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Looper's Delight
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Wow, I've learned a lot from this thread. I discovered yesterday that the mpg files that I ripped from my looping DVD were of this nature: > File type: .mpg (MPEG-2) > Data rate: 1666 KB/Sec > Frame Rate: 29.97 fps > Video size: 720 X 480 So, I guess it was better that I went to MPEG-2 and not MPEG-4. I don't think my program had the MPEG-4 option, but the MPEG-2 seem to look fine, even when I burn back to DVD. In fact, this is what I did for my promo DVD. So is .avi even better than all of these because it is not compressed? I noticed my USB enabled microscope and software program converts my microbiological videos to .avi,and they are huge! If figured they might be the video version of a .wav file, the raw deal. Incidentally, I was experimenting with the trial-ware for Sorensen, than realized that I had Adobe Premier 6.0...I forgot....whoops. It has a cool Real Audio integration function called Cleaner, and a great wizard for exporting my MPEG-2 files as Real Audio, but Primier also allows me to export to windows media and Quick-Time as well, and I think a few other formats. So far, so good...keeping the quality I wanted and the file size down. The only downfall is the the Primier rendering time is horendous! I could have lunch and take a nap in between each file converstion. Cheers, Kris ________________________________ From: goddard.duncan@mtvne.com [mailto:goddard.duncan@mtvne.com] Sent: Friday, June 24, 2005 7:03 AM To: Loopers-Delight@loopers-delight.com Subject: RE: OT- Loop Videos / How to get file size down! >> I can see and edit both audio and video separately with these large .mpg files that I rip from DVD. You were saying that you don't get this with mpeg, correct? << mpg & mpeg are the same thing. mpg is one of the file extensions used by mpeg files. just like jpg & jpeg, in fact. joint picture experts group & motion picture experts group, from whence we get these acronyms, were cross-industry bodies established to define (by a combination of committee & consensus) a series of standards for exchange of media. the jpeg one was reasonably straightforward, though we've still ended up with a few different flavours. mpeg is another matter. it evolved from m-jpeg (motion jpeg) & differs from it crucially in that motion interpolation is performed to further reduce file size. thus, if there isn't much difference between one frame & the next (i.e. not much movement), only the differences need be encoded. all this "council" could do meaningfully, given that requirements vary from mobile/broadband right through to digital cinema, was establish a set of fairly rigid guidelines for each version of mpeg, defining how the files were to be constructed, what media elements each could include & so forth. bitrates are left to the user. mpeg-1 was the first stab at it, & layer-3 of mpeg-1 is the bit that carries the audio. nowadays this is known as mp3. mpeg-2 was a significant improvement, introducing b & p frames (so that the interpolation amongst frames is bidirectional; the frames have to be sent to the decoder in the wrong order for this to work, which is why mpeg-2 as used for live television broadcasts has so much latency). mpeg-2 is also used for dvd. does anyone know the difference between m-jpeg & i-frame-only-mpeg-2? :-) there isn't an mpeg-3 because of the widespread misuse of the abbreviation mp3 to refer to the layer 3 (audio) component of mpeg-1. mpeg-4 is the latest flavour in serious use, exploiting better compression algorithms that have come along recently, though it has yet to be demonstrated as useful to high-end users. wm9 rivals it & looks the likelier of the two to be adopted for broadcast. there are other flavours of mpeg too- 7, 21.... some of these are designed to use media that's already stored in the decoder- bitmaps, fractals & so on- to reconstruct sound & images using a set of instructions that's sent in place of much of the raw data. google away. ok. enough. back to looping. duncan/r.m.i. & mtv. ************************************************************************ *** CONFIDENTIALITY NOTICE The contents of this e-mail are confidential to the ordinary user of the e-mail address to which it was addressed, and may also be privileged. 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