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viveksvas

4K playback quality - Media bitrate exceeds limit

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viveksvas
Posted (edited)

One of my files in 4K, HEVC is transcoded to H264 during playback and the reason being "Media bitrate exceeds limit".

 

Source Video bitrate - 115Mb/s

Max Bitrate : Auto  - 110Mb/s

 

So I guess my lan server is not fast enough to stream 115Mb/s. Am I right?

 

So, in that case, how can I increase the max 110Mb/s value? Is it detected by Emby based on my connection? I am streaming through my Roku Ultra which is wired to my lan network. Or is it my  router that has the limitation? How do I find out where the bottleneck is? Also I have couple switches on the path that supports only 10/100 Mbps.

Edited by viveksvas

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ebr

Hi.  We chose 110 as the max because it is ridiculously high - especially for HEVC :).  What is the source of this video?  The Roku device is only rated for 35Mb/s.

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Happy2Play
Posted (edited)

Really you need to determine why it is transcoding.

 

But all h265 is converted to h264 when transcodes, and the h265 bitrate is doubled to try and maintain quality when converted to h264.  But I would say still subjective at that high of bitrate.

Edited by Happy2Play

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viveksvas
Posted (edited)

It's Lion King 4K movie trailer. :D

I have few other 4K HEVC full movies which plays just fine at around 15Mbps. I wonder why they chose to make trailer that high quality. lol

Edited by viveksvas

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viveksvas

Really you need to determine why it is transcoding.

 

But all h265 is converted to h264 when transcodes, and the h265 bitrate is doubled to try and maintain quality when converted to h264.  But I would say still subjective at that high of bitrate.

I thought my lan is severely slow and might need an upgrade or something. :o

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pwhodges

How do I find out where the bottleneck is? Also I have couple switches on the path that supports only 10/100 Mbps.

 

Are you surprised that a path including a switch that only supports 100Mbps doesn't support more?  There's surely no point in looking elsewhere when you have an identified bottleneck.  Sort that and then look again if necessary.

 

Paul

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cptlores
Posted (edited)

Hi.  We chose 110 as the max because it is ridiculously high - especially for HEVC :).  What is the source of this video?  The Roku device is only rated for 35Mb/s.

 

I am sorry, but it is not. The standard rates (not necessarily used, but what is defined in the specifications) for a Ultra HD Blu-ray disc is 72, 92, 123 and 144Mbit/sec. And yes, I know this rate is for both video and sound combined, but you get my point. 4K video has 4 times more pixels then 1080p and also often contains HDR (10/12bit colorspace), so ~100mbit is no longer as high as it sounds.

Edited by cptlores

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ebr

I am sorry, but it is not. The standard rates (not necessarily used, but what is defined in the specifications) for a Ultra HD Blu-ray disc is 72, 92, 123 and 144Mbit/sec. And yes, I know this rate is for both video and sound combined, but you get my point. 4K video has 4 times more pixels then 1080p and also often contains HDR (10/12bit colorspace), so ~100mbit is no longer as high as it sounds.

 

Yes, but none of the streaming type devices support bitrates that high so allowing you to set them higher is just asking for playback problems :).

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