FFMPEG-几秒钟后流停止 [英] FFMPEG- Streaming Stops after few seconds
问题描述
亲爱的社区
这是我最近几天正在处理的事情.在ffmpeg社区中进行了彻底搜索之后，我无法找到解决方案.我无法将本地flv流式传输到Facebook rtmp服务器.
This is the thing that I am dealing with, since last few days. After thorough search in the ffmpeg community, I was unable to find the solution. I am unable to Stream local flv, to facebook rtmp server.
我正在运行以下命令，将本地flv视频流式传输到Facebook的rtmp服务器，以实时流式传输本地文件.
I am running the following command to stream my local flv video to the rtmp server of Facebook for Live-Streaming of my local File.
```ffmpeg -re -i SampleM.flv -acodec libmp3lame -ar 44100 -b:a 128k -pix_fmt yuv420p -profile:v baseline -s 426x240 -bufsize 6000k -vb 400k -maxrate 1500k -deinterlace -vcodec libx264 -preset veryfast -g 30 -r 30 -f flv "rtmp://live-api.facebook.com:80/rtmp/my_key"```
不幸的是，即使阅读了ffmpeg文档，我仍然无法找到导致我遇到这种情况的问题，如下所示.
It has been a misfortune-situation that even after reading ffmpeg documentation, I have been unable to find the issue that is leading me to this situation as follows.
我仍然缺少我需要知道的东西.
I am still missing something that i need to know.
以下是执行上述命令的日志.
Following is the log to the execution of the above command.
```ffmpeg version N-91024-g293a6e8332 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
libavutil 56. 18.100 / 56. 18.100
libavcodec 58. 19.101 / 58. 19.101
libavformat 58. 13.102 / 58. 13.102
libavdevice 58. 4.100 / 58. 4.100
libavfilter 7. 21.100 / 7. 21.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
Input #0, flv, from '.\video.flv':
Metadata:
audiodelay : 0
canSeekToEnd : 1
creationdate : Fri Feb 03 11:52:46 2006
:
Duration: 00:00:16.92, start: 0.000000, bitrate: 316 kb/s
Stream #0:0: Audio: mp3, 22050 Hz, stereo, fltp, 40 kb/s
Stream #0:1: Video: vp6f, 1 reference frame, yuv420p, 360x288 (368x288), 266 kb/s, 25 fps, 25 tbr, 1k tbn
Stream mapping:
Stream #0:1 -> #0:0 (vp6f (native) -> h264 (libx264))
Stream #0:0 -> #0:1 (mp3 (mp3float) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
[graph_1_in_0_0 @ 0000020c0bcc4200] tb:1/22050 samplefmt:fltp samplerate:22050 chlayout:0x3
[format_out_0_1 @ 0000020c0bca2cc0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_1'
[auto_resampler_0 @ 0000020c0bca5140] ch:2 chl:stereo fmt:fltp r:22050Hz -> ch:2 chl:stereo fmt:fltp r:44100Hz
[graph 0 input from stream 0:1 @ 0000020c0c4f4600] w:360 h:288 pixfmt:yuv420p tb:1/1000 fr:25/1 sar:0/1 sws_param:flags=2
[scaler_out_0_0 @ 0000020c0c4f73c0] w:426 h:240 flags:'bicubic' interl:0
[scaler_out_0_0 @ 0000020c0c4f73c0] w:360 h:288 fmt:yuv420p sar:0/1 -> w:426 h:240 fmt:yuv420p sar:0/1 flags:0x4
[libx264 @ 0000020c0bc80600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000020c0bc80600] profile Constrained Baseline, level 3.0
[libx264 @ 0000020c0bc80600] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=2 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=7 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=30 keyint_min=3 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=1500 vbv_bufsize=6000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
Output #0, flv, to 'rtmp://live-api.facebook.com:80/rtmp/my key:
Metadata:
audiodelay : 0
canSeekToEnd : 1
creationdate : Fri Feb 03 11:52:46 2006
:
encoder : Lavf58.13.102
Stream #0:0: Video: h264 (libx264), 1 reference frame ([7][0][0][0] / 0x0007), yuv420p, 426x240, q=-1--1, 400 kb/s, 30 fps, 1k tbn, 30 tbc
Metadata:
encoder : Lavc58.19.101 libx264
Side data:
cpb: bitrate max/min/avg: 1500000/0/400000 buffer size: 6000000 vbv_delay: -1
Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, fltp, delay 1105, 128 kb/s
Metadata:
encoder : Lavc58.19.101 libmp3lame
No more output streams to write to, finishing.e=00:00:16.51 bitrate= 533.3kbits/s speed=0.992x
[flv @ 0000020c0bc97fc0] Failed to update header with correct duration.
