User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0 Build ID: 20160823121617 Steps to reproduce: On Windows 10 On https://www.webrtc-experiment.com/RecordRTC/ Record 1-2 mins of Audio+Video Play recording Actual results: After a few seconds audio disappears and then it appears again after some time Expected results: Audio must be available during all recording

I suspect this is the same as https://bugzilla.mozilla.org/show_bug.cgi?id=1294753 which has been resolved in FF 49 beta. There is still a different audio/video sync bug in Nightly (FF51) - https://bugzilla.mozilla.org/show_bug.cgi?id=1300169 and https://bugzilla.mozilla.org/show_bug.cgi?id=1300650

Can you please verify that (at least) this specific problem has been resolved with FF 49 beta or later. Please note that we expect to have the 2nd issue mentioned in the comment above.

To clarify - the second issue (the a/v sync issue) is only expected to exist in Nightly FF51, it doesn't seem to exist in 49 Beta or 50 Developers Preview.

Regarding audio disappears problem: Regression window: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=85a2d1e3cf9548108ec1124f001a1abe9ace1f03&tochange=59d3baba3cf01dfe9b4759bde62b694850931695 Regressed by: Bug 1215115 And fixed the audio disappears problem: Progression window: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=a2cfcd0a8f9bb765cd3a8c2047d1cdbc5abfaa83&tochange=38b376e74c6e1a1ccab3c447df3d6687b811c8b5 Fixed the audio disappears problem by : Bug 1294753 However, the 2nd problem(the a/v sync issue) exists

Nothing actionable here.

Clear the NI