video - FFMPEG 间歇性故障读取实时 RTMP 流

Question

命令

我正在尝试读取实时 RTMP 流并使用以下命令将结果保存到文件中:

ffmpeg -re -rtmp_live live -y -i "rtmp://<server>/<app>/<stream>" -c copy -f flv /tmp/dump.flv

我运行此命令，然后在 10-15 秒后终止进程并检查 /tmp/dump.flv .我正在尝试为流诊断目的执行此操作(确定实时流的编码、比特率、分辨率、像素格式和关键帧间隔)

此命令大约有 25-50% 的时间有效。当它工作时，FFMPEG 需要大约 5 秒来连接到流，然后它开始将数据转储到磁盘。杀死进程后，我可以在 /tmp/dump.flv 中找到几兆字节的视频数据。可以使用 ffprobe 进行探测.

当命令失败时，它会进入以下两种失败状态之一:

故障状态 1

stderr 充斥着一系列关于“大小为 X 的访问单元中缺少图片”的消息，以及输出文件 /tmp/dump.flv已创建但包含 0 个字节

ffmpeg version 3.4.4-1~16.04.york0 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  configuration: --prefix=/usr --extra-version='1~16.04.york0' --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
[NULL @ 0x55b72d568920] pps_id 381 out of range
[AVBSFContext @ 0x55b72d5692c0] Invalid NAL unit 0, skipping.
    Last message repeated 1 times
[h264 @ 0x55b72d568920] Invalid NAL unit 0, skipping.
    Last message repeated 1 times
[h264 @ 0x55b72d568920] no frame!
[h264 @ 0x55b72d568920] missing picture in access unit with size 2200
[AVBSFContext @ 0x55b72d5692c0] Invalid NAL unit 0, skipping.
    Last message repeated 2 times
[h264 @ 0x55b72d568920] Invalid NAL unit 0, skipping.
    Last message repeated 2 times
[h264 @ 0x55b72d568920] no frame!
[h264 @ 0x55b72d568920] missing picture in access unit with size 3171
[AVBSFContext @ 0x55b72d5692c0] Invalid NAL unit 0, skipping.
[h264 @ 0x55b72d568920] Invalid NAL unit 0, skipping.
[h264 @ 0x55b72d568920] no frame!
[NULL @ 0x55b72d568920] missing picture in access unit with size 80572
[h264 @ 0x55b72d568920] missing picture in access unit with size 1560
[h264 @ 0x55b72d568920] missing picture in access unit with size 2608
[h264 @ 0x55b72d568920] non-existing PPS 0 referenced
[h264 @ 0x55b72d568920] missing picture in access unit with size 2734
[h264 @ 0x55b72d568920] missing picture in access unit with size 2885
[h264 @ 0x55b72d568920] missing picture in access unit with size 77739
[h264 @ 0x55b72d568920] non-existing PPS 254 referenced
[h264 @ 0x55b72d568920] missing picture in access unit with size 3360
[h264 @ 0x55b72d568920] missing picture in access unit with size 2804
[h264 @ 0x55b72d568920] missing picture in access unit with size 3051
[h264 @ 0x55b72d568920] missing picture in access unit with size 3067
[h264 @ 0x55b72d568920] missing picture in access unit with size 77693
[h264 @ 0x55b72d568920] non-existing PPS 0 referenced
[h264 @ 0x55b72d568920] missing picture in access unit with size 2421
[h264 @ 0x55b72d568920] missing picture in access unit with size 2779
[h264 @ 0x55b72d568920] missing picture in access unit with size 2442
[h264 @ 0x55b72d568920] missing picture in access unit with size 2678
[h264 @ 0x55b72d568920] missing picture in access unit with size 76877
[h264 @ 0x55b72d568920] sps_id 15 out of range
[h264 @ 0x55b72d568920] missing picture in access unit with size 1342
[h264 @ 0x55b72d568920] missing picture in access unit with size 2412
[h264 @ 0x55b72d568920] missing picture in access unit with size 2238
[h264 @ 0x55b72d568920] missing picture in access unit with size 3550
[h264 @ 0x55b72d568920] missing picture in access unit with size 3075
...
(after hitting Ctrl+C:)
Input #0, flv, from 'rtmp://<server>/<app>/<stream>':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 00:00:00.00, start: 5285.919000, bitrate: N/A
    Stream #0:0: Video: h264 (Constrained Baseline), yuv420p, 1920x1080, 2543 kb/s, 24 fps, 24 tbr, 1k tbn, 48 tbc
Output #0, flv, to '/tmp/dump.flv':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (Constrained Baseline) ([7][0][0][0] / 0x0007), yuv420p, 1920x1080, q=2-31, 2543 kb/s, 24 fps, 24 tbr, 1k tbn, 1k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Exiting normally, received signal 2.

故障状态 2

消息“未找到起始代码”。显示，FFMPEG 在不到半秒后立即终止。发生这种情况时，文件 /tmp/dump.flv未创建。

ffmpeg version 3.4.4-1~16.04.york0 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  configuration: --prefix=/usr --extra-version='1~16.04.york0' --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
[NULL @ 0x56274b0be920] missing picture in access unit with size 3710
[AVBSFContext @ 0x56274b0bf2c0] No start code is found.
rtmp://<server>/<app>/<stream>: could not find codec parameters
Input #0, flv, from 'rtmp://<server>/<app>/<stream>':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264, none, 2543 kb/s, 24 fps, 1k tbn
Output #0, flv, to '/tmp/dump.flv':
Output file #0 does not contain any stream

我试过的

添加或删除 -re尝试将输入帧速率限制为源帧速率

添加或删除 -rtmp_live live

添加或删除 -timeout 5 (或任何其他超时值)

使用 RTMP URL 参数(例如 -i "rtmp://<server>/<app>/<stream> live=1 timeout=5" )

有谁知道为什么这个命令的成功如此断断续续，或者我怎样才能得到更一致的结果？

替代可接受的解决方案

我使用 ffmpeg 的唯一原因完全将流转储到临时文件是因为我计划对文件执行多项测试(目前至少两个测试——一个用于获取编码，另一个用于获取关键帧间隔)。通过下载流，我减少了带宽使用并减少了运行时间。然而，放弃 ffmpeg 是完全可以接受的。只需使用 ffprobe如果有帮助，请直接在 RTMP URL 上。

请注意，我确实尝试过这个，我得到了相同的两个失败状态 ffprobe

Answer 1

在我的 RTMP 服务器上使用 Red5 v5.0.1 时，我遇到了这些错误。更新到 Red5 v5.2.0 解决了这些问题。这只是他们服务器中的一个错误。不知道出了什么问题，但现在好多了。