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• movenc : Add a new flag for writing global sidx indexes for dash

  9 août 2015, par Martin Storsjö

  movenc : Add a new flag for writing global sidx indexes for dash
  The double meaning of the faststart flag (moving a moov atom
  
  to the start of files, making them streamable, for non-fragmented
  
  files, vs inserting a global sidx index at the start of files
  
  for fragmented files) is confusing - see 40ed1cbf1 for
  
  explanation of its origins.
  Since the second meaning of the flag hasn’t been part of any
  
  libav release yet, just rename it to get rid of the confusion
  
  without any extra deprecation (which wouldn’t get rid of the
  
  potential confusion, of users adding -movflags faststart
  
  even for fragmented files, where it isn’t needed for making
  
  them "streamable").
  This gets back the old behaviour, where -movflags faststart
  
  doesn’t have any effect for fragmented files.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/movenc.c
  • [DBH] libavformat/movenc.h

• How to load my local mpd(mpeg-dash) file to online players ?

  18 août 2023, par Walter

  I am trying to use some online players to test my local mpd file, but it could't be loaded as 'file :///path-to-file' form like local urls, what's the correct format to load the file ? Or should I upload it online or so ?

  


• How to concatenate multiple init segments and chunks from the DASH video stream ?

  17 novembre 2022, par Umakant

  I'have written a dash player in python that receives chunks from the DASH server using adaptive bitrate algorithm. Once entire video streaming is over, I need to concatenate all following received segments into one single mp4 file.

  


  root@cap31:~/don# ls
chunk0-00001.m4s  chunk2-00015.m4s  chunk2-00035.m4s  chunk2-00055.m4s  chunk2-00075.m4s  chunk3-00010.m4s  chunk3-00030.m4s  chunk3-00050.m4s  chunk3-00070.m4s
chunk0-index.m4s  chunk2-00017.m4s  chunk2-00037.m4s  chunk2-00057.m4s  chunk2-00077.m4s  chunk3-00012.m4s  chunk3-00032.m4s  chunk3-00052.m4s  chunk3-00072.m4s
chunk1-00002.m4s  chunk2-00019.m4s  chunk2-00039.m4s  chunk2-00059.m4s  chunk2-00079.m4s  chunk3-00014.m4s  chunk3-00034.m4s  chunk3-00054.m4s  chunk3-00074.m4s
chunk1-index.m4s  chunk2-00021.m4s  chunk2-00041.m4s  chunk2-00061.m4s  chunk2-00081.m4s  chunk3-00016.m4s  chunk3-00036.m4s  chunk3-00056.m4s  chunk3-00076.m4s
chunk2-00003.m4s  chunk2-00023.m4s  chunk2-00043.m4s  chunk2-00063.m4s  chunk2-00083.m4s  chunk3-00018.m4s  chunk3-00038.m4s  chunk3-00058.m4s  chunk3-00078.m4s
chunk2-00005.m4s  chunk2-00025.m4s  chunk2-00045.m4s  chunk2-00065.m4s  chunk2-00085.m4s  chunk3-00020.m4s  chunk3-00040.m4s  chunk3-00060.m4s  chunk3-00080.m4s
chunk2-00007.m4s  chunk2-00027.m4s  chunk2-00047.m4s  chunk2-00067.m4s  chunk2-index.m4s  chunk3-00022.m4s  chunk3-00042.m4s  chunk3-00062.m4s  chunk3-00082.m4s
chunk2-00009.m4s  chunk2-00029.m4s  chunk2-00049.m4s  chunk2-00069.m4s  chunk3-00004.m4s  chunk3-00024.m4s  chunk3-00044.m4s  chunk3-00064.m4s  chunk3-00084.m4s
chunk2-00011.m4s  chunk2-00031.m4s  chunk2-00051.m4s  chunk2-00071.m4s  chunk3-00006.m4s  chunk3-00026.m4s  chunk3-00046.m4s  chunk3-00066.m4s  chunk3-index.m4s
chunk2-00013.m4s  chunk2-00033.m4s  chunk2-00053.m4s  chunk2-00073.m4s  chunk3-00008.m4s  chunk3-00028.m4s  chunk3-00048.m4s  chunk3-00068.m4s


  


  I tried all the solutions mentioned on following links :
https://trac.ffmpeg.org/wiki/Concatenate
ffmpeg converting m4s to mp4

  


  Most common solution was to append the cat files in mp4 :

  


  for x in *index* *-*[0-9]*.m4s; do cat $x >> output.mp4; done


  


  But this video does not play after the second init segment starts rendering resulting into video getting stuck. I believe maybe because in my case, I have multiple init segments pointing to different chunks.

  


  Hence, I'm looking for some way to get the one single mp4 video file by concatanating all these init segments and chunks correctly.