Reducing framerate and video dimensions doesnt decrease filesize?! WHY?

[boskins]

I have a series of videos which are to be published to the web as embedded swfs. i run a mac, the videos are .movs currently and i am using iSkysoft's Video Converter.

I am trying to get the files size to a minimum. The problem i am having is thus: the only setting which seems to have any effect on the file size is the altering the bitrate.

Reducing the framerate does nothing - that makes no sense to me - can someone explain?
shrinking the dimensions of the video also does absolutely nothing - can someone please explain this?

The videos are to be imported into flash as embedded swf (which significantly increases file size) to have animation layered on top. I need to know i have done everything within my power to get these videos as small as possible - so bringing my attention to anything which may help my cause would help MASSIVELY!

Any input or advice would be very much welcomed!!

thanking you in advance

Danny

[Baldrick]

The only thing that reduce the file size is the video and audio bitrate(in some converting programs also just named as different quality settings like low,high, etc). Check if you can lower it in your video converting programs.

Are you making the swf in iskysoft? or?

[jagabo]

The universal rule in video:
file size = bitrate * running time

Frame rate and frame size do not effect the file size. What they do effect is the quality of the resulting video. Larger frame sizes and higher frame rates will require more bitrate to maintain quality.

Automotive analogy:

range = gallons * miles-per-gallon

If the vehicle gets 30 miles-per-gallon it will go 30 miles on one gallon of gas. The size and shape of the vehicle is immaterial to this calculation. Obviously, it's hard to make a very large, heavy vehicle that gets 30 MPG, just like it's hard to make a large frame, high frame rate video look good at low bitrates.

[RabidDog]

Sounds like a fault of the software, Reducing framerate and/or reducing frame size are the best things to reduce bitrate. Think of bitrate as grass seeds, the frame is the the size of field you are trying to enlawn, as the field size gets bigger the coverage (bitrate) will get worse, ending up with a sparsely covered field. Obviously reducing frame size will reduce detail somewhat, and reducing framerate will show as jerky motion. Your software has only one control, bitrate...but hey Its apple, its movs and swf, a fairly quirky assortment.. Reducing the bitrate in line with reducing the frame-size and frame rate is your best bet, for the same or similar quality output.

[Midzuki]

Quality-based encodings can "transform" reduced framerate and
reduced frame size into less bitrate. The question is, is the application you chose
capable of encoding with constant-quality/-quantization



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