[MPlayer-dev-eng] incoming/Vorbis_in_MP4_lavf_fail.mp4

[Baptiste Coudurier]

Michael Niedermayer wrote:
> Hi
> 
> On Sat, Mar 17, 2007 at 12:39:59AM +0100, Baptiste Coudurier wrote:
>> Hi
>>
>> Michael Niedermayer wrote:
>>> Hi
>>>
>>> On Fri, Mar 16, 2007 at 06:36:46PM +0100, Reimar Döffinger wrote:
>>>> Hello,
>>>> On Fri, Mar 16, 2007 at 03:56:58PM +0100, Nico Sabbi wrote:
>>>>> Compn wrote:
>>>>>> ffplay and mplayer detects audio correctly
>>>>>>
>>>>>> mplayer -demuxer lavf does not.
>>>>>>
>>>>>> adding format 0x6134706D to audiocodec vorbis allows it to play
>>>>>> but its still trying faad first.
>>>>>>
>>>>>> Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
>>>>>> FAAD: Failed to initialize the decoder!
>>>>>> ADecoder init failed :(
>>>>>> ADecoder init failed :(
>>>>>> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
>>>>>> AUDIO: 48000 Hz, 2 ch, s16le, 0.0 kbit/0.00% (ratio: 0->192000)
>>>>>> Selected audio codec: [ffvorbis] afm: ffmpeg (FFmpeg Vorbis decoder)
>>>>>>
>>>>>>
>>>>>>
>>>>> try with svn blame who broke it, please.
>>>> I think this was never fixed. The problem IIRC is that lavf demuxer uses
>>>> a different mov atom to detect the format, but that one only contains
>>>> "mp4a".
>>> if codec_tag is mp4a then this is wrong, codec_tag should contain the thing
>>> which is looked up in ff_mov_obj_type
>>>
>>> grep ff_mov_obj_type in lavf/mov.c set codec_tag to it run regression tests
>>> check if this fixes the mplayer+lavf problem send patch
>>>
>> Humm well it makes sense for mp4, not sure for mov, dunno if other
>> codecs use "mp4a" as stsd tag in mov but stores something else and use
>> "esds" atom, and tag will be a simple int, but I've no real objection.
> 
> hmm esds in mov? i thought esds is mp4 specific, ive checked the QT spec
> i have theres no match for "esds" ...

yes, aac and mpeg4 put "esds" in "stsd" as decoder specific info.

> my idea was that mov would set codec_tag like it does currently and .mp4
> would set it based on esds (= whats in ff_mov_obj_type)

well that will be problematic with stream copy since it honor codec_tag
first atm, and I feel like having an int as codec_tag will surely
conflicts with wav tags or something. Reimar's solution is probably safest.

-- 
Baptiste COUDURIER                              GnuPG Key Id: 0x5C1ABAAA
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