HTML5 Syncer

Allows synchronisation of 2 HTML5 video and audio streams even on different tabs. Just click the popup to scan each page and press the "Sync" button to generate sync buttons next to the video/audio, then click them (preferably when both are paused at the right times) to synchronise. Press the "Flush" button to remove synchronisation.

The streams will pause, play, change playback rate and seek together.

You can check the Developer tools console for information.

N.B. You may have to go to "chrome://extensions/" and click the reload icon for this extension if the delay does not show up on the green sync button.

Changes: 15/01/2023 - More efficient code used when finding streams. 05/01/2023 - Faster code used when finding streams. 26/10/2022 - Improved element handling (e.g. searching for tags). 15/06/2021 - Handles streams waiting for data better. 18/05/2021 - Fixed issue where the delay could be written on the wrong button; made the buttons appear below audio tags if there is space at the bottom of the page. 16/05/2021 - Removed global variables from background script; improved message passing to tabs.