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• ffmpeg : Extract unknown data stream from video container

  23 juillet 2020, par Pikkostack

  I have a .MOV container which contains the following tracks :

  


  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 100619 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
  creation_time   : 2020-07-21T22:48:24.000000Z
  handler_name    : DJI.AVC
  encoder         : AVC encoder
Stream #0:1(eng): Data: none (priv / 0x76697270), 87 kb/s
Metadata:
  creation_time   : 2020-07-21T22:48:24.000000Z
  handler_name    : DJI.Meta
Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574), 2 kb/s (default)
Metadata:
  creation_time   : 2020-07-21T22:48:24.000000Z
  handler_name    : DJI.Subtitle


  


  As you can see, stream #0:1, called DJI.meta, is of an unknown data format. I just want to extract the raw data of this stream to a file. So that is the ffmpeg command I tried :

  


  ffmpeg -i .\DJI_0001.MOV -map 0:1 metadata


  


  But using this command results in the following error :

  


  Unable to find a suitable output format for 'metadata'
metadata: Invalid argument


  


  How can I tell ffmpeg that the data should not be formated, so that only the raw data is extracted ?

  


• avformat/riffenc : indicate storage of flipped RGB bitmaps

  8 juillet 2020, par Gyan Doshi

  avformat/riffenc : indicate storage of flipped RGB bitmaps
  Some legacy applications such as AVI2MVE expect raw RGB bitmaps
  
  to be stored bottom-up, whereas our RIFF BITMAPINFOHEADER assumes
  
  they are always stored top-down and thus write a negative value
  
  for height. This can prevent reading of these files.
  Option flipped_raw_rgb added to AVI and Matroska muxers
  
  which will write positive value for height when enabled.
  Note that the user has to flip the bitmaps beforehand using other
  
  means such as the vflip filter.
  

  • [DH] doc/muxers.texi
  • [DH] libavformat/asfenc.c
  • [DH] libavformat/avienc.c
  • [DH] libavformat/matroskaenc.c
  • [DH] libavformat/riff.h
  • [DH] libavformat/riffenc.c
  • [DH] libavformat/wtvenc.c

• Determine FFmpeg codecs available for container

  19 juillet 2020, par CasualDemon

  I am looking to generate lists of supported video / audio / subtitle tracks for each type of container in a particular build of FFmpeg.

  


  For example, I want to avoid errors like Could not find tag for codec <> in stream #0, codec not currently supported in container

  


  I know I can list available codecs with ffmpeg -codecs, and find details about a muxer with ffmpeg -h muxer=<muxer></muxer> like ffmpeg -h muxer=matroska but that will only show default codecs, not all possible.

  


  Muxer matroska [Matroska]:
    Common extensions: mkv.
    Mime type: video/x-matroska.
    Default video codec: h264.
    Default audio codec: vorbis.
    Default subtitle codec: ass.


  


  Basically I want to run this command across all available muxers to build up a table like wikipedia's format comparison charts that is FFmpeg build specific. This is designed to go in a program that wraps around FFmpeg, and I need to know which formats are valid for each container / file extension per FFmpeg build.

  


  Thanks !