Remuxing variable framerate video?

[TBMNY]

How, if at all would I do this? When just demuxing with tsMuxeR and then muxing with My MP4Box, I get desyncing audio, and I'm almost certain it's because of the VFR. Any advice would be appreciated.

[Selur]

I would agree you dropping the time codes (timing information) seems to be the problem.
Extract the time codes using ffmpeg or other tools that are capable of doing so and add them afterwards using mp4fpsmod or similar.
Alternatively use ffmpeg for the whole remuxing while keeping the time codes.

[TBMNY]

First one won't work because the remuxed file actually becomes a constant 25fps so all those extra frames are lost. As for the second one, not sure how to do that.

[JVRaines]

Something like (may need more options depending on your muxer):

ffmpeg -i myinput -c copy -copyts myoutput

[TBMNY]

My input file is TS and that just outputs TS.

[JVRaines]

The output format is either specified on the command line with the -f option or it is guessed from the extension of the output filename. The fine manual may be read here.