What is RT xruns and Media xruns?

[Aleksandr_Oleynik]

What is RT xruns and Media xruns (in Performance Meter)?

[xpander]

Afaik, RT xrun is a Real Time buffer underrun, meaning that CPU couldn't deliver the whole audio buffer in time. I don't know what the difference is to Media xrun, maybe somebody knowing these will give a better description?

[Aleksandr_Oleynik]

I often see the situation when in a hard project xruns = 0 while Media xruns = 10 and increases slowly. Do I have to worry about drops, if xruns (not Media xruns) still remain 0?

[karbomusic]

Originally Posted by xpander

Afaik, RT xrun is a Real Time buffer underrun, meaning that CPU couldn't deliver the whole audio buffer in time. I don't know what the difference is to Media xrun, maybe somebody knowing these will give a better description?

I would imagine media is underruns for the media, aka media streaming from disk has it's own buffer.

[Aleksandr_Oleynik]

I put Media Buffer size 0 ms - and all the dropouts stop, Media xruns = 0.
It's strange.

[karbomusic]

Originally Posted by Aleksandr_Oleynik

I put Media Buffer size 0 ms - and all the dropouts stop, Media xruns = 0.
It's strange.

Yea not sure, since I'd expect the opposite, need to think about it. Well let me rephrase if you are hearing audio dropouts and seeing media xruns that go away when setting the buffer to 0ms, that would be weird - if you are not hearing audio drop outs, I think setting the buffer to zero ms is a bad idea - I'll explain later when I can find one of the threads where I've already done all the work explaining how the media buffer in reaper works.

[Aleksandr_Oleynik]

I expected the opposite too

But -

[karbomusic]

Hmm, one type flashes red, one type is yellow. Is disk red? I forgot but I think it is.

That being said, your disk transfer looks low or better said are you sure your disk can keep up because that can bottleneck regardless of the settings. For example, I pulled up a project and was seeing something closer to 10MB/s - how many tracks of audio, where are the samples if there are samples and so on. Mine is an SSD though.

I never see media underruns except when the disk performance is substandard or I have so many tracks it can't keep up but that requires and awful lot of audio tracks. It was far more common back when the OS didn't defrag automatically, the disk would get fragmented and the head jumping around due to fragmentation caused the disk delays.

[Aleksandr_Oleynik]

In project 13 track with Items
Items in SSD -



ASIO buffer size - 64 spl

[Ollie]

Not sure if and how this relates to anything but do you really have a 5 core CPU with HT, or a CPU with 10 physical cores and how come you allowed live FX multiprocessing on 20 CPUs (that number is supposed to be smaller than the number of physical cores)? That doesn't seem to make any sense.

[Aleksandr_Oleynik]

I have i7-6950X with 10 physical cores and 20 with HT.

[Patrice Brousseau]

Sorry to necro this thread. Having media xruns on an USB3 hard disk reading 130 mb/s with BlackMagic SpeedTest. Setting media buffer size to 0 ms solved my problem. Go figure!

Tried the default 1200 ms with no luck!

[Patrice Brousseau]

Aleksandr, any news about it? Anyone?