Universal Media Server | Forum

Hi,

I am using Ubuntu 20.10 with UMS 10.0.1 and VLC 3.0.11.1. As soon as I try to transcode a video with VLC, I get the following java exception:

java.lang.NullPointerException: Cannot invoke "javax.swing.JCheckBox.isSelected()" because "this.audioSyncEnabled" is null

This seems to be independent of UPNP device and also video codec, as I tried several different ones.

Cheers

Thanks for reporting this. I believe I have fixed it, please try https://www.universalmediaserver.com/up ... x86_64.tgz

Thank you for the quick response, there is still an exception but it changed to this:

Caught exception: Cannot invoke "javax.swing.JCheckBox.isSelected()" because "this.experimentalCodecs" is null

Cheers

Ah, similar bug. That should be fixed in https://www.universalmediaserver.com/up ... x86_64.tgz

Hi,

Yes, the java exceptions are fixed now Now I get a segfault with vlc, showing this error:

avcodec encoder error: Unknown option "rc_buffer_aggressivity"

But at this point I am not sure if this is a UMS or VLC issue, or some issue with my env, maybe you have an idea about it.

Cheers

Thanks, at least we are making progress. It's possible we are using some outdated options so it could be good to experiment with them. We are passing in:

vlc -I dummy test.mkv --audio-track=0 --sub-track=-1 --sout #transcode{ab=448,vcodec=mp2v,channels=
2,strict-rc,soverlay,acodec=a52,scale=1.0,threads=8,vb=4096,samplerate=48000}:standard{access=file,mux=ts,dst='/tmp/UMS-root/VLC1612789089004.ts'} vlc://quit

Hi,

The only option I was not able to verify is the "strict-rc" option, in Google I only found references to the ffmpeg module, like in this example:

#transcode{venc=ffmpeg{vt=0,strict=1,keyint=12, rc-buffer-size=4000,strict-rc}...

but not as a plain option. Nevertheless, I am not a VLC expert, so maybe someone else can also have a look at this.

Cheers

Can you run the VLC command from the logs in your command line, and try without strict-rc?

YES IT WORKS

I gradually removed options in the string but vlc kept segfaulting. Then I downloaded the vlc 3.0.12 source code and compiled it, voila now it works. The latest Ubuntu vlc version is 3.0.11.1, so either this is a bugfix from 3.0.11.1 -> 3.0.12, or some hickup with my libraries and compiling fixed it. Anyway, works now nicely.

Cheers

That's great news, thanks for confirming that