More > JRiver Media Center 23 for Linux
Quick Start Guide for Installing JRiver Mediacenter 23 ARM on a Raspberry Pi
mp48:
I set up the MC with a monitor but I do not know if I put the thumbnail priority to low. Now the raspi is running headless (and actually I cannot connect a monitor). Is it possible to access the thumbnail priority via ssh?
Yes I installed MC according to your excellent introduction, which worked perfect including the auto start according to your "old" instruction.
If gizmo is the possible crashing issue, I will now test for the next days with JRemote and EOS. If it runs stable, I will deinstall all gizmos. I will now monitor the issue for the next 3 days and come back with the results. If it still crashes I will also change the harddrive to an external hub with extra power supply. The actual external housing has only power supply via USB cable.
I remember there was a possibility to increase the current for the USB devices, can you please send me the comand line?
mwillems:
--- Quote from: mp48 on January 31, 2018, 07:13:50 pm ---I set up the MC with a monitor but I do not know if I put the thumbnail priority to low. Now the raspi is running headless (and actually I cannot connect a monitor). Is it possible to access the thumbnail priority via ssh?
Yes I installed MC according to your excellent introduction, which worked perfect including the auto start according to your "old" instruction.
If gizmo is the possible crashing issue, I will now test for the next days with JRemote and EOS. If it runs stable, I will deinstall all gizmos. I will now monitor the issue for the next 3 days and come back with the results.
--- End quote ---
You've misunderstood me; any of the android remotes will cause the problem I'm thinking of because all of them force MC to start thumbnailing like crazy which will create an out of memory condition. You can find instructions in the second post at the top for how to access a headless system remotely via VNC which will allow you to change the thumbnailing priority and pre-build thumbnails.
Zhillsguy:
Does MC still build thumbnails if the option is unchecked under Tools/Import/Configure Auto-Import?
mwillems:
--- Quote from: Zhillsguy on February 02, 2018, 12:40:55 pm ---Does MC still build thumbnails if the option is unchecked under Tools/Import/Configure Auto-Import?
--- End quote ---
Yes, MC will always build thumbnails when viewing albums, it's only a question of when they get built. If the option you mention is checked, MC builds the thumbnails when importing media. If you leave that box unchecked and don't pre-build thumbnails, MC builds the thumbnails on demand (i.e. when you try to view a library view that displays cover art either in a remote or in MC). On a normal PC this works great and doesn't really create any problems other than the UI might slow down on occasion. But building thumbnails on demand sometimes creates problems for the pi. The pi has very little CPU power and very little memory, so a sudden request to build a bunch of thumbnails (which consumes quite a bit of CPU and memory because its image processing), possibly while also decoding and playing music, will create enough memory pressure to crash MC (or get it killed by the linux out of memory killer). The "best" case scenario is that things slow down and you might get some skips and dropouts in the music.
The winning solution is to (when first setting up the pi) set the thumbnailing priority to low (which will reduce the CPU contention and memory pressure), and then click the menu item to build all thumbnails. Then leave the pi alone for a few hours or overnight. When you come back all the thumbnails will have been pregenerated and you will have a much more stable and performant MC instance on your pi. You're more likely to encounter this problem the larger your library becomes, but I've managed to trigger it with comparatively small libraries. The mobile clients seem to be more likely to trigger the problem, I think because it's easy to scroll through a huge list of albums which triggers on-demand thumbnailing for all of them.
Zhillsguy:
Thanks for the detailed explanation. I've always been curious about thumbnail generation. You are spot on about the Pi getting overwhelmed easily, it doesn't take much of a bump in the road to make it skip or buffer, but if set up correctly it's quite usable.
I've been looking at other SBC's, and ended up ordering an Odroid C2. More powerful but not as much community support. There are enough available OS images to make it palatable to use with MC.
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