Happy2Play 8252 Posted July 20, 2022 Share Posted July 20, 2022 @softworkz I am confused then as I have bitrate limit of 7.75Mbps and client on auto and this scaling 720x404 Global Remote Bitrate Limit: 7,750,000 bps >>>>>> Video Processing Steps for [0:0]: H.265 (HEVC) Step HW-Context Format SW-Format Size Next HEVC_QSV >> QSV qsv p010 3840x2160 >> vpp_qsv vpp_qsv >> QSV qsv p010 720x404 >> setparams setparams >> QSV qsv p010 720x404 >> hwmap hwmap >> OPENCL opencl p010 720x404 >> tonemap_opencl tonemap_opencl >> OPENCL opencl nv12 720x404 >> hwmap hwmap >> QSV qsv nv12 720x404 >> But setting client quality to max quality I get scaling 1920x1080 Global Remote Bitrate Limit: 7,750,000 bps >>>>>> Video Processing Steps for [0:0]: H.265 (HEVC) Step HW-Context Format SW-Format Size Next HEVC_QSV >> QSV qsv p010 3840x2160 >> vpp_qsv vpp_qsv >> QSV qsv p010 1920x1080 >> setparams setparams >> QSV qsv p010 1920x1080 >> hwmap hwmap >> OPENCL opencl p010 1920x1080 >> tonemap_opencl tonemap_opencl >> OPENCL opencl nv12 1920x1080 >> hwmap hwmap >> QSV qsv nv12 1920x1080 >> Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 20, 2022 Share Posted July 20, 2022 I've split this into a separate topic Link to comment Share on other sites More sharing options...
Happy2Play 8252 Posted July 20, 2022 Author Share Posted July 20, 2022 @softworkz Okay but per other question this does seem to apply. Quote Would applying client quality differently honor resolution but keep bitrate limit? As scaling is totally different per client quality. So I would question if SoGX changed client quality would it correct the issue? Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 20, 2022 Share Posted July 20, 2022 16 minutes ago, Happy2Play said: So I would question if SoGX changed client quality would it correct the issue? The bitrate doesn't matter, but as soon as SogX will hit the point where Emby decides not to downscale the video, the aliasing of the edges will disappear. It's like a computer game with bad antialiasing - increasing the quality doesn't help, but increasing resolution does. Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 20, 2022 Share Posted July 20, 2022 You can see from the image that I've posted that even at half of the bitrate, you get a perfect output with downscaling. (except when the encoder doesn't work properly) Link to comment Share on other sites More sharing options...
Happy2Play 8252 Posted July 20, 2022 Author Share Posted July 20, 2022 3 minutes ago, softworkz said: increasing the quality doesn't help, but increasing resolution does. Is that not what is happening above with 720x404 vs 1920x1080 Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 20, 2022 Share Posted July 20, 2022 34 minutes ago, Happy2Play said: @softworkz I am confused then as I have bitrate limit of 7.75Mbps and client on auto and this scaling 720x404 But setting client quality to max quality I get scaling 1920x1080 I can't answer that immediately - that's why I split it out. Will need to see the full case with logs. Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 20, 2022 Share Posted July 20, 2022 Just now, Happy2Play said: 5 minutes ago, softworkz said: increasing the quality doesn't help, but increasing resolution does. Is that not what is happening above with 720x404 vs 1920x1080 What I mean is: With the defective decoder you get a subjectively better result with a higher resolution, irrespectively of the bitrate setting (in the ffmpeg command line) Link to comment Share on other sites More sharing options...
Happy2Play 8252 Posted July 20, 2022 Author Share Posted July 20, 2022 2 minutes ago, softworkz said: Will need to see the full case with logs. Here are the logs in my test just looking at scaling differences when client quality changed from Auto to 1080p-8Mbs. With Global at 7.75.Mbps. ffmpeg-transcode-0eb28ac9-e212-4927-8ab1-21d8ace9a593_1.txtffmpeg-transcode-ed8bb79c-6745-4cf1-9fee-d221f79023e1_1.txt Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 21, 2022 Share Posted July 21, 2022 The client does this, when you choose "Auto": That value should actually be based on some bandwidth measurement, it was broken for a long time. Don't know the current status of it... @Luke? 1 Link to comment Share on other sites More sharing options...
