HD streams work fine but 4K keeps buffering — diagnosed and fixed

jake_m

jake_m

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Mar 3, 2010
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I have been using a paid streaming service for six months without problems on HD channels. Recently tried 4K content and it buffers every few minutes. My connection shows 150Mbps on a speed test. Sharing what I found and the fix.
 
Same issue here. Took me a while to figure out what was different between HD and 4K.
 
Is 4K buffering happening on all 4K channels or only some specific ones? That matters for diagnosis.
 
The key difference is bitrate. HD streams typically run 5–8 Mbps while 4K HDR streams require 15–35 Mbps sustained. Your peak speed test result does not reflect what the stream actually gets.
 
Here is how I diagnosed mine step by step:
1. Run a sustained 5-minute speed test, not a 3-second one.
2. Check the actual measured throughput, not the peak burst.
3. Switch from Wi-Fi to Ethernet and test again.
4. If Ethernet is fine but Wi-Fi is not, you have found the cause.
In my case, Wi-Fi showed 150 Mbps peak but only 18 Mbps sustained during a 5-minute test. Not enough for 4K.
 
On Ethernet, next step is checking your router's QoS settings. If another device is downloading or backing up to the cloud, it can starve the 4K stream during high-bitrate scenes. QoS should prioritize your streaming device.
 
Also worth checking: does your streaming device actually support hardware H.265 decode? 4K HDR content is nearly always H.265. Software decoding of H.265 at 4K will cause buffering even with plenty of bandwidth.
Android TV boxes with Amlogic S905X4 or newer have hardware H.265. Older boxes will struggle.
Check your box specifications before assuming it is a network issue.
 
I had this exact problem for two months. Tried everything with the network. Eventually discovered my Android TV box was software-decoding H.265 4K because the hardware decoder was disabled by default in the app settings. Enabled hardware decoding and zero buffering since.
 
Solved! The fix for me was a combination: switched to Ethernet (dropped latency) AND enabled hardware decoding in the app settings. Now 4K plays without a single stutter. Thanks everyone for the systematic approach.
 
Good resolution. Worth adding for others reading this: also check if your service's 4K streams are AV1 encoded. AV1 requires newer hardware decode support. Not all Android TV boxes handle it, even recent ones.
 
Most IPTV apps show codec information in the playback stats overlay. In TiviMate, long-press the OK button during playback and look for the video codec line. It will show H264, H265/HEVC, or AV1.
 
For anyone continuing this thread: please keep the discussion focused on technical troubleshooting. Do not post specific provider names or service URLs here. Stick to general diagnostics and this thread stays open.
 
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