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.

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.

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

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.

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