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• FFmpeg settings to convert MTS into MPG for YouTube

  17 juin 2013, par JJD

  I would like to discuss the optimal parameters for FFmpeg to convert an MTS video file with the following profile for the upload onto YouTube. YouTube published their suggested resolutions and bitrates settings.

  // Input video profile
  
  Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, s16, 256 kb/s

  Since YouTube has length restrictions to the videos I also want to cut the original file into pieces.

  Here is my current configuration to convert a video. I am running Ubuntu 10.10. with FFmpeg version git-2011-12-31-81980bf.

  ffmpeg -ss 00:15:00 -i input.mts -t 00:30:00 -vcodec libx264 -deinterlace -s hd720 -ab 128k -threads 0 output.mp4

  I also want to reencode the video since I do not want to upload the large files of the original recording.

• x264 num_units_in_tick can not be correctly set

  3 mai 2012, par MIKU_LINK_SUCCESS

  When I use x264 lib to encode yuv video stream,I can not set the sps parameter num_units_in_tick(i_num_units_in_tick in struct). I init the x264_param_t as :

      x264_param_t*                     m_x264Param;
  
  
  
      if( x264_param_default_preset( m_x264Param, "superfast", "zerolatency" ) < 0 )
  
      return -1;
  
  
  
     x264_param_apply_fastfirstpass( m_x264Param );
  
  
  
      /* Apply profile restrictions. */
  
      //baseline
  
      if( x264_param_apply_profile( m_x264Param, "baseline" ) < 0 )
  
        return -1;

  The i_rc_method is set to 1. I set the parameters which decide the num_units_in_tick,then call x264_encoder_open to get x264_t .

      m_x264Param->i_timebase_den = 90000;
  
      m_x264Param->i_timebase_num = 3000;
  
      m_x264Param->i_fps_num = 60;
  
      m_x264Param->i_fps_den = 2;

  But, num_units_in_tick is still 1, and time_scale is still 60. How can I set num_units_in_tick to 3000, so one frame occupies 3000 timestamp unit.

• Generating 64kbps audio-only mpegts for HTTP Live segmenter to meept 64kbps audio only requirement

  23 avril 2012, par Pobre

  I am trying to convert our mp4 files into mpeg-ts and segment it into .ts files for my iphone app to play. I am using Carson McDonalds's HTTP-Live-Video-Stream-Segmenter-and-Distributor to do that.

  I got his stuff complied and working correctly. I am currently trying to meet Apple's requirement where I need to provide a baseline 64 kbps audio only stream to my m3u8 playlist.
  Carson doesn't seem to have a profile for that.

  I need to be able to generate 64kbps audio-only stream from mp4, and turn that into mpeg-ts for the segmenter into ts. I am trying to find the right ffmpeg command that will validate without problem using Apple's mediastreamvalidator.

  So far I modified an existing encoding profile to try to achieve 64kbps total :

  ffmpeg -er 4 -i %s -f mpegts -acodec libmp3lame -ar 22050 -ab 32k -s 240x180 -vcodec libx264 -b 16k -flags +loop+mv4 -cmp 256 -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 64k -maxrate 16k -bufsize 16k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -aspect 4:3 -r 10 -g 30 -async 2 - | %s %s %s %s %s

  but then when I try to validate it using mediastreamvalidator, it gives error after few ts :

  Playlist Validation : OK

  Segments :

  sample_cell_4x3_64k-00001.ts :

  WARNING : Media segment exceeds target duration of 10.00 seconds by 1.30 seconds (segment duration is 11.30 seconds)

  sample_cell_4x3_64k-00002.ts :

  WARNING : Media segment exceeds target duration of 10.00 seconds by 1.40 seconds (segment duration is 11.40 seconds)

  ....
  ....

  sample_cell_4x3_64k-00006.ts :

  ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
  ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

  sample_cell_4x3_64k-00007.ts :

  ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
  ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

  ....
  ....
  Average segment duration : 10.26 seconds
  Average segment bitrate : 376797.92 bps
  Average segment structural overhead : 349242.17 bps (92.69 %)

  Is there someway I can generate this correctly with just audio which totals 64kbps and turn it into mpeg-ts ready to be segmented and validated correctly ?

  Am I approaching the problem right ?