What Android device ?
FYI
Current onn 4K streaming box (Google TV) does AV1. Also, rumors of a new "Pro" onn box coming soon!
Please try Alpha app for AV1 support on Android and submit diagnostics after playback.
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I am using a directv stream gemini box (not air)
not sure how to do alpha. I am already a beta tester. thanks
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Sound works but still black screen. onn 4k streaming box (2nd gen).
Channels DVR Server 4.21.2105
Channels DVR ATV 4.19.2104
Edit: Also tried on the gen1 box, same results.
Not sure if this is still an open issue for folks, but AV1 direct plays without issue on both my current gen iPad Mini and iPhone 15 Pro Max.
Probably depends if you have it set to Hardware/Software/Hybrid?
No transcoding going on if that's what you mean? I do have it set to Hardware but stats on the client are showing Direct Play.
No not transcoding. I mean under playback, advanced.
Deinterlacing Mode set to Hardware
Video and Audio Driver set to Default
Decoder Quality set to High
Just looked back on your previous posts and I see you're using an Android box - that's probably the difference.
Change from hardware to the other choice(s) and see if it will properly Direct Play.
Ya I've found playback to be goofy and hit & miss among many different file types with Hardware, Hybrid, Software, etc. Starting the file in Landscape versus Portrait mode then rotating the device. Sometimes it plays back with black screen, sometimes correct screen. Sometimes the image ratio is correct, sometimes it's not. My devices are primarily the Pixel 8 or 9 Pro and onn 4k streaming boxes.
Just did some testing on a onn 4K streaming box with AV1 file. On "Hardware" it's black screen with just sound. With both "Hybrid" and "Software" it shows the video but it's choppy/dropped frames with sound.
With Emby, it plays smooth.
I think the Apple TV is doing it on the client side - it has a fair amount of power to decode, even in software.
Ya the onn 4K streaming box, FireTV, and Pixel 8/9 all have AV1 decoding built-in which are the devices I use. All those devices Direct Play AV1 files with Emby smoothly. Channels DVR does not properly play them on the same devices which is unfortunate.
Yeah just tried on my Amazon Echo Show 15 (which runs Fire TV). Just get audio but no video.
Interestingly enough, Plex will direct play the same video.
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AV1 is becoming more and more commonplace. Hope the Channels team understands this.
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Start voting folks if you want this. The more people vote, the more devs see this as important and will most likely implement it
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Voted. Starting working on my dream virtual music videos channel, mimicking a couple of my favorite Pandora "stations". The videos I've checked so far have all been AV1 -- serious bummer. 
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