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• how to add a text stream (subtitle) into a .mp4 or .m4v

  12 janvier 2013, par jAckOdE

  I use ffmpeg to convert video using H264 for video encoding, and FAAC for audio encoding. The output should be .mp4 or m4v in order to play on both Android and iPhone. I want to add a subtitle STREAM to video file using ffmpeg, but the ffmpeg's documentation doesnt help much.

  Can anyone help me with this ?

• iOS Recorded Video Playback on Android

  1er mars 2015, par Nirav

  I am trying to record video from iPhone device using UIImagePickerController and able to store it in MP4 format. The same video is uploaded on the Amazon S3 cloud.

  When I try to play the same video on Android devices, it fails to play with an error, cannot play.

  I searched forums/google and found that ffmpeg should be used to compress the video before uploading. I want to do the compression on the phone itself rather than on the server. Which is the best way to achieve this ?

  Regards,

  Nirav

• Ffmpeg - Remove rotate metadata

  16 mai 2014, par Ron I

  When I extract the images from a video, the resulting images are getting rotated. The orientation of the video is correct, and the images are upside down. The metadata for the original video is 180, and also for the output file, so it looks like it is copying that data and additionally rotating 180 degrees. However, since the original video is already rotated, it is flipping the video upside down.

  I would like to remove the metadata for the output file containing the ’rotate’ command. I tried adding -vf rotate=0, but it didn’t work.

  Here is the command I am running :

  ffmpeg -i left.MOV -r 1 -f image2 left-03%d.png

  I assume this is what is throwing it off (it looks like it is copying the rotate metadata from the input file and applying it to the output file) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'left.MOV':
  
  rotate          : 180
  
  
  
  Output #0, image2, to 'left-03%d.png':
  
  
  
  Metadata:
  
        rotate          : 180

  Here’s the full output :

      ffmpeg version 2.2.1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 11 2014 22:50:35 with Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libavresample   1.  2.  0 /  1.  2.  0
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'left.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2014-05-14 16:24:27
  
      make            : Apple
  
      make-eng        : Apple
  
      encoder         : 7.1.1
  
      encoder-eng     : 7.1.1
  
      date            : 2014-05-14T09:23:48-0700
  
      date-eng        : 2014-05-14T09:23:48-0700
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
    Duration: 00:00:10.98, start: 0.000000, bitrate: 795 kb/s
  
      Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 568x320, 728 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        rotate          : 180
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
  Output #0, image2, to 'left-03%d.png':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      model-eng       : iPhone 5
  
      make            : Apple
  
      make-eng        : Apple
  
      model           : iPhone 5
  
      encoder-eng     : 7.1.1
  
      date            : 2014-05-14T09:23:48-0700
  
      date-eng        : 2014-05-14T09:23:48-0700
  
      encoder         : Lavf55.33.100
  
      Stream #0:0(und): Video: png, rgb24, 568x320, q=2-31, 200 kb/s, 90k tbn, 1 tbc (default)
  
      Metadata:
  
        rotate          : 180
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (h264 -> png)
  
  Press [q] to stop, [?] for help
  
  frame=   14 fps=0.0 q=0.0 Lsize=N/A time=00:00:14.00 bitrate=N/A dup=0 drop=315    
  
  video:1521kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -100.001411%