I want to convert my all video to MP4 format, but after convertion audio in video files compressed to AAC - maximum 320, but i wnt to keep it lossless. How i can convert it to Mp4 with lossless audio?

mp4/aac is the highest recommended format use with vsl.

it was recomended, because Serato didn't support ALAC files, now it can & i need to convert my files MP4/ALAC

I think mp4/aac is correct for video, but alac it ok for audio only...

VSL doesn't support lossless audio in mp4 containers with H.264 encoding. In fact, I don't know of any mp4 decoders that do. Enlighten me if you know of any.

I've been encoding lossless (ALAC) audio into MP4 files using Compressor (part of Final Cut Pro).

The files play fine in VSL.

The one issue I do notice is that the BPM's SSL calculates for these files do not show up in iTunes.

Should also mention: the files play fine in iTunes as well.

Oh, great! Thank you!

I stand corrected.

Please, more in details. What version you use?

I'm using Compressor 3.5.1. Not sure what other details you're asking about.