300mb Movies using Megui

[fahim]

I want to encode 300-400mb movies in megui somebody help??

[poisondeathray]

filesize = bitrate x running time

megui has a bitrate calculator

there are many guides if you search here and on google

if you have a specific question, then come back and ask

[MatLz]

Hi.
With low resolutions and low video/audio bitrates...
But it's depending on your sources...if it's action movies, animes, slow dramas... The way is not the same for all types.

[fahim]

I have encoded in mkv from hd source using RipBot264, the output video quality is good but after few seconds it loose its frames & quality becomes so bad??

[neuron2]

You encoded an HD movie to a 300MB file and you're complaining about quality?

[fahim]

My question is" after few seconds it loose its frames & quality becomes so bad"?

Why it works good in start?why it is not constant,that's my question??

[[P]ako]

It appears you are encoding at a constant bitrate.

Also, as Neuron2 had pointed out, 300 MB for an HD movie is way too small to hold any quality.

[fahim]

What mean by constant bitrate??

[MatLz]

Constant bitrate mean constant bitrate. Bitrate is constant all the video length.
But (and in 99% of cases it's right) some scenes requires more bitrate than others cause their complexity!
I think you have a problem with codec settings.
And...what codec are you used?? Are you keeping hd as Neuron2 asked?
Say 'it's bad' is not enough! We need more informations to help you.

[fahim]

I m encoding in latest x264 .mkv format in megui,HQ-Slow profile, if u ask i can upload a small sample of movie so u can check it.

[neuron2]

I m encoding in latest x264 .mkv format in megui,HQ-Slow profile, if u ask i can upload a small sample of movie so u can check it. You can upload a sample to mediafire.com and post the link here.

What do you want us to check in it?

[nakTT]

You encoded an HD movie to a 300MB file and you're complaining about quality?
Since the OP using MeGUI, any chance that he might experience the same issue like me?

http://forum.doom9.org/showthread.php?p=1325863#post1325863

Normally I will get good quality at 500kbps but ever since this issue surface, the quality has been dropped for obvious reason.


I have encoded in mkv from hd source using RipBot264, the output video quality is good but after few seconds it loose its frames & quality becomes so bad??
Tell tale of the same issue (or symptom that I'm facing, perhaps?). When the higher motion scene kicks in, the quality starts to deteriorate for obvious reason.

[fahim]

In Mediainfo my writing library for x264 is core 75,while i found other .mkv files on internet which have core 65 or 67 & have good quality with same bitrate as i have, why my writing core is different??

[nakTT]

In Mediainfo my writing library for x264 is core 75,while i found other .mkv files on internet which have core 65 or 67 & have good quality with same bitrate as i have, why my writing core is different??
May I know what MediaInfo report about your bitrate? Is it "variable" or "Nominal Bitrate"? I'm not an expert, just asking as a newbie here.

:thanks:

[Inspector.Gadget]

nakTT, are you sure that isn't just a change in MediaInfo labeling? "Nominal bit rate" in the MPEG-PS context from that program refers to the bitrate as claimed on muxing/authoring, even though it's not the actual bitrate (which is variable).

[fahim]

Where is this option to check "variable" or "Nominal" Bitrate?? what's the difference b/w them?

[MatLz]

Fahim, please post the mediainfo text file of your 'bad' encode.

[fahim]

Check it, & tell me about problems.
thanks

[nakTT]

nakTT, are you sure that isn't just a change in MediaInfo labeling? "Nominal bit rate" in the MPEG-PS context from that program refers to the bitrate as claimed on muxing/authoring, even though it's not the actual bitrate (which is variable).
Thanks for the reply,
I'm 100% sure because the same version of MediaInfo read a file encoded at 500kbps using latest MeGUI (0.3.1.1056) as:

Nominal bit rate: 500Kbps

While a file encoded with (immediate) previous version (0.3.1.1055 if not mistaken) read by MediaInfo as:


Bit rate mode: Variable
Bit rate: 500Kbps
Maximum bit rate: 2837Kbps


Please refer to this posting for screenshot:

http://forum.doom9.org/showthread.php?p=1325863#post1325863

Perhaps Original Poster (fahim) can share something here. I Just think that he might experience the same issue that I had. Because the tell tale is about the same. But I may be wrong.

