kilko.de - TIL

Importing CSV data into SQLite

2026-07-01T00:00:00+00:00

Creating a table from CSV data is very straightforward.</p>

sqlite3</span> file.sqlite</span></span>
sqlite</span>></span> .mode</span> csv</span></span>
sqlite</span>></span> .import</span> data.csv</span> tablename</span></span>
sqlite</span>></span> .exit</span></span></code></pre>
That's it.</p>



Youtube RSS Feeds
2026-03-23T00:00:00+00:00
Any channel can be subscribed to via RSS by using the following URL format:</p>
https://www.youtube.com/feeds/videos.xml?channel_id=CHANNEL_ID</span></span></code></pre>
The easiest way to get this is to just let your RSS Reader subscribe to the channel's main URL, it will usually figure out the feed location.</p>
The default feed includes all</em> videos however, this includes live videos and shorts, there's a few different playlist feeds that can be used to filter these out, instead of using the channel_id</code> parameter, use the playlist_id</code> parameter like so:</p>
https://www.youtube.com/feeds/videos.xml?playlist_id=PLAYLIST_ID</span></span></code></pre>
The playlist ID is the same as the channel ID (which includes the UC</code> prefix), but with a different prefix:</p>

All videos: UU</code> + rest of channel ID</li>
Standard videos: UULF</code> + rest of channel ID</li>
Shorts: UUSH</code> + rest of channel ID</li>
Livestreams: UULV</code> + rest of channel ID</li>
</ul>
For example, the feed URL for stuffmadehere's channel would be transformed like this to get only standard videos:</p>
https://www.youtube.com/feeds/videos.xml?channel_id=UCj1VqrHhDte54oLgPG4xpuQ</span></span>
-></span></span>
https://www.youtube.com/feeds/videos.xml?playlist_id=UULFj1VqrHhDte54oLgPG4xpuQ</span></span></code></pre>
Kudos to github.com/FreshRSS/Extensions/issues/234#issuecomment-2738509387</a></p>


Change video container
2025-08-20T00:00:00+00:00
Quickly change a file's container using magic</em> shell syntax.</p>
ffmpeg</span> -</span>i</span> path/to/file.{webm,</span> mp4}</span></span></code></pre>


Concatenate videos
2025-08-20T00:00:00+00:00
Concating several video files with ffmpeg is very straightforward if they all share the same container and codec.
Add all input files to a text file listing their relative or absolute paths.</p>
file</span> '</span>file1.mp4</span>'</span></span>
file</span> '</span>file2.mp4</span>'</span></span>
.</span>.</span>.</span></span></code></pre>
Run the following.</p>
$</span> ffmpeg</span> -</span>f</span> concat</span> -</span>safe</span> 0</span> -</span>i</span> input.txt</span> -</span>c</span> copy</span> output.mp4</span></span></code></pre>
-safe 0</code> can be omitted if the filepaths are relative.</p>


Create video from image and audio
2025-08-20T00:00:00+00:00
Technically something simple along the following lines would work.</p>
ffmpeg</span> -</span>i</span> image.png</span> -</span>i</span> audio.mp3</span> video.mp4</span></span></code></pre>
This does however create a file with just a single frame, which doesn't really work on YouTube for example. The following creates a video with repeating frames.</p>
ffmpeg</span> -</span>r</span> 1</span> -</span>loop</span> 1</span> -</span>i</span> image</span>.</span>png</span> -</span>i</span> audio</span>.</span>mp3</span> -</span>acodec</span> copy</span> -</span>shortest</span> -</span>vf</span> scale</span>=</span>1280</span>:</span>720</span> video</span>.</span>mp4</span></span></code></pre>
Credits go to superuser.com/a/1041820/236423</a></p>


Keep subtitles while transcoding
2025-08-20T00:00:00+00:00
To keep all existent subtitle tracks when transcoding media with ffmpeg, just pass the flag -map 0:s -c copy</code>, e.g.</p>
$</span> ffmpeg</span> -</span>i</span> /path/to/media.{mkv,mp4}</span> -</span>map</span> 0:s</span> -</span>c</span> copy</span></span></code></pre>


Rotate videos
2025-08-20T00:00:00+00:00
Rotate videos using ffmpeg by transposing them. The command to do so is:</p>
$</span> ffmpeg</span> -</span>i</span> input.mp4</span> -</span>vf</span> "</span>transpose=1</span>"</span> output.mp4</span></span></code></pre>
The possible rotations are the following.</p>
0 = 90CounterCLockwise and Vertical Flip (default)</span></span>
1 = 90Clockwise</span></span>
2 = 90CounterClockwise</span></span>
3 = 90Clockwise and Vertical Flip</span></span></code></pre>
Use -vf "transpose=2,transpose=2"</code> for 180 degrees.</p>
Credits go to stackoverflow.com/a/9570992/1843020</a></p>


Simulating a scan
2018-09-01T00:00:00+00:00
Fake a printed, hand-signed and scanned document using imagemagick. Beat the bureucracy.</p>
$</span> convert</span> input.pdf</span> -</span>colorspace</span> gray</span> \(</span> +clone</span> -</span>blur</span> 0x0.1</span> \)</span> +swap</span> -</span>compose</span> divide</span> -</span>composite</span> -</span>linear-stretch</span> 5%x0%</span> -</span>rotate</span> 0.5</span> scan.pdf</span></span></code></pre>
Documentation on using -blur</code> can be found here</a>.</p>
Credits go to tex.stackexchange.com/a/94541</a></p>