Dynamically create video (stream) with createObjectURL - javascript

I wonder if it is possible to create a html5 video on the fly. Some of you may noticed the new webrtc and its behavior with the video tag.
navigator.webkitGetUserMedia('video', gotStream, noStream);
function gotStream(stream) {
video.src = webkitURL.createObjectURL(stream);
}
what exactly is that "stream" in gotStream(stream) what is that "interface" looks like so i can generate one of my own? May it be by computing things or by just receiving data from server to display the video. Secound how do i get the data out of this "stream"? So i can read it from one users webcam to send it to my server and let it pass through the receiving user. Binary data transmission is no topic of my question, i already have this working.
I just need the data from the "stream" from one user and reconstruct that "stream" on the target user who wanna see user ones webcam.
Any further information on "where to get these infos by my self" (API Docu sort of) would be also very helpful, cuz i cant find any.
I am aware of the PeerConnection stuff, so no need to mention it here. Cuz beside that webcam stuff i would love to pipe dynamically generated videos from my server to the client or make some sort of video transmitting over dynamic changeable bandwidth with ffmpeg etc. but for this i need to pipe that data to that video element

You may want to look at Whammy: http://antimatter15.com/wp/2012/08/whammy-a-real-time-javascript-webm-encoder/.
For now, you can periodically copy a video element screen to a canvas, then save that canvas to build a video. Whammy ties together webp images generated from a canvas into a webm file, taking advantage of the similarities of the webp (image) and webm (video) format.
You could generate other images and stitch them together in the same manner. Note that this does not support audio.

Related

Azure Media Service upload file directly from webcam

I have looked at the documentation for Azure Media Services, but I could not find any docs or samples that talk about uploading a video from a browser using the webcam.
I am already using MediaRecorder api in the browser to record the webcam video and then upload... but I was wondering if there was a better alternative than 'MediaRecorder'?
Since Microsoft already provides a media player to play the videos, I was wondering if in a similar way, Microsoft maybe had a js library to do the video recording on the frontend and upload accordingly?
Edit: My intent is not to live stream from the browser, but to upload the file to AMS and play in the Azure media player at a later time.
EDIT:
Originally answered this thinking you meant live... But I see now you meant on-demand recorded files. I will leave the live section below.
On-Demand:
For the on-demand scenario, you should also be able to use the Media Recorder API to save the asset into local storage.
There are some good examples of doing that recording to storage out there, but the main API doc is here and has some guidance on how to save the output. The output could be WebM or MP4 depending on browser capabilities.
https://developer.mozilla.org/en-US/docs/Web/API/MediaStream_Recording_API
Once you have a local file, the steps to get that into AMS would be:
Create an Asset
Get the container name from the new Asset (we generate one for you, or you can pass the name of the container into the Asset create call)
Use the Azure Blob storage SDK to get a writeable SAS locator to upload the file into the container.
Useful example code:
Example of creating an Asset with a specific Blob container name
Previous Stack thread on uploading from browser to blob storage container
Azure Storage Javascript client samples
// If one file has been selected in the HTML file input element
var file = document.getElementById('fileinput').files[0];
var customBlockSize = file.size > 1024 * 1024 * 32 ? 1024 * 1024 * 4 : 1024 * 512;
blobService.singleBlobPutThresholdInBytes = customBlockSize;
var finishedOrError = false;
var speedSummary = blobService.createBlockBlobFromBrowserFile('mycontainer', file.name, file, {blockSize : customBlockSize}, function(error, result, response) {
finishedOrError = true;
if (error) {
// Upload blob failed
} else {
// Upload successfully
}
});
refreshProgress();
Disclaimer from me...
Have not tried the above scenario at all myself. Just finding the right resources for you to check. Hope that helps!
But, the below scenario I have done for live, and it does work..
Live Scenario:
It's tricky, because Media Services only supports RTMP ingest.
Media Recorder API just records to "slices" of webM or MP4 content in the browser. You have to then push those chunks of media someplace that is capable of sending that content into AMS as RTMP/S. Otherwise, no go.
There is a good example project from Mux up here called Wocket that demonstrates how you could go about building a solution that ingests content from the MediaRecorder API and send it to any RTMP server, but it has to go over a WebSocket connection to a middle tier Docker container that is running FFMPEG. The FFMPEG process receives the webM or MP4 chunks from the Media Recorder and forwards that onto Media Services.
https://github.com/MuxLabs/wocket
I built a demo recently that uses this in Azure, and it surprisingly works... but not really production ready solution - has lots of issues on iOS for example. Also, I had to move the Canvas drawing off the requestAnimationFrame timer and use worker-timers (node.js npm packager) to move the canvas drawing to a web worker. That way I could at least switch focus from different browser tabs or hide the browser without it stopping the webcam. Normally timers like setInterval or setTimeout in the browser will sleep or be throttled in modern browsers to save power and CPU.
Let me know if you want any more details after looking at the Wocket project.

Is it possible to create an audio file based on CSV-data and an existing audio file?

