Hello World mcxiaoke

Get/set ID3 meta tags using ffmpeg

A quick guide on how to read/write/modify ID3 metadata tags for audio / media files using ffmpeg.

FFmpeg has a free-form command line option that allows the user to specify key-value-pairs for encoding metadata. Let's take a look.

1. Read ID3 metadata

To list all global metadata tags for a media file, just set an input but no output file.

sudo sed -i 's|${CMAKE_INSTALL_FULL_BINDIR}|/usr/bin|g' /lib/systemd/system/gammu-smsd.service

sudo systemctl daemon-reload
sudo systemctl restart gammu-smsd

Reference

https://askubuntu.com/questions/1260261/how-do-i-remove-a-misbehaving-package-using-either-apt-or-apt-get

Useful Examples of ffmpeg and GNU parallel on the command-line:

Transcoding FLAC music to Opus:

ffmpeg is a highly useful application for converting music and videos. However, audio transcoding is limited to a a single core. If you have a large FLAC archive and you wanted to compress it into the efficient Opus codec, it would take forever with the fastest processor to complete, unless you were to take advantage of all cores in your CPU.

parallel 'ffmpeg -v 0 -i "{}" -c:a libopus -b:a 128k "{.}.opus"' ::: $(find -type f -name '*.flac')

Transcoding Videos to VP9:

How to Change Open Files Limit on OS X and macOS

This text is the section about OS X Yosemite (which also works for macOS Sierra) from https://docs.basho.com/riak/kv/2.1.4/using/performance/open-files-limit/#mac-os-x

The last time i visited this link it was dead (403), so I cloned it here from the latest snapshot in Archive.org's Wayback Machine https://web.archive.org/web/20170523131633/https://docs.basho.com/riak/kv/2.1.4/using/performance/open-files-limit/

	cue_file = 'file.cue'

	d = open(cue_file).read().splitlines()

	general = {}

	tracks = []

	current_file = None

	// Phys monitor control via DDC/CI or VESA commands
	// (David Lowndes)
	// From https://social.msdn.microsoft.com/Forums/en-US/5437ddb8-af86-4cf0-8061-798e6601e08e/how-to-control-system-brightness-using-windows-api-?forum=windowsgeneraldevelopmentissues#554b7b7f-0aab-429d-9c36-fd39608979b0

	#include <Windows.h>
	#include <physicalmonitorenumerationapi.h>
	#include <highlevelmonitorconfigurationapi.h>
	#pragma comment( lib, "Dxva2.lib" )

	void

	uint16_t crc16(char* pData, int length)
	{
	uint8_t i;
	uint16_t wCrc = 0xffff;
	while (length--) {
	wCrc ^= (unsigned char )pData++ << 8;
	for (i=0; i < 8; i++)
	wCrc = wCrc & 0x8000 ? (wCrc << 1) ^ 0x1021 : wCrc << 1;
	}
	return wCrc & 0xffff;

	Windows Registry Editor Version 5.00

	[HKEY_CLASSES_ROOT\Directory\Background\shell\open_msys2]
	@="Open MSYS2 here"

	[HKEY_CLASSES_ROOT\Directory\Background\shell\open_msys2\command]
	@="c:\\msys64\\usr\\bin\\mintty.exe /bin/sh -lc 'cd \"$(cygpath \"%V\")\"; exec bash'"

	[HKEY_CLASSES_ROOT\Folder\shell\open_msys2]
	@="Open MSYS2 here"

	### PowerShell template profile
	### Version 1.03 - Tim Sneath <[email protected]>
	### From https://gist.github.com/timsneath/19867b12eee7fd5af2ba
	###
	### This file should be stored in $PROFILE.CurrentUserAllHosts
	### If $PROFILE.CurrentUserAllHosts doesn't exist, you can make one with the following:
	### PS> New-Item $PROFILE.CurrentUserAllHosts -ItemType File -Force
	### This will create the file and the containing subdirectory if it doesn't already
	###
	### As a reminder, to enable unsigned script execution of local scripts on client Windows,