Changing PAR of MP4 video

[Mephesto]

I always used to do MP4Box.exe -par 1=16:9 "video.mp4" which worked fine in the past but not anymore.

It screwed up the resolution in the header so MediaInfo now reports 720x4294964692 instead of 720x400. I had to delete and re-encode.

What's the new trendy way to do this since MP4Box doesn't work anymore?

[aedipuss]

delete it and use the backup copy of the video you made before messing with it?

or toss it and say oh well, i'll remember to make a backup next time

[Baldrick]

Try remux with something else? Like ffmpeg or avidemux(under video and audio choose copy).

[Case]

With MP4Box you set the PAR, not the DAR.
To set a 720x480 video to 16:9, you need a PAR of (480/720)*(16/9) = 32:27 ≈ 1.185
For other frame sizes you have to tweak the numbers.

[Baldrick]

OKey. Back to the topic now.


What mp4box version are you using? Maybe try mp4box 0.5.1 dev from http://gpac.wp.mines-telecom.fr/downloads/gpac-nightly-builds/

[Mephesto]

Thanks Baldrick, that new MP4Box worked. I'm using r2735, but I'm switching over to that GPAC one now.