-
Sync issues with lower bit rate 264 or is it compression side effect
I have a 10 minutes PAL SD project I am exporting to both high bit rate for delivery and low bit rate for client approval. The lip sync is fine on the higher bit rate but the lower at time looks out of sync. At first I thought the audio was out of sync but on closer inspection it looks like it is a frame update issue within the 264 encoding. Maybe low bit rate 264 is not a good format for client approval or there are some settings I’m not aware of for improving. Has anyone else come across this?
File 1 – low res – sync issues – 88MB
PAL progressive / 480×384 16×9 / Profile MAIN / Level 3.0 / VBR,2 Pass / Target 0.7Mbs / Max 1.3Mbs / Key Frame 30 FramesFile 2 – SD – sync fine – 265MB
PAL progressive / 720×576 16×9 / Profile MAIN / Level 3.1 / VBR,2 Pass / Target 3Mbs / Max 6Mbs / Key Frame 30 FramesCheers
Andy -
2 Replies
-
I assume you’re exporting .mp4 files based on your settings and not MOV files? If so, are you playing the mp4 files in Quicktime? There is a known bug where Quicktime loses sync with mp4 container files.
If this is the case, render out to MOV with the h.264 codec… a little more dummy proof during client review.
-
Hi Angelo
Yes exporting .mp4 and then playing in VLC but not Quicktime player. I did try exporting MOV 264 but the quality seems much worse when doing a MOV 264 export, is this to do with a lower quality encoder when exporting that way.
Cheers
Andy
Reply to this Discussion! Login or Sign Up