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• ios http live black screen

  11 mars 2013, par jagsler

  In my ios app I am trying to play videos using http live streaming. The playing goes well until I decide to use the scrubber and skip to some point that hasn't buffered yet. From that moment the audio goes on but the videos goes black.

  I've converted my .MP4 videos with the following command :

  avconv -y -i video.mp4 -f mpegts -acodec libmp3lame -ar 48000 -ab 64k -s 640x480 -vcodec libx264 -b 64k -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 0 -refs 0 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate 64k -bufsize 64k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 30 -qmax 51 -qdiff 4 -level 30 -aspect 640:480 -g 30 -async 2 sample_64.ts

  I did this with multiple bitrates (64, 150, 240, 440 and 640) and created one .m3u8 that contains the different streams. After converting I used the mediafilesegmenter to split the video in segments of each 10 seconds.

  After scrubbing the following appears in the output window :

  2013-03-08 17:30:21.827 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: Disabling autoplay for pause
  
  2013-03-08 17:30:21.827 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: Disabling autoplay
  
  2013-03-08 17:30:21.977 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: _streamUnlikelyToKeepUp: 1 -> 0
  
  2013-03-08 17:30:21.978 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: Skipping autoplay, disabled (for current item: 1, on player: 0)
  
  2013-03-08 17:30:21.978 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: _streamRanDry: 0 -> 1
  
  2013-03-08 17:30:21.980 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: Took background task assertion (32) for playback stall
  
  2013-03-08 17:30:21.981 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: Skipping autoplay, disabled (for current item: 1, on player: 0)
  
  2013-03-08 17:30:22.634 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: _streamUnlikelyToKeepUp: 0 -> 0
  
  2013-03-08 17:30:22.634 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: _streamRanDry: 0 -> 1
  
  2013-03-08 17:30:22.667 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: Skipping autoplay, disabled (for current item: 1, on player: 0)
  
  2013-03-08 17:30:22.769 Geschiedenis Trainer[88129:19a03] [MPAVController] Autoplay: Ending background task assertion (32) for playback stall

  The code for my videoplayer :

  self.streamPlayer = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
  
  [self.view addSubview:self.streamPlayer.view];
  
  [self.streamPlayer setFullscreen:YES animated:YES];

  This problem does not occur when skipping to a point that has already been buffered.

• ffmpeg mp4 compress [closed]

  11 mars 2013, par Марин-Мемо Митрев

  I was on a vacation with friends and we made lot of videos with a GoPro camera... We did 40GB of videos... So could you help me compress them with ffmpeg. The sound can be at the worst quality but the video must be at above 480p.
  The idea is that I have linux server only with command line to convert them(otherwise I would do it all by myself) Info about untouched videos bellow.
  I know that I will be voted with very much minuses on the question but worth a try posting here...

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'GOPR0524.MP4':
  
    Metadata:
  
      major_brand     : avc1
  
      minor_version   : 0
  
      compatible_brands: avc1isom
  
      creation_time   : 2013-02-27 13:20:19
  
    Duration: 00:00:09.20, start: 0.000000, bitrate: 15435 kb/s
  
      Stream #0.0(eng): Video: h264 (Main), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 15278 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Metadata:
  
        creation_time   : 2013-02-27 13:20:19
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        creation_time   : 2013-02-27 13:20:19
  
  At least one output file must be specified

• FFmpeg compile error

  7 octobre 2014, par CaptainCook

  I get an error when compiling my project ffmpeg. I followed this guide : TheGuide.

  When I execute the command make I get this error message :

  AS  libavcodec/arm/mlpdsp_armv5te.o
  
  libavcodec/arm/mlpdsp_armv5te.S:88:9: error: unknown directive
  
          .hword (60f - 0b) / 2, (61f - 0b) / 2, (62f - 0b) / 2, (63f - 0b) / 2, (64f - 0b) / 2
  
  ...
  
  make: *** [libavcodec/arm/mlpdsp_armv5te.o] Error 1

  I do develop on a MAC with OS X mavericks.