I have a lot of clips made with ffmpeg using this command:
ffmpeg.exe -ss XX:XX -t XX:XX -i original.mp4 -c copy clip.mp4.
copy option gives a couple seconds of silence in a result clip, but when a sound starts it is perfectly synced and all players I tried can handle it correctly.
But after importing in Adobe Premiere I got audio and video desynchronized, because it removes that silent at the beginning.
I believe that mp4 has some builtin delay and Adobe Premiere ignore it during import, is there a way to fix it?