AppleTV4K direct plays VC1 codecs and stutters

Server Version#: 1.28.0.5999 on MacMini (mid2014)
Player Version#: 8.3 (2621) on model A2169 (64GB)

The AppleTV direct plays files with the VC1 codec and stutters. The audio has no problems, it is only the video that stutters. I have tested this with multiple files. All files are uncompressed BD rips.

When I turn on the setting “Use Old Video Player”, it will transcode the file and play without issue. It seems that the new player should be telling the server to transcode the file, but it isn’t doing it.

Cam you provide the Apple TV logs after reproducing the problem. Also provide the xml info for the video?

I just tried a 20 Mbps 1080p VC1 video with DTS audio and it played fine for me.

I had to watch about 9-10 minutes of the video before the issue started. This is similar with the other VC1 codec files I’ve experienced it with.

Please let me know if these are the files you’re looking for. The forum wouldn’t let me upload the XML with an xml extension, so I had to change it to TXT.

7780.txt (29.5 KB)

com.plexapp.plex 2022-07-29–16-15-41-748.log (826.0 KB)

2022/07/29 20:05:42.846 (701 MB) (4413963) :warning: PMKMPVClient.m:496 | [cplayer] warn:
2022/07/29 20:05:42.846 (701 MB) (4413963) :warning: PMKMPVClient.m:496 | [cplayer] warn: Audio/Video desynchronisation detected! Possible reasons include too slow
2022/07/29 20:05:42.846 (702 MB) (4413963) :warning: PMKMPVClient.m:496 | [cplayer] warn: hardware, temporary CPU spikes, broken drivers, and broken files. Audio
2022/07/29 20:05:42.846 (702 MB) (4413963) :warning: PMKMPVClient.m:496 | [cplayer] warn: position will not match to the video (see A-V status field).
2022/07/29 20:05:42.846 (702 MB) (4413963) :warning: PMKMPVClient.m:496 | [cplayer] warn:

That is in your log. Can you replay that file, fast forward to just before the 9 minute mark, let it play and see if you get the issue again before the 10 minute mark? If you do, there may be an issue with the file.

If it take 9-10 minutes every time regardless of the file, there may be some other issue. That error means something broke but we’re not sure exactly what.

I’m out of town, but will run it again when I get back. This happens with all my VC1 files and can vary how long it takes.

Thanks, and I’ll get you logs soonest.

I’m having the same stuttering issue, but with 1080p HEVC content. I can supply logs if needed.

@anon18523487
I played the movie again starting at about 8 minutes. The stuttering started after playing for about 3-4 minutes.

I also tested two other movies and a television show. The television show started about 2 minutes, while one movie was about 5 and the other about 5.5. I have included the 3 XML files and 2 logs for these videos and attempts.

The AppleTV and server are both connected to the network via ethernet.

I hope this helps. Any assistance you can provide is appreciated.

com.plexapp.plex 2022-08-08–01-29-57-328.log (1.0 MB)
com.plexapp.plex 2022-08-08–21-55-24-635.log (605.6 KB)
7701.txt (113.7 KB)
9167.txt (134.0 KB)
23175.txt (4.9 KB)

Please just play 1 video as requested and provide the logs after that test.

@anon18523487
Sorry about that. Here is the log for the one video played as requested. I started the video between 8 and 9 minutes and it took approximately 3-4 minutes before stuttering.

com.plexapp.plex 2022-08-08–01-29-57-328.log (714.1 KB)

Thanks. I’m seeing the same error being reported. Let me see if I can reproduce with something I have so I can pass it long to the devs. If not, I’ll need a file from you. Do you have any that are a <500MB in size and can reproduce this problem? I may need that if I can’t reproduce.

Were you able to reproduce this? I’ve tried creating a file that is <500MB that will reproduce the error. Unfortunately, I haven’t been able to reproduce the error on a file that small.

@anon18523487

Have you been able to replicate the issue?

Sorry, lost track of this thread. I was not able to reproduce the issue. The VC1 files I have all played fine. It’s very possible that the file itself has an issue when you ripped it. If you are seeing this on multiple files you have, but not all, it could be the ripping software you are using.

If you can get me any file that has this issue so I can reproduce, that would be best. Let’s up the size to 1 GB.

@anon18523487 I was able to get it down to 1.05GB and able to replicate the issue. As I mentioned earlier, this happens with a number of files using the VC1 codec. I have not tested all the ones I have, but this issue isn’t restricted to this one file.

Please let me know how to get you the file.

Please upload it to a sharing site like Google Drive and send me a link. I’ll let you know after I get the file so you can remove it to save space.

@anon18523487

I uploaded the file here:
https://www.dropbox.com/sh/nsvngwtkkewmu8r/AACLh8W-MlYEPETzgww9-EtUa?dl=0

Please let me know when you remove it.

Got the file. I’ll see if I can reproduce.

Very interested as I have exactly the same issue but on an Apple TV 4th gen (non 4K). Also VC1 with DTS Audio.

@anon18523487 I’ve had to switch to the old player a number of times after a movie starts stuttering. Has there been any progress on this?

@anon18523487 Any update on this?