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Bigmack3000

1200 Minute Conversion Error

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Bigmack3000

Every now and then when I convert a file, Emby makes the final file 1200 minutes long.  I can cut off the excess and the file is then fine, but it's an odd problem to run into.

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Luke

Hi there, what is the length of the source? What kind of source file?

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Bigmack3000

Various lengths. from 20 minute shorts to 3 hour films.  They are mkv rips of blurays and/or dvds.  It seems to be random too.  I could convert a season of a show, and two thirds of the episodes are fine but then the other 3rd have this problem. 

 

But it's also seems to just be the timecode that's incorrect.  There's nothing actually playable after the end of the film's normal runtime.  

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Luke

How are you determining that its' 1200 minutes?

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Bigmack3000

5de4255e4ed99_ScreenShot20191201at34014P

 

It shows up with that length when opened in VLC.  But if I scroll past the normal runtime, the file closes.  Which makes me think there's no actual data added, just the wrong length being put in the file conversion.  But every time it happens, it's the same wrong length.

 

Also, I don't know why the screenshot uploaded like that, but the actual video looks fine after the conversion.  It's just the length.

Edited by Bigmack3000

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Luke

What length does the new file show in Emby?

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Bigmack3000

5de4296833a63_ScreenShot20191201at35745P

 

Same length.  

 

The uploaded looks odd, but again that part looks fine on my computer.

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Bigmack3000

I'm not positive, but as I go through all the ones that have this happen, It seems to be far more common in files that had subtitles auto burned in during conversion.

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Luke

Can you provide a source file for testing? Thanks.

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Bigmack3000

Sure, but how would I do this?

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Luke

dropbox or google drive would be great. before you do that, can you provide an ffmpeg conversion log in case we might be able to spot something there? thanks.

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Luke

So just to confirm, you haven't yet seen this when not burning in subtitles, right?

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Bigmack3000

I don't believe so, but I have about 5 converting tonight that shouldn't have subtitles burned in.  I'll check them when they're done.

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Luke

Ok thanks. I was actually just able to reproduce this on an input file with pgs subtitles.

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Bigmack3000

You think the type of subtitle is the problem?  

 

Also, none of the conversions last night or today had burned in subtitles and none had the error either.

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Luke

We're looking into it. Thanks.

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Bigmack3000

Would it be possible to just make burning in subtitles optional?

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Luke

Yes more subtitle conversion options are planned for the future. Thanks.

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softworkz

You think the type of subtitle is the problem?  

 

Also, none of the conversions last night or today had burned in subtitles and none had the error either.

 

So, here's what's happening:

 

5dea076068139_subtitle_burn_in_issue0png

 

 

Sometimes (or maybe even always in case of PGS subs), the subtitle frames not have valid values for start_display_time and end_display_time

 

Like above:  4294967295 is just the maximum for 32 bit uint, but ffmpeg seems to interpret that value.

 

That is no problem as long as there's another subtitle frame following which indicates the end of the previous one (that next one might even be empty just to invalidate the previous one).

 

But when it comes to the very last subtitle graphic the end_display time is considered to be a frame event. Ffmpeg considers the 4294967295 to be valid and "waits" for that to happen. Meanwhile. the video main has ended as well, but by default configuration, the overlay filter repeats a stream's image when it has reached its end.

 

And that causes one additional frame to be added to the output file with an insanely high timestamp value:

 

 

5dea0a8e67c2e_subtitle_burn_in_issue.png

 

That one additional frame is in turn causing the high and incorrect container duration.

 

This is fixed in the upcoming beta (4.4.0.1)

Edited by softworkz
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pwhodges

What's the program generating those windows?

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softworkz

It's an internal tool.

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Bigmack3000

That's interesting.  Thank you for the in-depth explanation!

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Bigmack3000

Also, how would I get in on the beta?

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Bigmack3000

I'm not sure if the update was supposed to fix the problem.  But just incase, it's still happening for me.

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