[Libquicktime-devel] twos vs sowt audio

[Steven M. S. <sm...@2B...>]

Hi -

	I'm beginning to investigate why ffmpeg/libavcodec isn't recognizing
	'dv5n' (DVCPRO50) Quicktime files.  

	I have a Quicktime file (exported from Final Cut) that qtinfo
	says this about:

qtinfo dvcpro50.mov 

[codecs] Warning: Could not find audio Decoder for fourcc sowt
[codecs] Warning: quicktime_decode_audio_stub called
[codecs] Warning: Could not find video Decoder for fourcc dv5n
[codecs] Warning: quicktime_decode_video_stub called
Type: Quicktime
  1 audio tracks.
    2 channels, 16 bits, sample rate 48000, length 48000 samples, compressor sowt.
[codecs] Warning: quicktime_decode_audio_stub called
    Sample format: Undefined.
    Channel setup: Front Left, Front Right
    Language: eng
    not supported.
  1 video tracks.
    720x480, depth 24
    rate 30.000000 [3000:100] constant
    length 30 frames
    compressor dv5n.
    Native colormodel:  Undefined
    Interlace mode:     Bottom field first
    Pixel aspect ratio: 10:11
    not supported.
  0 text tracks.
[codecs] Warning: quicktime_delete_acodec_stub called
[codecs] Warning: quicktime_delete_vcodec_stub called

	The warning about fourcee dv5n is expected but I thought uncompressed
	audio was handled.

	libquicktime handles 'twos' audio in plugins/lqt_audiocodec.c  but
	it would appear that 'sowt' support is not present.

	Is 'sowt' something that LQT should implement (in lqt_audiocodec.c)
	or should an libavcodec (for example) be providing support for
	the fourcc 'sowt'?

	Cheers,
	Steven Schultz