I am working on a project in JavaScript, and I need to do a fairly strange task. I am not sure how to achieve it. I have looked into the most popular libraries for audio, but it doesn't seem to be an easy way to just export a created file fast, without recording it in real-time. I might be wrong.
I am going to have some data as JSON or in CSV format with numbers in each row. That number corresponds to seconds elapsed. This data tells me when a certain audio file needs to be played. The audio file is just a 5-second long clip of beeps.
I need to generate a long audio file that is just silent, but where the audio clip plays when "instructed" by the data. So it could play at 10 seconds, 45 seconds, 267 seconds, etc.
The finished audio file could be over an hour long. I was hoping to create a system where I could just select an audio file and a data file from my computer, click a button, let it process, and then download the finished file.
I hope what I want to do is not unclear. Can I use the Web Audio API for this, or do I need a library? I am stuck at the first part of the process, namely what to use and how to "create" a file from nothing.
I think you could try MediaRecorder from MediaStream Recording API - it will let you create a recording function (something like this):
const stream = navigator.mediaDevices.getUserMedia({ audio: true });
const mediaRecorder = new MediaRecorder(stream);
// then you can get your number from JSON / CSV file and do next
mediaRecorder.start();
await sleep(YOUR_NUMBER_FROM_FILE);
mediaRecorder.stop();
The example above just creates audio that will be last concrete seconds.
You can load your existing files of audio and try it play in the background. I suppose MediaRecorder will record them too.
See MDN Web Docs about MediaRecorder
To summarize - Web Audio API and MediaStream Recording API will be enough for your case.
I hope this will help you in some ways.

How to delete part of media recorder?

I'm using get user media & media recorder api to record users video.
I would like to create a button to clear the last part of the recorded stream since he paused the recording.
I didn't find anyway to do that!
If someones has an idea it would be really helpful !!
PS: if you want an example try TikTok delete option when you pose the recording
MediaRecorder delivers its coded output to the ondataavailable event handler you provide. Unfortunately that data is delivered to your event handler as Blob objects.
You can extract the Blob data into an ArrayBuffer with a variety of methods. But then you'll have to cope with the ebml / matroska / webm boxing format, not to mention the difference between key frames and delta frames in the video stream, and similar sample-buffer boundary issues in the audio stream(s).
What you want to do is going to be difficult-to-impossible in a pure HTML5 / Javascript implementation.

getByteTimeDomainData while audio is paused?

I'm working with the first example on Visualizations with Web Audio API.
My goal is to use a slider to see the waveform at different times without playing the audio.
However, it seems that the audio must be playing in order for analyser.getByteTimeDomainData(dataArray) to get the data at the current time. I set the audioElement.currentTime, but while paused, analyser.getByteTimeDomainData(dataArray) just returns [128, 128, ..., 128].
I'd just like to get the data for a specific time while the audio is paused. Is that possible?
getByteTimeDomainData is used for real-time audio analysis, in order to generate waveform without playing you need to decode the entire audio file using audio context method decodeAudioData and get audio data (Float32Array) from the decoded audio buffer using the getChannelData method which you would process to get probably average sample value for each canvas pixel and render it.
Yes, the audio context must be running for the data to change in an AnalyserNode. I can't think of any other way with WebAudio.

Load large video file in HTML

Here is my problem : I want to play a large video file (3.6Gb) stored in a S3 bucket, but it seems the file is too big and the page crash after 30sec of loading.
This is my code to play the video :
var video = document.getElementById("video");
const mediaSource = new MediaSource();
video.src = URL.createObjectURL(mediaSource);
mediaSource.addEventListener('sourceopen', sourceOpen, { once: true });
function sourceOpen() {
URL.revokeObjectURL(video.src);
const sourceBuffer = mediaSource.addSourceBuffer('video/mp4; codecs="avc1.f40028"');
fetch('URL_TO_VIDEO_IN_S3')
.then(response => response.arrayBuffer())
.then(data => {
// Append the data into the new sourceBuffer.
sourceBuffer.appendBuffer(data);
})
.catch(error => {
});
}
I saw that blob URL could be a solution but it didn't work well with my URL.
Take my answer with a grain of salt as I am no expert. However, I am working on something very similar at the moment.
I suspect your issue is that you're attempting to load the entire resource (video file) into the browser at once. An object URL for a file size that exceeds a gigabyte is extremely large.
What you need to do is use the readable stream from the body of your fetch request to process the video file chunk-by-chunk. So as long as you aren't confined to working in the safari browser, you should be to use both the Readable and Writeable Stream classes natively in the browser.
These two classes allow you to form what's called a pipe. In this case, you are "piping" data from the readable stream in your fetch request to a writable stream that you create which is then used as the underlying source of data for your media source extension and it's respective source buffers.
A stream pipe is very special in that it exhibits what's called backpressure. You should definitely look this term up, and read about what it means. In this case, it means the browser will not request more data once it has enough to meet its needs for video playback, the exact amount it can hold at once is specified by you the programmer through something called a "highwater mark" (you should also read about this).
This allows you to control when and how much data the browser is requesting from your (on going) fetch request.
NOTE: When you use .then(response => response.arrayBuffer()) you are telling the browser to wait for the entire resource to come back and then turn the response into an array buffer.
OPTION 1
Use CloudFront to create RTMP distribution to these resources.
It will distribute your video in streaming way.
Create an RTMP distribution to speed up distribution of your streaming media files using Adobe Flash Media Server's RTMP protocol.
Please note that HTML5 does not support RTMP format by default (without flash).
Check here for options
JWPlayer supports RTMP playback using flash. SO Question
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OPTION 2
Use Elastic Transcoder to create HLS video (.m3u8 format). Again same JWPlayer can handle it in ease.
Also it's mostly supported in native HTML5. Check compatibility with H.264

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