All Questions
Tagged with hardware-acceleration ios
18 questions
1
vote
1
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2k
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Getting Compression status as -12902(kVTParameterErr) in output callback from iOS Hardware acceleration encode using video toolbox
I try using CVPixelBufferCreateWithPlanarBytes. I do not see any error returned by CVPixelBufferCreateWithPlanarBytes, VTCompressionSessionEncodeFrame. But the output callback gives an error ...
- 51
3
votes
2
answers
660
views
Can VToolBox run background on IOS?
I want to compress some data with VToolBox. When I run my app in the foreground it runs well, but when I run my app in the background it gives no compressed data anymore...
I added logs when the ...
- 31
1
vote
0
answers
376
views
iOS: VideoToolBox decompress h263 Video abnormal
I am working on H263 decompression with VideoToolBox.but when decoding 4CIF video stream, the output pixel data are all 0 value, and there is no error info.
I don't know why this happened, as video ...
- 11
0
votes
1
answer
5k
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turn off Hardware acceleration in iOS
I use a UITextView to show some arabic text in my app. On some devices the text is not clear. Some experts told me to turn off hardware acceleration for the app. The text is rendering not rendered in ...
5
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2
answers
2k
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Enabling hardware acceleration: translate3d
As David Walsh briefly discusses, it is possible to force hardware acceleration with a zero-based translate3d property in CSS.
It works like this:
.animClass {
-webkit-transform: translate3d(0, ...
- 28.4k
0
votes
2
answers
982
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Safari iO7: flicker on page transition when using css hardware acceleration
The problem I am having is when viewing my site through any iOS 7 device with Safari.
Every time I change page on my website the browser window goes white, and then a moment later the page starts ...
- 113
15
votes
2
answers
20k
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How to decode a H.264 frame on iOS by hardware decoding?
I have been used ffmpeg to decode every single frame that I received from my ip cam. The brief code looks like this:
-(void) decodeFrame:(unsigned char *)frameData frameSize:(int)frameSize{
...
- 273
3
votes
1
answer
956
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Hardware Acceleration on Web Application Memory Leak
I have been building web applications using PhoneGap/Cordova and have been working well.
The apps consist of a series of slides, that the user can swipe to get to the next slide. I have been using ...
- 620
3
votes
1
answer
2k
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How to hardware accelerate a box-shadow animation in CSS?
I am animating on a box-shadow with CSS. Using Instruments program, I discovered that this animation alone is taking 35% of the CPU on iOS Safari! The iPhone become hotter and hotter when I leave the ...
- 3,785
2
votes
1
answer
524
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How can i use the accererometer to check whether the device is stable?
I know how to get the accel data but was wondering if anyone knows of any code samples that would determine whether the ios device is stable (swaying or shaking)
- 409
2
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1
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1k
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iOS -- OpenSSL and Accelerated Cryptography?
I know that all but the older iPhones and all iPads have a built-in cryptographic accelerator, used to make key generation and encryption faster on those devices. In my application, I am using ...
- 12k
3
votes
2
answers
4k
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Mobile GPU accelerated slideToggle functionality
I'm developing an interface for a mobile app in HTML and CSS. The app uses a lot of forms and I want to use jQuery slideToggle functionality to show and hide the less frequently used elements.
...
- 31
14
votes
8
answers
7k
views
iOS6 UIwebView CSS3D transforms are not HW accelerated
I have problems with poor scrolling performance in iOS6 UIWebView component..In iOS5 scrolling was really fluid, though. So I have searched the web little bit and found this (part of iOS6 beta ...
- 7,384
1
vote
0
answers
881
views
iPhone hardware audio decoding with multiple simultaneous audio files
I'm developing an iPhone app that plays long (~30min) m4a audio clips. The clips are all stored locally and I'm using AVAudioPlayer to handle the playback functions. My app crossfades audio so that ...
- 4,406
1
vote
1
answer
521
views
What conditions must be met for iPad/iPhone hardware accelerated animations?
I'm just wandering what I must do to get hardware accelerated animations ? Do I have to se doctype HTML5 or can I use HTML4.01 or something similar ? Are there any other limitations / things I must do/...
- 4,748
0
votes
2
answers
1k
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Hardware accelerated css3 transitions for ios
I don't think my translate3d is forcing hardware acceleration (of top / bottom positioning). What am I missing?
.image {
background:yellow;
-webkit-perspective: 1000;
-webkit-...
- 17k
1
vote
3
answers
1k
views
Does the iPad 2 perform better than iPad 1 with CSS3 animations?
After developing with HTML5 and CSS3 applications on the iPad 1, we have been disappointed with the performance of CSS3 animations/transitions/transforms (hardware accelerated). We're hoping that the ...
- 9,251
21
votes
3
answers
11k
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Does iPhone support hardware-accelerated AES Encryption?
I could find references to "hardware-accelerated AES encryption" on an iPhone/iPad. But the APIs that I could find to do the AES encryption (CCCrypt) don't talk about hardware-acceleration at all.
...
- 341