[flv @ 0000020c0bc97fc0] Failed to update header with correct filesize.
frame= 424 fps= 25 q=-1.0 Lsize= 1153kB time=00:00:16.95 bitrate= 557.1kbits/s speed=0.997x
video:869kB audio:265kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.666647%
Input file #0 (.\video.flv):
Input stream #0:0 (audio): 649 packets read (84767 bytes); 649 frames decoded (373824 samples);
Input stream #0:1 (video): 424 packets read (566376 bytes); 424 frames decoded;
Total: 1073 packets (651143 bytes) demuxed
Output file #0 (rtmp://live-api.facebook.com:80/rtmp/my key):
Output stream #0:0 (video): 424 frames encoded; 424 packets muxed (889641 bytes);
Output stream #0:1 (audio): 649 frames encoded (747648 samples); 650 packets muxed (271673 bytes);
Total: 1074 packets (1161314 bytes) muxed
[libx264 @ 0000020c0bc80600] frame I:18 Avg QP:27.75 size: 7001
[libx264 @ 0000020c0bc80600] frame P:406 Avg QP:32.67 size: 1879
[libx264 @ 0000020c0bc80600] mb I I16..4: 39.3% 0.0% 60.7%
[libx264 @ 0000020c0bc80600] mb P I16..4: 8.3% 0.0% 2.3% P16..4: 42.2% 16.2% 4.4% 0.0% 0.0% skip:26.6%
[libx264 @ 0000020c0bc80600] final ratefactor: 28.61
[libx264 @ 0000020c0bc80600] coded y,uvDC,uvAC intra: 40.2% 33.7% 9.2% inter: 23.8% 7.5% 0.2%
[libx264 @ 0000020c0bc80600] i16 v,h,dc,p: 24% 50% 20% 6%
[libx264 @ 0000020c0bc80600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 34% 18% 5% 5% 4% 8% 4% 8%
[libx264 @ 0000020c0bc80600] i8c dc,h,v,p: 67% 24% 7% 2%
[libx264 @ 0000020c0bc80600] kb/s:418.33```
```[flv @ 0000020c0bc97fc0] Failed to update header with correct duration.
[flv @ 0000020c0bc97fc0] Failed to update header with correct filesize.```
请纠正我，日志中列出的上述错误似乎是几秒钟后视频停止流式传输的主要原因.我已经检查了延迟问题，但无论如何它们都无济于事.
Please correct me, the above error listed in the log, seems to be the main cause that the video stops streaming after few seconds. I've checked for the latency issues, But they won't help anyway.
请帮助我解决此问题.我将非常感激. :')
Please Help me to tackle this issue. I'll be very much thankful. :')
当我使用Google计算引擎而不是我自己的PC作为流服务时，流甚至更早结束.
Streaming ends even earlier, when I use Google compute engine, instead my own PC as streaming service.
推荐答案
在混合flv文件结束时，FFmpeg使用持续时间和文件大小值更新标头(位于文件开头).但是，当您进行流媒体播放时，ffmpeg无法向前搜索，因此会显示警告.
At the end of muxing a flv file, FFmpeg updates the header (at front of file) with duration and filesize values. However, when you are streaming, ffmpeg can't seek to the front, so the warnings are displayed.
您可以通过添加标志(-flvflags no_duration_filesize)来禁用此功能，例如:
You can disable this function, by adding a flag (-flvflags no_duration_filesize), e.g.:
ffmpeg -re -i SampleM.flv -acodec libmp3lame -ar 44100 -b:a 128k \
-pix_fmt yuv420p -profile:v baseline -s 426x240 -bufsize 6000k \
-vb 400k -maxrate 1500k -deinterlace -vcodec libx264 \
-preset veryfast -g 30 -r 30 -f flv \
-flvflags no_duration_filesize \
"rtmp://live-api.facebook.com:80/rtmp/my_key"
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