[Ffmpeg-devel] WMA encoding and Windows Media Player for Mac OS X

[Patrice Bensoussan]

On 5 Mar 2007, at 10:53, Michael Niedermayer wrote:

> Hi
>
> On Sat, Mar 03, 2007 at 07:03:04PM +0000, Patrice Bensoussan wrote:
>>
>>>>
>>>> On 8 Feb 2007, at 23:05, Michael Niedermayer wrote:
>>>>
>>>>> Hi
>>>>>
>>>>> On Thu, Feb 08, 2007 at 10:37:54PM +0000, Patrice Bensoussan  
>>>>> wrote:
>>>>>> Hi,
>>>>>>
>>>>>> All the files encoded by ffmpeg in wma (using wmav1 or wmav2)  
>>>>>> will
>>>>>> open in Windows Media Player for Mac OS X, but you don't hear
>>>>>> anything (it only plays silence). The same file seems to play
>>>>>> correctly with mplayer or QuickTime with the Flip4Mac codec.
>> Any idea
>>>>>> what could be wrong in the encoding which would cause Windows
>> Media
>>>>>> Player for Mac OS X to play only silence? The information
>> window in
>>>>>>> Windows Media player on a converted file shows:
>>>>>>
>>>>>> audio codec unknown
>>>>>> video codec wmav1
>>>>>>
>>>>>> Am I missing an option, or is this a known bug in ffmpeg?
>>>>>> Thanks,
>>>>>
>>>>> hmmmm :(
>>>>> does it work if you mux into .avi ?
>>>>
>>>> Believe it or not, Windows Media Player doesn't play .avi files on
>>>> Mac ;-)
>>>>
>>>>> does it work if you -acodec copy a working wma into .asf ?
>>>>
>>>> No, same problem. The interesting thing is when doing this, the
>>>> original file shows:
>>>>
>>>> Length: 00:35
>>>> Bit Rate: 160 Kbps
>>>> Media Type: Audio
>>>> Audio Codec: Windows Media Audio V8
>>>> Video Codec: Unknown
>>>>
>>>> whereas the .asf generated with -acodec copy shows:
>>>>
>>>> Length: 00:34
>>>> Bit Rate: 160 Kbps
>>>> Media Type: Audio
>>>> Audio Codec: Unknown
>>>> Video Codec: wmav2
>>>>
>>>> So the codec info is stored at the wrong place it seems? (video
>>>> instead of audio) Not sure this is related though.
>>>
>>> ive changed a few things in the asf muxer, please retry and report
>> if theres
>>> any improvment (or other change)
>>
>> Sorry forgot to test this one...
>
> the Audio/Video codec names and order should be fixed, please retry  
> and
> report back

Looks better. Still one little difference with the original file when  
using -acodec copy:

There is a second line on the info box under audio codec which says  
"160 kbps, 44khz, stereo" on the original file. It says "Unknown" on  
the file created with ffmpeg with -acodec copy. Not a big issue I  
guess...

Patrice