1080p to 720p or dvd

[Johnyd]

I have some HD-DVD movies that I am attempting to achieve onto an external harddrive to play on my laptop, but my laptop is having troubles playing back the 1080p rips that Ive made. Currently I am just remuxing the raw streams from the .evo's into .mkv files. These are proving too much for the laptop so Im going to have to make them smaller. If I transcode to h264 at dvd size will it go at roughly the same speed as transcoding a dvd?
Will it look terrible compared to a dvd encoded with the same settings?
720p goes at roughly 10fps on a single pass:
CQ 22, 3 b-frames, b-pyramid, 3 reference frames, weighted refs, weighted b-frames, me=uhm, subme=5, no-fast-p-skip
1080p 2.79fps

core 2 duo t5450 1.66ghz CPU

[CWR03]

If I transcode to h264 at dvd size will it go at roughly the same speed as transcoding a dvd?
It can take a long time, several hours to a day depending on your hardware and the selected output resolution.

Will it look terrible compared to a dvd encoded with the same settings?
There are no "same settings" as a DVD with h264, but you can get a file easily down to half that of a raw DVD MPEG-2 file and still retain very good quality. On a laptop display it might even be indistinguishable from a DVD, especially with a high-quality source such as HD-DVD.

[Johnyd]

It can take a long time, several hours to a day depending on your hardware and the selected output resolution.

Im asking if transcoding my 1080p video with dvd output resolution will be roughly as fast as having a dvd source and outputing to dvd resolution.


There are no "same settings" as a DVD with h264,

I mean using the same settings in x264 as I do when I transcode my dvd's. Sorry if I wasnt clear.

[CWR03]

I don't know if the input file has any effect on encoding speed, but you should be able to tell pretty quickly once you start an encode by looking at the fps provessing speed.

[dat720]

With "High Quality" h264 settings my PC is able to transcode a 1080P HD/BD at roughly 6-10fps (more if i loose some quality settings), that puts a a 2 hour movie at roughly 6 hours to transcode.

Even if you reduce the resolution to "DVD Size" it will still take much the same amount of time, it may be a little bit quicker, but re encoding BlueRays to 720px??? you might aswell buy DVD's and not BD's.

[setarip_old]

@dat720

Hi!but re encoding BlueRays to 720px??? you might aswell buy DVD's and not BD's.Are you suggesting that 720p is only equal to and not any better visually than 480i?

[nurbs]

I think he meant DVD resolution. Anyway the downconverted blu-ray will probably still be better than the dvd.

[CWR03]

Even if you reduce the resolution to "DVD Size" it will still take much the same amount of time
I think the main question is whether the input file being 1080p instead of 480i will affect the encoding speed. I can't answer that because I haven't gone hi-def on anything yet.

[Video Dude]

I think the main question is whether the input file being 1080p instead of 480i will affect the encoding speed. I can't answer that because I haven't gone hi-def on anything yet.
Yes it should take slightly longer depending on the decoder used and the speed of the machine. There a lot more "bits and pixels" in a 1080p frame compared to a DVD's 480p frame. In additon, h.264 and even HD VC-1 are a lot more demanding to decode compared to a mpeg-2 480p stream.

[setarip_old]

Anyway the downconverted blu-ray will probably still be better than the dvd.My point, exactly ;>}

[Johnyd]

Im trying a one atm with the output resolution set to 720p using spline resize and sharpen 0,2 which was the default settings in ripbot264. Going 10-12fps for a single pass vs the 3fps max I got on the 1080p output. Dont think I'll bother going down to dvd size if this works properly.

[dat720]

@dat720

Hi!Are you suggesting that 720p is only equal to and not any better visually than 480i?

I meant 720px wide.....

The gain vs effort/time required to convert a Blu Ray to 720x480/576 is small enough that you may aswell use DVD source in the first place.

[setarip_old]

@dat720

Thanks for clarifying ;>}

Although there are many who believe it is worth the effort...

[dat720]

I know, i was just putting forward my thoughts....

I personally don't see the point in having BluRays or HD's unless i can enjoy thier 720p/1080p goodness!

And believe me it is good on a 60" Rear Pro!

[Blue_MiSfit]

I think you'll be very pleased with 720p ;)

~MiSfit