18. Dezember 2016 in GNU/Linux, Multimedia, Programmierung, Technik.
„waveform“ is a commandline utility for GNU/Linux, written in C, that takes a constant-bitrate (CBR) encoded MP3 file as input and generates waveform diagrams like this:
 „waveform“ Test #1: 16bit signed integer at 44100Hz, 1 channel. |
 „waveform“ Test #2: 16bit signed integer at 44100Hz, 2 channels, stereo. |
11. Januar 2015 in Sonstiges.
Die Tage habe ich die „Villa Rustica“, also den römischen Gutshof im Wiesenbacher Forst „Herrenwald“ besucht. Es handelte sich um einen landwirtschaftlichen Betrieb römischer Zeit mit Ackerbau und Viehzucht aus der Zeit von 130 bis nicht später als 260 n. Chr.
7. Januar 2015 in Administration, GNU/Linux, Programmierung, Technik.
Addendum to my previous post
„Using VIm’s „Negative Lookahead“ to Delete All Lines NOT Containing a Pattern„
I received a message from a reader who goes by the name of „bw1“ who points out that my task „to delete all lines in the current file not containing the string foo“ can easily be accomplished by issuing this command
:v/foo/d
🙂 I should read the VIm documentation once in a while!
7. Januar 2015 in Administration, GNU/Linux.
Written as a Bourne Shell-Script that invokes a Perl one-liner:
LC_ALL=C df -kPT | perl -ane '!/(^Filesystem|tmpfs)/ && do {
printf("%-33s: %s\n", $F[0], "*" x int((`tput cols`-35) * $F[3] / $F[2]))
}'
7. Januar 2015 in Administration, GNU/Linux, Programmierung, Technik.
UPDATE:
Please note that „bw1“ has notified me of a much simpler solution than what is described here; please see
„Using VIm’s „:v“ Command to Delete All Lines NOT Containing a Pattern„
Some statements have been struck through in the article below because they are false.
I want to delete all lines in the current file not containing the string foo:
:g/^.*?\@!foo/d
Explanation: Using the global command g („act on range or entire file“) like :g/pattern/d applies the command d („delete line“) to any line in the current file that matches pattern.
Since VIm generally does not support inverting RegExps (for example like sed does with the modifier !), I employ the „negative lookahead operator“ @! (that has to be escaped \@!) of VIm-RegExp-syntax.
Since, in VIm RegExp syntax, look-ahead must follow something (why? I don’t know) I precede it with ^.*, but this is not enough, since it renders the obscure error E62: Nested \@ (why? I don’t know).
But it works if I make the preceeding term optional using the ? modifier. It’s a horribly inefficient RegExp, but it’s shortest to write (which is what VI-commands are all about).
And now you know that, too. 😀
P.S.: If you know a shorter version let me know – FYI, I already know
:%!sed /foo/\!d
and it does not count – VIm onboard stuff only! 😉
27. April 2014 in Technik.
I have updated my YouTube Userstyle to the latest names they have given to their BS.
You can visit the style’s entry at userstyles.org for review and installation:
See also: Original announcement (20 Nov 2013).
12. Januar 2014 in GNU/Linux, Multimedia, Programmierung, Technik.
This project provides a JavaScript constructor MyPlayer({...options...}) that can be used to embed lists of audio files as read from an index document or an M3U into a web document.
They will be displayed in a playback GUI with a playlist that can optionally be filled from the „title“ and „artist“ values of the files‘ ID3 tags (v1 and v2 are supported).
The player is „detachable“, meaning the user can open it in a new window, preventing that playback breaks when the user leaves the page.
You can read my commentary about this release below.
11. Januar 2015 in GNU/Linux, Programmierung, Technik.
Ich habe einige deutschsprachige Textbausteine in meinem Thematic-Child-Theme „linuxfoo“ angepasst. Dazu benutze ich eine Datei mit eigenen Übersetzungen auf Basis der „de_DE.po“ in „Thematic“ selbst und übersetze diese mit dem Gettext-Werkzeug „msgfmt“. Das Verfahren wird nachfolgend im Einzelnen beschrieben.