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• FFmpeg : Apple ProRes 422 (LT) to mp4

  23 juin 2016, par premunk

  I am trying to convert from Apple ProRes 422 (LT) to mp4. My input file info is :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’1. 1introduction. Mov’ :
  metadata :
  major_brand : qt
  minor_version : 537199360
  compatible_brands : qt
  creation_time : 2015-10-19 23:24:05
  duration : 00:03:27. 00, start : 0. 000000, bitrate : 48703 kb/s
  stream #0:0(eng) : video : prores (apcs / 0x73637061), yuv422p10le(bt709), 1920x1080, 47126 kb/s, sar 1:1 dar 16:9, 23. 98 fps, 23. 98 tbr, 24k tbn, 24k tbc (default)
  metadata :
  creation_time : 2015-10-19 23:24:05
  handler_name : apple alias data handler
  encoder : apple prores 422 (lt)
  timecode : 00:03:21:05
  stream #0:1(eng) : audio : pcm_s16le (sowt / 0x74776f73), 48000 hz, stereo, s16, 1536 kb/s (default)
  metadata :
  creation_time : 2015-10-19 23:24:05
  handler_name : apple alias data handler
  timecode : 00:03:21:05
  stream #0:2(eng) : data : none (tmcd / 0x64636d74) (default)
  metadata :
  creation_time : 2015-10-19 23:24:05
  handler_name : apple alias data handler
  timecode : 00:03:21:05

  Any help is appreciated. I can’t seem to find any relevant article.

• opencv cannot read MP4 file from sony camcorder

  7 juin 2016, par Jundong

  The sony camcorder recorded video in MP4 format. I am reading the file by

  import cv2
  
  vid = cv2.VideoCapture('sample.MP4')

  my OpenCV version is 2.4.8, as a Python module.

  The codec of the ’sample.MP4’ is H.264, Linear PCM.

  ffprobe sample.MP4

  returns :

  > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C0004.mp4':   Metadata:
  
  >     major_brand     : XAVC
  
  >     minor_version   : 16785407
  
  >     compatible_brands: XAVCmp42iso2
  
  >     creation_time   : 2016-06-06 13:41:51   Duration: 00:00:15.02, start: 0.000000, bitrate: 50439 kb/s
  
  >     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-4), 1920x1080 [SAR 1:1 DAR 16:9],
  
  > 48655 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  >     Metadata:
  
  >       creation_time   : 2016-06-06 13:41:51
  
  >       handler_name    : Video Media Handler
  
  >       encoder         : AVC Coding
  
  >     Stream #0:1(und): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
  >     Metadata:
  
  >       creation_time   : 2016-06-06 13:41:51
  
  >       handler_name    : Sound Media Handler
  
  >     Stream #0:2(und): Data: none (rtmd / 0x646D7472), 245 kb/s (default)
  
  >     Metadata:
  
  >       creation_time   : 2016-06-06 13:41:51
  
  >       handler_name    : Timed Metadata Media Handler 
  
  > Unsupported codec with id 0 for input stream 2

  It seems that the codec for h.264 is missing. The version of my FFmpeg is 3.0.

  I tried avconv -i sample.MP4 -c:a copy -c:v copy sample_converted.mp4 to convert the sample.MP4 to sample_converted.mp4, this command line did not work. The command ffmpeg -i sample.mp4 sample_converted.mp4 worked ; however, it compromised the video quality badly.I used an online video converter : http://www.online-convert.com/ (which output nice quality video in mp4 format, but it has size limitation for free users)
  to convert the MP4 to mp4, the command in Terminal as below :

  ffprobe 'sample_converted.mp4'

  returns

  > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C0001_converted.mp4':  
  
  > Metadata:
  
  >     major_brand     : isom
  
  >     minor_version   : 512
  
  >     compatible_brands: isomiso2avc1mp41
  
  >     encoder         : Lavf57.36.100   Duration: 00:00:02.02, start: 0.000000, bitrate: 16777 kb/s
  
  >     Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 16801 kb/s, 59.94
  
  > fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
  
  >     Metadata:
  
  >       handler_name    : VideoHandler
  
  >     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
  
  >     Metadata:
  
  >       handler_name    : SoundHandler

  Obviously, the encoders, handler_names etc. of the sample.MP4 and sample_converted.mp4 are different. Any idea using FFmpeg or OpenCV to convert this raw video from camcorder to the readable format without compromising the video quality ?

• How to disable printing video info in ffmpeg library ?

  19 mai 2016, par Kindermann

  Each time when I run my c code written with ffmpeg library, there is always some lengthy video info output in my console as follows :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MVI_9359.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537331968
  
      compatible_brands: qt  CAEP
  
      creation_time   : 2012-12-11 19:55:15
  
    Duration: 00:00:53.40, start: 0.000000, bitrate: 47283 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt709), 1920x1080, 45744 kb/s, 25 fps, 25 tbr, 25k tbn, 50k tbc (default)
  
      Metadata:
  
        creation_time   : 2012-12-11 19:55:15
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2012-12-11 19:55:15

  How can I disable this output ? I don’t need it !