Problem with different time length MP4 and MTS for same period of filming

[mtn]

Hello,

I'm new here, so excuse me if this post is in on the wrong board.

I have MTS footage from a conference, produced using a camcorder, that I am trying to sync up with an MP4 video of a PowerPoint presentation.

The MTS and MP4 are both recordings of the same time period - the MTS is of the person speaking and the MP4 was created using the record function in PowerPoint of the presentation that was being given - but when I try and sync them up the the MP4 play length is shorter, although is contains the same audio content. I can only assume that it is playing slightly faster somehow.

I have tried trying to match the play times by speeding up and slowing down both files. Also the MP4 is 30fps and the MTS is 25fps. I have tried re-encoding each to match the fps of the other, but none of this has made any difference.

If anyone has any ideas about how I can match these files up I would be most grateful. I have 26 such presentations to do so doing each one manually would be a real pain.

My hardware/software set up is as and 8 core Clevo laptop running Linux Ubuntu 16.04 and using Kdenlive for video editing.

Thanks you for your consideration,

Michael, Edinburgh

[poisondeathray]

1) Were they continuous recordings ? Or were there periods of pause/start/stop?

2) How much is it "off" by, and how long was that presentation (or duration of a typical presentation on average) ?

3) Are both audio , video off by the same amount ? or is there an A/V difference within a single video (MTS vs. MTS, MP4 vs. MP4)

4) What does mediainfo (view=>text) say about each ? copy & paste the text report back here for a MP4 and it's corresponding MTS



There is software that can automatically sync cameras and actually do a good job, even correct for drift, but not for linux, and not free. Plural Eyes comes to mind
https://www.redgiant.com/products/shooter-pluraleyes/