Re: FxPlug Filter - Play to Analyze

Subject: Re: FxPlug Filter - Play to Analyze
From: Andrew Santa Maria <email@hidden>
Date: Mon, 20 Jun 2016 16:20:53 -0700

Hi Peter,

Thanks for the suggestion. I'm actually trying to implement the showing of a progress window when the frames get analyzed. It functions perfectly in Motion, but using the plugin in Final Cut Pro X is where I'm facing issues. In Final Cut Pro X, the window intermittently displays after the analysis is complete (I run the analysis function in renderOutput), and I got that far into making it "work" in FCPX by finding out that I had to surround my GUI-altering code with dispatch_async(dispatch_get_main_queue(), ^{ ... }). Have you run into any issues getting your dialog box to consistently show up before the analysis?

Thanks,

Andrew

On Tue, Jun 7, 2016 at 4:39 PM, Peter Litwinowicz <email@hidden> wrote:

You could do what we do for one of our plugins:
have a button (we label it "Start Analysis"). All params are disabled until the analysis is done, so that's the only thing the user can do upon application.
When the user clicks "Start Analysis" we put up a dialog box with progress bar that shows the analysis progress as we read and process every frame.
This gives the user the experience that something is happening (instead of just waiting for renderOutput to return). Of course it has the added "bad" UX that you basically block FCP or Motion from doing anything while you are doing this.

It's a trade off, yes.
Pete

From: <pro-apps-dev-bounces+pete=email@hidden> on behalf of Andrew Santa Maria <email@hidden>
Date: Tuesday, June 7, 2016 at 4:12 PM
To: <email@hidden>
Subject: FxPlug Filter - Play to Analyze

Hi all,

The FxFilter that I'm developing requires data from a range of frames in a video. Analyzing a whole range of frames at once takes too long and makes Motion/FCPX temporarily unresponsive (I originally accomplished this all in renderOutput), so I decided to have the user simply start at the beginning of the video and press play (hit spacebar) to sequentially process the frames. This way, the user has an idea of the progress that the FxFilter is making, and Motion is still relatively responsive.

I click a toggle to enable "frame analysis mode" then press play. The first few frames play slowly reflecting that the processing actually happens, but then the playback speeds up, and frames skip as shown in the debug log below: (I have an NSLog( @"Processing frame %f", renderInfo.time.frame ) in renderOutput)

2016-06-07 16:06:15.808 Motion[15401:5271444] Processing frame 0.000000
2016-06-07 16:06:15.813 Motion[15401:5271445] Processing frame 1.000000
2016-06-07 16:06:16.040 Motion[15401:5271444] Processing frame 2.000000
2016-06-07 16:06:16.231 Motion[15401:5271445] Processing frame 13.000000
2016-06-07 16:06:16.529 Motion[15401:5271444] Processing frame 25.000000
2016-06-07 16:06:16.553 Motion[15401:5271445] Processing frame 43.000000
2016-06-07 16:06:16.558 Motion[15401:5271444] Processing frame 44.000000
2016-06-07 16:06:16.576 Motion[15401:5271444] Processing frame 45.000000
2016-06-07 16:06:16.579 Motion[15401:5271445] Processing frame 46.000000
2016-06-07 16:06:16.590 Motion[15401:5271445] Processing frame 48.000000
2016-06-07 16:06:16.592 Motion[15401:5271444] Processing frame 47.000000
2016-06-07 16:06:16.613 Motion[15401:5271444] Processing frame 49.000000
2016-06-07 16:06:16.616 Motion[15401:5271445] Processing frame 50.000000
2016-06-07 16:06:16.632 Motion[15401:5271444] Processing frame 51.000000
2016-06-07 16:06:16.649 Motion[15401:5271444] Processing frame 52.000000

Is there a way to ensure renderOutput runs on every frame during playback?

Thanks,

Andrew Santa Maria
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References:
	>FxPlug Filter - Play to Analyze (From: Andrew Santa Maria <email@hidden>)
	>Re: FxPlug Filter - Play to Analyze (From: Peter Litwinowicz <email@hidden>)

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