Subtitles getting out of sync when fastforwarding or resuming reproduction from an intermidiate point

[gahedros]

The new subtitle renderer works great in general, but I have noticed that when fastforwarding or resuming reproduction from an intermidiate point the subtitles tend to get out of sync.
Using to the old renderer fixes the sync issues, so is not a problem related to any particular srt file.

[iBaa]

This issue is known - see the thread in the plex forums.
Unfortunately I have no idea, why that is happening... do you have experience if it works with native files (mp4,h264) correctly? In other words: is this issue somehow connected with PMS transcoder usage?

[gahedros]

I mainly deal with mkvs, but I will do a test and get back you you.

[gahedros]

Ok, just tested it and with mp4 files there is no problem. I am guessing the PMS transcoder does not get the timing right after fast forwarding or resuming reproduction from an intermediate point, while the subtitles continue to maintain the correct timing.

Probably "Auto" should disable the improved subtitle renderer for anything that isn't an mp4 until a solution is found (or the PMS transcoder is fixed by the Plex developers).

[mickeyjee]

I'm experiencing this problem too. But it also happens with MP4 files. I'll check my settings, i think i'm using the "transcode always" and "subtitles auto" settings.

The subtitles go out of sync too when you don't watch from the beginning (when you watch where you left off last time)

[iBaa]

Why would you always transcode? If you run mp4 through the transcoder, it still could be its fault... right? The interesting part would be, having those issues with native playing MP4.

[mickeyjee]

I'm using always transcode because i experienced issues with the subtitles not always showing. I'm using mkv with external and internal subs and i'm using mp4 with external and internal subs. I think the mkv's didn't show subtitles when i used "auto". Maybe it's fixed now. Didn't test it lately.

How can i test "native playing mp4"?

[iBaa]

Well, use some MP4/h264 files (native aTV), provide an external SRT subtitle file (to display with PlexConnect/js), keep "transcoder action" at auto.
That way you should not request the transcoder, and PlexConnect's internal subtitle renderer (see subtitle.js as well as some functions in application.js) should run. My hope: no sync issues. :-)

[mickeyjee]

Sorry for my late reaction. I can confirm it works when playback is set to auto. I can skip a show now without sutitles getting out of sync. So what does this mean?

[iBaa]

My guess: when aTV is replaying the files natively, live is good. If the PMS transcoder is used, we are having sync issues...

[mickeyjee]

So it's probaby something only the Plex team can fix? :-) Maybe everything will work for me when i'm using auto for playback. I'll keep you posted

[marcotini]

It's still open? Because even 2 years later are still a problem.

[Esp10n]

Yes I'm having the same issue here... Subtitles go out of sync....

[mderksen]

@marcotini @Esp10n :
Open the Trailers app on aTV and go to the settings.
Set "Transcoder Action" to AUTO
Set "Subtitle Renderer" to AUTO

This worked for me a couple of years ago :)

[chrisl31]

Helo.
I have the same issue, even after @marcotini and @Esp10n settings ...