Happy2Play 8252 Posted July 21, 2022 Author Share Posted July 21, 2022 So Auto is defaulting to a coded value of about 5Mbps. Retested at with a Global of 5Mbps to be in line with other topic and the client quality did not matter as they both scaled to 720x404. Changing Global to 5.5 changes to 1280X720 and 7.75 to 1920x1080 with client set to 1080p-8Mbs. So bitrate sets the scaling threshold. So the begs to question the Client Quality setting If they are not going to honored. Setting to 720p-2Mbps gets scaled to 640x360 Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 21, 2022 Share Posted July 21, 2022 7 minutes ago, Happy2Play said: So bitrate sets the scaling threshold. Yes, correct. 7 minutes ago, Happy2Play said: So the begs to question the Client Quality setting If they are not going to honored. What is honored is the bitrate part in that list. The other part (720, 1080) is more of informational nature. I know it appears odd, but no longer once you think it through: The primary and most important parameter for video streaming (non-local) is the available bandwidth This is he starting point. A well-behaving client measures the available bandwidth and tells (in Auto mode) the server about it But for the server, it's not that easy to determine which resolution to use for a given bandwidth It cannot simply go by a table (like the list of quality selections in the clients) - because there is no linear relation between bandwidth and video size height(!) The server needs to consider this: Video framerate At a given frame size, videos with a higher frame rate take a higher bandwidth Video widths The list shows only heights (720, 1080) - but what about widths? Videos can be 4:3 or cinemascope, from one to the other, it can be the double amount of pixels The source video content This is taken into account by looking at the source video bandwidth and the codec (iirc) The way how these choices are made have evolved over time based on experience The only little issue that I'm aware of is that HEVC source videos are weighed a bit too strong in the calculations What's really unfortunate though, is that the quality selection list in the clients is creating a wrong impression. Link to comment Share on other sites More sharing options...
Happy2Play 8252 Posted July 21, 2022 Author Share Posted July 21, 2022 10 minutes ago, softworkz said: What's really unfortunate though, is that the quality selection list in the clients is creating a wrong impression. Yes, I believe this is a key factor as the listed resolution is irrelevant and creates the question why am I not getting that resolution? I guess it should be documented somewhere the biterate resolution variables. ? to ? scales to 640x360 ? to 5.25Mbps scales to 720x404 5.5Mbs to 7.5Mbps scales to 1280X720 7.75Mbps to ? scales to 1920x1080 ? to ? scales to 3840x2160 Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 21, 2022 Share Posted July 21, 2022 1 minute ago, Happy2Play said: ? to ? scales to 640x360 ? to 5.25Mbps scales to 720x404 5.5Mbs to 7.5Mbps scales to 1280X720 7.75Mbps to ? scales to 1920x1080 ? to ? scales to 3840x2160 ??? I've just explained that no such kind of relation exists and why.. Link to comment Share on other sites More sharing options...
Happy2Play 8252 Posted July 21, 2022 Author Share Posted July 21, 2022 2 minutes ago, softworkz said: ??? I've just explained that no such kind of relation exists and why.. I have tested 2 to 7.75Mbps and get scaling at specific values though. So bitrate dictates scaling at least in this test. Link to comment Share on other sites More sharing options...
softworkz 3326 Posted July 21, 2022 Share Posted July 21, 2022 Compare An HEVC source file and an MPEG2Video source file (same framerate) A source file with 24fps and one with 60fps (same source codec) and see whether output scaling switches at the same thresholds. Link to comment Share on other sites More sharing options...
lightsout 144 Posted August 23, 2022 Share Posted August 23, 2022 On 7/20/2022 at 5:28 PM, softworkz said: The client does this, when you choose "Auto": That value should actually be based on some bandwidth measurement, it was broken for a long time. Don't know the current status of it... @Luke? Helpful thread, on an unrelated note what software is that in the screen shot? Link to comment Share on other sites More sharing options...
Happy2Play 8252 Posted August 23, 2022 Author Share Posted August 23, 2022 7 minutes ago, lightsout said: Helpful thread, on an unrelated note what software is that in the screen shot? It is a support tool softworkz created for troubleshooting. Link to comment Share on other sites More sharing options...
lightsout 144 Posted August 23, 2022 Share Posted August 23, 2022 Just now, Happy2Play said: It is a support tool softworkz created for troubleshooting. Ah I see thanks. Link to comment Share on other sites More sharing options...
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