Rodrigo Martins de Oliveira's questions

Videos that are encoded with H.264 or VP8 codecs (possibly others too), regardless of the container (MKV, MP4, WEBM, etc), will only play audio in VLC, at least in Ubuntu 20.04. Interestingly, GNOME Video application will play those files just fine.

I've tried restarting the computer and let VLC run alone without any other user programs running concurrently to avoid interference. I've installed and reinstalled vlc, ubuntu-restricted-extras, ffmpeg, libdvdnav, libdvdread7, gstreamer1.0-libav and various other packages, clearing gstreamer cache and nothing changed. I've tried forcing VLC video demuxing to H264 video demuxer but I've got the following error VLC could not decode the format "h264" (H264 - MPEG-4 AVC (part 10)) which led me just to dead ends in Google Search.

What else can I try? I haven't found any other source in the web that have solved a case similar to mine.

The Spotify client installed from the snap store is barely usable on HiDPI displays and there seem to be no built-in options to scale the UI. Is there a workaround to scale it?

I have read about using Landscape like a VNC program and I want to access my home computer through the university PC, which runs Ubuntu 12.04. I have read that I need to add my home PC as remote desktop in Landscape website.

Although I am asked for a Server URL, which I don't know exactly what is. My home computer is connected in the web router through wireless and I use dynamic IP, and I think I should set up a static IP for that, and I don't know how to do it, already tried through ifup command, editing interfaces file, although I didn't managed to accomplish that.

I want to share a .tex file with another person for us to edit it together, I took a look over collaborative editing in Gedit, that is awesome.

Although it still lacks an important feature for me, that is: When one user edit something it stay marked with different color until the other accept the edition, and when one user delete something it isn't instantly deleted until the other user accept so.

Editing a file simultaneously doesn't matter for me, but recording one user's editing and only applying it after the other accepts do.

This feature is present in LibreOffice, I took a screenshot:

It is in Portuguese, but what matters is that black text is text that was already accepted from both users, blue marked text is text I wrote, but the other user still didn't accept and yellow marked is text that the other user wrote but I didn't accept yet. Then I can right click on the text and select to accept the suggestion and the marked text will turn black normal text. (Blue strikeout text is text I deleted and the other user didn't accept yet)

This is a key feature for me. I need to edit a .tex file this way, can be with Sublime, Gedit, Geany, Kile, etc. I prefer Gedit, Geany or Kile although any plain text editor that has this feature will be welcome. If this feature simply doesn't exist in plain text editors then I can edit the .tex files through LibreOffice, but I don't want to do it.

I was impatient with a torrent download and then I opened Transmission's Preferences and went changing everything I could to as close as possible to infinite, closed and OK.

After seeing that the speed was still the same I went over the Preferences dialog again and set the values of “Queue” section under “Downloading” tab to “999999999999”, although it doesn't allow such values and reset to the maximum permitted. Obviously that changing that wouldn't increase the speed, although I was veeery impatient, and after changing “Downloads sharing data in the last N minutes are active”, which also didn't accepted the astronomic number and reset my entry to “28410”, Transmission froze, I tried to force it to close and open it again but it lags to start and when it do start, already starts frozen.

Now not even removing or purging or manually deleting it's files and then installing again transmission-gtk and transmission-common will do the job.

I suspect that some configuration file is being kept after purging transmission, because when I install it again, all my torrents are still there (and I only use magnet links) and they show the correct progress bars. After starting Transmission it will work for 3 seconds and freeze after that, in these 3 seconds I managed to open Preferences dialog and I saw that the value of “Downloads sharing data in the last N minutes are active” is still “28410”.

If at least I knew where the file that stores these values is, I could manually reset them all. And when I start a Guest session and open Transmission it will work normally, reinforcing that the problem is in the value of “Downloads sharing data in the last N minutes are active” that I changed up to the maximum.

What should I do?

Does NotifyOSD keeps a history of its messages? If so how can I access it?

