Correcting aspect ratio in mp4

[tinpanalley]

Is there some software that can handle converting the aspect ratio of a video file easily without doing anything further to the original video file? Just a 1.85:1 video I need converted to 2.35:1.

Thanks!

 

[Elixer]

You mean you want a mp4 viewer than does that?
If so, use VLC. http://www.videolan.org/vlc/

 

[tinpanalley]

You mean you want a mp4 viewer than does that?
If so, use VLC. http://www.videolan.org/vlc/

No, i mean that i want to convert the file. To fix it permanently. I don't like vlc. I watch videos on my rpi2.

 

[Elixer]

In that case, you can use ffmpeg to change the DAR (display aspect ratio) at the container level, then it is up to your viewer to see if it honors it.
If you viewer don't, then use MP4Box to change the PAR (pixel aspect ratio) which re-encodes it to the aspect ratio you want.

 

[tinpanalley]

In that case, you can use ffmpeg to change the DAR (display aspect ratio) at the container level, then it is up to your viewer to see if it honors it.
If you viewer don't, then use MP4Box to change the PAR (pixel aspect ratio) which re-encodes it to the aspect ratio you want.

As far as I know, I could be wrong, but changing the PAR isn't the same as changing the ACTUAL aspect ratio, is it? I'm gonna look for something before I try ffmpeg, I don't have a lot of familiarity with its commands and not a lot of time with this project to learn right now. But thanks for the suggestion.

 

[tinpanalley]

I just looked at one video (that is correct) in Media Info and noticed that the difference is not in res but rather in pixel ratio.
The correct one says:
Bits/(Pixel*Frame) : 0.139

The one that is squished and I need to correct says:
Bits/(Pixel*Frame) : 0.100

So, that is what I need to fix.

 

[tinpanalley]

Ok. In case anyone ever reads this...
I used MyMp4box to demux with the embedded subtitles. Could have used anything else but in this case the subs were not extractable any other way. Then I joined everything in mkvmerge where I properly labelled the audio track and subs to english and set the ratio at 2.35:1.