:thanks:

[fahim]

I don't understand the difference b/w Nominal & Variable?
Explain plz.

[nakTT]

I don't understand the difference b/w Nominal & Variable?
Explain plz.
Perhaps you can have a look at this post:

http://forum.doom9.org/showthread.php?p=1325863#post1325863

and tell us which info (1st or 2nd screenshot?) appear as part of your MediaInfo report. If it is not "Variable", perhaps you suffer the same issue as me.

:thanks:

[MatLz]

Well...
conversion of fps to 23.976 will help you a lot I think.
me and subme to higher values.
Refs frames to 5 with mixref.
Trellis to 1 or 2.

What is your audio bitrate?

[fahim]

Well,except fps, where i found other these options in Megui?

[MatLz]

In the config encoder settings.
In 'frame type' you can change the number of ref frames.
In 'analysis'
Change me algorithm to umh or higher, change subpixel refinement to 7, choose trellis to 1or 2 and choose mixed reference frames.

I ask again, what is your audio bitrate?

[fahim]

Oh,128 , but i have only problems in video, will check out ur options.
thanks.

[MatLz]

Convert fps to 23.976 will give you a real quality gain. With a low 'total' bitrate audio eats more size in term of proportionnality. So decrease audio bitrate to increase video bitrate, in that case is really helpful.
Someone can explain that in a better english than mine? :(

[fahim]

Ur english is o.k,no problem, i m understanding.
Where i set those settings,

cabac=1 / ref=8 / deblock=1:-2:-1 / analyse=0x3:0x113 / me=umh / subme=6 / psy_rd=1.0:0.0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=3 / nr=0 / decimate=1 / mbaff=0 / bframes=16 / b_pyramid=1 / b_adapt=1 / b_bias=0 / direct=3 / wpredb=1 / keyint=250 / keyint_min=25 / scenecut=40 / rc=2pass / bitrate=576 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:1.00

They r from ripped movie in mkv, video bitrate 576,quality is verygood.

[Inspector.Gadget]

Convert fps to 23.976 will give you a real quality gain.

Only if your source is actually FILM and you need to IVTC. Otherwise you're going to make a mess of the motion.

[MatLz]

Only if your source is actually FILM and you need to IVTC. Otherwise you're going to make a mess of the motion.

Forgive me, I'm a newbie! ;)

@Fahim, before to be happy for quality, it's better to encode the entire movie.
I don't understand your new post, do you want change your settings to match with these or else?

[fahim]

to match with these.

[MatLz]

Hm...it seems just like I said you, except 8 frames refs, bpyramid enabled and mbtree disabled.
So just change these in the codec settings.

[fahim]

What's mean by mbtree disabled?

[MatLz]

What's mean by mbtree disabled?

Well well...I have say that because mbtree and rclookhead are not in the info text...it's strange because even disabled, it must be appear as mbtree=0.
This encode has been done with old X264 version?

[MatLz]

I'm totaly lost with you...
To resume, it's possible to make 300mo movies with X264 (to be not out of topic : with MeGUI...) using high codec settings (high values of me, subme, refs, usage of mbtree and other optimizations...) not really at speed cost cause the LOW-RES.

[Inspector.Gadget]

Well, you don't NEED to use more complex x264 settings, but it'll certainly help with quality. Encoding is a four-way trade off between visual quality, file size (bitrate), complexity, and time spent. 300 MB is tiny for any non-anime feature-length movie at DVD resolution, even using the slowest possible settings in x264.

What's your source? How are you going to play back the clip you encode?

[fahim]

Source is hd & i just want to play it 17" LCD not big one,just tell how i encode in x264 core 65 or 67,while megui encode in core 75??

[Inspector.Gadget]

"Source is HD" doesn't tell us anything. Blu-ray? AVCHD cam? What's connected to the LCD to play back the encoded file? Why a 300MB limit?

[fahim]

HD movies, 300 mb bcz i have less hard disk.

[Inspector.Gadget]

Clarify "HD movies". And if you have a small hard drive, why not plan to encode to a file large enough to be reasonable quality and then delete after watching?

[fahim]

Movies Downloaded in 720p from internet having higher bitrate.