Convert 1080p to 720p?

[mhale62]

Hi,

I've got several 1080p rips and my HDTV is only 720p, is there any way I can dump the extra bits, as it were?

Metta (http://en.wikipedia.org/wiki/Metta),
m

You can see by my sig I can run pretty much any tool(s) necessary…if I can figure 'em out ;)

[Comatose]

Can't you just send it as is to your TV as 1080p? Your TV will downsize it... or are you getting some artifacts when doing this?

[wyti]

but if you want to resize, you must reencode it, for this, try avisynth for the resize, and if you're in this forum, i think you want to encode it with an mpeg4 AVC codec, x264 is free and open source, and accept avs script in input.

[mhale62]

Can't you just send it as is to your TV as 1080p? Your TV will downsize it... or are you getting some artifacts when doing this?
That's what I'm doing currently but I'd like to recover as much drive space as possible, the difference between 1080 vs. 720 is a few GBs per vid so it adds up.

[mhale62]

but if you want to resize, you must reencode it, for this, try avisynth for the resize, and if you're in this forum, i think you want to encode it with an mpeg4 AVC codec, x264 is free and open source, and accept avs script in input.
Yup, reencode it is. I'll have a go a avisynth, thanks.

I definitely want x264 mpeg4 but I'm unsure why nearly all the rips I see are in matroska containers. Is there something inherently better about it?

Thanks to both of you for your quick responses.

m

[wyti]

because you can't put h264 in an avi container, and mp4 can't contain ac3 audio (5.1)

[mhale62]

Perfect! Now I know a little more.
I'm in the right place alright.

Much obliged, wyti

[jwhyche]

In theory you should be able to feed it right into staxrip and have it do the resize for you. I know it can redo mkv containers but I don't know about about thing else such as mp4 or avi.

[mhale62]

Thanks, I just d/led staxrip, I'll have a go when I get some free CPU cycles ;)

[jakor]

because you can't put h264 in an avi container, and mp4 can't contain ac3 audio (5.1)
what is the problem with putting h264 into avi ? Presence of b-frames and backward prediction easily is solved by putting sequential P and B frames into one frame and correcting its time.

[Ranguvar]

what is the problem with putting h264 into avi ? Presence of b-frames and backward prediction easily is solved by putting sequential P and B frames into one frame and correcting its time.
Mostly? It's unstable, and can have weird problems.

AVI is a positively ancient container, and even putting ASP video into it was kinda weird.

For most general purposes, it's just not smart. And now we're reaping the rewards of rejecting AVC-in-AVI - MP4 and MKV are getting more and more supported by standalones.

[Sharktooth]

AVI is an aberration, it's no good for no one.
if AVI and VFW never existed we would already had lots of tools like virtualdub direclty supporting MP4, MKV and MPEG TS and PS.
yes, i know about avidemux,ancd few other editors...
the point is, stop supporting dinosaurs, and you'll find much better solutions and tools.

[jakor]

Mostly? It's unstable, and can have weird problems.

AVI is a positively ancient container, and even putting ASP video into it was kinda weird.

For most general purposes, it's just not smart. And now we're reaping the rewards of rejecting AVC-in-AVI - MP4 and MKV are getting more and more supported by standalones.

What you tell is just general words, nothing in details, no specific objection against AVI container,
yes, I totally agree that avi container is a kind of old, but if it can successfully solve all the problems with storing all videoformats in this simple way - why should we go in making things more complex not having a really strong need in ?

Recently I used VFW interface in my application to decode h.264 stream, and after using all these complicated commercial interfaces which were made "to make programmers life easier" I felt a big relief how simply you can do all this codec stuff.

[shirohamada]

get another 750GB hdd. those are cheap now.
saves on electricity

[Blue_MiSfit]

Yeah...

You're going to loose a lot of quality re-encoding down to 1080p... Not worth it IMO

~MiSfit