Because sometimes it would be very useful to me being able keep record of the notifications in order to report some bugs and other related stuff.

As it was presented in OMG! Ubuntu! a voice recognition tool is being developed and will possible deploy in Ubuntu Touch and Ubuntu Desktop.

Although beyond the video shared in youtube I had no more information about that, rumors said that a testing ppa would be available for Ubuntu 13.04, although I didn't got anything else about this matter.

So if anyone knows about a testing PPA or any other way to test it share with us.

For some weeks I was unable to use Ubuntu due to Windows 8 preventing its boot, so I noticed an interesting function that I missed in Ubuntu:

In Windows 8 when I plug-in my headphones I was able to open the mixer options and set the speakers to reproduce the audio, even with the headphones plugged and more than that I was able to handle my skype conversations through the headphone while listening to my music, or youtube videos, or games in the speakers.

Although in Ubuntu when I go "Sound Settings..." > "Output" I was unable to redirect the audio to the speakers while the headphone was connected. I have three options: Digital Output (S/PDIF) Built-In Audio; Analog Output Built-In Audio; and Analog Headphone Output Built-In Audio. When I choose Digital I have no audio at all, in any situation. Although it doesn't matter if I choose Analog or Analog Headphone the audio will be headed to the headphone.

Then I noticed that it was a problem: I am not able to use the speakers while my headphones are connected, the main point here is not to separate audio from skype, from the other things, I guess (and hope) that it can be easily set in skype settings once the main problem is fixed: set the speakers as primary reproduction devices even when my headphones are plugged in.

As the title says, I want to increase the number of rows that are passed when I use the mouse wheel for scrolling. I know that there exists ways to do that for Firefox and Chromium, although I want something for the entire system, mainly because of the PDF reader.

I am on a Desktop and use a Microsoft Wireless Mouse 5000.

I had read in some sites that it is possible to run two OS'es in the same machine at the same time through a Virtual Machine software, so you can switch Virtual Terminals with keyboard hotkeys and be on Ubuntu browsing the web and switch to Windows to write a document, no need to restart and choose the other OS, both running simultaneously.

So first thing: Is it true?

If it is indeed possible how can I do that?

And what are the drawbacks?

Sorry if I misunderstood something about Virtual Terminals, although I don't know a lot about them and how they work or even for what purpose they exist.

OBS.: I noticed that my motherboard offers Intel Virtualization Technology, that says that this feature makes use of a hardware design that makes better virtualization (or helps, don't know) than software virtualization.

I'm very excited about Ubuntu being able to run trhough an Android smartphone just by connecting it to a monitor, a keyboard and a mouse. Now I'm wondering if there is a way to test it? Are there any daily-builds of it? Alpha package?

If you don't know what Ubuntu for Android is take a look at it's page.

Other things I'm unsure about Ubuntu for Android is:

• Will it work for tablets too?
• Does it require a dual-core smartphone?
• Do you necessarily need a Dock?
• Is there a release date for the first version of it?

I've looked for some info in Ubuntu for Android LaunchPad page, but I didn't find anything useful.

In This Page Canonical lets you to leave your contact if you are interest in Ubuntu for Android.

I intent to buy a new Desktop PC, but I'm wondering if I can share one machine between 2 users. I read about the subject, however I didn't find any guide for that, only some isolated answers/comentaries. Then I tried to test it with my laptop that has only one video board, but after some tries that failed and killed my graphicall interface and at each try I had to reinstall my system, I gave up.

I know that LightDM does support multiseat, but it's only unlockable through editing lighdm.conf, there are not any graphicalleasytouseandfullofbuttons programs... and any instructions.

So the questions are:

• Can I have a multiseat system using Ubuntu 11.10/12.04 with two video boards? And if so, HOW?

• Can I have a multiseat using one video board? If so, HOW?

Thank you for the attention, Rodrigo Martins.

