I would like to turn off vlc's hardware acceleration option to avoid some lagging issue caused by a graphic card's driver bug. I tried to pass in that option in the prepareMedia method. That didn't help (as it would when I did it through command line: vlc --no-overlay 'path-to-video'). It actually even seemed to make the playback a bit more laggy. Below is part of my code to set up the player. I actually tried playMedia("path-to-video","--no-overlay") and that didn't work either.
mediaPlayerComponent = new EmbeddedMediaPlayerComponent();
player = mediaPlayerComponent.getMediaPlayer();
...
player.prepareMedia("path-to-video","--no-overlay");
Some of those options must be passed when creating the MediaPlayerFactory rather than when playing the media - as to why it's like this, well it's just how LibVLC works.
If you're using EmbeddedMediaPlayerComponent you can do something like this to supply those options:
mediaPlayerComponent = new EmbeddedMediaPlayerComponent() {
protected String[] onGetMediaPlayerFactoryArgs() {
return new String[] {"--no-overlay"};
}
}
Note that this will replace the default media player factory arguments so you might like to specify some other ones too - these are the defaults:
protected static final String[] DEFAULT_FACTORY_ARGUMENTS = {
"--video-title=vlcj video output",
"--no-snapshot-preview",
"--quiet-synchro",
"--sub-filter=logo:marq",
"--intf=dummy"
};
So that is how you set such native VLC options, but whether this particular option will do what you actually want (and without any other side effects) is another matter.
Related
I am learning about fluid dynamics (and Haxe) and have come across this awesome project and thought I would try to extend to it to help me learn. A demo of the original project in action can be seen here.
So far, I have created a side menu of items containing different shapes. When the user clicks on one of the shapes, then, clicks onto the canvas, the image selected should be imprinted onto the dye. The user will then move the mouse and explore the art etc.
To try and achieve this I did the following:
import js.html.webgl.RenderingContext;
function imageSelection(): Void{
document.querySelector('.myscrollbar1').addEventListener('click', function() {
// twilight image clicked
closeNav();
reset();
var image:js.html.ImageElement = cast document.querySelector('img[src="images/twilight.jpg"]');
gl.current_context.texSubImage2D(cast fluid.dyeRenderTarget.writeToTexture, 0, Math.round(mouse.x), Math.round(mouse.y), RenderingContext.RGB, RenderingContext.UNSIGNED_BYTE, image);
TWILIGHT = true;
});
After this call, inside the update function, I have the following:
override function update( dt:Float ){
time = haxe.Timer.stamp() - initTime;
performanceMonitor.recordFrameTime(dt);
//Smaller number creates a bigger ripple, was 0.016
dt = 0.090;//#!
//Physics
//interaction
updateDyeShader.isMouseDown.set(isMouseDown && lastMousePointKnown);
mouseForceShader.isMouseDown.set(isMouseDown && lastMousePointKnown);
//step physics
fluid.step(dt);
particles.flowVelocityField = fluid.velocityRenderTarget.readFromTexture;
if(renderParticlesEnabled){
particles.step(dt);
}
//Below handles the cycling of colours once the mouse is moved and then the image should be disrupted into the set dye colours.
}
However, although the project builds, I can't seem to get the image imprinted onto the canvas. I have checked the console log and I can see the following error:
WebGL: INVALID_ENUM: texSubImage2D: invalid texture target
Is it safe to assume that my cast for the first param is not allowed?
I have read that the texture target is the first parameter and INVALID_ENUM in particular means that one of the gl.XXX parameters are just flat out wrong for that particular function.
Looking through to the file writeToTexture is declared as so: public var writeToTexture (default, null):GLTexture;. WriteToTexture is a wrapper around a regular webgl handle.
I am using Haxe version 3.2.1 and using Snow to build the project. WriteToTexture is defined inside HaxeToolkit\haxe\lib\gltoolbox\git\gltoolbox\render
writeToTexture in gltoolbox is a GLTexture. With snow and snow_web, this is defined in snow.modules.opengl.GL as:
typedef GLTexture = js.html.webgl.Texture;
So we're simply dealing with a js.html.webgl.Texture here, or WebGLTexture in native JS.
Which means that yes, this is definitely not a valid value for texSubImage2D()'s target, which is specified to take one of the gl.TEXTURE_* constants.
A GLenum specifying the binding point (target) of the active texture.
From this description it's obvious that the parameter isn't actually for the texture itself - it merely gives some info on how the active texture should be used.
The question then becomes how the "active" texture can be set. bindTexture() can be used for this.
