For video size, encoder (Format) and Bit Rate of the video are turned out to be the most important reference indexes. In broad terms, the video size is determined by bit rate. Under the same definition, the higher bit rate the video possesses, the bigger the video size is.
Commonly for a DVD, it will tend to have a different output format, depending on the encoding methods. For instance, when converting a DVD the output file will be applied with 1 – 0.2 format provided that the DVD originally adopts XVID coding (AVI, M4V).
After the conversion of a DVD or video, the size of source file and output file may differ widely. It is not wise to directly convert it by your own efforts. It's well worth drawing support from a professional and efficiency video converter, namely a "
reduce video file size software" here, or "shrink video converter", because it could help you regulate the video size.
(http://www.videoconverterfactory.com/tips/imgs-new2/reduce-video-file-size-3.jpg)
1. Add files/Load DVD. This software supports a batch converting mode, which allows you to convert multiple videos at a time.
2. Click "Settings" button to go to the settings page. Hit the drop-down menus of "Encoder" and "Bit Rate", select an available encoder or an exact parameter of bit rate. You will be prompted for the predictive size after each adjustment.
3.Return to the main interface and click "Run" to start the video conversion.
I believe this is quite impossible. You cannot have the same quality with decreasing the size of the video. A friend of mine tried doing it for his report with
labreportwriter.com and nothing worked. Probably he used a totally different tool, but still I believe no matter whatever you use it will be hard to achieve this.
Alternatively, this
media cutter is also a professional one that can cut needless sections off to shorten file size. It besides let you adjust parameters, like bit rate, codec, resolution, sample rate, channel, etc. in your own way.
You are as well allowed to
cut YouTube videos as you wish