1292454 - Webcam Stream + asm.js behavior changed in FF v47 (only on Mac)

Status: UNCONFIRMED

(Core :: Graphics, defect, P3)

Description

[marcel.klammer]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36

Steps to reproduce:

Emscripten compiled Face Tracking library: BRF.

Works fine in FF (Mac) v46.0.1 and below.
Works fine in FF (Win)
Works fine in FF (Linux) up until Nightly.

Works fine in FF (Mac) up until Nightly, when providing an image as input to track.

Does not work in FF (Mac) from 47.0b1 when having webcam stream as input.

Links to reproduce:

Image as input:
https://tmp5258.s3.amazonaws.com/brf/v3.1/image/ImageFaceTrackingNew.html (click on each eyes to start the tracking, click again to switch image)

Webcam as input:
https://tmp5258.s3.amazonaws.com/brf/v3.1/basic/BasicFaceTracking.html
https://tmp5258.s3.amazonaws.com/brf/v3.1/basic/BasicFaceDetection.html


Actual results:

BRF compiles to asm code in FF, but the webcam input stream is faulty and so the lib doesn't work properly.

So my guess: Something changed in the handling of the webcam pixel buffer in FF (Mac) v47.0b1. Maybe a faulty type (int instead of float/double somewhere). Images do work, Webcams on Mac don't.


Expected results:

Same behavior as in FF on Windows and Linux.

Comment 1

[marcel.klammer]

Created a more minimal example (Webcam needed):

Please open it in FF on Mac (v47 or higher)
https://tmp5258.s3.amazonaws.com/brf/ffbug/ff_mac_test/index_not_working.html
https://tmp5258.s3.amazonaws.com/brf/ffbug/ff_mac_test/index_working.html

The only difference between the two is the order of drawImage and getImageData:

// working
gui.video.drawImage(config.input, ... );
brfManager.update(brfBmdContext.getImageData( ... ).data);

versus:

// not working
brfManager.update(brfBmdContext.getImageData( ... ).data);
gui.video.drawImage(config.input, ... );

where 

config.input is a video playing the webcam stream
brfBmdContext is a context of a canvas and
gui.video is another canvas.

brfManager.update is a function that calls asm.js compiled code.

Comment 2

[Jerry Shih[:jerry] (UTC+8) (inactive)]

Hi Munro,
Is there any change for the video stream?

Comment 3

[Munro Mengjue Chiang [:mchiang] Be Mozillian since 1/19/2018]

https://tmp5258.s3.amazonaws.com/brf/ffbug/ff_mac_test/index_not_working.html
https://tmp5258.s3.amazonaws.com/brf/ffbug/ff_mac_test/index_working.html

Both samples work on my mbp with the latest nightly build.

Comment 4

[marcel.klammer]

Just updated Firefox Nightly from

51.0a1 (2016-08-04) to
51.0a1 (2016-08-24)

The bug seems to be gone in the new version. 

Will check in upcoming versions as well.
Thanks for the fix.

Best Regards
Marcel

Comment 5

[noiacam]

Tengo una webcam con el mismo error<a href="http://verchicaswebcam.com/porno/">.</a>
Como se solucionó el problema?

Comment 6

[noiacam]

perdonnnnn
No quise linkar
Me sale automatico

regards

http://verchicaswebcam.com/porno/