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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.

• FFMpeg call from Node.js Results in 127

  27 février 2013, par user2009114

  I am having an issue with running an FFMpeg execution command from a Node.js (actually a Meteor) application. From my application I am trying to run :

  /usr/local/bin/ffmpeg-i,/Users//Documents//public/sample_iTunes.mov,-async,1,-acodec,libmp3lame,-b:a,128k,-vf,scale=min(1280\, iw) :-1,-b:v,1000k,-ar,44100,-ac,2,-vcodec,libx264,-x264opts,level=3.0,-profile:v,baseline,-preset:v,superfast,-threads,0,-flags,-global_header,-map,0,-f,segment,-segment_time,10,-segment_list,stream.m3u8,-segment_format,mpegts,-segment_list_flags,live,stream%05d.ts

  However, I get this :
  Transcoder exited with code 127
  chdir() : No such file or directory

  I am using a modified version of hls-vod module (https://github.com/mifi/hls-vod/). I have already tried changing the permissions of ffmpeg via chmod 777, as well as the /cache folder to which it encodes and the public folder containing the sample.mov. None of this seems to work. I installed FFmpeg using Homebrew so the usr/local/bin/ffmpeg is actually a sym link to usr/local/Cellar/..../ffmpeg. I don't know if this would play a part in it. Or perhaps it is something about Meteor.

  Any help would be much appreciated, thanks !

• ffmpeg m3u8 segment file and relative path for file names

  15 mars 2013, par Luuk D. Jansen

  This must be a simple issue, but I have a difficulty with the M3U8 file created by FFMPEG as it contains the absolute path to the files, and not just the file names which I need. I am trying to be able to view the stream while it is encoded, and this seems the last hurdle.

  My FFMPEG command is (ignore the comma's) :

  ffmpeg, -i, /Users/User/Documents/Java/server/data/media/1/1/Promo-2013.mov, -dn, -y, -f, mpegts, -c:a, libfdk_aac, -strict, -2, -ar, 48000, -b:a, 128000, -s, 640x360, -c:v, libx264, -b:v, 700000, -aspect, 640:360, -r, 25, -level, 3.0, -vprofile, baseline, -flags, +loop, -cmp, chroma, -coder, 0, -me_range, 16, -keyint_min, 25, -sc_threshold, 40, -i_qfactor, 0.71, -bt, 200k, -maxrate, 700000, -bufsize, 700000, -rc_eq, 'blurCplx^(1-qComp)', -qcomp, 0.6, -qmin, 10, -qmax, 51, -qdiff, 4, -level, 30, -g, 30, -async, 2, -partitions, +parti4x4+partp8x8+partb8x8, -subq, 5, -trellis, 1, -refs, 1, -vbsf, h264_mp4toannexb, -flags, -global_header, -map, 0, -f, segment, -segment_time, 10, -segment_list, /Users/User/Documents/Java/server/data/media/1/3/prog_index.m3u8, -segment_list_flags, +live, -segment_format, mpegts, /Users/User/Documents/Java/server/data/media/1/3/segment_%05d.ts

  The resulting file is :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXT-X-TARGETDURATION:12
  
  #EXTINF:10.005333,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00000.ts
  
  #EXTINF:11.952000,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00001.ts
  
  #EXTINF:10.002667,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00002.ts
  
  #EXTINF:10.008000,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00003.ts
  
  #EXTINF:0.266667,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00004.ts
  
  #EXT-X-ENDLIST

  It all works perfect, but I only want e.g. 'segment_00000.ts, and not the complete absolute path, as that is of no use for live streaming. As this is a very ordinary application, I must do something wrong.