https://wiki.johnharrison.cc/ 2026-05-01T18:57:19+00:00 https://wiki.johnharrison.cc/ https://wiki.johnharrison.cc/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2025-01-08T02:46:48+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=lwc:multimedia_and_graphics:audio_generation&rev=1736304408&do=diff AI generative audio Samples * Harmonai sample generator * Harmonai main website * getting started (official, 2 min) * explanatory video * finetuning Song Generation * Suno * Soundraw is good for generating background music for videos or whatever * Stable Audio generates sounds and Stable Audio Open generates samples * Install Stable Audio locally text/html 2023-08-05T15:12:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=lwc:multimedia_and_graphics:computer_vision&rev=1691248328&do=diff Roboflow * Roboflow: tools and tutorials to build computer vision models * getting started * bird detection dataset and live model * comparison of computer vision models brought to you by Roboflow * Supervision: reusable computer vision tools, such as loading dataset, drawing detections, counting, etc. Another Roboflow product. * tracking and counting objects using YOLOv8 also by Roboflow text/html 2025-01-23T16:26:45+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=lwc:multimedia_and_graphics:downloading&rev=1737649605&do=diff Youtube download * yt-dlp seems to work a lot better than youtube-dl * download all videos in a playlist: yt-dlp -i <playlist> * get just mp3 from download yt-dlp -x --audio-format mp3 <URL> * fixing: ERROR: [youtube] na47wMFfQCo: Sign in to confirm you’re not a bot. This helps protect our community. Learn more text/html 2020-11-27T01:38:18+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=lwc:multimedia_and_graphics:inkscape&rev=1606441098&do=diff export a single layer (from the command line) http://stackoverflow.com/questions/9652573/inkscape-command-line-programming the verb command doesn't allow parameters and when using verb you will always get the gui. text/html 2022-11-27T18:23:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=lwc:multimedia_and_graphics:realtime&rev=1669573426&do=diff Creating a video loopback device (Linux) * v4l2loopback works in ubuntu 20.04 but the binary needs to be compiled: * get the headers for the kernel version you are using * from the package manager install v4l2loopback-source * cd /usr/src/v4l2loopback-0.12.3/ text/html 2022-09-09T15:35:35+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=lwc:multimedia_and_graphics:streaming&rev=1662737735&do=diff Streaming with nginx Send a stream to nginx: ffmpeg -re -f video4linux2 -i /dev/video0 -vcodec libx264 -vprofile baseline -acodec none -x264-params keyint=30:scenecut=0 -strict -2 -f flv -pix_fmt yuv420p rtmp://<ip address>/show/stream * /show/stream is the stream url text/html 2024-02-14T01:50:18+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=lwc:multimedia_and_graphics:transcoding&rev=1707875418&do=diff transcode: Stablization can be done using transcode as outlined here and with more detail here. It's a 2-step process: create a .trf file with the information needed for transcoding:  transcode -J stabilize=shakiness=1 -i test.mp4 * shakiness is a number from 1 - 10. 10 means the video is really shaky so apply the filter with full force. 1 means don't do munch. Default is 5 and works well.  text/html 2020-11-27T01:39:54+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=lwc:multimedia_and_graphics:wacom&rev=1606441194&do=diff Using Wacom Cintiq 15x in ubuntu 12.04 for some reason if screen is rotated, twinview (separate x instances for each screen) will not work. when using 2 screens and no twinview, xinput_calibrator will not work correctly identify the device id: xinput