次のコマンドを使用してffmpegを使用してストリーミングエンジン（nginx-rtmp）にビデオをストリーミングしています。
ffmpeg -re -fflags +genpts -stream_loop -1 -i Sintel.mp4 -c copy -f flv rtmp://stream-engine/myStream
しかし私がやっているとき ffprobe このストリームのうち、ストリーミングエンジンに直接送信されるもので、ストリームにビデオがない場合があります。
ストリームをテストするためのコマンド： ffprobe -loglevel 'debug' rtmp://stream-engine/mystream
95％以下のような出力が得られます。
ffprobe version 3.0.2 Copyright (c) 2007-2016 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.38)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libvorbis --enable-libvpx --enable-vda
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
[rtmp @ 0x7ff57e4028a0] No default whitelist set
[tcp @ 0x7ff57e402d40] No default whitelist set
[rtmp @ 0x7ff57e4028a0] Handshaking...
[rtmp @ 0x7ff57e4028a0] Type answer 3
[rtmp @ 0x7ff57e4028a0] Server version 13.14.10.13
[rtmp @ 0x7ff57e4028a0] Proto = rtmp, path = /source/myStream, app = source, fname = myStream
[rtmp @ 0x7ff57e4028a0] Server bandwidth = 5000000
[rtmp @ 0x7ff57e4028a0] Client bandwidth = 5000000
[rtmp @ 0x7ff57e4028a0] New incoming chunk size = 4096
[rtmp @ 0x7ff57e4028a0] Creating stream...
[rtmp @ 0x7ff57e4028a0] Sending play command for 'myStream'
[flv @ 0x7ff57f002e00] Format flv probed with size=2048 and score=100
[flv @ 0x7ff57f002e00] Before avformat_find_stream_info() pos: 13 bytes read:2266 seeks:0
[flv @ 0x7ff57f002e00] Unknown type |RtmpSampleAccess
[flv @ 0x7ff57f002e00] video stream discovered after head already parsed
[h264 @ 0x7ff580000000] no picture
[flv @ 0x7ff57f002e00] All info found
[flv @ 0x7ff57f002e00] rfps: 23.750000 0.014474
[flv @ 0x7ff57f002e00] rfps: 23.833333 0.006451
Last message repeated 1 times
[flv @ 0x7ff57f002e00] rfps: 23.916667 0.001640
Last message repeated 1 times
[flv @ 0x7ff57f002e00] rfps: 24.000000 0.000043
[flv @ 0x7ff57f002e00] rfps: 24.083333 0.001659
Last message repeated 1 times
[flv @ 0x7ff57f002e00] rfps: 24.166667 0.006488
Last message repeated 1 times
[flv @ 0x7ff57f002e00] rfps: 24.250000 0.014530
[flv @ 0x7ff57f002e00] rfps: 48.000000 0.000173
[flv @ 0x7ff57f002e00] rfps: 120.000000 0.001079
[flv @ 0x7ff57f002e00] rfps: 240.000000 0.004316
[flv @ 0x7ff57f002e00] rfps: 23.976024 0.000173
Last message repeated 1 times
[flv @ 0x7ff57f002e00] rfps: 47.952048 0.000694
Last message repeated 1 times
[flv @ 0x7ff57f002e00] After avformat_find_stream_info() pos: 345943 bytes read:345943 seeks:0 frames:256
Input #0, flv, from 'rtmp://stream-engine/myStream':
Metadata:
Server : NGINX RTMP (github.com/arut/nginx-rtmp-module)
displayWidth : 1280
displayHeight : 544
fps : 24
profile :
level :
Duration: 00:00:00.00, start: 186.878000, bitrate: N/A
Stream #0:0, 215, 1/1000: Audio: aac (LC), 48000 Hz, 5.1, fltp, 128 kb/s
Stream #0:1, 41, 1/1000: Video: h264 (High), 4 reference frames, yuv420p(left), 1280x544 [SAR 1:1 DAR 40:17], 1/48, 24.42 fps, 24 tbr, 1k tbn, 48 tbc
detected 4 logical cores
[AVIOContext @ 0x7ff57e60cec0] Statistics: 345943 bytes read, 0 seeks
[rtmp @ 0x7ff57e4028a0] Deleting stream...
ビデオとオーディオの両方のトラックがあります。
時間の5％は私が次のようになる：
ffprobe version 3.0.2 Copyright (c) 2007-2016 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.38)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libvorbis --enable-libvpx --enable-vda
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
[rtmp @ 0x7fe5cb407900] No default whitelist set
[tcp @ 0x7fe5cb408100] No default whitelist set
[rtmp @ 0x7fe5cb407900] Handshaking...
[rtmp @ 0x7fe5cb407900] Type answer 3
[rtmp @ 0x7fe5cb407900] Server version 13.14.10.13
[rtmp @ 0x7fe5cb407900] Proto = rtmp, path = /source/myStream, app = source, fname = myStream
[rtmp @ 0x7fe5cb407900] Server bandwidth = 5000000
[rtmp @ 0x7fe5cb407900] Client bandwidth = 5000000
[rtmp @ 0x7fe5cb407900] New incoming chunk size = 4096
[rtmp @ 0x7fe5cb407900] Creating stream...
