File size in AutoGuardian Knot???

[go4saket]

Hi Guys!

I am using AGK to convert my home videos to XVID format. The spec. of source video is as follows...

File : 1.00 GB (1011 MB), duration: 0:22:43, type: MPG, 1 audio stream(s), quality: 75 %
Video : 974 MB, 6000 Kbps, 25.0 fps, 720*576 (4:3), MPG2 = MPEG 2 (SVCD/DVD)
Audio : 36 MB, 224 Kbps, 48000 Hz, 2 channels, 0x51 = Mpeg-1 audio Layer 2 [0xc0]

I want to convert the same to XVID. The video in this example is of 22 Min 43 Sec. What is the target size that I should give so that I dont loose quality.

Please tell me as to how much MB should I allot to per minute of video.

Apart from this, I tried to convert the above video in AGK 2.4, alloting it a size of 230 MB with CBR MP3 128 Kbps, but the sound doesnt synchronize with the video. What can I do to overcome this.

Thankyou.

[CWR03]

I want to convert the same to XVID. The video in this example is of 22 Min 43 Sec. What is the target size that I should give so that I dont loose quality.
You will always lose quality when converting to Xvid, even if the end file is bigger than the source. You can minimize loss with a larger file size, but no one can determine what your needs will be or with what level of loss will be acceptable to you. That can only be determined by yourself and some experimentation.

As far as the audio synch problems, that has been asked and answered so many times there's a sticky on the subject.

[weaver4]

According to the tutorial 75% will give you excellent quality, and going above 80% adds nothing to quality.

I use 75% quite often and generally the final file size is 1/3rd of the original. You will lose a little bit of quality by going to 67% but the filesize will be reduced to appox 1/4 the original filesize.

But, it can very considerably on certain movies.

[aldaco12]

My 'rule of thumb' is than, for an approx 2h movie:
- 700 MB (1 CD-R) gives good quality;
- 1400 MB (2 CD-R) gives you optimal quality.
The difference is noticed more on large TVs; it, of course, is not noticaeble on a small screen TV.
Obviously, quality changes a little depending upon movie's type (fast action movie or dramatic), but I found my 'rule of thumb' adequate.
AS an example, this 'rule' creates 1 CD movie of approx 50% quality. Accoring to my 'rune of thumb', a 23' movie should be as large as:
23'/120' * 700 = 133 MB
for a good quality AVI, double for optimal quality.
You could make a test putting both 'categories' in a CD-RW (GOOD.AVI and EXCELLENT.AVI in both disc) and then decide by yourself.

Remember that:
- if you put equal length AVI in a CD-R the 'sample magnitude' is 700/N MB, so 700, 350 or 175 MB.
- if you put equal length AVI in a DATA DVD the 'sample magnitude' is 4489/N MB, so 1496, 748, 374 or 187 MB.
I use this 'sample magnitude' when I encode TV series in a DVD. Choosing 374 MB I am able to put 12 episodes in a DVD-R, and since an episode is 45'-50' long, so its 'sample sizes' would be
- 50'/120' * 700 = 291 MB for good quality
- 50'/120' * 1400 = 583 MB for optimal quality
and therefore I could appreciate that 374 MB is a little more (+128%) than 'good' quality and less (64%) than 'optimal' quality.