I've tried a couple of the OotB solutions for this from MS and Apple. I find the encoding quailty is poor and the audio commonly out of sync. Can anyone recommend a tool that can split and join h.264 / AAC video without reencoding?
lyonrouge: Thanks, I'm not sure if it was the MKV or M4V conversion step, but like other mechanisms I tried, this also had a audio sync mismatch.
If you're having audio sync issues with multiple different pieces of software then there is likely a problem/quirk with your file. mkvmerge is easily able to resync the audio at mux time.
My suspicion is subler, due to how long it took to process the mkv file created by mkvmerge. I'm unable to access the resulting mkv file as non of my systems (Snow Leopard, Win 7 nor OpenSUSE 12.2) will play it.
The final result was m4v. I'm installing an Ubuntu 12.04 desktop to hopefully overcome codec dependancies, that was I should be able to see if the mkv was OK.
lyonrouge: My suspicion is subler, due to how long it took to process the mkv file created by mkvmerge. I'm unable to access the resulting mkv file as non of my systems (Snow Leopard, Win 7 nor OpenSUSE 12.2) will play it.
Installing a Matroska splitter on any of those systems will enable Matroska file playback. The fastest method would be installing a copy of VLC which has all necessary filters installed internally.
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