[EDIT] I've been trying to get something from these sources:

Support multi-seat

Configuration file for setup1

LightDM.conf

Virtual terminal switching with multiseat setup and lightdm

multiseat sample xorg.conf ati intel

I figured out more or less how to setup lightdm.conf for multiseat, but the problem now stands at xorg.conf, looking at the fourth and fifth links I had some idea of how to do the configuration, but I don't know how to call my second screen, that is connected to the VGA output , in the Section when it asks for the 'Identifier', 'Screen' and 'Monitor', is it just to put screen1 and monitor1? vga and vga-monitor?

Can you help me with this?

I have a pc that shares internet connection to another device, which is configurated to access it's manufacturers website and get any updates available. Note that this internet sharing is made through my ethernet port and that the device isn't configurable to access any other website.

Are there any methods to get all the data that is passing through my ethernet port and then connect my pc to the device and reproduce exactly what the website sent to the device when I recorded it like making my pc the website?

An Example:

• Device x Website

  • device : get the website ID
  • site : 0000000XX0Xx00xx0
  • device : get date and time
  • site : 12:30.31-12-2011GMT-4
  • device : download updates if available
  • site : pkg1.zip pkg2.iso pkg3.tar

• Device x PC

  • device : get the website ID
  • pc : 0000000XX0Xx00xx0
  • device : get date and time
  • pc : 12:30.31-12-2011GMT-4
  • device : download updates if available
  • pc : pkg1.zip pkg2.iso pkg3.tar

So just reproduce the same thing the website sent to the device, but it'll be my pc that will be sending the data.

Thanks for the attention, Rodrigo.

If I don't have a hardware that supports 3D acceleration, is it possible to run Gnome 3? If no, is there some work on it and where I can go to get tunned about the progress of it?

Just one extra doubt: I run Unity 3D not Unity 2D, but my hardware doesn't support 3D acceleration, is it possible? If no, maybe my hardware supports it, but I just don't know and if it's true, why I can't set Gnome 3 to run?

[Added] /usr/lib/nux/unity_support_test -p returns:

OpenGL vendor string:   Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) 915GM GEM 20100330 DEVELOPMENT x86/MMX/SSE2
OpenGL version string:  1.4 Mesa 7.10.2

Not software rendered:    yes
Not blacklisted:          yes
GLX fbconfig:             yes
GLX texture from pixmap:  yes
GL npot or rect textures: yes
GL vertex program:        yes
GL fragment program:      yes
GL vertex buffer object:  yes
GL framebuffer object:    yes
GL version is 1.4+:       yes

Unity supported:          yes

So, yes my hardware seems to support 3D hardware acceleration (OMG! This dinosaur has it's tricks! I just can't believe), well I always stay happy with sooo many YESes and no errors =D Glad! Resuming, I really want to use Gnome 3, not Gnome-shell or fallback, so, what is missing? Maybe my 480Mb RAM Memory? Or my Celeron M at 1.6GHz???

since I started using ubuntu (9.04) I try to get my webcam working, but I never got any success, 2 years passed and I didn't get any progress, then, sometime ago I leave Windows out of my computer forever and now I can't use my webcam anyway.

I ask you: Is it time to try developing my own driver to my webcam? If yes, how I get started on it, I know a bit of writing plugins, extensions, themes, but I've never got my attention to drivers, so what do you recommend to me?

Additional information:

• lsusb
  • ????:eb1a Empia Integrated Webcam Elite Group.
• notebook - Asus A3H, Celeron M 380 1.6GHz 480Mb
• I have two other external webcams, they are recognized but their resolution isn't fully supported.
• I remember this lsusb because it was 2 years of tries, but if I try it now in the terminal it actually shows nothing, it stays like processing something and never show any info.

I was wondering if someone can tell me where are the main Unity configuration files, at least the file that you can graphically configure through CCSM. I'm wanting to edit the dash size and the panel colour, but I didn't find where to do it.