I am starting with the sample LibVLCSharp.WPF.Sample and while it plays my VOB, I cannot change the audio track.
I call SetAudioTrack and it always returns false (and doesn't change). Full VLC lets me change the audio track on the same file just fine.
var media = new Media(_libVLC, clip.GetEvoPath(playlist), FromType.FromPath);
var status = await media.Parse();
_mediaPlayer.Playing += (sender, e) =>
{
bool ok = _mediaPlayer.SetAudioTrack(3);
};
_mediaPlayer.Play(media);
When should I call this, to get it to work? Ideally I would like to set the stream before I start playback, but that doesn't work either.
Related
I'm making a program that will output text to speech, the user will need to be able to change the output device (for example to virtual audio cable). At the moment I'm using https://www.npmjs.com/package/say to produce the speech
e.g.
const say = require("say");
say.speak("Hello World");
but I've no clue on how I could go about choosing the audio output.
What I've found so far has been pretty useless, I'm guessing largely because I don't know the proper terminology to search for answers, regardless this is it:
I first found out about navigator.MediaDevices, then I found how I could make an audio element and change the audio device of that element via setSinkId, then I realized these things are probably(?) irrelevant since the say module seems to play sounds using powershell commands. I've even gone as far as trying to change powershell's output device in app volume device preferences(img), but that seems to do nothing.
I'm pretty much stumped right now, so I'd appreciate any help please. I'm not set on using Say as a module, it just seemed easy to use at first.
Edit:
A workaround I've settled with is making my own TTS class and using SpVoice.
I have something similar to this:
const childProcess = require('child_process');
class TTS {
constructor(channel, speed) {
this.speed = speed;
this.channel = channel;
this.baseCommand = "$speak = New-Object -ComObject SAPI.SPVoice;"
}
speak(text){
var command = this.baseCommand +
`$speak.AudioOutput = foreach ($o in $speak.GetAudioOutputs()) {if ($o.getDescription() -eq '${this.channel}') {$o; break;}}; `
+ "$speak.Speak([Console]::In.ReadToEnd());"
this.child = childProcess.spawn('powershell', [command], {shell: true})
this.child.stdin.setEncoding('ascii')
this.child.stdin.end(text);
this.child.addListener('exit', (code, signal) => {
if (code === null || signal !== null) {
console.log(new Error(`error [code: ${code}] [signal: ${signal}]`))
}
this.child = null
})
}
}
Then I can pass in an audio channel like
tts = new TTS("CABLE Input (VB-Audio Virtual Cable)", 0);
tts.speak("Hello there");
and it will output TTS in my desired channel
Some of the browsers support the built in speechSynthesis API.
Save the following code in 'test.html' file and open the file in chrome web browser for testing the speech api.
<script>
//---------------- SpeechAPI Start ------------------------
function speak(message) {
try {
var utterance= new SpeechSynthesisUtterance("");
utterance.lang='en-GB';
utterance.text=message;
window.speechSynthesis.speak(utterance);
}catch(e){
console.log('Exception in speak : ' + e)
}
}
//---------------- SpeechAPI End ------------------------
</script>
<button onclick="speak('Hello, how are you doing?');">Press to speak</button>
Is this what you are looking for ?
I'm interested in getting a screenshot from the user and I'm using the getDisplayMedia API to capture the user's screen:
const constraints = { video: true, audio: false };
if (navigator.mediaDevices["getDisplayMedia"]) {
navigator.mediaDevices["getDisplayMedia"](constraints).then(startStream).catch(error);
} else {
navigator.getDisplayMedia(constraints).then(startStream).catch(error);
}
When executed, the browser prompts the user if they want to share their display. After the user accepts the prompt, the provided callback receives a MediaStream. For visualization, I'm binding it directly to a element:
const startStream = (stream: MediaStream) => {
this.video.nativeElement.srcObject = stream;
};
This is simple and very effective so far. Nevertheless, I'm only interested in a single frame and I'd therefore like to manually stop the stream as soon as I've processed it.