Assuming a scenario where DX12 is being hooked for overlay rendering it looks like the best function to hook is the IDXGISwapChain::Present the same way it was done for DX11. Having this function hooked the swap chain is available and from that the device can be retrieved to create resources. Given those resources it’s possible to record rendering commands too. The problem arises when we are trying to execute the rendering commands as there is no option to retrieve the associated command queue from the swap chain so there is nothing like this:
CComPtr<ID3D12Device> pD3D12Device;
if (pSwapChain->GetDevice(__uuidof(ID3D12Device), (void**)(&pD3D12Device)) == S_OK)
{
pD3D12Device->GetCommandQueueForSwapChain( swapChain )->ExecuteCommandLists(…);
}
The other option would be creating a new command queue to execute on, like this:
CComPtr<ID3D12Device> pD3D12Device;
if (pSwapChain->GetDevice(__uuidof(ID3D12Device), (void**)(&pD3D12Device)) == S_OK)
{
D3D12_COMMAND_QUEUE_DESC queue_desc = {};
queue_desc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE;
queue_desc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT;
HRESULT commandQueueRes = _device->CreateCommandQueue( &queue_desc, IID_PPV_ARGS( &_commandQueue ) );
_commandQueue->ExecuteCommandLists( ... );
}
This results in an error and subsequent device removal. See the error message below.
D3D12 ERROR: ID3D12CommandQueue::ExecuteCommandLists: A command list, which writes to a swap chain back buffer, may only be executed on the command queue associated with that buffer. [ STATE_SETTING ERROR #907: EXECUTECOMMANDLISTS_WRONGSWAPCHAINBUFFERREFERENCE]
The problem is not resolved even if the ID3D12CommandQueue::ExecuteCommandLists is hooked as well because there is no way to retrieve the associated swap chain from the command queue either.
So my question is what is the recommended way to deal with this problem in a scenario where the swap chain creation happens before the hooking could possibly happen?
In case anyone is looking for the answer here's what I found out.
There is no official way to do this, for overlay rendering the recommended way is to use DirectComposition but this has performance consequences which is not very nice for game overlays.
Investigating the memory a bit there is a possible solution to get the CommandQueue from the swap chain with something like this:
#ifdef _M_X64
size_t* pOffset = (size_t*)((BYTE*)swapChain + 216);
#else
size_t* pOffset = (size_t*)((BYTE*)swapChain + 132);
#endif
*(&_commandQueue) = reinterpret_cast<ID3D12CommandQueue*>(*pOffset);
Obviously this solution is not recommended but it might be useful if someone just want's to do some debugging.
My final solution is to hook into a function that uses the CommandQueue (I use ExecuteCommandLists) and get the pointer there and use it later to render the overlay. It's not completely satisfying but it works as long as there are no multiple swap chains.
Salve! When I try Mozilla's Validator on my addon, it get the following error related to my treatment of clipboard usage:
nsITransferable has been changed in Gecko 16.
Warning: The nsITransferable interface has changed to better support
Private Browsing Mode. After instantiating the object, you should call
the init function on it before any other functions are called.
See https://developer.mozilla.org/en-US/docs/Using_the_Clipboard for more
information.
var trans = Components.classes["#mozilla.org/widget/transferable;1"].createInstance(Components.interfaces.nsITransferable);
if ('init' in trans){ trans.init(null);};
I can't understand this.
Here is my code - I am clearly calling trans.init:
var clip = Components.classes["#mozilla.org/widget/clipboard;1"].getService(Components.interfaces.nsIClipboard);
if (!clip) return "";
var trans = Components.classes["#mozilla.org/widget/transferable;1"].createInstance(Components.interfaces.nsITransferable);
if ('init' in trans){ trans.init(null);}; //<--IT DOESN'T LIKE THIS
if (!trans) return false;
trans.addDataFlavor("text/unicode");
I've also tried the Transferable function from Mozilla's example here, but get the same non-validation report.
One of the Mozilla AMO editors told me to write exactly this, and it still doesn't validate.
I've also tried, simply:
var trans = Components.classes["#mozilla.org/widget/transferable;1"].createInstance(Components.interfaces.nsITransferable);
trans.init(null); //<---LOOK HERE
if (!trans) return false;
trans.addDataFlavor("text/unicode");
The Validator does not report any errors - just this warning. Everything works properly. Mozilla updated their Gecko engine, and they want devlopers to match up to the new standard.
In my usage, we want to be able to use the contents of the clipboard that was probably gotten from outside the application, too, so we do want to call the init function with null instead of window.
