MBSki 1020 Posted January 21, 2021 Share Posted January 21, 2021 I just installed a new RTX Quadro 4000 in preparation for HDR tonemapping to hopefully arrive soon. In doing some tests, I was surprised to see that I can't currently play back a 4k movie on a 1080p display. I know HDR tonemapping isn't enabled yet, but shouldn't the RTX card be able to handle a 4k transcode? I can't believe the card is maxing out and not even able to play the movie. Link to comment Share on other sites More sharing options...
Luke 37093 Posted January 21, 2021 Share Posted January 21, 2021 Hi there, what happens when you try to play it? Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 1 minute ago, Luke said: Hi there, what happens when you try to play it? It plays for a few seconds and then just stops. It still holds onto the GPU, but it doesn't play. Link to comment Share on other sites More sharing options...
Luke 37093 Posted January 21, 2021 Share Posted January 21, 2021 Ok we'd have to look at an example: Thanks. Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 3 minutes ago, Luke said: Ok we'd have to look at an example: Thanks. Ok, I'll submit logs. @pir8radio Do you have similar issues when transcoding 4k videos in Emby using HW acceleration? The movie I tested 2as the last Harry Potter (deathly hallows part 2). I'll test a few more. Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 @Luke I tested a few more movies. the first few played back ok, but the last one, which is the same movie I tried before, stopped playing after a few seconds. On all movies, the GPU was maxed out. I'll PM the logs to you now. Link to comment Share on other sites More sharing options...
Luke 37093 Posted January 21, 2021 Share Posted January 21, 2021 You're getting fast enough performance. If you go into server transcoding settings and change the hardware transcoding option to Advanced, what options do you have for hevc decoders? Can you show a screenshot? Thanks. Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 4 hours ago, Luke said: You're getting fast enough performance. If you go into server transcoding settings and change the hardware transcoding option to Advanced, what options do you have for hevc decoders? Can you show a screenshot? Thanks. Here you go. But why does it max out? Even if it is working, why is it maxing out a Quadro RTX GPU? That seems rather extreme when the card is supposed to handle a dozen transcodes at the same time. Link to comment Share on other sites More sharing options...
Carlo 4330 Posted January 21, 2021 Share Posted January 21, 2021 As a test could you enable the NVDEC.Ex and move it to top spot and give it another try. If this doesn't improve anything you can easily put it back to how it's shown. You can also test changing the "Enable throttling" setting but only make one change at a time when testing! Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 32 minutes ago, cayars said: As a test could you enable the NVDEC.Ex and move it to top spot and give it another try. If this doesn't improve anything you can easily put it back to how it's shown. You can also test changing the "Enable throttling" setting but only make one change at a time when testing! I tested both and got the same result. So, 2 issues: GPU maxes out on every movie I've tested. Certain movies stop playing after a few seconds. Any other thoughts on why these issues are occurring? Link to comment Share on other sites More sharing options...
Carlo 4330 Posted January 21, 2021 Share Posted January 21, 2021 What do you have currently set for the throttle settings? If NOT enabled the GPU will do it's best to transcode the whole video as fast as possible and this of course will try to use all resources available to finish as fast as possible. If ENABLED then the GPU will get used in spurts. GPU will get used to transcode enough video to get ahead of the client then will throttle/rest until more data is needed by the client. If you only have an issue with certain movies it could be a number of things we'll have to try and identify. If you know how the best thing to try first would be to remux the file in case there are bad headers in the file. We'll need screen shots from the detail screen (bottom) of problem movies along with ffmpeg logs generated during playback to analyze what's going on. Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 6 minutes ago, cayars said: If ENABLED then the GPU will get used in spurts. GPU will get used to transcode enough video to get ahead of the client then will throttle/rest until more data is needed by the client. I tried it as enabled and the one movie I tried maxed the GPU and stopped playing. 7 minutes ago, cayars said: If you only have an issue with certain movies it could be a number of things we'll have to try and identify. If you know how the best thing to try first would be to remux the file in case there are bad headers in the file. We'll need screen shots from the detail screen (bottom) of problem movies along with ffmpeg logs generated during playback to analyze what's going on. I PM'd the logs to Luke, I'll PM them to you now too. Link to comment Share on other sites More sharing options...
Carlo 4330 Posted January 21, 2021 Share Posted January 21, 2021 These appear to be problems with the files. I'll give an example from one of the files. Harry Potter and the Goblet of Fire (2005) is kicking out lots of errors: 22:44:49.837 [matroska,webm @ 000001b97ce616c0] File ended prematurely at pos. 222732 (0x3660c) 22:44:49.879 [matroska,webm @ 000001b97ce616c0] Could not find codec parameters for stream 12 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size 22:44:58.265 [segment @ 000001b97d4db800] Non-monotonous DTS in output stream 0:1; previous: 3431893, current: 3425503; changing to 3431894. This may result in incorrect timestamps in the output file. 22:44:58.406 [matroska,webm @ 000001b97ce616c0] Element at 0xa22db68 ending at 0xa25dab2 exceeds containing master element ending at 0xa234428 and so on. These errors repeat all though the transcode and likely can't be cleaned up enough and this trips up the players. I don't know if a remux will fix these but it's worth a try. These are of course 4K HDR files and will look washed out when transcoding since you loose the HDR. We're in the process of adding tone mapping to Emby but it's always going to be better to only play 4K media back when it can be direct played and to have an alternate 1080 version as well. Tone mapping a 4K file to SDR will never equal the quality a movie studio can do when they can adjust things frame by frame as needed. Link to comment Share on other sites More sharing options...
