need info on h.264 torrents

[westcoastgsr]

I was looking at the info provided on different torrents of the same movie. I was wondering why a file would be larger than the other. Both have DTS which I dont think you can shrink (could be wrong). One is 1080p the other 720p BUT the 720p file is larger? shouldnt the 1080p be larger? or is it something to do with the bitrate? Is there a rule of thumb on what type of Bit and Frame rate to look for?

Here is the 1080p info 5.45GB:

Format : Matroska
File size : 5.45 GiB
Duration : 2h 24mn
Overall bit rate : 5403 Kbps

Video
ID : 1
Format : AVC
Format profile : High@L4.0
Format settings, ReFrames : 5 frames
Duration : 2h 24mn
Bit rate : 3759 Kbps
Nominal bit rate : 3889 Kbps
Width : 1920 pixels
Height : 1080 pixels
Display aspect ratio : 16/9
Frame rate : 23.976 fps

Audio
ID : 2
Format : DTS
Codec ID : A_DTS
Duration : 2h 24mn
Bit rate mode : Constant
Bit rate : 1536 Kbps
Channel(s) : 6 channels
Sampling rate : 48.0 KHz

720P 7.92GB:

RUNTIME.......: 2h:23m:42s
SIZE..........: DVD9 7.92
VIDEO CODEC...: x264, 2pass, L4.1
FRAMERATE.....: 23.976 fps
BITRATE.......: Variable ~ 6375 Kbps
RESOLUTION....: 1280x536 (2.38:1)
AUDIO.........: English DTS 5.1 @ 1536 Kbps
SUBTITLES.....: English.srt
SOURCE........: 1080p Blu-ray AVC
GENRE.........: Action | History | War
IMDb RATING...: 7.6/10 (79,064 votes)
IMDb LINK.....: www.imdb.com/title/tt0265086/
ENCODER.......: karakoto007
RELEASE DATE..: 28/01/2009

[woob]

looks like the 720p was ripped specifically to fit onto a DVD9, hence the standard 7.92 filesize. What is the filetype of the 720p? I doubt it's mkv as well.... 720p Matroska files usually end up being ~4-6GB for a full-length movie

[underscore]

look at the bitrates. sure one has a resolution of 1920x1080 pixels, but what is contained in those is probably compressed. higher bitrate = smoother video. I'm not sure at what rate it becomes noticeable tho.

[dton13]

From what I can see, looks like the big diff here is the bit rate and the 2nd pass with the encoder...not too sure without further checking.

[mr_chin]

From what I can see, the 720p is ripped from a 1080p DVD. The aspect ratio also plays a major part, because the 720p is approximately 21:9 while the 1080p is 16:9.

So when you put the 720p on a, say, 60 inch TV, compare to the 1080p on a 60 inch TV, the 720p will be much much better.

The 1080p seems like it's ripped from a regular DVD rather than a HD/Bluray DVD because of the bitrate. Higher bitrate performs (less lag) better when you are watching scenes with fast moving actions.

[westcoastgsr]

Originally Posted by aznlangjai

From what I can see, the 720p is ripped from a 1080p DVD. The aspect ratio also plays a major part, because the 720p is approximately 21:9 while the 1080p is 16:9.

So when you put the 720p on a, say, 60 inch TV, compare to the 1080p on a 60 inch TV, the 720p will be much much better.

The 1080p seems like it's ripped from a regular DVD rather than a HD/Bluray DVD because of the bitrate. Higher bitrate performs (less lag) better when you are watching scenes with fast moving actions.

so on the 720p version there will be the black bars? I'm not understanding why the 720p would look better (from your comment)?

[underscore]

what he's saying (more or less) is that the one that is "1080" probably didn't come from a 1080p source. *technically* it has 1920x1080 pixels, but it's been upconverted from say 480p.

If you're still not sure then DL both and compare, but I'm pretty sure the 720p one will be better because it is most likely 720p source ripped to 720p file, vs 480p (guessing) source to 1080p.

[westcoastgsr]

oh ok that make sense (but why would someone upconvert? doesnt make sense to me). I guess I really need to make sure I look at the source.

Also if someone shrunk a bluray 1080p down to say 1080p 4gb size the bitrate will be lower thus a 720p 4gb would probably look better with a higher bitrate??? yes? no?