Understanding the Quality of an AVI File

LFC5Times

Ok,

I have 3 avi. files on my computer which I plan to burn to discs.

How do I know how good the quality of the AVI file is from the below data:

Thanks in advance

AVI File (1) -

Size - 700 MB

Image

Width - 416 Pixels
Height - 304 Pixels

Audio

Duration - 01:43:02
Bit Rate - 116kbps
Audio Format - MPEG Layer-3

Video

Frame Rate - 25 frames/second
Data Rate - 928 kbps


AVI File (2)

Size - 701 MB

Image

Width - 560 Pixels
Height - 240 Pixels

Audio

Duration - 01:35:39
Bit Rate - 128kbps
Audio Format - MPEG Layer-3

Video

Frame Rate - 25 frames/second
Data Rate - 1001 kbps


AVI File (3)

Size - 1.37 GB

Image

Width - 720 Pixels
Height - 384 Pixels

Audio

Duration - 02:05:24
Bit Rate - 448kbps
Audio Format - Blank

Video

Frame Rate - 25 frames/second
Data Rate - 1528 kbps

Dublin_Gunner

You don't. You'll have too look at the video.

I could record a crappy mobile phone video, and re-encode it with a really high bit rate & lossless format, and the file size and bit rate would be huge, but it would still look crap.

Generally though, if you know what the video is, and know what it should look like, a high bitrate (data rate) for the same resolution should be a better quality video - but then you have to know what codec was used to encode it also, h.264, divX etc

For a start, your 3 AVI's are at different resolutions, so they could be cropped / stretched / squashed.

You haven't stated what codec they're encoded with, or do you know what the quality of the original video is like.

So, as I said, the best thing to do is look at all 3 (I'm assuming they're the same video?) and decide for yourself.

Voodu Child

Looking at the filesizes, they seem a little familiar. 1400MB and 700MB are commonly used for certain types of movies (the types you get from your 'cousin' :pac:). They all likely use old Xvid video compression.

Video 3 is the highest quality technically. Its got a good video bitrate, full-SD resolution and full AC3 audio.

Video 1 and 2 are both crap.

Thats assuming the source for all the movies is good etc. It may not be as mentioned in the post above.

LFC5Times

Voodu Child wrote: »

Looking at the filesizes, they seem a little familiar. 1400MB and 700MB are commonly used for certain types of movies (the types you get from your 'cousin' :pac:). They all likely use old Xvid video compression.

Video 3 is the highest quality technically. Its got a good video bitrate, full-SD resolution and full AC3 audio.

Video 1 and 2 are both crap.

Thats assuming the source for all the movies is good etc. It may not be as mentioned in the post above.

Theyr movies alright, though not of the blue kind.

Yeh one of the first two movies is a real old one from the early 90's so had an idea the quality wouldn't be great.

Overheal

I torrented Iron Man once. 1.2gb file. There were 4.9gb files too. But you couldnt convince me there was a difference; the first one was as 1080p as cheese is delicious. If there was a difference, it wasnt enough to justify the 4x bigger filesize.

The numbers can lie. Most of the time you just have to use your eyes and ears.

ED E

Movies in Divx:
700MB
624x352(Or 640x480)
6000Kbps
mp2/mp3/AAC audio - 128/192

Thats decent for watching windowed, and as above is generally used by "cousins".[Use this profile for Youtube ups myself, with smaller files of course]

If you want to watch on a DVD player I'd upscale it to an mp2 mastered DVD with a video suite/encoder. Again, decent results, nothing magical.