Roto rendering bug

[captainmpc]

last osx snapshot version

I'm working on videomapping project and I try to integrate Natron in my workflow. Here is my simple cropping script in aim to load five projectors with SVGA+ MJPEG videos outputs. Problem : when you render selected writers at same time, each result output file randomly flickers at the begin ( black frame blinking). It seems threads dont wait the processing branch before append frame in file.

Render each writers one by one works.

It is my bad ?

I try to enable "turbo mode", but render selected writers action ( dropdown menu ) do nothing at all in this case.

[captainmpc]

Hum this occured not only at the beginning, and images append but the pixel buffer is incomplete :

good frame ( black area is a roto mask )

some bad frames

this one is really bad ( blocks and lines missing )

[captainmpc]

Ok, after some test, roto seems to be the bad guy. Disable it at merge node -> outputs ok Crop it before merging -> outputs more stable ( 4/5 OK) I try to replace roto with some random process ( blur/add/color correction ) -> outputs OK

So, roto rasterisation is a little buggy ;) Question : when roto is rasterized and which node provides the final raster resolution to it ? Request : menu action for cancel all current renders

[MrKepzie]

This bug is similar to https://github.com/MrKepzie/Natron/issues/785 I'm closing.

[MrKepzie]

Re-opening as this is in fact a different issue

[MrKepzie]

I fail to reproduce this bug, can you send me the project? I do not necessarily need the input images, just replace it with a radial or constant

[captainmpc]

I do this now

[captainmpc]

can I send to you a wetransfert ? ( I package 100 frames with the natron project file ... maybe 5000x1420 image format cause this bug). email ? natron-contact ?

[MrKepzie]

You can email me at alexandre.gauthier-foichat@inria.fr

No need for all that frames, just 5 is enough

On 29 Jul 2015, at 23:23, Sebastien notifications@github.com wrote:

can I send to you a wetransfert ? ( I package 100 frames with the natron project file ... maybe 5000x1420 image format cause this bug). email ? natron-contact ?

— Reply to this email directly or view it on GitHub https://github.com/MrKepzie/Natron/issues/786#issuecomment-126099301.

[captainmpc]

Maybe this can help. Roto node seems having a bounding box optimisation under the hood , but it show it !! When you scrub the time line, node output looks good. But if you zoom in as render area is bigger than view and you scrub , missing block and other glitches start to come in the cache.

Putting a crop node after roto one improve that.... even disabled ...

[captainmpc]

With "Pyramid" file. 2 viewers in graph but just one connected ( anywhere ). The other is left alone. Clear all caches. Scrub timeline. No pb with roto mask.

Now connect second viewer ( anywhere ). Clear caches. Scrub. Problem with roto like with more than one writer in action.

I try this with second test file ( green rectangle with holes ). Opened like the screnshot state ( two independent branch ). Problem when scrubbing. Ok. Not connected on same stream but problem is always here. So I delete one viewer. Clear caches. Bug still here ??!!

Because I notify another bug, I decide to reload default layout....two viewers tab appear ... the last viewer deleted is still here in memory... I delete it again. Save, close, load, just one viewer -> scrub OK.

Hope this can help you to find this bug. Roto rasterization is losted with more than one output .

[MrKepzie]

I found the issue, now I have to come up with a solution and will update

[MrKepzie]

Please confirm that this fixes it correctly

[captainmpc]

yes , it works in this snapshot ! thanks But in this one Natron-snapshots-75c49eff01f780e1bc70a076af44e73235235cdc.dmg , roto is broken ( no output at all )