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.avi to .avi
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gsusx
Newbie
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27. July 2004 @ 07:50 |
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Hi there,
I'm a wee bit stuck and am hoping someone has a simple solution for me !!!!
I have a fair few divx and xvid movies but I want to just convert these to play on my archos av340 (I need the entertainment on the train !!!!!!!)
Basically the archos will only play files as below, and I just need to convert my current xvid divx files so that my archos will recognise these. Can anyone recomened a good and preferably easy program that I can use for this (I don't mind if it takes a few hours as I can always leave it going overnight)
If you could help me i'd be enternally grateful (And less stressed when my train is stuck outside of the station because of a points failure !!!)
Cheers all, and here's the archos stats: It's all dutch to me im afraid !!!!
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What are the max resolutions the AV300 can support?
Officially:
640x304@30fps
640x368@25fps
640x480@(low)fps
Unoffically:
The AV300 will attempt to play any Mpeg4 AVI that is 640x480 or less regardless of its FPS, however, if it can't keep up, the audio and video get out of sync and the video jumps randomly. Any resolution larger than 640x480 and the AV300 simply says: "Cannot play video data! Image size too big."
So, what are the max resolutions and frame rates that the AV300 can keep up with? To answer this question, I have to make some assumptions:
The max resolution is limited by the DSP speed
The DSP can only process so many pixels per second.
So, we can guess the DSP Pixel-Per-Second rating using the official max video resolutions:
640 x 304 x 30 = 5,836,800pps
640 x 368 x 25 = 5,888,000pps (I'll use this value)
The official max resolutions are at the lowest of the 3 DSP speeds:
94.5mhz (Standard)
99.0mhz (5%) (Overclock)
108.0mhz (14% faster) (Overclock)
With these assumptions I have speculated the following theoretical max resolutions (remember, both the width and height must be multiples of 4 for Mpeg4 video):
DSP Freq: 94.5mhz
DSP Freq: Standard
W*H*FPS < 5,888,000 DSP Freq: 99mhz
DSP Freq: Overclock
W*H*FPS < 6,168,380 DSP Freq: 108mhz
DSP Freq: Overclock
W*H*FPS < 6,729,142
Official
Max Resolutions 640x304@30fps
640x368@25fps
Speculated Max
Width=640
Resolutions
640x380@24fps (1.66:1 ratio)
640x460@20fps
640x480@19fps (4:3 ratio) 640x320@30fps
640x384@25fps (1.66:1)
640x400@24fps
640x480@20fps (4:3) 640x348@30fps
640x420@25fps
640x436@24fps
640x480@20fps
Speculated Max
4:3 Aspect Ratio
Resolutions
508x384@30fps (NTSC fps)
560x420@25fps (PAL fps)
568x428@24fps
624x468@20fps
640x480@19fps
520x392@30fps (NTSC)
572x428@25fps (PAL)
584x440@24fps
640x480@20fps
544x408@30fps (NTSC)
596x448@25fps (PAL)
608x456@24fps
640x480@21.9fps
What are Aspect Ratios?
Someone else has already covered this better than I could - click here.
What is Full DVD resolution?
For the NTSC standard (USA TV): 720x480@30fps
For the PAL standard (Europe TV): 720x576@25fps
Note: If you do the calculations, neither of these resolutions have an aspect ratio of 4:3, but NTSC and PAL both use the 4:3 aspect ratio. Why is this? It is because both of these resolutions use non-square pixels. In other words, the calculations for maintaining the correct aspect ratio are a little more complicated. Usually your DVD ripping software will take care of this automatically. (sorry to gloss over this, but it would take some time to explain)
Why do my AVIs not play fullscreen?
Only certain video resolutions will play full screen on the AV300.
640x480 is full screen - if your AVI is < 640x480 but > CIF, it will not play "full screen"
352x288 (cif) is full screen but cropped (it goes slight off the screen)
320x240 is full screen - if your AVI is < 320x240 it will not play "full screen"
::CJ::
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TheTorg
Suspended due to non-functional email address
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28. July 2004 @ 20:08 |
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Well, it appears that your Archos player has a screen resolution of 320x240. This means that if the sole purpose of your video files is to be played on your Av340, then a larger resolution will simply go to waste.
You should resize them to the native resolution of the player, as this will improve performance and leave extra space for either your own recordings or even more movies. I'm guessing you'll want more than one movie, considering the length of most train rides.
Don't worry about the framerate ("...@25fps"). As long as you keep the resolution relatively low, it'll play whatever framerate your videos have. And since we're going to lower the resolution to 320x240, you won't have any problem with framerate.
Your player can play both XviD and DivX files, but unfortunately I know of no way to resize a movie without re-encoding it. Fortunately, this is quite painless and will take very little time - with the right tools . I'd say that if you're going to re-encode them anyways, you might as well make them all DivX, as this codec has slightly higher compression and the latest version (5.2) is extremely speedy.
You can get a free (and legal) version of DivX at:
http://www.divx.com/divx/
I'd suggest plain old DivX, or you can also aquire a 6-month trial of Pro. You won't need Pro, though, for what you're doing.
You can get the latest version of VirtualDub from:
http://www.virtualdub.org
VirtualDub allows you to save several projects at a time and process them all at once so you can click start and go to bed (and it'll even shut down your compy when it's done).
Now, it would take a zillion years for me to go through how to use VirtualDub along with DivX, which is why DivX's guide includes a section on how to use VirtualDub in accordance with it's own software. The guide can be downloaded at:
http://download.divx.com/divx/DivXUserGuide52.exe
DivX has "profiles" which will help you to configure the settings for your videos. I would suggest using the "portable" profile for your unit. VirtualDub has a few settings as well. I would use "Full Processing Mode", as LCD screens (especially portable ones) aren't very friendly to poorly compressed videos.
Don't forget to check the section on resizing. You can either use DivX's resize filter or VirtualDub's. You can decide which you like the most. DivX's filter will produce slightly better results - quality as well as performance (speed), but VirtualDub's is more friendly and much easier to use.
Usually, when resizing, I'll use VirtualDub's filter to figure out exactly how much I need to resize or crop, then I'll click cancel and apply those settings to DivX's interface. I'm not sure if you should crop off letterboxes or not, because your player might try to stretch the video to fit the screen, which would look horrible. Test it by taking them off of one video and see. But remember: If you need to resize as well as crop, DivX's filter crops and then resizes. I'm not sure why, it should be the other way. VirtualDub lets you specify which you would like to do first.
More help on the use of VirtualDub can be found in the "Guides" section of AfterDawn, under DivX, then "Copy your DVD into DivX5 format - Guide for 16:9 anamorphic movies". I would disregard most of the other stuff, though, as it is fairly outdated (with regards to DivX and other software).
And go ahead and post any other questions you might have.
This message has been edited since posting. Last time this message was edited on 28. July 2004 @ 20:16
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TheBlarg
Newbie
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28. July 2004 @ 21:28 |
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Yes, what carefully scripted good advice. I wish that all of the users on this site were as articulate as TheTorg.
But -- what about poop?
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