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• How to transmit videos directly from the website to RTMP server instead of using OBS ? [closed]

  28 décembre 2024, par Cường Lê Sỹ

  I had a server to receive a specific RTMP video like RTMP : //domain.com/show and use OBS to record videos, what I have to do to be able to record videos on my own website and transmit it. . Access RTMP server instead of using OBS or any code can do that, thank you

  


  I hope to be able to record videos directly on my website and play it back at the viewer page, like a livestream.

  


• Install PyAV on Windows

  16 juin 2015, par m.barz

  I got a problem building and thus setting up PyAV 32-bit on Windows 8 (x64). I tried the workflow for Windows as indicated in their documentation, but did not succeed :

  • I cross-compiled ffmpeg on Ubuntu 14.04 with the aid of a script.
  • I copied the *shared-install folder to Windows and set the PKG_CONFIG_PATH environment variable to the corresponding libs/pkgconfig path.
  • I copied the ffmpeg DLLs and its dependencies from the MinGW bin-folder to PyAV’s av folder as mentioned in PyAV’s docs.
  • I ran make build-mingw32 (where build-mingw32 is a recipe triggering python distutils like that : CFLAGS=$(CFLAGS) LDFLAGS=$(LDFLAGS) python setup.py build_ext --inplace -c mingw32)

  Finally I run into trouble with that last command. When the build process tries to create codec.pyd there is a bunch of undefined reference to _head_C_build27_cpython_PCBuild_libpython27_a errors leading gcc to fail. See cmd output below :

  

  I tried this on a fresh virtual machine running Windows 8.1 Pro having installed the MinGW toolchain including msys (I used the installer from mingw.org). I also tried the MinGW installer provided here.
  I hope someone already experienced similar issues using gcc and can help me with that !

  Thanks in advance and best regards,
  Michael

• Embedding timed text metadata in MP4

  10 juin 2015, par Steve Robinson

  Is it possible to manually embed timed text metadata into MP4 files ?
  I have a TTML / SRT file with the metadata. I just need to embed the text data without doing any encoding the video / audio.

  EDIT :
  We used to do the metadata injecting using on Wowza server which we use for live streaming. What I need to do is manually inject the metadata in to prerecorded MP4 files without running the video through Wowza.

  Here is one such video file that was processed by Wowza :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'metadata-back.mp4':
  
    Metadata:
  
      major_brand     : f4v 
  
      minor_version   : 0
  
      compatible_brands: isommp42m4v 
  
      creation_time   : 2015-04-16 11:12:39
  
    Duration: 00:00:11.70, start: 0.000000, bitrate: 1373 kb/s
  
      Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 640x480 [SAR 1:1 DAR 4:3], 1352 kb/s, 28.60 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-04-16 11:12:39
  
        handler_name    : WowzaStreamingEngine
  
        encoder         : WowzaStreamingEngine
  
      Stream #0:1(eng): Audio: speex (spex / 0x78657073), 16000 Hz, mono, s16, 17 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-04-16 11:12:39
  
        handler_name    : WowzaStreamingEngine
  
      Stream #0:2(eng): Data: none (amf0 / 0x30666D61), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-04-16 11:12:39
  
        handler_name    : WowzaStreamingEngine

  Now if I run the command ffmpeg -i new-meta.mp4 -i sub.srt -c copy -c:s mov_text -movflags +faststart out.mp4 and if I run ffmpeg -i out.mp4, I get this :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.4.101
  
    Duration: 00:00:07.27, start: 0.000000, bitrate: 925 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1366x768 [SAR 1:1 DAR 683:384], 920 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Subtitle: mov_text (tx3g / 0x67337874), 0 kb/s (default)
  
      Metadata:
  
        handler_name    : SubtitleHandler

  Now as you can see the text is embedded with a different codec (is this the right term ?). Also I dont see an audio track as well.

  Hope my question is clear enough. I need a way to embed metadata (from srt / ttml) into an MP4 video it should be embedded in amf format (again is this the right term ?)