lose of sync ffmpeg

[wattmaster]

ffmpeg looses sync when converting files with a custom size. how to I fix this?

 

[ppc_michael]

Can you be more specific? What falls out of sync? And does it start in sync and drift or is it never in sync? What format are the streams in the original file? There's not much for us to go on here.

Please post the command you are using.

 

[wattmaster]

Sorry I posted that rather rushed.

When converting to pretty much any format from any other format

But when I change the pixel size:

the resulting movie looses a/v sync starting slightly out of sync and it gets worse throughout the duration of the clip.