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Dec
2
comment Select pixelformat H264 for webcam in Chrome
Actually on some other machine, I first used VLC to set the camera to H.264 encoding and then started a Chromium browser capture. However, the setting is not kept. BUT on this machine Chromium used MJPEG by default (the third format listed), which is not perfect but much better. I now wonder if this is a Chromium vs. Chrome issue, or caused by running VLC before.
Dec
2
comment HD Pro Webcam C920 video choppy on new Win 10 PC using any software other than Logitech Webcam Software
If several applications have the same problems, maybe they use the same video decoder (maybe provided by Windows, or by the camera software if installed) and it fails. Essentially, an application can decide to get the compressed stream from the camera and decode it iself, or let the Windows API do that. Depending on that, a viable H264 decoder is needed in at the right place. You may look for the media codec list in device settings if a H264 codec is listed, and see if it could be replaced by some other one.
Dec
1
comment HD Pro Webcam C920 video choppy on new Win 10 PC using any software other than Logitech Webcam Software
This webcam is in fact still sold at a quite high price, at it is able to povide FullHD video over USB 2.0. There are still no consumer webcams sporting usb 3.0 available, so FullHD via H264 is still the limit in consumer sector. The camera also has quite large optics, which almost none of the other FullHD webcams have. I guess USB3.0 webcams would exceed this camera's performance, but cameras using USB2.0 just can't get much better.
Dec
1
comment Select pixelformat H264 for webcam in Chrome
Yes, it works with any software that provides the interface to select the pixelformat (like ffmpeg or vlc). I think Chrome just defaults to YUV as this is the first format in the list of possible formats?
Nov
22
comment How to reliable attach to session DBUS over ssh?
On the other hand, pulseaudio uses dbus and should find and autenticate its own socket too if the right dbus is available.
Nov
22
comment How to reliable attach to session DBUS over ssh?
Maybe iv'e mixing something together... As some dbus apps work, eg. the d-feet dbus viewer, I guess it has more to do with pulseaudio sockets besides of it's dbus connection.
Sep
16
comment Remove list of items from another file in bash
Cool, I didn't know about comm.
Aug
16
comment Optimize linux USB hub IO scheduling for external harddrives
The phenomenon I tricle for two days now gets a new twist: Using external power, transfer rates attend the expected speeds. While all drives are spinning happy, only one gets the expected transfer speed at a time without external power. There are no hints in dmesg or something. It seems the drives, or the hub exchange information on available power and adjust operation to it. Is there any known feature or reference for such behaviour?
Aug
11
comment Delete VirtualBox snapshot's running state
It is, however, possible to delete an intermediate snapshot with running state between non-running ones, like deleting any other state inbetween. So technically it don't seem a large issue, it's just not implemented it seems... Too sad.
Aug
10
comment Run commands from a pipe in realtime
This is nice, but works for example pipe only (using grep). I would favor a more general answer like in the comments above.
Aug
10
comment Run commands from a pipe in realtime
The stdbuf method works, so the answer to this question is almost the same as to "how to get unbuffered pipes" questions all around.. Maybe you post a similiar answer?
Jul
23
comment Linux USB device won't work after power up without replugging
It seems the BIOS is messing up with the device. If it is plugged just when the BIOS runs the boodloader, it works.
Jul
21
comment Linux USB device won't work after power up without replugging
There is an option in the BIOS to keep it from initalising USB devices. It seem to fix the issue, but introducing a cruft of new ones.
Jul
21
comment Linux USB device won't work after power up without replugging
modprobe does not help, as all usb modules ehci, xhci and ohci are built into kernel on Ubuntu 14.04.
Jul
21
comment Linux USB device won't work after power up without replugging
dmesg says like [ 1.547635] usb 1-6: new low-speed USB device number 5 using xhci_hcd [ 1.549013] usb 1-6: Device not responding to setup address. [ 1.955468] usb 1-6: device not accepting address 5, error -71
Jul
21
comment Linux USB device won't work after power up without replugging
This behaveour even holds when the device is connected by an USB hub.
Jun
29
comment Snapshot a frequently changing file on linux
It is possible to snapshot the file by mv, but that would lead to the problems mentioned above. Maybe the file used for reading and for writing can be two different ones, so the file just written may be copied while writing just fast enough to be repoened for reading the next round. If there would be a special kind of fifo, that would dissect read and write access, one could maybe use tee to capture the output to two files and cat to present the process the last written file for reading.
Jun
29
comment Snapshot a frequently changing file on linux
It is an image that is sequentially updated. So the app most likely reads the full file, and completely writes it afterwards. So if the file is taken away in the meantime, it would be recreated I guess. If however it would go away before reading, it would crash or recreate an empty image which would then replace the real one.
Jun
28
comment Create empty truecolor PNG with ImageMagick
Ah cool. So the internal color format is actually not used, but the selection is made by the output format. The png24: worked well for me. Thanks!
Jun
24
comment Show Octave plot from shell script
Ah I forgot to mention the scripts where non-interactive. Added that. I'm sorry!