Need expert advice on MeGUI profile

kosmonaut · 19th February 2009, 22:01

I'm trying to come up with a usable MeGUI profile for the G1 Android phone from T-Mobile. It's a pretty cool phone, but the documentation for its video playback capabilities has been sorely lacking. So, playing around with the MeGUI iPhone/iPod/Zune profiles and testing many, many files, I've got some initial encoding settings that seem to work.

But I'm still pretty n00bish when it comes to x264 profiles, so any advice you guys have on how to make it more efficient would be very, very helpful.

I should say so far the phone is very tolerant of higher bitrates, but not larger resolutions. Also, CABAC is an absolute no go.

Code:

cabac=0 / ref=2 / deblock=1:1:0 / analyse=0x1:0x111 / me=umh / subme=6 / psy_rd=1.0:0.0 / mixed_ref=1 / me_range=12 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=3 / nr=0 / decimate=1 / mbaff=0 / bframes=0 / keyint=250 / keyint_min=25 / scenecut=40(pre) / rc=crf / crf=20.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00

Thanks!

nurbs · 20th February 2009, 01:18

You should be able to raise --subme (to 8; since you don't use b-frames 7 won't change anything and 9 will be same as 8), which is a good choice if you have psy-rd activated. Apart from that not much you can do. Trellis needs CABAC unfortunately. You could set me-range back to 16, but that probably won't do much.

kosmonaut · 20th February 2009, 08:33

Thanks nurbs, I will try those suggestions out. Anybody else got some feedback? Is crf=20 overkill for a 480x320 screen?

Sharktooth · 21st February 2009, 02:55

CRF is a sort of index of quality. CRF will result in higher bitrates at higer res and lower bitrates at lower res.
so, no it's not an overkill. if you're satisfied with CRF 20 quality then CRF 20 is good.

kosmonaut · 21st February 2009, 22:24

Sharktooth, thanks for the info, it helps.

One other question, is there a procedure to get a profile included in the presets that get offered to MeGUI users? I realize the settings are not all that different from iPod/iPhone settings, but I think it would help other Android users so they don't have to figure it out for themselves.

Sharktooth · 22nd February 2009, 03:59

procedure?
you just make and test it and if it works, post it.
i'll include it in megui.

kosmonaut · 22nd February 2009, 10:16

Great, I'll do that. I'm still testing a few things, but I'm close to being finished with it.

kosmonaut · 25th February 2009, 20:21

Ok, after quite a bit of testing different encoding options to make sure they worked on the Android G1 phone, and then doing a whole bunch of PSNR and SSIM comparisons, to make sure I wasn't producing compliant but low quality video, I believe the profile is ready.

If anybody wants to take a look and has any feedback (positive or negative) just let me know here or PM me. Just remember the phone is super picky about resolution and won't play anything with a width over 480. Also, I went with CRF since there is no specific size requirement that I could find.

Otherwise, I think it's ready to be included in MeGUI if that's cool with Sharktooth.

kosmonaut · 16th March 2009, 17:56

Going to respond to my own post

but just an update, I've put together a step-by-step guide to encoding with MeGUI for the Android G1. Check it out here.

b66pak · 16th March 2009, 20:24

thanks...
_

Sharktooth · 19th March 2009, 14:09

@kosmonaut: i've included a modified version of your preset into megui auto-update.
i've changed it to 2 pass since CRF is not so happy with VBV restrictions. I've also set ME-Range to 16.

19th February 2009, 22:01	#1 \| Link
kosmonaut Registered User Join Date: Apr 2005 Location: San Diego, CA Posts: 90	Need expert advice on MeGUI profile I'm trying to come up with a usable MeGUI profile for the G1 Android phone from T-Mobile. It's a pretty cool phone, but the documentation for its video playback capabilities has been sorely lacking. So, playing around with the MeGUI iPhone/iPod/Zune profiles and testing many, many files, I've got some initial encoding settings that seem to work. But I'm still pretty n00bish when it comes to x264 profiles, so any advice you guys have on how to make it more efficient would be very, very helpful. I should say so far the phone is very tolerant of higher bitrates, but not larger resolutions. Also, CABAC is an absolute no go. Code: cabac=0 / ref=2 / deblock=1:1:0 / analyse=0x1:0x111 / me=umh / subme=6 / psy_rd=1.0:0.0 / mixed_ref=1 / me_range=12 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=3 / nr=0 / decimate=1 / mbaff=0 / bframes=0 / keyint=250 / keyint_min=25 / scenecut=40(pre) / rc=crf / crf=20.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 Thanks!

