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Windows 7: Encoding Speed

30 Jun 2011   #11

Windows 7 Home Premium x64

You should remember that slower is actually better sometimes. The more time an encoder has to analyze every frame in the first pass, the better quality output may be presented at the end, because the encoder would be a lot more efficient.

Deinterlacing sometimes requires a lot "power" from the encoder, this could be the main cause of the "problem" you're facing. Also, anything and everything you actually do on your PC while the encoder does its magic also affects the FPS speed at which it runs: antivirus software, system and other services, apps, gadgets etc. Because encoders rely on the power of the CPU to do their job, chances that two "similar" video clips encode at the same FPS is, at least to my knowledge, extremely small, because not only two similar clips but also multiple scenes within one video clip may vary enough to require certain changes in the encoder behavior. The more you actually use your PC while encoding, the slower the encoder will be; which, again, may not be a bad thing for complicated jobs including, as mentioned, deinterlacing, but also deblocking, hardsubbing (especially if the video clip is very long; 2+ hours) and a lot more (depending on your encoder settings), but isn't efficient with fairly simple encodes, that much I agree.

So, to conclude my weird and complicated answer: probably not. There are too many variables an encoder needs to determine how to process, while also depending on your settings and CPU power available ATM; despite the fact that two movies, as you said, "similar on the surface" should produce the same encoding speed i.e. FPS (it is, actually, practically the same thing).

For some reason I got the feeling that you may be looking at this FPS thing the same way FPS is considered in video games; these are two entirely different concepts, so you shouldn't really worry if an encoder runs at a lower FPS than what you expected. If not, I apologize in advance. Hope this cleared some concerns for you.

My System SpecsSystem Spec
30 Jun 2011   #12

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE

While I did say that encoding and FPS were not equal to each other, I'm not sure now exactly what I meant, because they do seem to be opposite sides of the same coin. Therefore, if a fast encode produces the same quality as a slower one, I will choose the program that is faster. But this was not about the speed of one program versus another, or encoding methods, it was about the speed of encoding when all things appear equal on the same program, with the same settings, on the same hardware, just different movies. I do believe that there must be a difference that I'm not seeing, when there is a noticeable difference in speeds under this conditions, but that was what my question was about. I guess that it doesn't really matter, so long as the job get done, but my curiousity was itching and I wanted to scratch it.
My System SpecsSystem Spec
30 Jun 2011   #13

Windows 7 Home Premium 64bit

I agree with Gornot.
Theres just to many variables that come onto play when you see the FPS its encoding at.

In regards to De-Interlacing to video, there are different methods, depending on the video. So depending what method it uses, even if they are using the exact same settings otherwise, may show differnt results.

Also, you must keep in mind the other varying factors.
Are you downmixing to Stereo Audio? Are you using AAC, or AC3 audio? Keeping original Audio?
if recoding it, Downmixing AC3 5.1 to AAC 2.0 for example will take some time. Or Even DTS to AC3 5.1. Some conversions take longer than others.

One other thing I havent seen mentioned yet is, scene complexity.
A scene with a close up of actor talking, is much faster and easier to encode than say, a car chase through New York City.
Again, this goes back your settings. If you want the encoder to use an average of bitrate of say, 2000 ....

It must first anylyse the film. Then figure out where it can use lower bitrates, and where needs higher bitrates to average out to what you are asking of it.

This is really where the "lower is not always better" really comes into play the most, and I too agree.

Theres also the resizers. Soem are slower (but more accurate) than the Faster (less accurate) ones.

The only thing I slightly disagree about, is never changing the Frame rate.
For example, DVD is generally 30 FPS (or 29.97)

I find that by letting the encoder use a framerate of 23.976, its able to produce much better results. In fact, the x264 encoder (at least in MeGUI) is quite fond of doing this, and prefers it.
Its easier to throw away frames, and decide what to use as reference etc, than it is to add. It also allows for much better compression, without much loss in quality .. at least that the eye can see.

However, I agree that increasing framerate will do more harm than good. You can not really add, and get good results.
My System SpecsSystem Spec

30 Jun 2011   #14

Windows 7 Ultimate 64bit

could be the length of the cuts and scene changes in the films. More variance between frames will cause the FPS to drop due to more processing required.
My System SpecsSystem Spec
01 Jul 2011   #15

Windows 7 Home Premium x64

Guess I didn't just mention it, so thanks to Wishmaster; yes, when I meant change the frame rate, I meant increase the frame rate

Also, meister, buddy, you keep repeating "just different movies". This is everything BUT a small factor to encoding comparison, despite using same settings used over and over again.
A fast encode can never wield the same results as a slow encode (and in some cases, vice versa); again, taking into account what Zepher said, which is absolutely true. This is also why some movies can be compressed to a very small size, for example, as low as 350MB, and wield the same visual quality as a fast action movie which, depending on your preference, can only be compressed to an extent.

If you, for example, compare an encoding job of an episode from an Anime DVD, and a random Disney cartoon, which visually may look similar, anime episodes will require much less processing by the encoder because there are a lot less visuals in them, while "a random Disney cartoon" may encode as long as a fairly simple motion picture without action sequences, complicated/detailed special effects etc.

I guess what I'm trying to say is that there can never be two movies so similar that you can just use the same settings over and over again. It may work for one movie, but it certainly doesn't mean that it will work for the other, exactly because of all the variables we mentioned, even though you visually may not tell the difference between them.
My System SpecsSystem Spec
01 Jul 2011   #16

Windows 7 Home Premium 64bit

Quote   Quote: Originally Posted by Gornot View Post
because of all the variables we mentioned, even though you visually may not tell the difference between them.
We may not be able to tell any difference, but to the Encoder itself, it sees a night and day difference.
My System SpecsSystem Spec

 Encoding Speed

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