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Author Topic: Can't play a certain AAC file  (Read 1915 times)

hisamagome

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Can't play a certain AAC file
« on: February 02, 2015, 11:16:56 pm »
Below Sony's Japanese page(sorry) has two sample musics.
One of AAC file can't be played by MC20 (20.0.63).
High-Res Flac files are both ok.

bad: Sample_BeeMoved_48kHz16bit.m4a
       "Something went wrong with playback" is displayed.
good: Sample_HisokanaMizugame_44_1kHz16bit.m4a
Output Format are all "No change"

<http://helpguide.sony.net/high-res/sample1/v1/ja/>

If need, I will attach the file.
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glynor

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Re: Can't play a certain AAC file
« Reply #1 on: February 02, 2015, 11:47:25 pm »
Did you disable exclusive access?  If so, that is why.  Read:
http://wiki.jriver.com/index.php/Exclusive_Access

Nevermind.  I tested it.  He's right.  The Sample_BeeMoved_48kHz16bit.m4a file found on the linked site does not play in MC.  It does in VLC Player.
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Matt

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Re: Can't play a certain AAC file
« Reply #2 on: February 03, 2015, 09:30:48 am »
I can reproduce the problem with the sample file.  Still not sure what's going on...
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Matt Ashland, JRiver Media Center

Matt

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Re: Can't play a certain AAC file
« Reply #3 on: February 03, 2015, 09:53:34 am »
Next build:
Fixed: Some M4A files wouldn't decode (we're now checking for an 'mdat' header as well as an 'ftyp' header to denote mp4).

I'm guessing on the header logic check change.  It seems to work on this file, but I don't have a lot of deep knowledge!
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Matt Ashland, JRiver Media Center

hisamagome

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Re: Can't play a certain AAC file
« Reply #4 on: February 03, 2015, 06:20:43 pm »
Hi glynor-san, Matt-san,

Thank you for your strong support!
I wll try with next version.
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Yaobing

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Re: Can't play a certain AAC file
« Reply #5 on: February 03, 2015, 06:57:21 pm »
Quote from: Matt on February 03, 2015, 09:53:34 am
Next build:
Fixed: Some M4A files wouldn't decode (we're now checking for an 'mdat' header as well as an 'ftyp' header to denote mp4).

I'm guessing on the header logic check change.  It seems to work on this file, but I don't have a lot of deep knowledge!

Three main top-level atoms are "ftyp", "mdat", and "moov".  So we might as well check for "moov" too.  I will do that tomorrow.
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Yaobing Deng, JRiver Media Center

AndrewFG

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Re: Can't play a certain AAC file
« Reply #6 on: February 04, 2015, 03:57:25 am »
Quote from: Yaobing on February 03, 2015, 06:57:21 pm
Three main top-level atoms are "ftyp", "mdat", and "moov".  So we might as well check for "moov" too.  I will do that tomorrow.

AFAIK the MOOV box is the actual stream itself, so that would probably be the common denominator for identifying all MPEG4 container files, like MP4 fand their apple flavours M4V and M4A. Or??

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Hendrik

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Re: Can't play a certain AAC file
« Reply #7 on: February 04, 2015, 04:05:24 am »
The question is what the file starts with, we can't search through the entire file for some known pattern, it has to be right at the start there for proper identification.
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AndrewFG

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Re: Can't play a certain AAC file
« Reply #8 on: February 04, 2015, 04:10:24 am »
Good point.
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