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• avformat/matroskaenc : Don't waste bytes on length fields

  29 décembre 2019, par Andreas Rheinhardt

  avformat/matroskaenc : Don't waste bytes on length fields
  Several EBML Master elements for which a good upper bound of the final
  
  length was available were nevertheless written without giving an
  
  upper bound of the final length to start_ebml_master(), so that their
  
  length fields were eight bytes long. This has been changed.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c
  • [DH] tests/fate/wavpack.mak
  • [DH] tests/ref/fate/aac-autobsf-adtstoasc
  • [DH] tests/ref/fate/matroska-flac-extradata-update
  • [DH] tests/ref/fate/rgb24-mkv
  • [DH] tests/ref/fate/webm-dash-chapters
  • [DH] tests/ref/lavf-fate/av1.mkv
  • [DH] tests/ref/lavf/mka
  • [DH] tests/ref/lavf/mkv
  • [DH] tests/ref/lavf/mkv_attachment
  • [DH] tests/ref/seek/lavf-mkv

• Add custom metadata tag to video file without altering anything else

  9 juin 2020, par salgarji

  I'm modifying DASH-formatted segments, and my aim is to add extra information to the video segment using metadata tags.

  



  I'm using ffmpeg to record video from my webcam and store segments named like : init-video0-0.mp4 for the initial and video-0-0-N.mp4 for the following, where N is the segment number (beginning at N=1).

  



  For ffmpeg to 'understand' video files, they must have a playable video file format, for that purpose I concat initial segment with Nth segment :

  



  cat init-video-0-mp4 video0-0-N.mp4 > video0-0-N_mod.mp4


  



  Once I have a proper/correct file, I can use ffmpeg to add tags.
I've tried the following command :

  



  ffmpeg -y -i /path/to/file.mp4 -movflags use_metadata_tags -metadata customtag='whatEverYouWantToAdd' /path/to/new/file.mp4


  



  My problem is that the ffmpeg modifies the file changing other information regarding start, duration, progressive and fragmented flags...

  



  I've used this tool : https://download.tsi.telecom-paristech.fr/gpac/mp4box.js/filereader.html, to analyze my files in a more intuitive way :

  



  

  



  Do you have any clue on how to add tags without altering DASH segments in any other way ? Even if it requires using another tool different from ffmpeg.

  



  Thank you in advance !

  


• One liner to create HLS stream

  29 avril 2015, par hendry

  IIUC with HLS or DASH, I can create a manifest and serve the segments straight from my httpd, e.g. python -m http.server.

  I have a UVC video feed coming in on /dev/video1 and I’m battling to create a simple m3u8 in either gstreamer or ffmpeg.

  I got as far as :

  gst-launch-1.0 -e v4l2src device=/dev/video1 ! videoconvert ! x264enc ! mpegtsmux ! hlssink max-files=5

  Any ideas ?