4 ms·

I notice that the demo video stops when I switch tabs. Is this by design or by accident? Can I use JSMpeg but have it play in the background? Another thing; can

I notice that the demo video stops when I switch tabs. Is this by design or by accident? Can I use JSMpeg but have it play in the background? Another thing; can I have video controls? PS: That video has a very late nineties, early double-ohs feel to it indeed. Good choice of video :)

nacs 10y ago
Browsers (like Chrome throttle) the JS execution of background tabs drastically which would probably make the MPEG decode impossible. They probably stop the video as a workaround.
- ryanplant-au 10y ago
  Worth noting that Chrome won't throttle a tab that has audio playing.
stilldavid 10y ago
Yeah. From the docs: > pauseWhenHidden – whether to pause playback when the tab is inactive. Default true. Note that browsers usually throttle JS in inactive tabs anyway.
- tyingq 10y ago
  Supposedly, Chrome doesn't throttle background tabs where audio is playing.
  - koolba 10y ago
    JS hack idea! Play a silent sound to force Chrome to not throttle your page when it's not primary.
    - nix0n 10y ago
      Please don't. Also, Chrome puts a little speaker icon on the tab, so users might notice.
      - recursive 10y ago
        In the long run, the probability of this being exploited is approximately 100%. I'm surprised they left in such an obvious loophole.
        daurnimator 10y ago
        I'm not sure how usurping this is an 'exploit'. It's used as a heuristic to save battery life. and if you're trying to run down a user's battery I can think of better ways.
        dzhiurgis 10y ago
        Well you can mine bitcoins or run some botnets on victims computer.
        recursive 10y ago
        The goal isn't to run down the users' battery. The goal is to do whatever timer callback processing a tab is doing that got throttled in the first place.
    - Ezhik 10y ago
      Need to do some more testing, but I have suspicions that Chrome actually doesn't put the sound icon on the tab if it's playing silent audio.
      - koolba 10y ago
        Throw in an inaudible frequency once per second at a low volume. I doubt they're doing signal processing to decide if a human can actually hear the output.

nacs 10y ago

Browsers (like Chrome throttle) the JS execution of background tabs drastically which would probably make the MPEG decode impossible. They probably stop the video as a workaround.

ryanplant-au 10y ago
Worth noting that Chrome won't throttle a tab that has audio playing.

stilldavid 10y ago

Yeah. From the docs: > pauseWhenHidden – whether to pause playback when the tab is inactive. Default true. Note that browsers usually throttle JS in inactive tabs anyway.

tyingq 10y ago
Supposedly, Chrome doesn't throttle background tabs where audio is playing.
- koolba 10y ago
  JS hack idea! Play a silent sound to force Chrome to not throttle your page when it's not primary.
  - nix0n 10y ago
    Please don't. Also, Chrome puts a little speaker icon on the tab, so users might notice.
    - recursive 10y ago
      In the long run, the probability of this being exploited is approximately 100%. I'm surprised they left in such an obvious loophole.
      - daurnimator 10y ago
        I'm not sure how usurping this is an 'exploit'. It's used as a heuristic to save battery life. and if you're trying to run down a user's battery I can think of better ways.
        dzhiurgis 10y ago
        Well you can mine bitcoins or run some botnets on victims computer.
        recursive 10y ago
        The goal isn't to run down the users' battery. The goal is to do whatever timer callback processing a tab is doing that got throttled in the first place.
  - Ezhik 10y ago
    Need to do some more testing, but I have suspicions that Chrome actually doesn't put the sound icon on the tab if it's playing silent audio.
    - koolba 10y ago
      Throw in an inaudible frequency once per second at a low volume. I doubt they're doing signal processing to decide if a human can actually hear the output.