Optical flow rendering crashes FCPX

I recently put 8GB of new ram and a 480 GB SSD in my 2008 macbook pro and cloned FCPX and all of my other software off of my 2013 iMac. When rendering optical flow on the Macbook, FCPX crashes when the render gets to 24%, every time. Canceling the analysis is the only way to press on, but the clip remains un-rendered. I never had this problem on the iMac so i'm not sure what to make of it. Has anyone had any luck making it work or working around?

Hello,
I got exactly the same problem, do not know if it crashes at 24%, but overtime when I am using optical flow,
I have tried with different footage, different resolutions and and and, its every time the same,
when I try with the same media on a macbook pro from 2015 it works,
mine is a mid 2009 with yosmite.
I have talked for hours with the FCP support from germany and once more for hours with the support in us,
there was no solution. I think it is a strange hardware problem.
Do you have fixed your problems?
If yes how?
Regards
Ulrich

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Optical flow rendering clip, computer logged out, missing files

I was creating a video, where some of the clips were on the iMac harddrive and some of them were on an external SeaGate harddrive. I was waiting for an optical flow rendering of one of the clips and walked away from the computer. Unfortunately, the computer screen saver came on and logged me out. When I logged back in, and opened Final Cut, the only clips showing available in the library are those on the iMac. The SeaGate files briefly appear in the event library only while final cut is loading, but once it completely loads it disappears (and can't be accessed), and all of the clips from there are showing as red "missing file." Therefore, my video is not there. Any suggestions on how to get back to where I was before the computer logged out? Or why the SeaGate is not available anymore?

this is what shows in the event library as fcp is loading.
once loaded it changes to this:
Here is the finder showing the seagate drive and one of the clips I used:
i ran disk utility, verify disk, both drives are working properly... all green.

No optical flow going from FCPX to Compressor

Using Compressor 4.1.3 and FCPX 10.1.4. When I export a project from FCPX to Compressor, and the project has some clips with Optical Flow, Compressor does not render those clips using Optical Flow. Using "Apple Devices HD (Best Quality)" setting.
I searched for similar questions, both here and in the FCPX forum, and didn't find any similar questions, which leads me to believe that either I don't know how to search properly, or I must be missing something obvious.
Any help is appreciated. Thanks.

Your experience matches what others have reported. Alternatively you could export a master file and bring that into Compressor to apply your settings. In other words, skip the Send to Compressor workflow altogether. Or export directly with ATV settings from FCP X
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Optical Flow and setting Offset make Not an Image

Hi all,
What I'm trying to accomplish is taking only a few hundred rows from a camera sensor to improve frame rate and moving the offset around based on movement in the image.
I am utilizing configure grab and grab in a loop to improve refresh rate.
I set up a test where the offset in Y was just incremented each loop and displayed the image. This is no problem. I have the incrementor as a remainder output and it will loop all day without error, and the image 'scrolls' across the available sensor space.
When I use optical flow (or point LK algorithm), with no incrementation, and just moving the camera around, optical flow has no problem. It will run all day. Also, the output is correct when I take care to set up the algorthim.
However, when I put the incrementation of the offset and the optical flow together, there is a problem. I expect the optical flow to return a vector similar to my incrementation. Instead, the program exits with a 'Not an Image' in the input of the optical flow block. Indeed, if I put a probe down the image does not appear.
The weird thing is this: for some increments it runs no problem. If I increment 10 rows at a time, no problem. If 8 or 9 or 1 for example, it crashes with 'Not An Image'. If I feedback the output of the optical flow vector into the offset change, the program will run until the distance of the vector in one of the X or Y directions happens to be one of these 'unhappy' numbers.
I also don't understand why 'Grab.vi' is returning an empty image when connected to optical flow, but with an image output without optical flow the image is never empty.

