Old 16th May 2007, 14:29   #1
Ralfonso
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Request: Make AAC encoder compatible with iTunes

Hey,

I know it's not really how things sould be, but it would be nice if Winamp could create AAC files that are compatible with iTunes.

Background for me is this: I just bought a JVC car stereo head unit that claims to support AAC playback. After testing the unit I found out it only plays AAC (M4A) files created with iTunes. M4A-files that were created with Winamp or Nero Digital did not playback (also LC AAC, 128kbps).

I know this a bug of the JVC unit and not a shortcoming of Winamp or Nero. However I have to stick with the unit now and I believe there are a lot of other people with JVC radios out there, too, who would also prefer to use Winamp over iTunes to create their AAC files.

If I'm not wrong this feature only requires an adjustment in the M4A header/meta data, not the audio data itself. Hence, an option "make iTunes compatible" in the encoding settings would be nice.

Ralf
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Old 16th May 2007, 17:03   #2
Benski
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Is there any information on what exactly the JVC unit is disliking about Winamp-created M4A files? There's nothing wrong with the M4A files created by Winamp (or Nero for that matter). I would assume that JVC has simplified their MP4 parsing to reduce their costs.
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Old 16th May 2007, 19:07   #3
gameplaya15143
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Re: Request: Make AAC encoder compatible with iTunes

Quote:
Originally posted by Ralfonso
I just bought a JVC car stereo head unit that claims to support AAC playback.
Shouldn't you be talking to JVC about this then?

claims AAC support, but doesn't work properly = false advertising

I'm sure they will be willing to help you
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Old 16th May 2007, 19:23   #4
Ralfonso
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Quote:
Originally posted by Benski
Is there any information on what exactly the JVC unit is disliking about Winamp-created M4A files? There's nothing wrong with the M4A files created by Winamp (or Nero for that matter). I would assume that JVC has simplified their MP4 parsing to reduce their costs.
I believe you are correct with that assumption. The information is that the file type is "not supported". I tried to change the ftyp header information in the winamp encoded m4a-files with a hex-editor accordingly to simluate an iTunes file. The result was, that I didnt get the error message and the unit tried to start playing the file. However it paused at 00:00:00. So I guess something else has to be changed as well.
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Old 16th May 2007, 19:26   #5
Ralfonso
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Re: Re: Request: Make AAC encoder compatible with iTunes

Quote:
Originally posted by gameplaya15143
Shouldn't you be talking to JVC about this then?

claims AAC support, but doesn't work properly = false advertising
That's *exactly* what I wrote them.

Quote:
Originally posted by gameplaya15143

I'm sure they will be willing to help you
I seriously doubt that. That's why I posted my request here. I believe the winamp developers are more flexible and competent than those guys at JVC. Please don't proof me wrong.
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Old 16th May 2007, 19:40   #6
Benski
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If you manage to get a contact at JVC, let me know and I'll see what I can uncover. If they're willing to send me a head unit, I can work on working around their bug. You can e-mail me directly at [my forum nickname]@[media player you're using].com
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Old 17th May 2007, 17:53   #7
Ralfonso
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Quote:
Originally posted by Benski
If you manage to get a contact at JVC, let me know and I'll see what I can uncover. If they're willing to send me a head unit, I can work on working around their bug. You can e-mail me directly at [my forum nickname]@[media player you're using].com
I just checked the JVC America website and to my surprise the unit is not advertised as AAC compatible there. It's different on the JVC Germany page but I doubt they are going to send you a unit. Well, I guess I have to wait for a response from customer support for now...

I'm not really a pro in MP4 standards. Do you have any suggestions how I might do some testing by myself? Like I said, I already modified the FTYP-header information. Also, I deleted the two extra tracks (BIFS, OD) with mp4UI that winamp puts in the container and iTunes doesn't (what are these tracks for anyways?). Any other suggestions?
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