I can try other approach to preserve A/V sync. For that I need:
1) I don't know your source container from the initial MediaInfo.
Please obtain a Source.mkv from it, renaming or converting with MkvToolNix.
2) Extract the timestamps from video and audio tracks of Source.mkv:
..."mkvextract.exe" "Source.mkv" timestamps_v2 0:"Source.mkv_ 0.txt" 1:"Source.mkv_ 1.txt"
zip "Source.mkv_ 0.txt" and "Source.mkv_ 1.txt" and upload here (Attach)
3) Put here your avs, at least with Trim's an any other function than change fps.
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BeHappy, AviSynth audio transcoder.
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