Thanks, Neil, for your detailed response. And thanks again for all the info you gave me in response to my Star Trek question and on the phone last year. m4a vs FLAC I didn’t realise that m4a was a container, not a codec. Thanks for that enlightening. But I’m pretty sure my m4a files are lossless. The file size, typically 30-50% of the wav file, tells me that there’s a lot of data inside. And MediaInfo tells me that the audio stream inside the m4a container is ALAC. The reason I settled on m4a instead of WAV was to save space. I run five 2TB drives as backups, and want to keep all my projects within the 2TB. So I’m careful about file size. The reason I chose m4a over FLAC was because my version of InDesign (CS6) can’t read FLAC, and also because my version of OSX (10.9) won’t indicate the length of FLAC files. M4a has one drawback though – Audition can’t save in m4a format, so when editing audio I have to save as WAV and then convert. If I have metadata that I don’t want to lose, I fall back on FLAC. Using Encore as an assembly tool “…a consequence of an earlier decision to use Encore as an editor instead of as an assembly tool alone.” I actually don’t use Encore as an editor, but as an assembly tool. For my purposes, Blu-ray is the best delivery method for my public AVs (slide shows mostly) because I don’t trust computers in public. My research showed that Blu-ray from a Blu-ray player was the most reliable method of showing AVs. I did look into Q-Lab, but my goodness, the lengthy list on how to prepare your computer for a public performance, put me off. With Blu-ray, I insert the disk (or USB stick) and it works every time. My Approach I'm a hobbyist. I'm not looking towards a feature film on Blu-ray, I'm just digitising old slide shows. Blu-ray might be a possibility sometime in the future though. Typically my public shows run for about 2.5 hours and have about 30-50 sections, coming from separate Premiere projects. There’ll be an introduction, several shorts, previews from upcoming shows, and then the main AV. The shorts and the main AV will themselves consist of several chapters. I assemble the lot in Encore, including a count-down timer for the 20-minute interval, build to Blu-ray, and away it goes on the night with one press of the button at 7:30 PM. My approach is to export from Premiere, all the sections and chapters as m4v and wav. I check them separately as they are finished, by using Encore to build to a Blu-ray folder, and saving on a USB stick. My Blu-ray player, an Oppo, has the rare ability to play Blu-ray folders from USB sticks. Thus my original post about USB times. Inside Encore, I make sure each m4v has Don’t Transcode status, so that the build runs quickly. When I am happy with each section after viewing in our home theatre, I archive as m4v, convert the wav to m4a, and I'm ready to assemble at a later date which could be years away. Encore allows me to easily assemble numerous elements into the one timeline, and to build to Blu-ray much faster than real time. Each element has already been checked, so I know it's going to work. Last night, a 45 minute project built in less than 3 minutes (the PGC file was already in place). I experimented with Playlists, I experimented with Q-Lab, but I found that timelines in Encore are the best solution for me. That explains why I wanted to test build times for joining two WAV files. Not because I wanted to join them, but because my Encore projects typically have 30-50 ‘joins’, and I wanted to know what was causing the delays. I couldn't understand why a 1GB m4v file was building faster than a 100MB wav file. Another Question That brings me to another question which maybe someone can answer to save me more testing. Encore goes to the bother of “rebuilding audio tracks”, joining all the audio into one lengthy wave file with a name such as _PGC_Epgc_track_Ltrk_1_audio. That file is saved inside the Sources > Transcodes folder. But when the Blu-ray is built, it consists of numerous m2ts files, corresponding to each of the sections. That PGC file is there on my hard drive, but is not on the Blu-ray. Why is that? Why does Encore join all the audio, then break it apart again?
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