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• Encoding and segmenting HD video for DASH [closed]

  13 mars 2013, par user2163937

  I am trying to encode video for implementing DASH, for encoding I am using this command line...

  ffmpeg -i sample.ts -f mpegts -acodec libfaac -ar 44100 -ab 64k -s 480x270
  
  -vcodec libx264 -b 500k -r 25 -flags +loop -partitions
  
  +parti4x4+partp8x8+partb8x8 -subq 5 -refs 6  -keyint_min 10 -i_qfactor 0.71 
  
  -maxrateD 500k -bufsize 500k -rc_eq 'blurCplx^(1-qComp)' -qmin 10 -qmax 51
  
  -qdiff 4 -level 30 -aspect 16:9 -g 30 -async 2 out.ts

  For segmentation I use this command line

  ffmpeg -i out.ts -c copy -map 0 -f ssegment -segment_time 4 -segment_list
  
  out.list seg%d.ts   

  And I use the various resolutions and parameters according to the table given in this link.

  Given resolutions and parameters are working fine for me, I can able to get smooth transition among various resolutions. But problem arises when I try to use HD resolution i.e 1280x720, there is a visible flicker when video switches from HD to other resolution or vice-versa. I cannot figure out the problem.

• Concatenate DASH audio and video to single file

  13 mars 2017, par Andreas

  First of all, I have a folder with about 200 video and audio segments (m4v and m4a) of a video that was live streamed as DASH video. Now - without having the original file - I want to concatenate those parts to a single, playable video file.

  To mention what I already tested :

  • concatenate via the Unix terminal command cat ; unfortunately this won’t help to make the video playable in any media player again
  • using ffmpeg’s merge abilities via files.txt ; with the same unsuccessful result

  I’m definitely not an expert (otherwise I probably wouldn’t ask) but the problem may be also the missing mpd and/or init file (as far as I could skim in the standard).

  Don’t get me wrong : I don’t want to get a bit to bit identical result of the original file. All I want to achieve is a single playable mp4 file of aforesaid video.

  I also tried to make a own mpd file, but the "stream" won’t play. FYI, I tried playing it in the current VLC 3.0.0 git, since the current stable versions seems not to support DASH.
  If it helps, here the video codec :

  id="live-hd_H264"
  
  mimeType="video/mp4"
  
  codecs="avc1.4d401f"
  
  width="396"
  
  height="704"

  So, can anybody help me ?

  Kind regards !

• Concatenate DASH audio and video to single file

  18 mars 2019, par Andreas

  First of all, I have a folder with about 200 video and audio segments (m4v and m4a) of a video that was live streamed as DASH video. Now - without having the original file - I want to concatenate those parts to a single, playable video file.

  To mention what I already tested :

  • concatenate via the Unix terminal command cat ; unfortunately this won’t help to make the video playable in any media player again
  • using ffmpeg’s merge abilities via files.txt ; with the same unsuccessful result

  I’m definitely not an expert (otherwise I probably wouldn’t ask) but the problem may be also the missing mpd and/or init file (as far as I could skim in the standard).

  Don’t get me wrong : I don’t want to get a bit to bit identical result of the original file. All I want to achieve is a single playable mp4 file of aforesaid video.

  I also tried to make a own mpd file, but the "stream" won’t play. FYI, I tried playing it in the current VLC 3.0.0 git, since the current stable versions seems not to support DASH.
  If it helps, here the video codec :

  id="live-hd_H264"
  
  mimeType="video/mp4"
  
  codecs="avc1.4d401f"
  
  width="396"
  
  height="704"

  So, can anybody help me ?

  Kind regards !