[rtmp @ 0x7fe5cb407900] Sending play command for 'myStream'
[flv @ 0x7fe5cb800a00] Format flv probed with size=2048 and score=100
[flv @ 0x7fe5cb800a00] Before avformat_find_stream_info() pos: 13 bytes read:2288 seeks:0
[flv @ 0x7fe5cb800a00] Unknown type |RtmpSampleAccess
[flv @ 0x7fe5cb800a00] max_analyze_duration 5000000 reached at 5019000 microseconds st:0
[flv @ 0x7fe5cb800a00] After avformat_find_stream_info() pos: 87188 bytes read:87188 seeks:0 frames:241
Input #0, flv, from 'rtmp://stream-engine/myStream':
Metadata:
Server : NGINX RTMP (github.com/arut/nginx-rtmp-module)
displayWidth : 1280
displayHeight : 544
fps : 24
profile :
level :
Duration: 00:00:00.00, start: 343.593000, bitrate: N/A
Stream #0:0, 241, 1/1000: Audio: aac (LC), 48000 Hz, 5.1, fltp, 128 kb/s
[AVIOContext @ 0x7fe5cb604480] Statistics: 87188 bytes read, 0 seeks
[rtmp @ 0x7fe5cb407900] Deleting stream...
私たちは多くのオプション、多くのエンコーダを試しました。私たちは異なるストリームソース（ffmpeg、wowzaGoCoder、wirecast）と異なるストリーミングエンジン（wowza、nginx-rtmp）でそれを再現しました。いくつかの設定は再現するのを難しくしますがそれでも起こります...
同じストリームにビデオトラックを「時々」含めることができるのはどうしてですか。 何が足りないの？ どのように我々はそれをそのような（非常にイライラさせる）バグに対してより弾力的にすることができますか？
編集する
ストリームを記録し、それがビデオトラックを検出しない場合、しばらくするとビデオトラックが検出されたことを示すログが表示されますが、記録はそれなしですでに開始されているので、記録されたストリームにビデオトラックはありません。
ストリーム録画のログ ffmpeg -loglevel debug -y -i rtmp://stream-engine/myStream -c copy -f flv output.flv：
ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.38)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libvorbis --enable-libvpx --enable-vda
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-i' ... matched as input file with argument 'rtmp://stream-engine/myStream'.
Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'flv'.
Reading option 'output.flv' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Applying option y (overwrite output files) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file rtmp://stream-engine/myStream.
Successfully parsed a group of options.
Opening an input file: rtmp://stream-engine/myStream.
[rtmp @ 0x7fa1a5d00c60] No default whitelist set
[tcp @ 0x7fa1a5c0dac0] No default whitelist set
[rtmp @ 0x7fa1a5d00c60] Handshaking...
[rtmp @ 0x7fa1a5d00c60] Type answer 3
[rtmp @ 0x7fa1a5d00c60] Server version 13.14.10.13
[rtmp @ 0x7fa1a5d00c60] Proto = rtmp, path = /source/S1IwVWndb, app = source, fname = S1IwVWndb
[rtmp @ 0x7fa1a5d00c60] Server bandwidth = 5000000
[rtmp @ 0x7fa1a5d00c60] Client bandwidth = 5000000
[rtmp @ 0x7fa1a5d00c60] New incoming chunk size = 4096
[rtmp @ 0x7fa1a5d00c60] Creating stream...
[rtmp @ 0x7fa1a5d00c60] Sending play command for 'S1IwVWndb'
[flv @ 0x7fa1a6801200] Format flv probed with size=2048 and score=100
[flv @ 0x7fa1a6801200] Before avformat_find_stream_info() pos: 13 bytes read:2271 seeks:0
[flv @ 0x7fa1a6801200] Unknown type |RtmpSampleAccess
[flv @ 0x7fa1a6801200] max_analyze_duration 5000000 reached at 5019000 microseconds st:0
[flv @ 0x7fa1a6801200] After avformat_find_stream_info() pos: 87184 bytes read:87184 seeks:0 frames:241
Input #0, flv, from 'rtmp://stream-engine/myStream':
Metadata:
Server : NGINX RTMP (github.com/arut/nginx-rtmp-module)
displayWidth : 1280
displayHeight : 544
fps : 24
profile :
level :
Duration: 00:00:00.00, start: 344.126000, bitrate: N/A
Stream #0:0, 241, 1/1000: Audio: aac (LC), 48000 Hz, 5.1, fltp, 128 kb/s
Successfully opened the file.
Parsing a group of options: output file output.flv.
Applying option c (codec name) with argument copy.
Applying option f (force format) with argument flv.
Successfully parsed a group of options.
Opening an output file: output.flv.
[file @ 0x7fa1a5c1cec0] Setting default whitelist 'file,crypto'
Successfully opened the file.
Output #0, flv, to 'output.flv':
Metadata:
Server : NGINX RTMP (github.com/arut/nginx-rtmp-module)
displayWidth : 1280
displayHeight : 544
fps : 24
profile :
level :
encoder : Lavf57.25.100
Stream #0:0, 0, 1/1000: Audio: aac (LC) ([10][0][0][0] / 0x000A), 48000 Hz, 5.1, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[flv @ 0x7fa1a6801200] video stream discovered after head already parsed
[flv @ 0x7fa1a6801200] New video stream 0:1 at pos:144269 and DTS:352.667s
size= 371kB time=00:00:22.57 bitrate= 134.6kbits/s speed= 1.3x
video:0kB audio:353kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.082170%
Input file #0 (rtmp://stream-engine/myStream):
Input stream #0:0 (audio): 1058 packets read (361263 bytes);
Total: 1058 packets (361263 bytes) demuxed
Output file #0 (output.flv):
Output stream #0:0 (audio): 1058 packets muxed (361263 bytes);
Total: 1058 packets (361263 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x7fa1a5c1cf80] Statistics: 3 seeks, 1061 writeouts
[AVIOContext @ 0x7fa1a5d00fa0] Statistics: 2401247 bytes read, 0 seeks
[rtmp @ 0x7fa1a5d00c60] Deleting stream..
-analyzeduration 20M -probesize 20M前に配置-i ...