Audio desyncing in Adobe Premiere

[ksduwo]

Hi everyone, first post. I have some 720p .mkv files that I'm trying to edit in Adobe Premiere CS5. Here's what I've been doing:

1. Use MKVExtractGUI to demux the .mkv file into .h264 (video) and .aac (audio)
2. Use tsMuxeR to remux the .h264 video into .ts video
3. Use WinFF (ffmpeg GUI) to convert the .aac audio to .wav audio

I create a new Premiere project with HDV 720p@24 (which is the resolution and fps of the video), import the .ts and .wav files, and add them to the timeline. If I scroll to a specific point on the timeline, the audio starts off in sync and then quickly gets desynced.

The audio and video streams are the same length and they are synced properly in the original .mkv, but the desyncing happens in Premiere and also after I encode.

I am trying to edit on a budget laptop with integrated graphics. I know that's not ideal but if anyone could suggest a solution I would really appreciate it. Thanks

[poisondeathray]

The audio and video streams are the same length and they are synced properly in the original .mkv, but the desyncing happens in Premiere and also after I encode.

If you have slow computer you won't be able to check for sync unles you render preview, but since export is out of sync, more likely problem with your preprocessing

Sometimes demuxing can cause sync issues. Also if it's a VFR (variable frame rate) source, you won't be able to edit it and keep sync

If you mux the aac back into the .ts, is it in sync in a media player.

Options 1-3 in post #5 should keep sync if original was in sync, and a CFR source
https://forum.videohelp.com/threads/316624-MKV-Adobe-premiere-Best-method-to-import-wit...t-quality-loss

[ksduwo]

Thank you so much! I'm a little confused on those instructions though. I've installed the Ut Video Codec; what do I do now?

[poisondeathray]

It's a digital intermediate - you convert to a lossless format (huge filesizes)
You can use something like vdub, with the mkv plugin or through avisynth with an avs script in vdub

If you don't have lots of free HDD space, choose a different option. AVFS will only take a few kb, but a DI might take 100's of GB

The list in that thread consists of different options you can choose, each has pros/cons

[ksduwo]

Thank you!! I got it working. I installed the Ut Video Codec then added the FFInputDriver plugin to VirtualDub. I opened the mkv in VirtualDub, selected Ut Video Codec YUV420 compression, and saved as AVI. Those worked perfectly and maintained sync in Premiere.

Thanks again, you are the best