I Need Advices On X264 Configuration !

[Amdh]

Well ... Dear Doom9 Members , I Usually Use X264 In Order To Encode Small Slow Motion TV Shows Of About Half An HOur ! Please Can U Give Me Advices On The Advanced Settings Of X264 ... What Quantizer should I Use ??? What Is Scene Cut Threshold ??? Should I Use Chroma ME ??? ....
Note That I Would Like To Get a File Of At Most 105 Mo With Good Quality ! And I Encode At 352*288 !
Thank u In Advance !

[berrinam]

It seems to me that you have been constantly asking for help with x264 settings since you have joined this forum. Must you keep starting new threads, and would some background reading on this forum be appropriate?

If you want to get a specific filesize, why are you using quantizer mode? You should be using a bitrate mode if you want to hit a specific filesize.

Chroma ME improves motion estimation (ME) by using chroma (color) information. It is a good option to use in most situations.

Scene cut threshold determines "how aggressively to insert I-frames." The default values are often good.

[Amdh]

Thank U .. Forgive Me If I'm Allways Asking ... U Know I'm Just A Novice & I Do Not Understand Too Much In Video Encoding !

[Amdh]

Well .. I Do Not Use Constant Bitrate Mode Coz It Gives The Same Amount Of Bitrate For All The Scenes In The Video ... My Videos Have Some Fast Motion Scenes (The Titles Are In Fast Motion So When I Use Constant Bitrate They Look Bad Quality) !
Thank u Again

[Sharktooth]

Constant bitrate? x264 has AVERAGE bitrate since some time...
However, that's why 2 passes are better than 1 pass...

[Amdh]

Yes I Mean Average

[rlancelot_xjb]

Constant bitrate? x264 has AVERAGE bitrate since some time...
However, that's why 2 passes are better than 1 pass...
What is 2 passes?Could you give me some advice on it?Thanks,I am a freshman :confused:

[berrinam]

When the video is encoded, it is divided up into macroblocks (normally 16x16 or so pixels). The number of pixels used to encode these macroblocks varies with the amount of quality kept. As some macroblocks are harder to encode than others, for the same quality level, different numbers of bits are needed to encode them. The process of deciding how many bits each macroblock gets is called Rate Control. There are a few methods of rate control (an overly simplified version):

1. Constant bitrate. This means that every macroblock (in fact, it is normally every frame, but it can vary) is allocated the same number of bits. This means that some macroblocks will end up with much less quality than others.

2. Quality-based (aka Quantizer-based, QP) encoding. This means that every macroblock is given the same quality. As a result, the size of the macroblocks will vary, and filesizes can be unpredictable.

3. Two pass encoding. The aim is to keep the entire video at equal quality, while being able to hit a required filesize very accurately. Firstly, the encoder analyses the entire video to see how easy it is to compress. It then comes up with a quality level with which to encode the video which will hit the target filesize. It then encodes the movie with this quality level. So the analysis stage is the first pass, and the encoding stage is the second pass.

4. Multi (more than 2) pass encoding. This is the same as two pass encoding, except that extra stages of analysis give a better impression of how compressible the source is. This can be used if the encoder misses the target filesize. It may result in a better quality output, but by how much is debated.

5. Average bitrate. This has the same aims as two-pass, except it attempts to avoid the first (analysis) pass. It stores some of the video in its buffer while it analyses it and then comes up with a quality level for that section of video, which it encodes. This results in better quality than constant bitrate, better filesize predictability than constant quality and more speed than two-pass, but the quality can at times be noticably worse than two-pass.