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• 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.

  


• Mpeg Dash code having compilation issues and want to know what to do after the code is built and how to play the .mpd file generated

  11 avril 2013, par niuuuu

  I'm trying to build the DashEncoder code which I downloaded from github https://github.com/slederer/DASHEncoder. Well, I followed all the instructions given in the how to compile dash file. installed Gpac n X264 and compiled both successfully. Then did make of Dashencoder and ran it as ./Dashencoder. But I found some issues in it. Got this log :

  ==========DASH ENCODER===============
  
  Unknown option in resourcefile : sql-pw :
  
  current encoder x264
  
  YES
  
  x264 encoding @ 300 kbps: Pass 1 
  
  x264: x264 --profile baseline --preset slow --verbose --fps 24 --vbv-maxrate 300 --vbv-bufsize 600 --scenecut 0 --keyint 48 --output /opt/lampp/htdocs/tests_updates/sintel_trailer_2k_480p24_300kbit.h264 /home/niu/sintel_trailer_2k_480p24.y4m >out.txt 2>&1 
  
  mkdir: cannot create directory `/opt/lampp/htdocs/tests_updates/sintel_300kbit': File exists
  
  cp: omitting directory `/opt/lampp/htdocs/tests_updates/'
  
  copy audio: cp /opt/lampp/htdocs/tests_updates/ /opt/lampp/htdocs/tests_updates/sintel_300kbit/MP4Box multiplexing Video: /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.h264  
  
  mp4box: MP4Box -add /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.h264  /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.mp4
  
  AVC-H264 import - frame size 854 x 480 at 24.000 FPS
  
  AVC Import results: 1253 samples - Slices: 27 I 1226 P 0 B - 1 SEI - 27 IDR
  
  Saving to /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.mp4: 0.500 secs Interleaving
  
  MP4Box multiplexing Audio:/opt/lampp/htdocs/tests_updates/sintel_300kbit/ 
  
  mp4box: MP4Box -add /opt/lampp/htdocs/tests_updates/sintel_300kbit/ /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.mp4
  
  Unknown input file type
  
  Unknown input file type
  
  Error importing /opt/lampp/htdocs/tests_updates/sintel_300kbit/: Bad Parameter
  
  MP4Box Cleaning ... 
  
  mp4box: MP4Box -no-sys  /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.mp4
  
  Saving /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.mp4: 0.500 secs Interleaving
  
  MP4Box segmentation: /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.h264  
  
  mp4box: MP4Box -frag 2000 -dash 2000 -rap -segment-name /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.mp4
  
  DASH-ing file: 2.00s segments 2.00s fragments single sidx per segment
  
  Spliting segments at GOP boundaries
  
  [DASH] Generating MPD at time 2013-03-16T16:40:03Z
  
  DASHing file /opt/lampp/htdocs/tests_updates/sintel_300kbit/sintel_trailer_2k_480p24_300kbit.mp4
  
  terminate called after throwing an instance of 'std::out_of_range'
  
    what():  basic_string::substr
  
  Error: Unable to open MPD file!Aborted

  Why is this error at the end ?
  and also one folder got created in my /opt/lampp/htdocs/tests_updates/sintel_300kbit.
  which has two types of files :
  27 files of .m4s extension
  1 file -sintelinit.mp4
  1 file- sintel_trailer_2k_480p24_300kbit.mp4 , which when played in vlc player played the video bt no audio ! &

  1 file- sintel_trailer_2k_480p24_300kbit.h264 which cannot be opened.

  No .mpd file was created.

  Also I want to know aft creating that .mpd file how will i be able to test it on my android client say media player.

  I am damn confused with all this happening. Please help.

• 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 ?