Support and General Use > Audio Playback, Database and Playlists
Using MP4Box to fix iTunes-downloaded mp4 files
Bockrox:
I've noticed that Rockbox is unable to play some mp4 files that were downloaded with iTunes. When I attempt to play any of these files, it skips over them without playing any music.
I've done some research, and this seems to be related to the way metadata is stored in these files. Rockbox requires all metadata to be at the start of the file, but this is not always the case with iTunes music. Please correct me if I am wrong about this.
I've seen two solutions proposed for this problem -- using mp4creator --optimize on the files and using some tool provided by MP4Box on the files.
Does anyone have any experience using MP4Box to solve this issue? I try using MP4Box -flat filename.mp4, but I get the following message and the file is not altered:
--- Code: ---[iso file] Box "stsd" has [some number] extra bytes
--- End code ---
Any insight would be greatly appreciated. Thanks!
saratoga:
--- Quote from: Bockrox on August 28, 2010, 02:01:59 PM ---I've noticed that Rockbox is unable to play some mp4 files that were downloaded with iTunes. When I attempt to play any of these files, it skips over them without playing any music.
--- End quote ---
I've never heard of this problem. Post one of the files.
--- Quote from: Bockrox on August 28, 2010, 02:01:59 PM ---I've done some research, and this seems to be related to the way metadata is stored in these files. Rockbox requires all metadata to be at the start of the file, but this is not always the case with iTunes music. Please correct me if I am wrong about this.
--- End quote ---
This should be fixed in r24147:
http://svn.rockbox.org/viewvc.cgi?view=rev;revision=24147
Bockrox:
Thank you for the info, saratoga.
I believe these were the two primary threads that led me to this understanding. They discuss a very similar issue to the one I am having and recommend mp4creator --optimize as a solution.
http://forums.rockbox.org/index.php?topic=14368.msg115048#msg115048
http://forums.rockbox.org/index.php?topic=6748.0
The only problem my distro doesn't (seem) to provide mp4creator. I was hoping I could accomplish the same task using MP4Box, but as I said I seem to be having some problems with that tool.
AlexP:
What version of Rockbox do you have?
Bockrox:
I'm currently running Rockbox 3.6.
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