757b & H.264 do not get along - tons of PTS underflow errors

MrVideo

Active member
757b does not like PBS Network sat feeds, which are H.264. This issue goes back several versions. 731a has no such issue. Makes no difference if it is XP or Win7.

Log files are attached. All of the files are available for uploading.
 

Attachments

Danr

Administrator
Staff member
Upload a source clip, you can use Tools>Trim to keep it a reasonable size.
 

MrVideo

Active member
It is already a short version, to make sure that it failed. Actually, the short version does end up finishing, just contains all those errors. The full-length version ends up with the yellow bolt of death.
 

Danr

Administrator
Staff member
OK, Found the problem. The header bit rate of the pre and post-roll title sequences if VERY low, and that's affecting the rest of the mux. This is an "improvement" after build 748. Will have to figure out how we can address & fix it.

How did you create the pre-roll sequence? Can you use the VideoReDo titler instead.
 

MrVideo

Active member
Thanks for discovering the problem quickly.

Those 2 sec black sequences came from the same PBS network sat feeds. I just combined a couple of 1-sec blacks between videos to make the 2 sec black. There is a black for DD2.0 and a black for DD5.1. Ya, PBS network feeds switch between 2.0 and 5.1. After all these years, NOVA is still DD2.0.

Whatever you were doing in 731a works just fine.

As for using the titler, I prefer not to. Easier just to drop two files in the joiner. Frankly, I shouldn't have to. I should be able to throw anything at VRD and it should work with it. 731a does.

As a side note, 757b fixed an issue with files containing AAC5.1 audio. Again, 731a didn't have an issue, but under XP, if the video has two MPA streams and an AAC stream,. the AAC stream was ignored. If there was only the AAC stream, VRD would complain that no audio stream was found. With 757b, it works as expected. Thanks for that fix.
 

Danr

Administrator
Staff member
Can't go back to the 731 method as 757 has the ts muxer timing needed for broadcast / cable purposes. Will see what we can do. In the meantime, create your own black segments in VRD and you should be good.
 

MrVideo

Active member
I'll stick with 731a, as I need AC3 2.0 and 5.1 audio. That is until you guys come up with a solution.
 

MrVideo

Active member
Because I need the black to contain DD2.0, or DD5.0 (depending on the PBS program), I'll continue to use version 731a, as it works.
 

Danr

Administrator
Staff member
If you add a title, of xx seconds black to the video it will match the audio of the program.
 

MrVideo

Active member
Won't be necessary. I thought I'd try something, as I still had the capture from yesterday still on the computer. I created a new black segment with 757b and it created the file with a header of 25Mbps, matching what it was originally. I joined it with the project file and the job ran without issue.

I now have a new black with DD2.0 to use. Next time I capture a DD5.1 program, I'll make a new black from that feed.
 

Danr

Administrator
Staff member
Anyway, thanks for uncovering this issue. It's actually a possible problem whenever you join files, and has been fixed now for the next beta.
 

MrVideo

Active member
You are welcome. Leave it to me to find these kind of things.

I took a look at the header for the original file and saw that it was extremely low. That is when I tried the latest version to see what it would do. No idea why 731a created files with headers that had bitrates lower than the bitrate of the file.
 
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