I'm using ofVideoPlayer and for some reason there is some flicker/tear the moment of the transitions between the videos. I've tried to change the video format, i added ofSetVerticalSync(true);and it stills gets that error.
How can i fix this?
I had a lot of struggle with Openframeworks and Tearing.
Basically, it depends a lot on your Hardware.
You may install drivers to force the graphic cards vsync.
It is more true if you run OF with Linux OS.
If you are on windows certainly look into the graphics cards settings panel and experiment with different settings for vertical sync.
If you are on on OSX there are some other video players you might want to test.
http://forum.openframeworks.cc/t/ofxavfvideoplayer/12770
Recently I have had the best results with the HAP codec and the hap player. It loads super quick and supports alpha channels. I would definitely try that.
https://github.com/bangnoise/ofxHapPlayer
Related
I have a project that uses libmpv with the opengl widget (as per the examples that come with libmpv) along with a QtWebEngine widget that displays information, graphics and animations (a scrolling ticker for example).
I found that of the video playback options in Qt, mpv was the smoothest and most reliable. It will play back perfectly smoothly any video up to 1080p.
However while video is playing, any animations in QtWebEngine are unsmooth and jittery. Video is also slightly less smooth when something is moving in the webpage.
The system I'm testing with is not struggling for resources (cpu use is around 45%). There is also not any video decoding, as it's playing back raw video (but while it plays back encoded video, the effect is the same, regardless if hardware acceleration is enabled or not).
I figure that the mpv widget is interrupting the MainWindow thread while it processes frames and causing it to freeze every few milliseconds.
As far as I know there is no way to separate the mpv thread from the MainWindow thread though.
I don't know if it'll be possible to make mpv and webengine work together smoothly. I feel like there must be some way to run two widgets at once in one window and not have them mess with each other.
I'm testing with Ubuntu 18.04, QT 5.11 and the latest mpv from git.
Does anyone have any advice or pointers for what to try first? I realise this is somewhat of a broad question but my knowledge of graphics is limited. If anyone has advice on a conceptual level (I don't need someone to code me a fix) I can investigate myself.
Thank you.
So I am trying to figure out how get a video feed (or screenshot feed if I must) of the Desktop using OpenGL in Windows and display that in a 3D environment. I plan to integrate this with ARToolkit to make essentially a virtual screen. The only issue is that I have tried manually getting the pixels in OpenGl, but I have been unable to properly display them in a 3D environment?
I apologize in advance that I do not have minimum runnable code, but due to all the dependencies and whatnot trying to get an ARToolkit code running would be far from minimal. How would I capture the desktop on Windows and display it in ARToolkit?
BONUS: If you can grab each desktop from the 'virtual' desktops in Windows 10, that would be an excellent bonus!
Alternative: If you know another AR library that renders differently, or allows me to achieve the same effect, I would be grateful.
There are 2 different problems here:
a) Make an augmentation that plays video
b) Stream the desktop to somewhere else
For playing video on an augmentation you basically need to have a texture that gets updated on each frame. I recall that ARToolkit for Unity has an example that plays video.However.
Streaming the desktop to the other device is a problem of its own. There are tools that do screen recording, but you probably don't want that.
It sounds to me that what you want to do it to make a VLC viewer and put that into an augmentation. If I am correct, I suggest you to start by looking at existing open source VLC viewers.
I am writing an application which will allow the user to scrub through an open video. Developing on Windows 7/8 with Qt 5.3, I have been using QMediaPlayer and QVideoWidget following the qvideowidget example project. The result has been pretty good, except that the QVideoWidget seems only to update during idle time. Still, it's a good start and it's usable.
However, when I build on Mac OS 10.10 (again with Qt 5.3), scrubbing behaves as though there were only one frame per second in the video. As I drag the "position" slider, the video jumps from one frame to the frame one second later, then one second after that, even though I am calling QMediaPlayer::setPosition several times with positions between those two frames.
The problem can be reproduced using the videowidget example that ships with Qt 5.3 here: Qt\Examples\Qt-5.3\multimediawidgets\videowidget. When the slider is dragged on a Windows machine, the QVideoWidget moves between frames that are spaced fairly close together. When the slider is dragged on a Mac (at least on mine), the QVideoWidget jumps between frames spaced about one second apart. No matter how long I wait for an "in between" frame to render, it won't happen unless I hit the "play" button.
I've tried calling QMediaPlayer::play() and QMediaPlayer::pause() one after the other to force an update, but this doesn't seem to work--QMediaPlayer works asynchronously, so the update doesn't have time to take effect.
If I check the value of QMediaPlayer::position, I find that it actually doesn't change between these jumps. It appears that when I call QMediaPlayer::setPosition, it is actually rounding the position to one second increments on a Mac and finer increments on a Windows machine.
Ideally, I would like to jump to a particular position in the video and render that frame immediately on the QVideoWidget. Is there any way to force QMediaPlayer to set the position accurately and update the associated QVideoWidget? Is there a better way to implement smooth scrubbing in a video?
Thanks for your help!
In case anyone else has a similar problem...
My best guess is that the issue stems from limitations in the codec used by QMediaPlayer, since this seems to be the main difference between the two platforms. Rather than deal with the codec issues directly, I looked around for other options.
MLT (http://www.mltframework.org/) seemed promising, but it is a major pain to compile and the primary author seems to have settled on offering SDK support to commercial users only.
libVLC (https://wiki.videolan.org/LibVLC/) looks a lot better. In particular, I’ve been using vlc-qt (https://github.com/ntadej/vlc-qt). The latter has an interface that will look quite familiar to users of QMediaPlayer and QVideoWidget. It was an easy replacement in my own application, and the result was much smoother video scrubbing on both Windows and Mac.
Hope this helps someone else!
I'm looking for a solution to play HD videos on a multimonitor OSX environment for a projector/desktop application. It could be one huge video, or a video split in parts.
So far I've been using Flash StageVideo successfully to play 1080p and 720p on single monitors. This works great with flash projectors. The problem with flash projectors is you can't span multiple monitors, or multiple windows. I still haven't tried opening multiple projectors, because I wouldn't know how to position each projector in a different monitor consistently.
In Adobe AIR you can have multiple windows and control their position, but AFAIK you can't use StageVideo to decode videos with the GPU... and using the classic Video class is really out of the question.
With C++ there are multiple frameworks (cinder/openFrameworks) but AFAIK opening multiple windows, or spaning multiple monitors is not such a good idea because of bad performance. I stil haven't figured out if it's possible or even a good idea to open one app per monitor and control it's position.
Has anyone succeeded in this problem using AS3 or any other language/framework like C++ with openFrameworks?
With AIR you can have a single window span multiple windows.
I have a 1920x1080 video scaled by 2 on stage of 3840x2160. I haven't yet tried using StageVideo to up the resolution, but I am hopeful it will work.
I want to add an animation in starting screen of my game. I did that animation in flash. how to load it in cocos2d
Don't think you're going to be able to do this. Flash has never been able to run on the iPhone/iPod and very likely never will at least for the foreseeable future. Someone would have to write a custom SWF file loader and player specifically for Cocos (no small task). Even then I doubt Apple would allow such an application to be approved. I would suggest converting your SWF to an iPhone/iPod compatible movie format. QuickTime (mov) for sure is supported, mpg and avi may work as well.
There is and will be no Flash support on the iPhone. You'd have to to convert the animation into single images and use cocos2d's animation system.
The thing you wanted four years ago has released! It's called GAF This is library and a converter for flash animations.