What I tried is to remove the video element from the DOM, but Chrome keeps displaying a message that the screen is currently captured. So this only affected the video element but not the stream itself:
I've looked at the Screen Capture API article on MDN but couldn't find any hints on how to stop the stream.
How do I end the stream properly so that the prompt stops as well?
Rather than stopping the stream itself, you can stop its tracks.
Iterate over the tracks using the getTracks method and call stop() on each of them:
stream.getTracks()
.forEach(track => track.stop())
As soon as all tracks are stopped, Chrome's capturing prompt disappears as well.
start screen capture sample code:
async function startCapture() {
logElem.innerHTML = "";
try {
videoElem.srcObject = await navigator.mediaDevices.getDisplayMedia(displayMediaOptions);
dumpOptionsInfo();
} catch(err) {
console.error("Error: " + err);
}
}
stop screen capture sample code:
function stopCapture(evt) {
let tracks = videoElem.srcObject.getTracks();
tracks.forEach(track => track.stop());
videoElem.srcObject = null;
}
more info: MDN - Stopping display capture
I'm using the videojs-playlist plugin along with Google's videojs-ima plugin. Everything works swimmingly except I am only getting a preload ad before the first video. I want one before each video in the playlist.
Basic setup is boilerplate, but for reference:
this.player = videojs('currentvideo', { autoplay : true, fluid : true });
this.player.playlist(this.playlist);
this.player.playlist.autoadvance(5);
const skippable_linear = {google's test ad};
const options = {
id: 'currentvideo',
adTagUrl: skippable_linear,
debug : true
};
this.player.ima(
options
);
this.player.ima.requestAds();
I have tried various ways of manually calling ads from inside an 'ended' event handler, such as calling requestAds again:
const _this = this;
this.player.on( 'ended', function(){
/* some other stuff */
_this.player.ima.requestAds();
});
This does play an ad where I want it, but
this breaks playlist's 'autoadvance' setting (next video doesn't start playing when the ad is finished), and
this puts the player into "ad display" mode (scrubber is unavailable, etc).
Is there a simple way to just say, "play an ad now" programmatically? I've tried, without joy, to use all of the seemingly applicable methods exposed by both the ima plugin and the contrib-ads plugin it relies on. I'll admit here that this is the first time I've ever had to deal with videos that run ads, so I'm kind of a noob.
I am trying to do the same thing. Just like you I failed when calling player.ima.requestAds() on events. I dug deeper and the best I could come up with is what I share bellow.
According to the videojs-ima API you have to use the setContentWithAdTag method instead of whatever you are using to switch the player content. In our case it is the player.playlist.next method.
I combined the code found in the videojs-ima examples with the original playlist.next to write my own next.
Then quite brutally I overrode the original plugin method.
Here's the code:
player.playlist(myPlayilst);
player.playlist.autoadvance(2);
player.playlistUi(); //videojs-playlist-ui
player.ima({
id: 'video5',
adTagUrl: 'thy adserver request'
});
//override playlist.next
player.playlist.next = function(){
var nextIndex = 0,
playlist = this.player_.playlist,
list = this.player_.playlist();
//everything below is copied directly from the original `next` (except for the "//load with ad")
// Repeat
if (playlist.repeat_) {
nextIndex = playlist.currentIndex_ + 1;
if (nextIndex > list.length - 1) {
nextIndex = 0;
}
} else {
// Don't go past the end of the playlist.
nextIndex = Math.min(playlist.currentIndex_ + 1, list.length - 1);
}
// Make the change
if (nextIndex !== playlist.currentIndex_) {
//load with ad
this.player_.playlist.currentItem(nextIndex);
this.player_.ima.setContentWithAdTag(
this.player_.playlist.currentItem(),
null,
true);
this.player_.ima.requestAds();
/////
return list[playlist.currentItem()];
}
}
You will probably need to override other methods that change the current playback, like playlist.previous.