Any advice would be wonderful!
trans.init(null) is valid in some circumstances, such as yours. It can also cause privacy leaks if used in the wrong circumstances, so the validator flags all uses of it as potentially requiring changing. Therefore, it is a warning that you can ignore in this case.
i have two volumes (.nrrd) of different qualities. the user can browse through the layers. if a key is pressed
i want to load the slice of the volume with better quality.
my volume is similar to this one: lesson 10 xtk
i've found:
volume.children[2].children[0].children[0].texture.file = "http://path/to/file.ext";
but if i apply some kind of file (.jpg, .dcm) nothing happens.
is this the right approach to change the slice to go inside the children and change the texture?
or shall i load the selected slice seperate as an object and apply it to the "lower-quality-volume" somehow?
edit:
this is what i tried so far (i get errors with dcms but not with jpgs):
if (event.keyCode == 83) { // "s"-button
volume.children[2].children[0].children[0].texture.file = "http://localhost:3000/112.jpg";
volume.children[2].children[0].children[0].modified();
r.render();
}
edit2: this is whats in my r.onShowtime = function() {}
volume.children[2].children[0].texture.file = 'http://localhost:3000/112.jpg';
volume.children[2].children[0].visible = true; // to activate the first layer
volume.children[2].children[0].modified();
console.log(volume.children[2].children[0].visible +" "+ volume.children[2].children[0].texture.file);
it outputs "true hostname/112.jpg"
when i inspect the .jpg in firebug the header is ok but the answer is "null"
when i inspect console.log(volume.children[2].children[0]); with firebug
.texture.file is set to hostname/112.jpg
when i go to "network" the .jpg has been transfered successfully
please notice that 112.jpg and level.jpg are the same. the first one is getting loaded in r.onShowtime and the other one is loaded at a keypressed event.
EDIT 3: volume.children[2].children[0] is of the type "X.slice", isn't it?
here is my approach: jsFiddle
and this is my actual issue and still not working: jsFiddle
Mhh..
I think a call to object.modified() is missing in the file setter (and in others setters from inject classes). Let's see when Haehn will come if he wants to change something internaly, but for the moment could you try to call it by yourself ?
You can try to add after the modification of texture :
volume.children[2].children[0].children[0].modified();
And if it doesn't work, in addition :
renderer.render();
Edit :
It's strange, I did a similar code and it did something. Can you please try something like that with opening your javascript console (Firefox, Chrome,... has one) and tell me the error you get ?
renderer.onShowtime = {
for (var i=0 ; i< volume.children[2].children.length ; i++) {
volume.children[2].children[i].texture.file="myimage.jpeg";
volume.children[2].children[i].modified();
}
}
It is important you call it in the onShowtime, because before the volume is not loaded, and so slicesX, slicesY... don't exist.
Edit2 :
Hey,
Thanks to the informations you added I think I've got the point ! In the render() method of our renderer3D there is a test on texture._dirty flag, that you cannot change from outside the framework. In addition the 1st rendering with a texture make that flag false, and loading a new texture doesn't seem to set that flag back to true in the current XTK. So, I think, we have to add it in the loader.load(texture, object) method. I'll make an issue on Github and see what Haehn thinks of it !
I'm trying to write an little application that dynamically plays a single movie file repeatedly. I wrote it in Python, using these VLC-Python bindings
I would say that this wouldn't be so hard and even though the very sparse documentation I can get a movie fullscreen without anything else on the screen and even change the file I want to play. What I cannot is simply let a single movie repeat.
I use the following code:
self.media = []
A --repeat-tag here:
self.vlc_inst = vlc.Instance('--mouse-hide-timeout=0', '--fullscreen', '--repeat')
And a '--repeat' tag here:
self.media = self.vlc_inst.media_new(NEW_VIDEO_NAME + str(currentVideoN) + VIDEO_EXTENSION, '--repeat')
self.player = self.vlc_inst.media_player_new()
self.player.set_fullscreen(True)
self.player.set_media(self.media[currentVideoN])
self.player.play()
These repeat tags don't seem to do anything. The Instance class does have a function vlm_set_loop(self, psz_name, b_loop) but I have no idea what mrl should be. In the original code I figured out it should be a char-array (String), but I have no clue what kind of String this should be.
Anyone who does have a clue?
well, this question is pretty old, but anyways... i think instead of using '--repeat' (which only works with a medialist rather than a single mediafile afaik) in your vlc.Instance you could use somthing like '--input-repeat=999999' it's not really a loop, but as close as it gets (again: afaik ;-) )
I was able to make the media replay by setting the media to it's current media and calling play. Is the code trash? Yes, it is: the back function may not be called inside the onEnd function, else i won't full fill by some reason. Does it work? Yes
import vlc
doTrashCode = False
player = vlc.MediaPlayer("C:/Users/benj5/Videos/2019-04-29 22-14-55_Trim.mp4")
def start():
player.set_fullscreen(True)
em = player.event_manager()
em.event_attach(vlc.EventType.MediaPlayerEndReached, onEnd)
player.play()
def onEnd(event):
global doTrashCode
if event.type == vlc.EventType.MediaPlayerEndReached:
doTrashCode = True
def back():
player.set_media(player.get_media())
player.play()
start()
while True:
if doTrashCode:
back()
doTrashCode = False
you can use subprocess
p = subprocess.Popen('cvlc', 'fullscreen', 'home/pi/demo.mp4', '--loop')
I used VLC instead of CVLC earlier but it wasn't working fine for me, it was reloading and resizing the VLC player when the loop end