On Sun, 2011-07-24 at 19:31 +0100, dinkypumpkin wrote: > On 24/07/2011 18:04, Arthur Dent wrote: > > I saw a posting from Jon Davies with a script "fixupm4a.sh" which seemed > > to be just what I am looking for. Unfortunately it seems to rely on > > mp4tags (which I have found comes with libmp4v2 on Fedora) and > > mp4creator which is just not available (that I can find) on Fedora. > > That script doesn't do the actual conversion of AAC files. It was > written to deal with hardware that couldn't play the M4A files written > by ffmpeg available at the time. The script works around the problem by > forcing a re-optimisation of the file. See Jon's explanation in the > message to which the script is attached. I think the problem may have > been corrected in ffmpeg shortly after. > > The basic ffmpeg command to convert a file is: > > ffmpeg -i x.aac -vn -acodec copy -absf aac_adtstoasc -y x.m4a > > I believe we established that ffmpeg from the 0.6 branch produces files > that don't work with iTunes. If that's what you have, you'll probably > need to find a more recent version. The latest release version (0.8) > works OK. > > BTW, if it should prove necessary, the mp4file utility that is part of > the mp4v2 distribution can replace mp4creator, at least for optimisation > purposes. I'm not a Fedoran, so I'm not sure which RPM you would find > it lurking in.
Well Thank You Dinky, Helpful as ever... So... This has been a voyage of adventure... The current Fedora14 version of ffmpeg is ffmpeg-0.6.3-1.fc14.i686 and the "testing" repository has nothing more recent. Even Fedora15 only has ffmpeg-0.7-0.3.20110612git.fc15.i686.rpm. I am not afraid of installing from source, but I generally prefer to use the Fedora packages where possible. So I fired up a virtual machine copy of Linux Mint that I happened to have installed and installed ffmpeg 0.8 on that. The .aac files in question happen to be on a Samba share, but I had a long and boring wrestle with permissions etc in trying to get this to mount in Mint - but eventually managed to run the command you recommend above. It worked! Because I only have 2Mb of RAM in this machine I can't run 2 virtual Machines at the same time so I had to close Mint and run my WinXp VM and load iTunes (This is now the only reason I ever run Windows). The test file I converted loaded just fine. While I was in Windows I thought i would look at installing MP4Box as suggested by Catalin Rafael Coman later in this thread (thanks Catalin!) That was a battle too... However, with it working I found that although MP4Box converts the file(s) OK, it loses the tag information. So. Back to Mint, and write a short script to batch convert all the .aac files and now I'm done! Thanks again for your help everyone! Mark
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