I have 4 versions of a video and they're hosted on the server like this:
/1920x1080.mp4
/1280x720.mp4
/640x480.mp4
/426x240.mp4
The videos are using the HTTP 206 partial content for streaming.
I want to make so that you can change the video quality from a small menu bellow like on youtube or twitch without the player having to reload or change the video source.
Is this possible with HTML5 video if it is how?
Also please answer if there are other ways to achieve this.
I want to make so that you can change the video quality from a small
menu bellow like on youtube or twitch without the player having to
reload or change the video source. Is this possible with HTML5 video
if it is how?
Yes, Its is possible with mp4, but extremely complex, and beyond the scope of what I can explain here, especially if the keyframes are not aligned.
So how does YouTube ad twitch do it? They dont use mp4s. The use segmented streaming protocols such as DASH or HLS, then use a player that supports changing resolution like hls.js or video.js.
Related
Background:
I'm working on a video project with 50+ short videos (10min, 720p) that I want to present online. My current architecture is to placing 16 video tags in a 4x4 grid, and then randomly setting their source on load using JavaScript, and on click zooming a video to cover the full screen until clicked again.
The problem:
Each video in 720p webm is around 80mb. With 16 videos that is 1.3GB totally, or 130MB per minute, or 2MB per second. Which is a ridiculous amount of data, I think, maybe I'm wrong. The each video is so big (80mb) is to support the zoom-full-screen feature.
My idea for a solution:
Each video in two resolutions, and use the low resolution for the grid layout, and the higher resolution on the click-to-zoom.
My question: How to make this smooth? Can I preload the high resolution video on click in the background at the position of the low resolution video? And make the shift in the CSS transform? Or is there a better way to do this?
Secondary question: How to host this online? Can I put the videos on vimeo maybe? Right now I'm using wordpress.com hosting.
The normal way to achieve something like that is to encode the video using an adaptive bitrate format. The two primary formats for that would either be HLS or MPEG-DASH. Most online encoding platforms can provide those as outputs. Normally you would encode 5-6 different qualities (this helps with users that are on wifi, where bandwidth might constantly be changing) but you could easily encode it in just two different qualities.
Normally the players would be able to select the right quality automatically, but you can manage that yourself if you want.
If you are going to use HLS, you can use hls.js and its Quality Switch API. For MPEG-DASH, a good player to use would be Shaka Player and then set it like this:
player.configure({enableAdaption: false});
player.selectVideoTrack(trackId);
If you want to switch specifically on fullscreen, just listen for the fullscreen events on the players.
I am building a small app that allows to add css3 filters like grayscale in a video and download it. The video won't be longer than 6 seconds. So, I am first loading the video in the canvas and then applying the filter that user demands. Now I want user to be able to download the filtered video. The canvas.toDataURL() is only meant for images. Is there any high level canvas api to achieve this?
Thank you
Not that I know of. I think this is something that should be done server-side. Either send the raw video to the server and tell it what filters were applied so you can re-create the effect on the server OR use the solution proposed here capturing html5 canvas output as video or swf or png sequence? (hint: it's also server side)
I am using the Vimeo Developer API and I'm having difficulty adjusting the player size. Ideally I would like to scale the player down in size. If you visit crossborders.tv/client/frisbie and go to the Work section you can see what I'm talking about.
Unfortunately I don't have a solution to your problem, and if you don't get the help from here I would suggest you to use Video's own forum for your question:
API Forum on Vimeo
I found this link to a page here on StackOverflow about "Creating Audio using Javascript in <audio>", and this page on how to play audio on multiple channels. I found that the iPhone supports the audio tag and the Audio object in Javascript to play single channel audio, but is there a way to play audio on multiple channels?
Maybe I'm over complicating this, so this is what I'm trying to do. I want a way to make a graceful audio player in Javascript that supports transitioning from one audio file to another. The way I was going to implement this is to incrementally reduce the volume on one channel while incrementally increasing the volume on the other channel so I'd get a kind of fade effect. Is there a simpler solution to this using only Javascript? I guess another solution would be to reduce the volume to a certain point, start the new audio file on the same channel, then increase the volume again. This circumvents the need for fading, but I would like to fade if at all possible.
Is this possible? I know the HTML5 spec isn't finished yet, but is there some kind of workaround that you know of? Do any of you have ideas for another approach?
From what I can tell from this post about playing audio in the Android browser, this isn't supported yet, but do any of you know if it will support multiple channel audio once the audio tag is supported? Does opera mini support this?
This is an old question I know :).
iOS Safari does not support multiple audio objects playing at the same time. Also, it is not possible for having a fade-in/out effect for iOS, as the only way to change the volume setting is from the hardware itself. Apple decided to give this ability only to the device user. Volume setting is not writable by javascript. It is not even readable (always returns 1).
You can check out the Safari documentation for iOS for more info.
For Android, to be honest I have no idea.
There's no direct way that I know of to have multiple channels on an audio tag, but check out this blog post on using multiple audio tags to simulate multiple channels. http://www.storiesinflight.com/html5/audio.html
I know this is a total hack but try this trick I came up with...
Go to the page below and type on the home row keys to play a blues riff (type multiple keys at the same time etc.)
http://davealger.com/jthump/
The way this works is to create invisible <iframe> components that play a sound before destroying the frame.
I know it is a total hack and I look forward to better HTML 5 multi-channel audio support in the future.
For people that have experience with the Youtube Javascript API, I was wondering would it be possible to create a completely customized audio player using the API. My objective is to simply use the API to play sound from a embed youtube video, pause, change volume, from javascript buttons, without ever displaying the flash object itself. Does the API allow this?
Yes. Take a look at this: http://code.google.com/apis/youtube/js_example_1.html
You'll see that you can have full range of control. If you do not want to display the flash object, set the width and height equal to zero.