I have a bunch of downloaded .mp4 files that, for some reason, are in 16:9 format while the original material was in 4:3. I want to put these on an Zune, and the Zune can't stretch video. So I'm looking for a way to change it, but re-encoding is out of the question. Thanks.
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Other than basic stuff, YAMB can be buggy when it comes to more complex items, such as PAR... (PAR = Pixel Aspect Ratio). Well, it has been for me at least.
I prefer the the mp4box CLI using the "par" command for this. Look here for some documentation:
Either way, this will be done at the container level, not on the stream itself.
However, I'm just curious, doesn't the Zune only support square pixels (PAR=1:1)? Even if you could adjust the PAR value, it probably would be ignored anyway.
As well, are your source MP4 files square pixel 16:9, something like 640x352 with PAR 1:1? This changes things.I hate VHS. I always did.
Thanks for the helpful replies. Where is PAR in the gui? I would just use the CLI like Puzzler said, but when I double click the exe, it comes up for 1/10 of a second and then disappears. Don't know why. And about the Zune and square pixels, I'm not sure, actually I have no idea, but I think it's worth a try.
Okay, I've never used a command line interface before, so sorry if I'm sounding stupid, but here is what I type in:
mp4box -add inputfile.mp4#video -par (don't know)=4:3 -add inputfile.mp4#audio -new newfilename
I think I'm getting everything right except for the PAR command because it successfully imports the audio and video tracks, but what is the TrackID? Because the documentation says the command is: -par trackID=PAR.
So basically, what is the TrackID? Thanks for your patience.
track should be 1 for the video, 2 for the audio
you have to calculate the par
display aspect ratio = frame aspect ratio x pixel aspect ratio
e.g. NTSC spec DVD 720w 480h frame size, you want it to display 16/9
16/9 = 720/480 x 32/27
so the calculated par is 32:27
mp4box -add inputfile.mp4#1:par=X:Y -add inputfile.mp4#2 output.mp4
As puzzler mentioned, this is container level signalling, while most software players will acknowledge the flag, I doubt it will work on your device. Please post if it works or not for the zune, so others searching for this can benefit
Last edited by Baldrick; 24th Jun 2014 at 13:06.
IT WORKS!! Thank you SO much poisondeathray and puzzler for your quick replies. Yah, put it on the Zune, displays in perfect, flawless, 4:3!! So that's great to know.
I hate VHS. I always did.