963481 - [Media Recorder] Implement MediaRecorder Constrainable Properties

Status: RESOLVED DUPLICATE of bug 959490

(Core :: Audio/Video: Recording, defect)

Description

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

As Media Recorder Spec
https://dvcs.w3.org/hg/dap/raw-file/tip/media-stream-capture/MediaRecorder.html#properties

Comment 1

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

Hi Robert,
If we want let application to choose the mimeType that platform already supported. 
Is it suitable to use the constrain to pass the mimeType to encoder?
BTW, on js,
Does it look like
var mr = new MediaRecorder(stream, {mimetype:video/mp4, imageheight:1024, imagewidth:768}) or
var mr = new MediaRecorder(stream, {mimetype:audio/opus}) ?

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

According to http://dev.w3.org/2011/webrtc/editor/getusermedia.html the author would do something like this:

var mr = new MediaRecorder(stream);
mr.applyConstraints({mandatory:{MimeType:"audio/opus"}},
                    function onsuccess() { ... },
                    function onerror() { ... });
or
mr.applyConstraints({optional:{MimeType:"video/mp4"},
                     optional:{imageWidth:1024, imageHeight:768}},
                    function onsuccess() { ... },
                    function onerror() { ... });

Comment 3

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Er, I guess that's
mr.applyConstraints({optional:[{MimeType:"video/mp4"},imageWidth:1024, imageHeight:768}]},
                    function onsuccess() { ... },
                    function onerror() { ... });
I don't like using Constraints here. I posted to the mailing list about it.

Comment 4

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

Already have this capacity on bug 959490. close it.