Explain video formats to me...

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Pietrach

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Hi
I have recently purchased a simple HD camcorder. It produces 1080p vidoes in MP4. However, these are terribly slow on my computer so I decided to convert these to something else. Converting to DVD format MPEG produces almost the same size of the file, the quality drops but it plays smoothly. Other attempt was converting to Avi. This produced over 3x the size of the file but quality remained the same (or very nearly) and it does play smoothly.

now, can you explain to me the following , considering I know absolutely nothing about video formats, codecs etc.

1) why Avi file which is 3x the size of original MP4 plays smoothly and MP4 doesnt?

2) does the avi video remains HD or it is not an HD video any more?

3) whats the benefit of MP4?

Thanks a lot.
 
Pietrach said:
all i described was on VLC player :/
Click to expand...

interesting.

the AVI will be bigger as MPEG compresses better.

regarding HD, thats a very open ended question based on what you define HD as. in my opinion HD content must be at least 1080 (1920x1080 resolution) and 24fps. you could have that though and still have a naff encode though if your conversion source/program wasnt the best.

if the AVI plays back fine it could be codec or machine performance.
 
id have thought mp4 would have played better how many fps is your camcorder id say its the way your camcorder is compressing the mp4 , out the lot mp4 is the smallest source file i used to compress a dvd down to in the region of 300mb-700mb but to do a dvd in mpeg it would have been 1 gig easy avi would have been close to the size of the mp4 have you ran a diff mp4 file ? ie is every mp4 file playing slow on your pc?
 
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