21st February 2009, 02:55	#4 \| Link
Sharktooth Mr. Sandman Join Date: Sep 2003 Location: Haddonfield, IL Posts: 11,768	CRF is a sort of index of quality. CRF will result in higher bitrates at higer res and lower bitrates at lower res. so, no it's not an overkill. if you're satisfied with CRF 20 quality then CRF 20 is good. __________________ MPEG-4 ASP Custom Matrices: EQM V1(old), EQM AutoGK Sharpmatrix (aka EQM V2), EQM V3HR (updated 01/10/2004), EQM V3LR, EQM V3ULR (updated 04/02/2005), EQM V3UHR (updated 17/12/2004) and EQM V3EHR (updated 05/10/2004) Info about my ASP matrices. MPEG-4 AVC Custom Matrices: EQM AVC-HR Info about my AVC matrices My x264 builds. Mooo!!!

21st February 2009, 22:24	#5 \| Link
kosmonaut Registered User Join Date: Apr 2005 Location: San Diego, CA Posts: 90	Sharktooth, thanks for the info, it helps. One other question, is there a procedure to get a profile included in the presets that get offered to MeGUI users? I realize the settings are not all that different from iPod/iPhone settings, but I think it would help other Android users so they don't have to figure it out for themselves. Last edited by kosmonaut; 21st February 2009 at 22:37.

22nd February 2009, 03:59	#6 \| Link
Sharktooth Mr. Sandman Join Date: Sep 2003 Location: Haddonfield, IL Posts: 11,768	procedure? you just make and test it and if it works, post it. i'll include it in megui. __________________ MPEG-4 ASP Custom Matrices: EQM V1(old), EQM AutoGK Sharpmatrix (aka EQM V2), EQM V3HR (updated 01/10/2004), EQM V3LR, EQM V3ULR (updated 04/02/2005), EQM V3UHR (updated 17/12/2004) and EQM V3EHR (updated 05/10/2004) Info about my ASP matrices. MPEG-4 AVC Custom Matrices: EQM AVC-HR Info about my AVC matrices My x264 builds. Mooo!!!

19th March 2009, 14:09	#11 \| Link
Sharktooth Mr. Sandman Join Date: Sep 2003 Location: Haddonfield, IL Posts: 11,768	@kosmonaut: i've included a modified version of your preset into megui auto-update. i've changed it to 2 pass since CRF is not so happy with VBV restrictions. I've also set ME-Range to 16. __________________ MPEG-4 ASP Custom Matrices: EQM V1(old), EQM AutoGK Sharpmatrix (aka EQM V2), EQM V3HR (updated 01/10/2004), EQM V3LR, EQM V3ULR (updated 04/02/2005), EQM V3UHR (updated 17/12/2004) and EQM V3EHR (updated 05/10/2004) Info about my ASP matrices. MPEG-4 AVC Custom Matrices: EQM AVC-HR Info about my AVC matrices My x264 builds. Mooo!!!

20th February 2009, 01:18	#2 \| Link
nurbs Registered User Join Date: Dec 2005 Posts: 1,460	You should be able to raise --subme (to 8; since you don't use b-frames 7 won't change anything and 9 will be same as 8), which is a good choice if you have psy-rd activated. Apart from that not much you can do. Trellis needs CABAC unfortunately. You could set me-range back to 16, but that probably won't do much.

20th February 2009, 08:33	#3 \| Link
kosmonaut Registered User Join Date: Apr 2005 Location: San Diego, CA Posts: 90	Thanks nurbs, I will try those suggestions out. Anybody else got some feedback? Is crf=20 overkill for a 480x320 screen?

22nd February 2009, 10:16	#7 \| Link
kosmonaut Registered User Join Date: Apr 2005 Location: San Diego, CA Posts: 90	Great, I'll do that. I'm still testing a few things, but I'm close to being finished with it.

16th March 2009, 17:56	#9 \| Link
kosmonaut Registered User Join Date: Apr 2005 Location: San Diego, CA Posts: 90	Going to respond to my own post but just an update, I've put together a step-by-step guide to encoding with MeGUI for the Android G1. Check it out here.

16th March 2009, 20:24	#10 \| Link
b66pak Registered User Join Date: Aug 2008 Location: The Land Of Dracula (Romania - EU) Posts: 934	thanks... _