I'm trying to perform the task of taking a picture, but triggered by code instead of relying on the touching of the camera button in UIImagePickerController. Can this be done? I want to take a 10 pictures, 1 per second.
As answered here, check out Apple's AVCam sample. It shows how to get both still images and video from the camera.
You should look into the AVFoundation framework -- that makes it pretty easy to do.
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my app use AVCapture for capture image, this is my supervisor's ideal. But i research in internet and a can't get any information about the difference between AVCapture and default camera of iPhone or iPop (tab focus or camera quality...). please tell me what advance of AVFoundation framework ...
with the AVCaptureSession you can give your recorder a lot more functionality. You can customize nearly every aspect of the recording session. and you can ever get the raw data straight from the camera. the code can get quite complex however, and nothing is taken care of for you.
With the iOS default image capture controller you will be stuck with a few presets, and you will only have a little bit of camera functionality. But it is really simple to implement.
updated with link to apple code
If you want to see how to use the AVFoundation to do you camera recording you will probably like this app from apple.
Like I said, you will have to do everything manually. so be prepared for a handful of work.
AVCam demo app by Apple
I wanted to use the UiImagePicker to record a video then let the user browse the frames using the scrollview built in the UiImagePicker and while at it, select a few frames that interest the user.
I know I can overlay a control on top of the uiimagepicker to trigger the selection
What I am not sure about is whether I have programatic access to the current frame shown by the UIImagePicker for me to extract an image out of it.
Please let me know if this is doable/possible.
Are there any other time efficient/elegant ways to achieving the above?
I had created by own view with video recording and frame selection (using AVCaptureSession, AVCaptureVideoDataOutput) but would take me quite a bit of time to polish it to make it look good like UIImagePicker plus everyone is familiar with the default camera app in the iPhone.
I hope it makes sense what I want to achieve.
I know one can kind of achieve the goal by taken a screenshot of the screen but I just want the user to click one button to capture the current show frame.
Thanks
Screenshot method did not work for frozen frame from the video recording.
Went with a custom AVFoundation based frame capture.
I have to figure out the best way to transition from one video to the next
BASIC IDEA: An example would be that there is a video of a person walking.....the user taps the video and a seamless transition occurs to a video of a person running (over simplified example)
My first thought was to create 2 movie players and use transitions between the 2 view elements. But movie-player doesn't support that.
stopping the current video, loading new content, and then starting it is a solution but not very elegant. We are making a interactive sales tool for our reps and we want this to look as professional as possible.
CURRENT THOUGHT: If there was some sample code for AVPlayer, it would seem I could use AVVideoComposition to switch between videos? But details on how that might happen don't seem to be currently available.
POSSIBLE CLUE: I figured this would be easy as I bought an app called Live Cams HD that shows 16 different video feeds at once.
Any ideas? Thanks in advance!
Steve, the short answer is that you are not going to be able to get the kind of results you want using AVPlayer. The h.264 video logic included in iOS is really great at playing video and video/audio together, but it really sucks at starting/stopping and switching from one clip to another. The reason is that there is a lot of buffering that needs to happen to load up and start playing a h.264 video in hardware. Basically, you need to roll your own code that sets UIImage/CGImageRef for your views in a way that makes it easy to switch from one clip to another by simply switching from one array of UIImage objects to another. Of course, that is easy to say yet not so easy to implement.
What I would suggest is that you evaluate existing code that already implements this logic instead of rolling your own. For example, have a look at this StreetFighter demo app. It shows how a very simple game like iPhone UI can be constructed using a series of clips that show a character doing a kick, a punch, or throwing a fireball. The results looks like this:
I also wrote up a blog post about seamless-video-looping-on-ios. You can of course roll your own code to do all this, but I would suggest reading more about my library at the linked website as it will save you a lot of time.
After the first video has played every frame except the last one, you quickly swap to a view with an image of the last frame (basically the last frame) and then you transition into a view with the an image of the first frame of the next video and start up that one.
Or you could create a animation with all your frames (programming your videos), that will make it customizable, but the quality will probably not be as good and the cpu usage can spike, so you will have to make a call on that one.
Does anyone know how to do this?
Is anyone able to provide an example? I believe this is out of NDA now as was available in version 4.0 ?
Take a look to AVFoundation framework , specially to avcapture avsession avinputdevice, etc. You can find some listings in the iPhone dev center forums: search "avcapture"
AVFoundation is the framework you want to use to record, modify raw frames, show them, an offcourse add some overlay
If you want to do only overlay then, UIImagePickerController should b enough.
If i understand, what you are trying to do corectly, you have set up video capture someting like suggested by Apple in this Q&A:http://developer.apple.com/iphone/library/qa/qa2010/qa1702.html
From there it shouldn't be much of a Problem to use the method described in this answer:blend two uiimages based on alpha/transparency of top image to blend the preview with your overlay, provided you draw it in a UIImage first. Feed the resulting images to a buffer and save it accordingly.
Though, this method most certainly wouldn't give you a lot of frames per second.
I want to do something as follows.
When user is capturing the video from his iPhone 3G, 3GS and iphone4, he should be able to show some data on the screen which will be captured on the video it self, so when we will see the video again, he will be able to see the video along with data on screen.
Like for example we can say I want to display the speed of the vehicle when video was being captured. So when user will see this video after words, he should be able to see the speed on the video it self.
Is this possible in iPhone??? or any body having other ideas for this.
Thanks in advance...
Regards,
VIshaL
It sounds like you want to create some sort of dynamic video overlay.
This is your single best bet towards what you are asking, but I am unsure if it will lead you to the result you need as it may be too dynamic in nature.
http://blog.blackwhale.at/2009/10/custom-video-overlay-view-on-the-iphone/
I hope this helps.