PTS adjustment in FFmpeg

[Clément Bœsch]

It is possible to adjust pts with the [a]setpts filters. Unfortunately, it requires re-encoding.

It would be handy if the timestamps could be adjusted at formats level only, so it would only require remuxing to, for instance, shift timestamps.

Such option would be similar to the -y option in mkvmerge. Using our eval system would provide advanced usage.

[Clément Bœsch]

I wonder I could have missed the -itsoffset option, which allows the shift feature...

[pickles]

This would still be a very useful addition. In my case, for example, I need to change the PTS to a fixed rate of 25 frames per second and also change the audio timestamps by counting samples. I achieve this with -vf 'setpts=N/(25*TB)' -af 'asetpts=N/SR/TB' which works great, but, of course, it needs re-encoding, which is unnecessary and time consuming, especially as this is used via a server-side script.

A bitstream filter version of setpts/asetpts would be ideal. Is it even technically possible?

[Carl Eugen Hoyos]

Please do not reopen ancient tickets.
There is a user mailing list, the input option -r and you can open a new ticket if you want to report a deficiency of this option.
Don't forget to test current FFmpeg git head and to provide a command line together with the complete, uncut console output.