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Old 4th April 2005, 09:05   #1  |  Link
Amdh
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Need Advice On X264 Settings !


Hi Everyone in doom9 !
Well .. I have lately Started Using X264 In Order to Compress Slow Motion TV Show Of About 30 Minutes ! However I am still confused and I need advice about the perfect Profile For Such Compression !
Thank U In Advance !
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Old 4th April 2005, 10:54   #2  |  Link
namchik
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Hi
don't know about the perfect profile but with x.264 rev.184 I sticked to default settings and set only deblocking strength to "1"
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Old 4th April 2005, 14:22   #3  |  Link
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Speaking of the settings, has anyone written down what they all do anywhere? I've tried searching for anything that explains all the settings, but I'm not coming up with anything. After encoding with nothing but xvid for the past many years, this is all like a foreign language to me
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Old 4th April 2005, 14:28   #4  |  Link
twist3d
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i proposed a while ago "recommended x264 settings" sticky but maybe it just got overlooked. would help though.
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Old 4th April 2005, 14:28   #5  |  Link
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Quote:
Originally posted by Zarxrax
Speaking of the settings, has anyone written down what they all do anywhere? I've tried searching for anything that explains all the settings, but I'm not coming up with anything. After encoding with nothing but xvid for the past many years, this is all like a foreign language to me
I feel we should have the standards... but 150CHF is alotsa money
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Old 4th April 2005, 18:40   #6  |  Link
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get it from ITU for free -> look what akupenguin said in his post near the bottom of this page. On the page after that one, someone also points to a direct PDF download (maybe tha's an older version tho).

But ..good luck in trying to derive encoding settings from the specs.. :/
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Old 4th April 2005, 22:08   #7  |  Link
Stacey Melissa
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@twist3d - see the mencoder commands page. Near the bottom it has a -x264encopts section, which lists and describes x264-specific encoding options.
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Old 5th April 2005, 05:54   #8  |  Link
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@Stacey, those are for mplayer (i use the vfw builds) and still a complete hebrew for me (and there is no general recommended settings as I stated earlier). well off to test the latest xvid beta ->
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Old 5th April 2005, 06:07   #9  |  Link
Stacey Melissa
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Yes, those are for mencoder, but they are exactly the same options that the vfw interface uses. Most of them even have the same names. And if you read the option descriptions, the manual tells you what the "sane" ranges are.

There's no general recommended settings because the codec can be used for all sorts of different tasks, and each task calls for different settings. I do non-scaled anamorphic high bitrate DVD rips. My defaults are going to be different from someone who does downscaled square-pixel DVD rips at lower bitrates, or someone who does TV capture transcoding. So just use the default settings as a starting point, then tweak and experiment to find what you like best.

Last edited by Stacey Melissa; 5th April 2005 at 06:18.
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Old 5th April 2005, 06:39   #10  |  Link
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Re: Need Advice On X264 Settings !

Quote:
Originally posted by Amdh
I have lately Started Using X264 In Order to Compress Slow Motion TV Show Of About 30 Minutes ! However I am still confused and I need advice about the perfect Profile For Such Compression !
Can't tell you want the perfect profile would be, but I'd suggest you start by playing around with number of b frames, deblocking strength, enable/disable 4x4mv, enable/disable weighted b frames, enable/disable chroma motion estimation, and of course tweak the bitrate.
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Old 7th April 2005, 10:10   #11  |  Link
Amdh
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Thank U EveryOne ! I will Stick To The Default Settings !
By The Way I Was Using The following Profile :
Quantizer=23 and Sometimes 25
Deblocking=1 and Sometimes 2
Max IDR Frame=300
Min IDR Frame=5
I got A bitrate of about 70 to 95 kbps !
Is This Right !
Note : Video Resolution = 384*320
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Old 8th April 2005, 03:37   #12  |  Link
Stacey Melissa
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Your min IDR setting seems ridiculously low. Other than that, there's nothing wrong with your settings. If the quality and bitrate are good enough for you, then leave everything else alone. If not, start tweaking. That's how you can know whether you've got the right settings.
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Old 8th April 2005, 06:51   #13  |  Link
Selur
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"has anyone written down what they all do anywhere?"
I wrote something like that for the vfw x264 GUI in German, German speaking readers can grab it over here.
(it's named 'Wissenswertes rund um x264')

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Old 8th April 2005, 09:08   #14  |  Link
stephanV
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Quote:
Originally posted by Amdh

Thank U EveryOne ! I will Stick To The Default Settings !
By The Way I Was Using The following Profile :
Quantizer=23 and Sometimes 25
Deblocking=1 and Sometimes 2
Max IDR Frame=300
Min IDR Frame=5
I got A bitrate of about 70 to 95 kbps !
Is This Right !
Note : Video Resolution = 384*320
q = 23 and q = 25 in AVC roughly correspond with q=3.5 and q=4.5 in ASP, so your bitrates seems indeed very low for that sort of resolution (what kind of res is that anyway?)
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Old 12th April 2005, 14:25   #15  |  Link
Amdh
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Thank U Stacey Melissa For Ur Comment .. I Will Correct That .. Maybe I Will Set It To 25 .. By The Way What does it Mean in reality !

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Old 12th April 2005, 14:28   #16  |  Link
Amdh
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Dear stephanV
The Bitrate Seems Low however I got Good Quality Coz I'm Compressing Slow motion TV Shows !
About The Resolution It Seems Sufficiant For My Purposes !
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Old 12th April 2005, 18:31   #17  |  Link
Stacey Melissa
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Quote:
Originally posted by Amdh
Maybe I Will Set It To 25 .. By The Way What does it Mean in reality !
IDR frames are the only kind of seekable frames in x264. So if you like to skip around your video a lot, it would be good to have fairly low IDR values. The max IDR value is the more important one for that, though. The CLI interface for x264 defaults to Min IDR=25 and Max IDR=250. Mencoder defaults to 100 and 250, respectively.
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