Workaround for broken(?) m4a files from ffmpeg, was Re: [PATCH] Output AAC as M4A for iTunes with metadata tags

[Simon Nash]

richard wrote:
> On Mon Apr 11 12:24 Simon Nash wrote:
> 
>> In the DecoderConfigDescriptor within the esds atom, there's
>> a field named avgBitrate (average bit rate).  In the file that doesn't
>> play, this field is set to zero.  In the file that does play, this 
>> field is set to a non-zero value.
> 
> That ties in with what EasyTag was reporting. It gave an incorrect
> bitrate. I referred to it earlier. See last paragraph here:
> 
> http://lists.infradead.org/pipermail/get_iplayer/2011-March/001129.html
> 
>> I have sent Richard a .mp4 file created in this way for him to try.
> 
> That won't play in the Marantz as its a video file. I need a m4a file to
> test.
> 
> 
> 
I'm puzzled by this.  There is definitely no video in this file, and
it plays OK on my Linn DS.  The Linn DS is happy with both .mp4 and .m4a
file extensions so I had been thinking that these are equivalent for
MPEG-4 files with audio and no video.  Have you tried renaming the file
to test1.m4a?  I tried recreating it as a .m4a file using mp4creator but
the results were identical except for some timestamps.

   Simon