[SOLVED] Question about VLC m4a files.

*nix specific usage questions
bat999
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[SOLVED] Question about VLC m4a files.

Postby bat999 » 16 Apr 2011 20:06

Hi
I'm using VLC 1.2.0-git Twoflower (revision 5637ca8) and Ubuntu Karmic Koala 9.10.

I recently had a problem with FFmpeg.
When I created m4a files, they would not play in my 2nd generation iPod Shuffle Model A1204. :(
I asked about it on the ffmpeg-users mailing list.

It seems that the MPEG-4 "esds" atom is permitted to be expressed in either one byte or 4 bytes.
But this Shuffle can only play m4a files when the 4 byte method is used.

Previously FFmpeg saved the atom in one byte.
Now, FFmpeg's been changed to the 4 byte method.
So the files play OK in my Shuffle. :D
This is the relevant FFmpeg commit:- http://git.videolan.org/?p=ffmpeg.git;a ... 7c238e96b2

I've also tried converting files to m4a using VLC.
These files won't play on the Shuffle. :(
Is this because VLC uses the one byte method when creating m4a files?

I've uploaded some test files here:- http://www.mediafire.com/?inj58ld4n819eqj
test1.m4a is created using FFmpeg with this command:-

Code: Select all

ffmpeg -i foo -acodec libfaac -ab 64k test1.m4a
test2.m4a is created using VLC with this command:-

Code: Select all

cvlc foo :sout='#transcode{acodec=mp4a,ab=64}:std{access=file, mux=mp4,dst=test2.m4a}' vlc://quit
Last edited by bat999 on 19 Nov 2011 22:57, edited 1 time in total.

bat999
Cone that earned his stripes
Cone that earned his stripes
Posts: 200
Joined: 19 Dec 2007 02:35

Re: Question about VLC m4a files.

Postby bat999 » 12 Nov 2011 17:05

Hi
This bug isn't fixed yet.
It's VLC that is producing m4a files that are not compatible with iPod Shuffle.

http://trac.videolan.org/vlc/ticket/4691

Ticket #4691 (closed defect: notvlc)


"notvlc" == VLC developer is in denial. :roll:
(joke :D )

funman
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Joined: 03 Sep 2006 04:03
VLC version: master
Operating System: All of them
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Re: Question about VLC m4a files.

Postby funman » 13 Nov 2011 03:42

http://mailman.videolan.org/pipermail/v ... 83136.html should fix it.

Let's see if Laurent agrees with importing the FFmpeg fix

bat999
Cone that earned his stripes
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Posts: 200
Joined: 19 Dec 2007 02:35

Re: Question about VLC m4a files.

Postby bat999 » 19 Nov 2011 22:56



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