Also what if I get a roku stick with no external sound out, will I be forced to use the vava speakers which while not bad are not going to win any awards. But this cannot last as I can then not use the other HDMIs without manually switching the audio cable. Sound cable to sound bar from Android tv and hdmi to projector is fine no synch issues. Optical cable from vava to sound bar = bad sound synch. If you're happy with no surround sound, switch to Stereo/PCM on the Firestick or other device.Recently got my Vava 4k and really enjoying it.Ī few things come up after a bit of use, most annoying is the audio lag when I send the sound to external sound bar. Upgrade your TV etc to one that supports HDMI 2.1, which has a 48Gbps rather than the HDMI 2.0 18Gbps standard. no delay for Standard/StereoPCM and delay for HDR content. Amazon could create a change to the AV Sync app, to change the delay based on what the "Adaptive" "Dynamic Range Settings" are doing. My HDMI 2.0 TV does seem to have this issue for sure though. I cant speak to if there are other audio delays on HDMI 2.1 equipment, there could be delays introduced elsewhere in the audio processing that setting all content to Always HDR *may* resolve, by keeping a consistent amount of data always flowing. If you set ALL display output to "Always HDR" then even NON-HDR will be sent out as the HDR standard, so it always consumes the same amount of bandwidth, therefore always requiring the same audio delay (about 4x dots away from the right side end of the AV-Sync firestick app.in my tests at least). The image " Standard VS HDR" switching can alter the available bandwidth for audio, causing what I will describe as a race/slowdown/sync variability issue. The issue comes in when you use a Dolby Digital 5.1 or greater standard. Apps like Youtube or where the content isn't HDR, will switch to a standard image, using LESS of the HDMI 2.0 bandwidth. So a film on Netflix/Prime/Disney etc will typically play as HDR content (if your TV supports its etc) utilizing MORE of the HDMI 2.0 bandwidth. When a firestick "Dynamic Range Settings" is on "Adaptive" it switches the image between Standard and HDR as it feels necessary. So all of a sudden the audio is therefore out of sync again and you have to re-adjust it for that app, or you just think your firestick/sound system is rubbish and give up on Dolby 5.1 or greater.ĮXPLANATION (as simple as I can put it here) The reason being, NON-HDR content and Stereo (or PCM) requires less bandwidth, as such there is no delay with ALL the image and audio data arriving on time at the TV. The audio is 1-2 seconds ahead of the on screen image. All of a sudden the AV Sync is all wrong again. You go to the Youtube app or something that is a NON-HDR image OR just uses standard stereo/PCM. Because of the bandwidth limitation you need to change the AV Audio sync so the audio arrives before the image. You play a film that is HDR and Dolby Surround on a TV system that *IS* HDMI 2.0 standard (18Gbps max). This will keep the audio sync standardized across all apps on the firestick and sound bars or amplifiers linked to the firestick. **TLDR** change the firestick "Dynamic Range Settings" to "Always HDR", rather than "Adaptive". I also tried optical from the TV to the soundbar and the same issue occurred. My setup is Firestick 4k plugged into > TV > Soundbar (HDMI ARC connection ) I found what appears to be a permanent fix! I've seen other posts on this forum and wonder if others have this issue too, so thought Id post. In my case, I struggled with a Firestick 4k and the audio sync settings required, changing from one type of media to another. I have to say, I don't believe this is a Samsung issue specifically, but perhaps all devices that may use HDR over HDMI 2.0 (not HDMI 2.1). The AV sync, although set in the firestick settings, would change between different media. I'm using a Samsung sound bar with a TV and a firestick and have all sorts of audio sync issues when using Dolby digital output.
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