩展必须保持为.mp4，因为如果我将其更改为.m3u8 ===>>，我真的不知道为什么，但几秒钟后它就停止了(可能是因为x11grab？？)

···关于播放器的代码，请参见以下代码：hls.js starting a beginning with ANDROID mobile (chrome, webview also) and not live *** but works very nice in deskto, ios .. hls.js 1.0.0 2021-04-01

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/66837454

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