I use videojs-playlist-ui so in my case it was neccessary to change the onclick handler called switchPlaylistItem_. I used some good old brute force to do that like this:
videojs.getComponent('PlaylistMenuItem').prototype.switchPlaylistItem_ = function(e){
this.player_.playlist.currentItem(this.player_.playlist().indexOf(this.item));
this.player_.ima.setContentWithAdTag(
this.player_.playlist.currentItem(),
null,
true);
this.player_.ima.requestAds();
};
PlaylistMenuItem's prototype should be changed before initializing the player.
This solution works, but it feels hacky, so if anyone can come up with something cleaner, please share!
I ended up forking videojs-playlist, and adding the option to override the player.src method. Feel free to use it:
fw-videojs-playlist
Details on how to use it are all in the github readme (including an example with ima.setContentWithAdTag)
I am creating an actionscript video player in Haxe and to avoid the asyncError I am trying to create a custom Object. How do I do this is Haxe?
The client property specifies the object on which callback methods are invoked. The default object is the NetStream object being created. If you set the client property to another object, callback methods will be invoked on that other object.
Here is my code.
public function new()
{
super();
trace("video");
//initialize net stream
nc = new NetConnection();
nc.connect(null);
ns = new NetStream(nc);
buffer_time = 2;
ns.bufferTime = buffer_time;
//Add video to stage
myVideo = new flash.media.Video(640, 360);
addChild(myVideo);
//Add callback method for listeing on NetStream meta data
client = new Dynamic();
ns.client = client;
client.onMetaData = metaDataHandler;
}
public function playVideo(url:String)
{
urlName = new String(url);
myVideo.attachNetStream(ns);
ns.play(urlName);
ns.addEventListener(NetStatusEvent.NET_STATUS, netstat);
}
function netstat(stats:NetStatusEvent)
{
trace(stats.info.code);
}
function metaDataHandler(infoObject:Dynamic)
{
myVideo.width = infoObject.width;
myVideo.height = infoObject.height;
}
You should probably do:
client : Dynamic = {};
Forget the client object; it isn't necessary for playing FLVs or for handling async errors. For that, just add a listener to the NetStream for AsyncErrorEvent.ASYNC_ERROR.
I suggest you add a listener to the NetConnection and the NetStream for NetStatusEvent.NET_STATUS, and then trace out the event.info.code value within the listener.
You should first see the string "NetConnection.Connect.Success" coming from the NetConnection; when you play your video through the NetStream, you should see "NetStream.Play.StreamNotFound" if there's a problem loading the FLV. Otherwise you should see "NetStream.Play.Start".
Unless you're progressively streaming your FLV, you may not see any video playing until the file has finished loading. If the movie file is long, this may explain why your program is running without errors but isn't playing the movie. There are small test FLV files available online that you might wish to use while you track the problem down.
(ActionScript's FLV playback API is bizarre and haXe's documentation is rudimentary, so you're rightfully frustrated.)
This maybe useful... http://code.google.com/p/zpartan/source/browse/zpartan/media/
You can see it being used
http://code.google.com/p/jigsawx/
I want to load sound placed in sounds folder.
Code is
var my_sound = new Sound();
my_sound.loadSound("sounds/sound1.mp3");
my_sound.onLoad = function(success:boolean){
if(success){
my_sound.start();
}
}
This plays sound when flash is open and pressing CTRL+ENTER(Test Movie).
but when we plays the swf it won't play sound.
for this problem i found one solution.
i made off onLoad function. and the Test Movie. Now the opposite things happend.
It dosen't play when press CTRL+ENTER (TestMovie);
but it plays when swf is playing.
Is there any other way of loading sound.
Try:
var my_sound:Sound = new Sound();
my_sound.onLoad = function(success:Boolean)
{
if (success)
{
my_sound.stop();
}
};
my_sound.loadSound("sounds/sound1.mp3", true);
This will stop the sound as soon as it's loaded.
Whenever you want to start the sound, just call this function:
my_sound.start();