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 Posted: Wed, 27th Apr 2005 08:26 Post subject: [PSP] PSP DVD Conversion |
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Hi guys. Since I do not yet have a PSP, consider this work in progress.
I've taken up the project of optimizing video conversion on the PSP.
Why bother, you ask? Simple. Tools like PSP Video 9 (http://www.pspvideo9.com/) offer rudimentry conversion and compression, but they offer you no control over your video, and they're slow as shit. Therefore, I'm going to figure out a way (or rather use the findings of others to do so) to convert a full-length, commercial DVD onto the PSP.
Once again, I do not yet have a PSP (I should by the time that this guide is complete, though), so I'll need your help. I'll post videos here (easy mods, I'll use trailers) and I will need the PSP owners out there to tell me if they work, how smoothly they run, any dissynchronization between video/audio/etc.
For now, consider this thread a placeholder. I'll keep updating it as I learn more about this.
Current knowledge:
The PSP features a 4.5" screen with a 480x272 screen resolution.
Sony's UMD movies use the full resolution (which totals 130560 pixels per frame).
The PSP can play back video from either Memory Sticks or UMDs, although the memory stick option seems to severely cripple playback (limited to a single MP4 standard and AAC, as well as 76800 pixels per frame or less.
Goal:
To put a picture with maximised quality onto the PSP
Tools:
In order to get the video onto the PSP, I'm currently going to use the PSP Video 9 app as the last step. However, I'm going to optimize resolution, framerate, and bitrate beforehand. The tools you will need, therefore, are:
SmartRipper
DVD 2 AVI
headac3he
VFAPI Converter (Should come with appropriate codec)
VirtualDub
PSP Video 9
Various notes:
- PSP won't read video larger than it's max. Pix. Per Frame by default
- Can be easily tricked into bypassing PPF with psprez-b1.zip (google this)
- Screws up, needs reset if the above hack is used to exceed PPF limit
- Reads larger PPFs from UMD, but UMD supposedly uses a diff. codec, one that cannot be used from MSDUO.
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Mutantius
VIP Member
Posts: 18594
Location: In Elektro looking for beans
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| Posted: Wed, 27th Apr 2005 10:01 Post subject: |
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Sounds very interesting, I will try to contribute and I should have my PSP next week.
"Why don't you zip it, Zipfero?" - fraich3
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MAD_MAX333
Moderator
Posts: 7020
Location: Toronto, Canada...eh
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| Posted: Wed, 27th Apr 2005 12:12 Post subject: |
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well you can fit a fulll DVD on a 512meg UMd, and now we have 1 gig and 2 gig UMDs so its not a problem.. i do it for my cell phone... the P900, i used that guide that was posted here... the dude compressed the matrix dvd onto a 128meg UMD.. very amazing
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| Posted: Wed, 27th Apr 2005 15:47 Post subject: |
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| MAD_MAX333 wrote: | | well you can fit a fulll DVD on a 512meg UMd, and now we have 1 gig and 2 gig UMDs so its not a problem.. i do it for my cell phone... the P900, i used that guide that was posted here... the dude compressed the matrix dvd onto a 128meg UMD.. very amazing |
A cell phone has screen sizes ranging from 96x64 to 320x240... Assuming that it supports DiVX and MP3, fitting the matrix into less than 128mb is a given, if you're willing to compromise on the quality settings.
If the screen is a full 320x240 full of goodness, and the DVD is in the 16:9 aspect ratio (most of mine are), you'll be encoding the final result in 320x176 (originally 180 but cut down to 176 to better comply with DiVX's 16x16 block sizes; the difference is not noticeable).
The problem with the PSP is that friggin' limit. I hope that it gets removed, officially or otherwise. Basically, the strategy at the moment is to get a maximum of horizontal pixels in, even if it should cause slight stretching. That doesn't mean we'll be encoding the video at 480x160 (though the option isn't excluded entirely), but a good balance seems to be 416x176.
I've got a placement test at the college I'll probably be going to in about 2 hours, but I'll screw around with this some more when I get back. Most likely by the end of the day I'll post a few files:
- a standard 16:9 trailer in 416x176, 768kbps bitrate
- a standard 16:9 trailer in 480x160, 768kbps bitrate
- a standard 16:9 trailer in 416x176, 640kbps bitrate
- a standard 16:9 trailer in 480x160, 640kbps bitrate
- a standard 16:9 trailer in 416x176, 512kbps bitrate
- a standard 16:9 trailer in 480x160, 512kbps bitrate
- a standard 16:9 trailer in 416x176, 384kbps bitrate
- a standard 16:9 trailer in 480x160, 384kbps bitrate
- a standard 16:9 trailer in 416x176, 256kbps bitrate
- a standard 16:9 trailer in 480x160, 256kbps bitrate
- a standard 16:9 trailer in 416x176, 128kbps bitrate
- a standard 16:9 trailer in 480x160, 128kbps bitrate
This is to determine what is the least bitrate we can get away with without too much artifacting (large blobs of dragged-over pixels), as well as to see which of the 2 resolutions seems to look best (for now I am relying on the "maximize horizontal pixels" route, since vertical pixels are more easily and less perceptibly stretched.
You may choose to remark that neither 416x176 nor 480x160 are in 16:9 aspect ratio. You are smart, and for this I'm going to have to kill you. The mediating factor here is the PSP itself: anything that is not in the correct aspect ratio will be either zoomed on or stretched by the PSP to come out in such. Usually, the choice is yours. I say usually, because apparently the PSP is known for being a prick at not Sony Approved resolutions. It'll still play the files if it's hacked with the file I mentioned in the first post (no, I don't have a mirror), but apparently it won't let you choose which option to use and just plasters the whole video onto the whole screen. Since the PSP's screen is in 16:9 aspect ratio, properly transcoded 16:9 video clips will apparently be stretched to their native aspect ratio.
A final note to Mutantius and the rest of you with PSP's:
once I post the videos, any verbal feedback on which runs better is appreciated. It would also be great if you took out that camera, paused the video at a good moment, and posted a snapshot in high-res of what the video actually looks like. Not the most effective method by far, but be creative here. One suggestion is to tape the PSP into the center of the bottom of an empty box, cut a hole in the center top of the box, and use optical zoom as necessary.
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| Posted: Wed, 27th Apr 2005 23:38 Post subject: |
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After some more reading, I've discovered, to my great discontent, that my work's pretty much been done for me... This is a video I made from a quicktime trailer. There are black bars on top and bottom that should work out to ~5 pixels a side. The rest should work fairly easily. Be warned, the zooming functions may not work while viewing this, blame Sony for it.
http://rapidshare.de/files/1464994/ridPSP.zip.html
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Mutantius
VIP Member
Posts: 18594
Location: In Elektro looking for beans
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| Posted: Thu, 28th Apr 2005 09:15 Post subject: |
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I will look into it when I get my PSP.
"Why don't you zip it, Zipfero?" - fraich3
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