#113 Video encode Preview

[BlackShark]

Video encode Preview :
Avisynth preview is great i can tell my filters are correctly set up but the most important part is still missing : the actual encoding itself : i want to see what my video will look like after the compression.
So i would like Megui to let me choose a very short clip of my video, to encode it, and to show it to me frame by frame so that i can preview it and than compare it to my source and an other preview.

Alright so i know you are already thinking "it's irrelevant, the full film encode would be too different from the preview" or "but you can already do it, just do this and than and...."
Well, the goal of a preview shot is to help me guess what the encode would look like with the settings i am using : is this bitrate sufficient ? what would quantiser 21 look like ? or would crf 20 look better ? what is the best deblocking parameters ? How much of the grain am i going to loose if i use treillis ?

These questions can only be answered by previews, and right now, a preview must be made by hand.
This means switching to Virtualdub, cut a clip in direct stream copy or lossless mode, render to temporary file, back to Megui, re-import the file, getting all the settings back like i wanted, and render.
This represents a tremendoulsy high nimber of operations that have to be done by hand with a very small amount of time dedicated to the encoding itself.
Once the fiste preview is done, changing just one parameter is quicker, but what if you want to test an other clip, you would have to retart all over again, which means more manual opérations and loss of time.

Having a preview feature inside Megui would help getting a very precise idea of what the video would look like and would save me a tremendous amount of time.
I believe this would work quite well for quantiser, quality, and 1pass abr modes.
Getting it to work with 2pass abr would be harder, but you could just use 1pass abr and display a warning message. Or add a button to queue a superfast analyse pass in the background with all maximum speed options activated, and the statsfile would be used by the preview system to simulate the bitrate distribution (and which could also be used for a 3-pass final encode instead of 2pass).

I know it would take some time to compute the stats file for the 2-pass preview even with maximum speed options but for all single pass modes, it would be far easier and much much quicker than doing it by hand.
Even better, i do not know if this is possible but imagine if you just could display the images as soon as the groups of pictures are done, you could get the preview within seconds ! (or maybe you'd have to modify x264 to do that) but that would be the ultimate feature.

Thanks for having read my very lengthy and maybe a bit silly requests.

[wallace]

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I second this request :)

[Zathor]

I am sorry, this feature will not be implemented