[Koby Goldberg]

Hi Jim,

You should be able to do the calculation slightly simpler by using Math.atan2 instead of Math.asin, and thus you will not need the calculation of x (you won’t need the sqrt calculation). Simpler expressions could make your render faster, because expressions are being calculated every frame.

Try this, I think it should give you the same result as above:

a = thisComp.layer(“DRIVER_all_sides”).effect(“length – X”)(“Slider”)/2;
b = thisComp.layer(“DRIVER_all_sides”).effect(“HEIGHT_TRIANGLE”)(“Slider”);

Math.atan2(b,a)

If you still need to do the (90-p) conversion, then just swap a and b in the Math.atan2, i.e.: Math.atan2(a,b), but I think atan2(b,a) should give you the final angle you wanted.

Cheers,

Koby

[Koby Goldberg]

The above question and answer are rather old…
I wonder if latest versions of PPro support this feature…?

[Koby Goldberg]

Thanks Thomas!
I missed the generic background with the particles. I guess this background should be kept for the entire slideshow (and can change colors to be interesting)
I have to think about this a bit in order to stack the layers correctly with the track mattes, but it makes more sense to me now!

Thanks,
Koby

[Koby Goldberg]

Thank you very much guys !
I will check out the VideoReDo software you’ve mentioned.
I will also check the mentioned EDIUS if it can provide what I’m looking for. From what I’ve read, EDIUS uses MPEG2 natively and uses the powerfull PROCODER compressor for exporting, maybe it can change the GOP sizes and recompress only the needed parts. If it does, it would be more convinient for me than the VideoReDo because of the full NLE capabilities EDIUS can offer (Transitions, Effects etc.).

If you have any other ideas or software I could also try, I would love to hear!

Thank you all again,
Koby.

[Koby Goldberg]

Hi Lance, thank you!

When you say “Edius Procoder”
Do you mean EDIUS NLE software ?
https://desktop.grassvalley.com/products/EDIUS/index.php
(used to belong to Canopus, now: Grass Valley)

Or PROCODER format converter ?
https://desktop.thomsongrassvalley.com/products/ProCoderSW/index.php
(also used to belong to Canopus, and now Grass Valley)

[Koby Goldberg]

Thank you very much Brian!
It looks great! I’ll look into that!
What exactly does it do ?
Is it like a Video Editor for MPEG files, that combines and cuts parts of it without recompression ?

Tim,
What software did you mean ?
Something like Brian suggested ?

p.s.: From what you both are saying, I understand that PPRO cannot do those accurate editting and smart compression… I hope that for AVCHD compression they CAN do it, because it would be quite a shame for someone to import AVCHD footage from a camera and need to recompress the whole video again after minor editting… (HD is much much slower)

[Koby Goldberg]

Hi Tim,
Thank you very much for the explanation.

However from what I know the GOP size doesn’t have to be constant… it can change in the course of the DVD. This way commercial DVDs are made to achieve best quality: usualy each new scene (or camera cut) is starting a new GOP (with an I-frame).
Therefore in the example you gave, the first new 10 frames can create a GOP, the next 15 frames would be the second GOP (changed from the original because of the fade and would have to recompress), and the rest of the video could stay the same with it’s original GOPs.

Moreover, I know it is possible because with an old MainConcept version (in PPRO CS2) I did it! I am not dreaming… 🙂 I realy did it. The export ran very fast on footage that didn’t change, and slowed down to render and recompress parts of the video that were added or changed. The time was 10:1 than the original video (if the video was 10min, the export to MPEG2 took about 1min), and that was on an older computer, so it could not have been a compression…

Koby.

[Koby Goldberg]

Brian,
Thank you for the reply!

I know that for DV compression, PPRO has a feature for not recompressing (some checkmark on the export video options), isn’t there any hidden feature similarly for MPEG2… ?

I tried along time ago the MainConcept MPEG plugin for PPRO (for CS2 version), and it did just that: Upon export, it exported fast on any unchanged footage, and then would stop and actualy render slower on any changed/added footage. However the newer versions of MainConcept for CS3/CS4 doesn’t do that anymore… they recompress the whole video… That’s too shame they took out the best feature of their plugin!

I didn’t understand from what you wrote: Is there or is there not another software that can do it ?

Any other ideas … ?

Koby.

[Koby Goldberg]

Scott,
I don’t know if it is possible to tell PPRO not to pause each time you press CTRL+K… But I can offer another way for you to achieve what you want:
Play the sound and place Markers using the * on the numeric keypad while hearing it. The * does not pause the playback. After finishing the whole music, just jump between the Markers by holding the CTRL and pressing the right or left arrow key, and press CTRL+K to place a cut. Therefore you can hold the CTRL key down, and just press interchangebly: arrow, K, arrow, K, arrow, K … in order to place a cut and then jump to the next Marker.

Koby

[Koby Goldberg]

Hi Brian,
Thank you very much for your repoly !

I intend to replace several segments of few seconds each with different footage, and add some transitions. The whole video is about 1 hour, so most of it will stay the same.