Audio Sync issues using various MP4Box tools

[iamloco724]

Im trying to put an FLV file in an MP4 container i extracted using FLVExtract i have tried yamb and mymp4box and each time audio is out of sync

i dont think im doing anything wrong is there any other tools i can use, keep in my mind im new to this so play a little dumb with me im just trying to find out the best way to do this on going for my flv files

[El Heggunte]

Probably your .FLV has variable framerate.

This is what I would try:

a) remux the FLV to an MKV

b) extract the video timestamps to a timecodes.txt

c) use mp4fpsmod ( https://sites.google.com/site/qaacpage/cabinet )

Possibly someone will know a faster and less-convoluted way

[Baldrick]

Check first if they are VFR/Variable FrameRate with mediainfo.

And if they are you must do as el heggunte mentions....or find another source...or a portable flv player.

[iamloco724]

How do i remux to mkv sorry im a noob to this if i remux to mkv and that works im fine with stopping there it doesnt need to be mp4 could be either one

[iamloco724]

and yes its variable

[El Heggunte]

MKVtoolnix

[iamloco724]

Thank you that seemed to have worked