Wow David, That was a great explanation and I saw the differences in the examples at the link. Of course now, you know some of us would some explanation of some of the points that you made... I should say that I was trying to shrink the overall size of a 6 min avi file to something that would fit on cd, so a client could upload to a server for streaming.. I was in the export setting box, but it sounds like the same principles are involved... Frame Rate: I thought if I changed the frame to something lower it have the effect of changing the duration, and/or the playback speed. I mean, if I taped at 30fps, what happens if I encode at 15fps? How will it affect quality of playback, and how will it affect the final size of the file? Keyframing: What's that all about ? I know how it works in editing, but how does it work in encoding? Data Rate: How does the data rate effect playback and size? Is higher better? of lower? should I "recompress" always, or what? Maintain data rate? LOL I'm totally lost in this area.. I appreciate any help you can give me on this. If there is some link you know with this information, I would appreciate that as well. Thanks a lot (I'll definitely be saving this answer you gave about encoding for the net) -Frank www.Time-LineProductions.com David Hurdon <[EMAIL PROTECTED]> wrote: I don't see myself quoted often, here or anywhere else, so thanks Stuart for your kind words. My comments related to a specific question and while some are relevant to Renee's objective, I'd amend my answer somewhat for this situation.
The four biggest impacts on the quality and size of a web compression are resolution (width and height in pixels), frame rate, key frames and source material. The last one is the first consideration. If it is made up of high motion it will be difficult to impossible to make a small file that looks good. High motion doesn't just mean kick boxing or extreme skiing. It can be short clips, zooms, pans and tilts, noise from analogue conversion, effects and dissolves - anything that requires the encoder to spend precious bits wastefully. If the source material isn't challenging, try 320 X 240 at 15 fps and note the number of key frames in the default. If you don't like the size results but the quality is ok, do it again with fewer key frames. The URL below links four video files I recently did with Procoder Express. If you look at #3 and 4, you will see the difference the extra bits make, and where. You can also decide whether either version is up to your quality objective. The first (3) is at a combined data rate of 108 kbps, while #4 is at 272 kbps. I usually don't encode at that low a level but for this project I needed to experiment at that end. http://www.contentshop.tv/procoder.htm David Hurdon At 06:28 PM 4/5/2005 -0700, you wrote: Hi! I have a 5 minute video clip, which needs to be compressed for internet. I created windows media 9 version for 256 k download and the file size is 11+ MB. Earlier I have had good results with this format for web movies. But this one, I am not happy with the resolution, and need to bring the file size to about 5 MB. What do I need to do. I could create WMV for 128 K, to reduce the file size but that would also compromise the resolution further. How do I get better results than I have and a smaller file size. Would appreciate inputs on how to achieve this. Thanks. Renee --------------------------------- Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Adobe-Premiere/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. [Non-text portions of this message have been removed] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Adobe-Premiere/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
