FFMPEG 流式传输错误：无法使用正确的文件大小和持续时间更新标头

Question

我试图将 mp4 流式传输到本地计算机上的 vlc 播放器（IP 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 上进行流式传输时没有遇到此问题，但在 Windows PC 上却遇到了这个问题。

在我的 Mac 上，我运行 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:\Users\Oculus\AppData\Local\Temp'
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:\Users\Oculus\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\fetcher
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.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 Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.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:\Users\Oculus\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\art
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\art
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\03_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

思考为什么会发生这种情况？以及如何解决这个问题？

Answer 1

我在另一个帖子中找到了这个问题的答案。

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（在文件前面）。但是，当您进行流式传输时，ffmpeg 无法向前查找，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"

来源： FFMPEG-流媒体在几秒钟后停止

Answer 2

1. 打开 Vlc 媒体播放器
2. 按“Ctrl + N”选择“文件”选项卡，
3. 从您的电脑添加文件，
4. 在组合框中选择“流”，
5. 选择下一步在目标设置中选择“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”如果您想要任何编解码器，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