| // Use WebAudio API to detect audio playback with volume | |
| // Returns early with false when audio could not be playing | |
| // Returns null if WebAudio API cannot be used while media is in a playing state | |
| function isMediaPlayingAudio(mediaElement) { | |
| if (media.paused || media.muted || media.volume === 0 || media.played.length < 1) { | |
| return false; | |
| } | |
| let analyser = media.audioAnalyser; | |
| let audioCtx = media.audioCtx; | |
| if (!analyser) { |
| #!/bin/bash | |
| # | |
| # https://github.com/terabit-software/dynamic-stream-server/blob/master/scripts/sync_test.sh | |
| # | |
| # Tool to check video and audio sync. | |
| # Loop with 1 beep per second with 4 increasing frequencies. | |
| # Can be used to measure delays up to 4 seconds. | |
| # The grid is accurate to about 1ms. | |
| # | |
| # Beep duration: 0.125s |