Sunset Lake Software - General discussion

Custom CVPixelBufferRef

michel.lonngren — Sat, 13 Jul 2013 02:39:53 +0000

I have a custom pipeline where I have an allocated CVPixelBufferRef that I render to. I would like to plug in GPUImage into my pipeline but I am trying to figure out if you can provide the destination pixel buffer that GPUImage writes to?

If that is possible (or possible with a small modification) is it possible to render kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange or does GPUImage currently only work for kCVPixelFormatType_32RGBA as pixel format?

Record video with other UIview

neorichi — Thu, 03 Jan 2013 08:54:45 +0000

You can overlay a view over the video and have UIelements that view and recorder?

Thanks you

How can I modify the bulge effect to only be a half circle?

mclejar — Wed, 28 Nov 2012 14:21:56 +0000

Hello,

I would like to use the bulge effect but only half of it. For example I would like to bulge just the right side of the area getting the bulge effect but leave the left side normal without the bulge (as if a line was drawn down the center of the effect and the effect was only applied to one side). How could I modify the code to do this?

Thanks!

Record video with data overlay information

neorichi — Mon, 26 Nov 2012 08:56:07 +0000

Good afternoon,
First of all I thank you for your fabulous framework.
Need your help and I need a working example for ios6 where you can record video with data being captured while recording.
Eg record the acceleration data captured while recording the video, it would be possible?

I sincerely hope that you can help me on this issue and I'm doing a project for my project for my thesis and I need a working example.

Thanks and kind regards.

Best Way to trigger movie from tracked color?

Sat, 24 Nov 2012 21:02:34 +0000

I'm trying to figure out what the "best" way to trigger a movie file to play when a centroid object (e.g.., like in the color tracking example), is on a certain spot x/y.

It seems as though, if two images are being composited with a blend shader, that when a movie "runs" out, that the image output freezes. There also doesn't seem to be an explicit "play" method in gpuimagemovie.

GPUImageMovieWriter and avfiletypempeg4 filetype

DeepThought — Wed, 21 Nov 2012 09:53:29 +0000

HI,

First of all I would like congratulate you Brad for the amazing work.

I'm trying to apply a rotation to a given video file and obtain an mpeg4 (AVFileTypeMPEG4) file as output.

When doing this I obtain the following message :

*** -[AVAssetWriterInput appendSampleBuffer:] Input buffer must be in an uncompressed format when outputSettings is not nil

This problem occurs when using the following init method of GPUImageMovieWriter with filetype set to AVFileTypeMPEG4 :

Encoding movies that are supported for android

nikita — Sun, 11 Nov 2012 20:45:24 +0000

Which settings and parameters do I need to define to make encoded movies suitable for playing from stream on android devices?

Concurrent programming

nuthinking — Wed, 31 Oct 2012 20:44:06 +0000

Hi guys (Brad :)), I have been trying to generate a filtered image on a different thread using the iOS 6 way (NSOperationQueue), I am getting always at some point the error: "Error at CVOpenGLESTextureCacheCreateTextureFromImage -6683".
Is this because GPUImage has already its own thread management (see runSynchronouslyOnVideoProcessingQueue)?

Is there a way to apply filters to images on a different thread?

Thanks!

Imagefilter like sketch, emboss and RGB...

hkerman — Sat, 20 Oct 2012 10:49:04 +0000

Hi Brad,

I realy love your GPUImage-Framework. I need some help with some Filters like sketch, RGB, Emboss...
If I try to manipulate an Image within these kind of filters, the alphachannel is got to be lost. My Images always having a transparent pixelzone. What can I do to keep it ? Can you implement a feature like this or do you have a tricky Idea for me for doing this by myself ? This would be realy great.

Best Regards
Hans

GPUImageKuwaharaFilter blocking the main thread?

mabene — Wed, 10 Oct 2012 20:04:34 +0000

Hi there,

I have a question about the GPUImageKuwaharaFilter filter.
The documentation says that it is "extremely computationally expensive [...] it can take seconds to render a frame".
I'm fine with this, so long as I can offload that heavy computation to a background thread and keep the UI responsive as the filter processes its inputs.