Hi,
Please share your code if possible. This would be helpful to better understand your code flow and make recommendations accordingly.
Also for your reference, here is also a link to a forum regarding optical flow:
http://forums.ni.com/t5/Machine-Vision/Displaying-Optical-Flow-from-AVI-file/m-p/2738890
Luis S
Application Engineer
National Instruments

Check settings combinations to achieve good Optical Flow HDV 50i -ProRes422

Hi Guys
RE: Motion 3, HDV 50i, standard ProRes 422, optical flow
I'm trying to decide which combination of settings I should choose in order to ensure the highest possible standard of optical flow-treated video for a video clip which just features live people - no graphics.
So far my results haven't been as 'smooth' as I would have liked. Below I have detailed my steps taken - if you could recommend which combination of 'lighting', 'field rendering', 'motion blur' or 'frame blending' I should choose I'd appreciate it.
1. I captured my Canon XHA1 HDV 50i video via HDV - standard Prores 422
2. I edited in FCP6 with standard Prores 422
3. I sent a video clip to Motion 3, new project and chose Broadcast HD 1920 x 1080 25 fps field order Top (Upper First)
4. I treated the video clip with optical flow to slow it down.
5. Export as standard Apple ProRes 422 movie.
Prior to exporting which of 'lighting', 'field rendering', 'motion blur' or 'frame blending' would anyone recommend please?
For reference, in this forum David Bogie kindly stated the difference between the choices. I have included his post below. However I just want to be sure I'm making the correct choices, as I'm a bit confused about the '50i' (interlaced) aspect of my video footage.
Here is David's post:
"lighting
field rendering
motion blur
frame blending"
These are options you need to use when you know why you want to use them.
If you have lights on in your scene, you want to render them. If you have no lights (and no camera) you do not need to activate lights. why does the switch exist at all? I render without lights for preview purposes.
Fields are necessary for interlaced formats. You must know if your production format is progressive or interlaced.
Motion blur enhances the illusion of movement by simulating image smear caused by an open shutter. You get the illusion at the expense of rendering time.
Frame blending is only necessary if you have video clips in your scene and even then you don't need it unless you've changed the speed of the clip. Sort of. "
Zak Peric also kindly posted, although I think his post relates more to graphics as opposed to interlaced video footage. Nonethless, here is his post:
"Just use animation codec + alpha if you have alpha channel if not use animation codec millions of colours. This is the best codec for best quality. Also 4444 is a very good codec to use as it supports alpha channel but gives you smaller file sizes. Use always BEST from the render window, if you want additional motion blur then switch it on in render view. Be advised it takes much longer to render with motion blur on."
Any tips would be really appreciated.
Warm regards
Peter

Hi Mark
Thanks for your kind prompt feedback.
"You say you sent a clip to Motion, but then you say you chose project settings - I don't understand this. If you really "sent' a clip to Motion using Final Cut Pro's "Send to Motion" command, you don't need to set project settings - Motion automatically creates a project with settings that match the FCP sequence. "
Okay I understand - sorry for any confusion caused - I had already used "Send to Motion" and applied Optical Flow to a clip which I then exported from Motion 3 as a Quicktime file. I was planning to repeat this process afresh, but am interested in which settings you could recommend from 'field rendering', 'motion blur' etc that might be applicable to my Optical Flow-analysed footage prior to exporting it as a Quicktime file.
As regards exporting my Motion work as a separate Quicktime file, I prefer to do this so as to avoid the waiting for it to render in FCP.
The already-optical-flow-analysed footage is actually pretty good (the original clips from FCP6 have already been stripped down to short durations to suit Optical Flow), but want to to double-check which of the 'field rendering', 'motion blur' etc combinations I should ideally choose to obtain best results, just in case I'm neglecting something that could otherwise make the quality even better?
Once I finish this video project I'm on I'll definitely be going for a clean install of SL and FCS3.
So, based on these choices...
lighting
field rendering
motion blur
frame blending
...I'm thinking that for my optical flow-treated video I won't need lighting, as it's mostly applicable to graphics.
I don't have any graphics in these optical-flow video clips. It's just moving video footage of people.
Am not sure about whether to choose Field Rendering (interlaced PAL 50i HDV - ProRes422 video).
Am not sure whether to choose Motion Blur.
Am not sure whether to choose Frame Blending.
Any tips would be really appreciated, and thanks again for your valuable feedback.
Peter

Can't get Optical Flow to render

I've read a couple of posts about other people having this problem, but they don't seem to apply as I can't find a workaround. I'm running FC 10.0.8.
If I render my timeline (about 15 minutes), the entire timeline renders, except for about five seconds that are in slow motion. The orange bar remains above that section even after the entire timeline is rendered.
After reading the other posts, I know the following might be relevant: I'm editing optimized AVCHD footage. There is no speed ramp. It's just a clip at slowed to 50%. The clip is completely separate (it's not just a selected range--in another post, somebody said just selecting a range was their problem).
I also tried creating a new project, bringing in a short clip (and nothing else), slowing it to 25%, and rendering all. The percentage display counted up to 100% like the clip was being rendered, but, at the end, the timeline still showed orange above the retimed clip.
I should say that I don't know if the clips are actually rendered properly in Optical Flow. I'm not sure I'd be able to tell the difference. All I know is that the timeline is still showing orange above them, so I'm presuming they aren't.

