FFMPEG 流式处理错误:无法使用正确的文件大小和持续时间更新标头

Question

我正在尝试将 mp4 流式传输到本地计算机上的 vlc 播放器，地址为 127.0.0.1：48550，但遇到此错误。

Failed to update header with correct duration.
Failed to update header with correct filesize.

我在Mac上流式传输时没有遇到此问题，但是在WindowsPC上遇到了此问题。

在我的 mac 上，我正在运行 ffmpeg 3.2.4，在 PC 上，使用 gcc 7.1.0 构建的 ffmpeg 版本 N-86755-g0780ad9

。以下是VLC媒体播放器调试日志：

core debug: adding item `udp://127.0.0.1:48550' ( udp://127.0.0.1:48550 )
core debug: processing request item: udp://127.0.0.1:48550, node: null, skip: 0
core debug: rebuilding array of current - root Playlist
core debug: rebuild done - 1 items, index 0
core debug: starting playback of the new playlist item
core debug: resyncing on udp://127.0.0.1:48550
core debug: udp://127.0.0.1:48550 is at 0
core debug: creating new input thread
core debug: Creating an input for 'udp://127.0.0.1:48550'
core debug: meta ok for (null), need to fetch art
core debug: requesting art for udp://127.0.0.1:48550
core debug: looking for meta fetcher module matching "any": 1 candidates
core debug: using timeshift granularity of 50 MiB, in path 'C:UsersOculusAppDataLocalTemp'
core debug: looking for meta fetcher module matching "any": 1 candidates
core debug: `udp://127.0.0.1:48550' gives access `udp' demux `' path `127.0.0.1:48550'
core debug: specified demux `any'
core debug: creating demux: access='udp' demux='any' location='127.0.0.1:48550' file='\127.0.0.1:48550'
core debug: looking for access_demux module matching "udp": 12 candidates
core debug: no access_demux modules matched
core debug: creating access 'udp' location='127.0.0.1:48550', path='\127.0.0.1:48550'
core debug: looking for access module matching "udp": 21 candidates
lua debug: Trying Lua scripts in C:UsersOculusAppDataRoamingvlcluametafetcher
lua debug: Trying Lua scripts in C:Program FilesVideoLANVLCluametafetcher
lua debug: Trying Lua scripts in C:UsersOculusAppDataRoamingvlcluametafetcher
lua debug: Trying Lua scripts in C:Program FilesVideoLANVLCluametafetcher
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametafetchertvrage.luac
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametafetchertvrage.luac
udp debug: opening server=127.0.0.1:48550 local=:1234
core debug: net: connecting to [127.0.0.1]:48550 from []:1234
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametafetchertvrage.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametafetchertvrage.luac
core debug: no meta fetcher modules matched
core debug: searching art for udp://127.0.0.1:48550
core debug: looking for art finder module matching "any": 2 candidates
core debug: no meta fetcher modules matched
core debug: searching art for udp://127.0.0.1:48550
core debug: looking for art finder module matching "any": 2 candidates
lua debug: Trying Lua scripts in C:UsersOculusAppDataRoamingvlcluametaart
lua debug: Trying Lua scripts in C:UsersOculusAppDataRoamingvlcluametaart
lua debug: Trying Lua scripts in C:Program FilesVideoLANVLCluametaart
lua debug: Trying Lua scripts in C:Program FilesVideoLANVLCluametaart
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametaart0_musicbrainz.luac
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametaart0_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametaart0_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametaart0_musicbrainz.luac
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametaart1_googleimage.luac
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametaart1_googleimage.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametaart1_googleimage.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametaart1_googleimage.luac
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametaart2_frenchtv.luac
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametaart2_frenchtv.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametaart2_frenchtv.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametaart2_frenchtv.luac
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametaart3_lastfm.luac
lua debug: Trying Lua playlist script C:Program FilesVideoLANVLCluametaart3_lastfm.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametaart3_lastfm.luac
lua debug: skipping script (unmatched scope) C:Program FilesVideoLANVLCluametaart3_lastfm.luac
core debug: no art finder modules matched
core debug: art not found for udp://127.0.0.1:48550
core debug: no art finder modules matched
core debug: art not found for udp://127.0.0.1:48550
core debug: using access module "udp"
core debug: Using block method for AStream*
core debug: starting pre-buffering
qt4 debug: IM: Setting an input

关于为什么会发生这种情况的想法？以及如何解决这个问题？

Answer 1

我在另一个线程中找到了这个问题的答案。

在 flv 文件复用结束时，FFmpeg 会使用持续时间和文件大小值更新标头(位于文件前面(。但是，当您流式传输时，ffmpeg 无法搜索到前面，因此会显示警告。

您可以通过添加标志(-flvflags no_duration_filesize(来禁用此功能，例如：

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"

资料来源： FFMPEG - 流式传输在几秒钟后停止

Answer 2

1. 打开 Vlc 媒体播放器
2. 按"Ctrl + N"选择"文件">选项卡，
3. 从您的 PC 添加文件，
4. 在组合框上选择"流">，
选择
5. 下一步 在目标设置上选择"RTP/MPEG 传输流">，
6. 按添加写入地址 -->"127.0.0.1"端口 --> 48550
7. 单击下一步如果要使用任何编解码器，则可以在转码选项页面上添加，如果不单击">下一步">
8. 最后点击流