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lass.pds.lassul.us/superconfig
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add video-webcam tool and fix android-webcam lsmod check
video-webcam: stream video/gif files to v4l2loopback with proper
aspect ratio handling (letterboxing instead of cropping)
android-webcam: remove lsmod check that failed in nix wrapper,
use device file checks instead
author
lassulus
date
(Jan 17, 2026, 10:57 AM CET)
commit
4aad3cd9
4aad3cd93b217bc5135aef04f51c440be1460e6d
parent
0965092a
0965092a09e4b4d7a1cbbf3eed799d74a850013f
+97
-12
+2
-11
tools/android-webcam/android-webcam.sh
+2
-11
tools/android-webcam/android-webcam.sh
···
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#!/usr/bin/env bash
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SHADER_PATH="@shaderPath@"
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ASCII_MODE=false
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···
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esac
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done
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# Check if v4l2loopback module is loaded
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if ! lsmod | grep -q v4l2loopback; then
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echo "Error: v4l2loopback kernel module is not loaded" >&2
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echo "Make sure you have rebooted after enabling the android-webcam module" >&2
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exit 1
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fi
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-
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if $ASCII_MODE; then
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# ASCII mode needs both devices
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if [[ ! -e /dev/video0 ]] || [[ ! -e /dev/video1 ]]; then
···
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cleanup() {
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echo "Stopping..."
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kill $SCRCPY_PID 2>/dev/null || true
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[[ -n "${FFMPEG_PID:-}" ]] && kill $FFMPEG_PID 2>/dev/null || true
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kill "${SCRCPY_PID}" 2>/dev/null || true
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[[ -n "${FFMPEG_PID:-}" ]] && kill "${FFMPEG_PID}" 2>/dev/null || true
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}
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trap cleanup EXIT
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-1
tools/android-webcam/flake-module.nix
-1
tools/android-webcam/flake-module.nix
+14
tools/video-webcam/flake-module.nix
+14
tools/video-webcam/flake-module.nix
+81
tools/video-webcam/video-webcam.sh
+81
tools/video-webcam/video-webcam.sh
···
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DEVICE="/dev/video0"
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LOOP=true
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usage() {
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echo "Usage: video-webcam [OPTIONS] <video-file>"
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echo ""
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echo "Stream a video file to a virtual webcam device."
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echo ""
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echo "Options:"
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echo " -d, --device DEVICE v4l2 device to use (default: /dev/video0)"
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echo " --no-loop Don't loop the video"
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echo " -h, --help Show this help"
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echo ""
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echo "Examples:"
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echo " video-webcam funny.gif"
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echo " video-webcam -d /dev/video1 background.mp4"
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echo " video-webcam --no-loop intro.webm"
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}
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while [[ $# -gt 0 ]]; do
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case $1 in
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-d|--device)
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DEVICE="$2"
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shift 2
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;;
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--no-loop)
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LOOP=false
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shift
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;;
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-h|--help)
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usage
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exit 0
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;;
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-*)
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echo "Unknown option: $1" >&2
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usage >&2
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exit 1
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;;
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*)
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VIDEO_FILE="$1"
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shift
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;;
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esac
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done
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if [[ -z "${VIDEO_FILE:-}" ]]; then
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echo "Error: No video file specified" >&2
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usage >&2
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exit 1
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fi
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if [[ ! -f "$VIDEO_FILE" ]]; then
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echo "Error: File not found: $VIDEO_FILE" >&2
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exit 1
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fi
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if [[ ! -e "$DEVICE" ]]; then
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echo "Error: Device $DEVICE does not exist" >&2
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echo "Make sure v4l2loopback kernel module is loaded" >&2
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exit 1
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fi
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echo "Streaming '$VIDEO_FILE' to $DEVICE"
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if $LOOP; then
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echo "Looping enabled (Ctrl+C to stop)"
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fi
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echo ""
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LOOP_ARG=""
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if $LOOP; then
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LOOP_ARG="-stream_loop -1"
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fi
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# shellcheck disable=SC2086
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exec ffmpeg \
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$LOOP_ARG \
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-re \
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-i "$VIDEO_FILE" \
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-vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,format=yuv420p" \
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-f v4l2 \
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"$DEVICE"