Russ--
Funny thing. I decided to test this by taking the same very brief clip and putting it into a timeline three times in a row. Then I made each slow motion 25%. Then I left the first normal, made the second frame blending, and the third optical flow. Then I exported the master file.
I guess I can see a difference, but the optical flow section actually looks kind of blurry to me.
Then I went back to the timeline and chose Modify> Render All. And FCX rendered the entire timeline, with no orange above any portion (not even the Optical Flow portion).
So I don't know what to think now. I don't know what the problem was, or if optical flow is any better than normal or frame blending. Maybe I need to try it with some different footage?

Optical flow retime not working

i am using a backup library and event for a project and now the projects retimes with optical flow with 24p photage are really stuttery, they where not this way in the original project ... any idea why? Ive tried different thinks but i am still getting the same results.

This problem has also crippled my normal workflow for the past few months, but thankfully I think it's been fixed. I ran the latest OSX software update 3 or 4 days ago (I think it's at 10.8.2 now), but was relulcant to check if optical flow was fixed because the notes about the update mentioned nothing about it. Yesterday, however, I dared to try using Optical flow on a clip just to humour myself, but it worked! Try running Software Update and see if that works for you.
I'm still a little upset though that thoughout the past few months where FCPX users on Mountain Lion complained about this problem, Apple never said a word about acknowledging the issue, that a fix was on the way, or announced that the issue was fixed. I for one sent about 5 feedback bug reports every 2 weeks about the problem and never received a single response.

Rendering in FCPX

Hello-
My question is: When using the "Retime Menu" and you select "Video Quality", lets say, "Optical Flow", do you need to render this before exporting the video? I have background rendering turned off, I'm under the assumption that background rendering is only for my benefit on playback. Yet, for the Retime menu the video quality setting is being selected as an export setting from my information, that being the case, does it have to be rendered before export, as compared to transitions for example?
Thanks,
Robes

The OP:
> When using the "Retime Menu" and you select "Video Quality", lets say, "Optical Flow", do you need to render this before exporting the video? <
This solved my question by David Bogie Chq-1 on Jan 21, 2015 5:12 PM
Yes, any and all effects or timing changes must be completely rendered to the high quality codec you want to use before you try to export or share.
>> On Jan 22, 2015, at 5:06 PM, Vince Garcia (Ripple Training Support) <[email protected]> wrote:
> Hi Robert, Rendering is for high-quality playback and is not necessary for full-quality export. So, even if your Optical flow effect was not rendered for playback, it would be automatically during export. <<
The answer: Effects and stuff that create pixels where none were must, of course, be rendered. When it gets rendered is irrelevant, could be done earlier, but it will all be rendered upon export. I think that should be obvious.

Optical Flow - Work Flow for Project Tips?

Hello, I have a 45 second sequence in FC and all of the clips are in Slow motion.
I sent one clip to Motion to add the optical flow to get the super smooth slow motion. The clip looks 100 times more professional.
But I have several clips. How can I do them all at once while away from my computer?
Do I export the movie as self contained, then import into Motion or is there a better way with exporting.

Andy, so I finally got it rendered on a Dual Core. I did as you said and selected the clips I wanted to send to Motion. I analyzed and when it went back into FCP it was all one long clip instead of individual clips and between two different shots there was 10 frames or so of black throwing off my time line and timing to the beat. Does anyone know what step I may have skipped??
Also,
I'm trying to render this simple triple stacked text with a light ray keying from left to right in V1 via filters tab.
[IMG]http://i42.tinypic.com/33a9u2w.png[/IMG]
But my comp gives this message: "The effect"Light Rays" failed to render: Your hardware cannot render at the requested size and depth"
REALLY???
Just plane confused. Is it a preference thang?
Thanks.
Message was edited by: thedirtyduo

Optical Flow produces only a still frame

Weird bug; hoping there's a workaround...
When I choose a clip and select Video Quality >> Optical Flow, it analyzes it and renders a still frame for the duration of the clip. (The thumbnail indicates shows motion throughout the clip, but indeed it's just a single frame.)
Any help is much appreciated.

