I would like to automute certain audio clients when I want, without human intervention (e.g. pulling up pavucontrol) when using Fedora/pulsewire. This worked before using pacmd, but that doesn't work under pipewire; and the replacement command, pw-cli, doesn't support set-sink-input-mute or set-source-output-mute.
pw-cli doesn't seem to support muting that I could see. pw-mon shows a relevant change when using pavucontrol (or easyeffects) to mute a stream, but that didn't help me figure out how to do it myself.
This is a bit late but i recently needed it too. Instead of pacmd you can use pactl set-sink-input-volume <sink-id> <volume>
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I am trying to create snapshots from a video stream using the "scene" video filter. I'm on Windows for now, but this will run on Linux I don't want the video output window to display. I can get the scenes to generate if I don't use the --vout=dummy option. When I include that option, it does not generate the scenes.
This example on the Wiki indicates that it's possible. What am I doing wrong?
Here is the line of code from the LibVLCSharp code:
LibVLC libVLC = new LibVLC("--no-audio", "--no-spu", "--vout=dummy", "--video-filter=scene", "--scene-format=jpeg", "--scene-prefix=snap", "--scene-path=C:\\temp\\", "--scene-ratio=100", $"--rtsp-user={rtspUser}", $"--rtsp-pwd={rtspPassword}");
For VLC 3, you will need to disable hardware acceleration which seems incompatible with the dummy vout.
In my tests, it was needed to do that on the media rather than globally:
media.AddOption(":avcodec-hw=none");
I still have mainy "Too high level or recursion" errors, and for that, I guess you'd better open an issue on videolan's trac.
I am currently creating a music player in python 3.3 and I have a way of opening the mp3/wav files, namely through using through 'os.startfile()', but, this way of running the files means that if I run more than one, the second cancels the first, and the third cancels the second, and so on and so forth, so I only end up running the last file. So, basically, I would like a way of reading the mp3 file length so that I can use 'time.sleep(SongLength)' between the start of each file.
Thanks in advance.
EDIT:
I forgot to mention, but I would prefer to do this using only pre-installed libraries, as i am hoping to publish this online as a part of a (much) larger program
i've managed to do this Using an external module, as after ages of trying to do it without any, i gave up and used tinytag, as it is easy to install and use.
Nothing you can do without external libraries, as far as I know. Try using pymad.
Use it like this:
import mad
SongFile = mad.MadFile("something.mp3")
SongLength = SongFile.total_time()
I'm trying to write a program that uses GStreamer to connect to PulseAudio as a source so that I can intercept any audio that's being played. I have no need to play it back so my assumption is that my pipeline only needs a source and demuxer, I'm not sure of the latter though. The hello world example that I'm working off of is here, except that instead of using "filesrc" I'm using "pulsesrc".
Is there a good example that shows this out there already and I haven't found the right combination of terms to make Google give it to me? Do you have to do anything to PulseAudio to make it let you monitor its stream? Should I actually be trying to instead connect to a sink to monitor what's being played?
I think you will need to check the sources with e.g.:
pacmd list-sources | grep -e device.string -e 'name:'
and then connct to the source ending on ".monitor" by using the "device" property of pulsesrc.
I use the audio class to read MP3 file thanks to a little trick : replacing the ffmpegsumo.so of Node-Webkit with the chromium one. This enable the reading of MP3 on Windows but doesn't works on Mac OS. Does anyone know why ?
Here's the code :
player = new Audio()
player.src = '/path/to/the/audio.mp3';
player.play();
This seems to be dependant upon the dll/so being a 32 bit version. I am guessing that is why copying the file from Chrome doesn't work correctly for most people ( my 3 year old phone is the only 32-bit device I have left ).
I keep seeing this link --
https://github.com/rogerwang/node-webkit/wiki/Support-mp3-and-h264-in-video-and-audio-tag
.. but it is a blank page. I am guessing it was deleted since the info was likely not current or correct.
This issue thread has links to some rebuilt ffmpegsumo libraries for both Mac and Windows --
https://github.com/rogerwang/node-webkit/issues/1423
The alternative appears to be rebuilding ffmpegsumo, this thread has some config for doing that -- https://github.com/rogerwang/node-webkit/issues/1208
I am still confused about the licensing on it after you build the library, so that is probably worth some research. Everything about mpeg4-part10 is copyrighted and heavily patent encumbered. I think we all need to get smart enough to stop using mp4/h.264. Before I got this working correctly on node-webkit, it was easier to use ffmpeg to transcode the video to an ogv container using Theora and Vorbis codecs. At this point it seems like iOS is keeping h.264 alive, when it should probably die the horrible death it has earned.
I'm trying to write some code against libnotify, but the documentation for perl with libnotify is seriously lacking. So is there something that, as of 2011-08-26, is "better" than libnotify? All I need is to send a notification to the currently logged in user on a Linux machine (Ubuntu specifically).
Gtk2::Notify does seem to lack good documentation, but you can browse through some examples at http://cpansearch.perl.org/src/FLORA/Gtk2-Notify-0.05/examples/ including the basic one:
#!/usr/bin/perl
use strict;
use warnings;
use Gtk2::Notify -init, 'Basic';
my $n = Gtk2::Notify->new('Summary', 'This is some sample content');
$n->show;
In fact this seems pretty cool, I may use it for something soon! Thanks for bringing it to my attention.
Otherwise:
On Linux you can use zenity to send a popup message, and to send it to another user's screen you have to play with some environment variables but it can be done. From Perl I would set the appropriate %ENV values and then just execute system or backtick (``) calls to zenity.
Perhaps start here http://www.cyberciti.biz/tips/spice-up-your-unix-linux-shell-scripts.html
Also from within that link, perhaps libnotify-bin/notify-send would also work, depending on the message you are sending.
perl -E '$ENV{DISPLAY} = ":0.0";`notify-send "Hello World"`;'
From what I searched, when porting an application from Windows to Linux, there's no :(
I'll glad to here if there's.
Update: Indeed I was talking about libinotify and not about libnotify.
As far as I can tell freedesktop specification contains a notification service which can be accessed via dbus.
Here is a link to a perl module for that feature.