Re: [webkit-dev] Webkit MediaRecorder Timeslice functionality on Safari 14.0.2 Mojave

[youenn fablet via webkit-dev]

Hi Mark,

Thanks for reaching out.

For timeslice specific questions, it might be best to continue discussions
in https://bugs.webkit.org/show_bug.cgi?id=202233.

Timeslice support in older versions of MacOS and iOS is tricky.
On those OSes, including MacOS Mojave, MediaRecorder is not enabled by
default.

On the most recent BigSur and iOS versions, MediaRecorder should be enabled
by default and timeslice should be supported.

Hope this helps,
Y

Le lun. 1 févr. 2021 à 17:29, Gallery via webkit-dev <
webkit-dev@lists.webkit.org> a écrit :

> Hi Folks
>
> We are developing a streaming system which uses MediaRecorder with
> timeslice.
>
> It's clear that Safari only has MediaRecorder as developer experiment, and
> that older versions of Safari dont support timeslice anyway.
> However, a recent WebKit thread
> https://bugs.webkit.org/show_bug.cgi?id=202233
> Suggests that timeslice *is* implemented in Safari 14.0.2 and the author
> provided an example jsfiddle:  https://jsfiddle.net/hdwc2xzL/
>
> Our experience suggests all is not as expected:
>
> *On Big Sur (on Apple DTK)*
> *- Safari 14.02 * (with mediarecorder enabled in experimental features)
> does appear to work as expected.  MediaRecorder and timeslice all correct.
>
>
> *On macOS Mojave (on MacBook Pro intel)*
> -* Safari 13* - (with mediarecorder enabled in experimental features).
> MediaRecorder initialises OK and works as expected (but without timeslice
> callbacks)
> - *Safari 14.0.2* (with mediarecorder enabled in experimental features)
>  Throws an error when initialising MediaRecorder *"NotSupportedError: The
> MediaRecorder is unsupported on this platform”*
>
> Both our own mechanism. and the jsfiddle referenced above shows the same
> error;
> try
> {
> mediaRecorder = new MediaRecorder(window.stream, options);  *//
> options is just  {videoBitsPerSecond: 150} - hence allowing default
> mimetype, window.stream successful from getUserMedia*
> }
> catch (e)
> {
> console.error('navigator.getUserMedia error:', e);
> errorMsgElement.innerHTML = `navigator.getUserMedia error:${e.toString()}`;
>
> // fails: *"NotSupportedError: The MediaRecorder is unsupported on this
> platform”*
>
>  }
>
> so we dont even get as far as calling mediaRecorder.start(timeslice_ms)
> any more (as we did with Safari 13)
>
>
> *Could anyone explain this behaviour in Mojave ?   *
> *Should MediaRecorder work on the official shipping 14.02 downloaded on
> Mojave ?*
> *On a related note - what should we expect from mobile Safari with respect
> to timeslice MediaRecorder ?*
>
> *When might we see MediaRecorder enabled by default so we can use it for
> customer applications ???*
>
> *Many Thanks !*
>
>
>
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[webkit-dev] Webkit MediaRecorder Timeslice functionality on Safari 14.0.2 Mojave

[Gallery via webkit-dev]

Hi Folks

We are developing a streaming system which uses MediaRecorder with timeslice.

It's clear that Safari only has MediaRecorder as developer experiment, and that 
older versions of Safari dont support timeslice anyway.  
However, a recent WebKit thread https://bugs.webkit.org/show_bug.cgi?id=202233 

Suggests that timeslice *is* implemented in Safari 14.0.2 and the author 
provided an example jsfiddle:  https://jsfiddle.net/hdwc2xzL/ 


Our experience suggests all is not as expected:

On Big Sur (on Apple DTK)
- Safari 14.02  (with mediarecorder enabled in experimental features) does 
appear to work as expected.  MediaRecorder and timeslice all correct.


On macOS Mojave (on MacBook Pro intel)
- Safari 13 - (with mediarecorder enabled in experimental features).  
MediaRecorder initialises OK and works as expected (but without timeslice 
callbacks)
- Safari 14.0.2 (with mediarecorder enabled in experimental features)  Throws 
an error when initialising MediaRecorder "NotSupportedError: The MediaRecorder 
is unsupported on this platform”

Both our own mechanism. and the jsfiddle referenced above shows the same error;
try 
{
mediaRecorder = new MediaRecorder(window.stream, options);  // 
options is just  {videoBitsPerSecond: 150} - hence allowing default 
mimetype, window.stream successful from getUserMedia
}
catch (e) 
{
console.error('navigator.getUserMedia error:', e);
errorMsgElement.innerHTML = `navigator.getUserMedia 
error:${e.toString()}`;

// fails: "NotSupportedError: The MediaRecorder is unsupported on this platform”

 }

so we dont even get as far as calling mediaRecorder.start(timeslice_ms) any 
more (as we did with Safari 13)


Could anyone explain this behaviour in Mojave ?   
Should MediaRecorder work on the official shipping 14.02 downloaded on Mojave ?
On a related note - what should we expect from mobile Safari with respect to 
timeslice MediaRecorder ?

When might we see MediaRecorder enabled by default so we can use it for 
customer applications ???

Many Thanks !



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