As far as I can tell, this may only occur when the clip is set to a reverse direction (-100% speed, for example).

Optical Flow glitch

I'm having a weird problem with optical flow retiming. I've got a bunch of h.264 videos that I'm editing in FCPX and have transcoded to optimised media (ProRes). I'm using optical flow to do ramped retiming - it looks mostly good but every now and again (about once a second) there's a video frame that looks out of sequence resulting in a very distracting jitter.
The h.264 files are 59.98fps and the project is set to 29.97fps.
I could export the video retimed then cut out the rogue frames to work around the problem but that sounds pretty tedious.
Has anyone else come across this problem and if so was there a solution?
Thanks in advance..

I'm having the same problem, although I'm using h264 footage unconverted.
It's like every few frames, a frame appears that takes a step back in the action - the resulting movement is very jittery. I haven't yet found a solution. I'm worried the optical flow in FCPX just doesn't handle some footage correctly. My footage is 10 ft behind a person jogging, both the camera and subject are moving forward.
Hopefully someone knows of a workaround.

Optical flow retiming - HDV, ProRes, or AIC?

Which format would yield the quickest result for optical flow retiming of footage shot in 1080i HDV? HDV, ProRes, or Apple Intermediate Codec?

not HDV .... use ProRes or AIC. For what its worth, AIC has the lower data-rate so may offer the best performance. Run a couple of quick tests on a 10" clip rendered out to each of the 2 formats and post back with your results

Optical Flow in Shake

Who might have some experience using Optical Flow in Shake? I am retiming a shot that is a pan of a brick wall. I am getting some major visual artifacts in my renders. The bricks tend to stick or blur at the edges of the frame. I am currently rendering out a shot with all the "best" settings.
My retime mode is "Adaptive"
Motion is "Best"
Deinterlace is set to "Fast"
AlwaysInterpret is "On"
BackwardFlow is "On"
Flow Smoothness is at "100"
Flow Precision is at "50"
After this one I am going to try turning off AlwaysInterpret and see what my results are. Does anyone have experience with other software? Does Twixtor do a decent job? How about Optical Flow in After Effects?
Any advice on mixing different settings? The Optical Flow algorithms seem to be unable to handle repeating patterns well.
Any advice is appreciated.
Eugene

Hi there,
I had the same problem and fixed it by changing the retimemode to Nearest.
Ziggx

Optical Flow & SmoothCam together?

I've applied the Smooth Cam filter to some clips in FCP and I'm sending these clips out of FCP to Motion to apply an Optical Flow speed change but when they come back I've lost my Smooth Cam filter on them and can't apply a new one since they come back from Motion as .motn project files.
Do I have to slow them in Motion and export them as a movie and bring that into FCP and then add the Smooth Cam filter again? Is there something I'm doing wrong?

the way I've heard it, optical flow is the same engine at use in both Motion's retiming and FCP's smoothing operations. Seems you'd only need one analysis pass to accomplish both tasks but I can't find anything on Apple's site that suggests that is so.
See page III-467 for how to export the rendered clips out of FCP. Once you have stabilized the shot, you can apply retiming to the newly created media file but it doesn't look like you can do both without rendering at least one first.
Hope you hear from a Motion wonk soon.
bogiesan

Optical Flow Retiming Question

I have a quesdtion about retiming clips in FCPx. I have a mov imported from my DSLR (H264). I reverse and slow down the clip. All is good so far. But when I switch the retiming to Optical Flow, it only shows the first frame of the clip (the first frame of the imported clip, even if that section is not in the storyline). Optical Flow does work if the clip isn't reversed. Does Optical flow only work on clips going forward? I can always render an intermediate clip, but hoped it could be done within a single project.

To the bug report? No, I don't think you ever get replies to bug reports sent to Apple. You just have to wait for the next release and hope.

Optical flow rendering crashes FCPX

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