Hi All, Firefox OS has a problem of camera preview's lag and jittering. It is Bug 844248. The preview's lag is very significant compared to android one.
Firefox OS uses video tag and MediaStreamGraph to render camera preview. [1] [2] shows the current configration. MediaStreamGraph is a framework for synchronized audio/video processing and adds latency and does buffering. But it causes camera preview's lag and jittering. The jittering happens because camera hw has only limited number of buffers for preview. The buffering at MediaStreamGraph starves buffers for camera preview at camera hw. Then the camera hw stops preview update intermittently. The camera preview requests no latency and no buffering at MediaStreamGraph. Are there any ideas to achieve this? Right now, I am thinking to create a custom MediaStream to bypass MediaStreamGraph processing. attachment 725478 [3] is just an ugly temporary patch. Though by applying the attachment, camera preview update becomes quick and smooth. [1] https://github.com/sotaroikeda/firefox-diagrams/blob/master/dom/dom_camera_FirefoxOS_1_1.pdf?raw=true [2] https://github.com/sotaroikeda/firefox-diagrams/blob/master/dom/dom_camera_DOMCameraPreview_FirefoxOS_1_01.pdf?raw=true [3] https://bugzilla.mozilla.org/attachment.cgi?id=725478&action=diff Thanks in advance, Sotaro _______________________________________________ dev-media mailing list [email protected] https://lists.mozilla.org/listinfo/dev-media