Luke 37093 Posted January 21, 2021 Share Posted January 21, 2021 6 hours ago, mbarylski said: Here you go. But why does it max out? Even if it is working, why is it maxing out a Quadro RTX GPU? That seems rather extreme when the card is supposed to handle a dozen transcodes at the same time. Try unchecking the top decoder and checking the bottom one and see if that helps. Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 12 minutes ago, Luke said: Try unchecking the top decoder and checking the bottom one and see if that helps. I did that and it didn't work. it's the AVC encoder that appears to be the problem. If I uncheck that, it works. Carlo says I've got errors in my files and the only fix is cleaning them up. Copies from MakeMKV have worked for me for a long time so I don't quite understand why they won't work when transcoding. Is there anything that can be done with that AVC encoder to get it to work? Link to comment Share on other sites More sharing options...
GWTPqZp6b 41 Posted January 21, 2021 Share Posted January 21, 2021 (edited) I’d try some demo files which are known to be problem free, there are various bitrates available on the jellyfin site I’ve used for testing before. I very much doubt your GPU is maxing out with one stream, the RTX4000 will handle many easily. Try installing nvtop to see some perf data too. my guess is a corrupt stream as GPU transcoding is more susceptible to errors and flaws in my experience so good to rule that out first. edit. Added link https://jell.yfish.us Edited January 21, 2021 by GWTPqZp6b Link to comment Share on other sites More sharing options...
Carlo 4330 Posted January 21, 2021 Share Posted January 21, 2021 3 hours ago, mbarylski said: Carlo says I've got errors in my files and the only fix is cleaning them up. I'm saying I'm seeing lots of errors in the ffmpeg log files and I would try to remux the files since this is a quick test. GPU transcoding is not as forgiving as CPU transcoding is. The remux may not help but we won't know this until it's tried. We can also compare the log from before the mux with one after for differences as well. Link to comment Share on other sites More sharing options...
rbjtech 4283 Posted January 21, 2021 Share Posted January 21, 2021 Turn off GPU transcoding - play the file with CPU transcoding - if that works, then the issue is with the GPU transcoding, not the file ... Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 14 minutes ago, rbjtech said: Turn off GPU transcoding - play the file with CPU transcoding - if that works, then the issue is with the GPU transcoding, not the file ... That's my thought, and yes, it does work with CPU transcoding. It actually works with just the AVC encoder unchecked. But, Carlo says it's all about errors in the file. So, what am I supposed to do? Kinda stuck. I'd think the card would be able to transcode a file coming from MakeMKV, but apparently not. Link to comment Share on other sites More sharing options...
rbjtech 4283 Posted January 21, 2021 Share Posted January 21, 2021 Did you try 4K files from other sources - are they ok via the GPU transcode ? If yes, then there might be an incompatibility issues with the way MakeMKV is muxing the file - which is why Carlo said to try demuxing it (into it's .h265 and audio parts) and then remuxing it back using another tool (mkvtoolnix for example). Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 18 minutes ago, rbjtech said: Did you try 4K files from other sources - are they ok via the GPU transcode ? If yes, then there might be an incompatibility issues with the way MakeMKV is muxing the file - which is why Carlo said to try demuxing it (into it's .h265 and audio parts) and then remuxing it back using another tool (mkvtoolnix for example). Practically everything I get is from MakeMKV, so if those files don't work then for me at least, the card is a bust. Someone else suggested testing these, so I'll give these a shot. I imagine they'll work, but if the MakeMKV files don't work ... well ... that's a huge disappointment. Link to comment Share on other sites More sharing options...
Carlo 4330 Posted January 21, 2021 Share Posted January 21, 2021 Well we honestly don't know yet without the remux test so it's just speculation based on the errors seen in the logs. But when you see things like "Queue input is backward in time", "Element at 0x1393816e ending at 0x1393c833 exceeds containing master element ending at 0x1393adac", "Non-monotonous DTS in output stream 0:1; previous: 6216313, current: 6128353; changing to 6216314. This may result in incorrect timestamps in the output file." and many other timings related errors it begs a remux test to see if it helps fix the problem before diving in farther. So I'm surely not saying this is the problem but want to try and rule it out with the remux test. At least see what errors change in the log with the remux. I do want to ask a general question however since this is a HDR file being transcoded. When it was playing after being transcoded were you OK with the colors? Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 21, 2021 Author Share Posted January 21, 2021 (edited) 48 minutes ago, cayars said: When it was playing after being transcoded were you OK with the colors? Yes, actually which is a bit odd considering I'm not running a version of Emby with HDR to SDR tonemapping. I'll run again with some more colorful scenes to see how it is. I'll try to remux too. Edited January 21, 2021 by mbarylski Link to comment Share on other sites More sharing options...
MBSki 1020 Posted January 22, 2021 Author Share Posted January 22, 2021 @cayars Well, I tried a few files on the Jellyfish Bitrate Test Files site and those froze too. I'll PM you the transcode log. Link to comment Share on other sites More sharing options...
Carlo 4330 Posted January 22, 2021 Share Posted January 22, 2021 Looked at the logs from the JF files and they looked clean with no errors. When you say froze it just stops playing or are you doing any ff/rw type things? What clients have you tested in? Link to comment Share on other sites More sharing options...
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