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• mov : Export spherical information

  11 novembre 2016, par Vittorio Giovara

  mov : Export spherical information
  This implements Spherical Video V1 and V2, as described in the
  
  spatial-media collection by Google.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DH] Changelog
  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c
  • [DH] libavformat/version.h

• ffprobe returns mov,mp4,m4a,3gp,3g2,mj2

  19 octobre 2015, par sathia

  I’m trying to find a certain way to understand if a given file is using the h.264 codec and it’s streamable.

  I’m using ffprobe and sometimes I get output such as this :

  {
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2036-02-06 06:28:16
  
      encoder         : HandBrake 0.10.2 2015060900
  
    Duration: 00:06:42.13, start: 0.000000, bitrate: 950 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 640x480 [SAR 1:1 DAR 4:3], 788 kb/s, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2036-02-06 06:28:16
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 155 kb/s (default)
  
      Metadata:
  
        creation_time   : 2036-02-06 06:28:16
  
        handler_name    : Stereo
  
      "format": {
  
          "filename": "file.mp4",
  
          "nb_streams": 2,
  
          "nb_programs": 0,
  
          "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
  
          "format_long_name": "QuickTime / MOV",
  
          "start_time": "0.000000",
  
          "duration": "402.134000",
  
          "size": "47787790",
  
          "bit_rate": "950683",
  
          "probe_score": 100,
  
          "tags": {
  
              "major_brand": "mp42",
  
              "minor_version": "512",
  
              "compatible_brands": "isomiso2avc1mp41",
  
              "creation_time": "2036-02-06 06:28:16",
  
              "encoder": "HandBrake 0.10.2 2015060900"
  
          }
  
      }
  
  }

  now, it seems that the file is streamable and it’s ok to be put online, but I was expecting something like this :

      "format_name": "h.264",

  instead I get

      "format_name": "mov,mp4,m4a,3gp,3g2,mj2",

  which seems very lax in terms of specifying what the hell this file is.
  I’m also using MP4Box in order to see if the video is streamable, but at this point I’m not sure how to handle specific h.264 recognition.

  what should I do in order to be sure that a given file has the h.264 codec ?

  thanks

• How to concat videos that have different colour spaces ?

  17 avril 2023, par Ham789

  I writing a Python program that uses subprocess to automate ffmpeg. The program concatenates many videos together with the concat filter. The problem I have is that the colour of some of the videos is very washed out in the final output. I believe this is because the videos have different colour spaces. Some are B.709 and some are B.2020. The B.2020 videos are washed out.

  


  I have tried converting the B.2020 videos to B.709 before concatenating by using the following command on each video but the outputs are still washed out :

  


  ffmpeg -i input.mov -vf colorspace=all=bt709:iall=bt2020:fast=1 output.mov


  


  It wasn't clear to me which way round the arguments should go so I also tried switching the bt2020 and bt709 terms but they still look washed out but with more saturation.

  


  Is this the right approach ? Am I missing some other arguments in order to convert the B.2020 videos to B.709 while preserving their colour ?

  


  I have attached a side by side of the original and converted video.

  


  The metadata of the videos I am trying to concat are :

  


  Video 1

  


  

  • color_range=tv

  


  • color_space=bt709

  


  • color_transfer=bt709

  


  • color_primaries=bt709

  


  


  Video 2

  


  

  • color_range=tv

  


  • color_space=bt2020nc

  


  • color_transfer=arib-std-b67

  


  • color_primaries=bt2020