salamanders’s gists

salamanders / dedupe.kts

Last active July 20, 2021 19:43

	// ~/Documents/kotlin/kotlinc/bin/kotlinc -script dedupe.kts -- -d /media/pi

	import java.io.File

	require(args.isNotEmpty()) { "kotlinc dedupe.kts [-d] [ROOT FILE PATH]" }
	val delete: Boolean = args[0] == "-d"
	val root: File = File(args.last()).canonicalFile
	require(root.exists() && root.isDirectory) { "Root must exist and be a directory: '$root'" }

	println("Starting in '$root'")

salamanders / convertvob.sh

Last active April 7, 2020 17:38

	find ./ -iname '*.VOB' -exec bash -c 'ffmpeg -f mpeg -i "{}" -c:a copy -c:v libx264 -crf 18 "{}".mp4' \;
	find ./ -iname '*.VOB.mp4' -exec bash -c 'scenedetect -i "{}" -o ./out detect-content -m 120 -t 40 split-video -c' \;

salamanders / test.kt

Created September 30, 2019 21:56

Kotlin Firestore API (Collection documentChanges) to Flow


	@ExperimentalCoroutinesApi
	fun CollectionReference.toFlow(): Flow<DocumentChange> = callbackFlow {
	val snapshotListener = this@toFlow.addSnapshotListener { snapshots, e ->
	if (e != null) {
	logger.error { "${this@toFlow.path} listen:error:$e" }
	cancel(CancellationException("Collection Listener Error in ${this@toFlow.path}", e))
	return@addSnapshotListener
	}
	for (dc in snapshots!!.documentChanges) {

salamanders / split_videos.sh

Last active August 21, 2019 20:37

Split a video by scene

	brew update && brew upgrade
	pip install --upgrade pip
	pip install scenedetect[opencv,progress_bar]
	mkdir out

	# Optionally tune the threshold, using the content_val column
	scenedetect -i clip1.mov -o ./out --stats my_video.stats.csv detect-content

	# Write the files
	scenedetect -i clip1.mov [...-i clip2.mov] -o ./out detect-content split-video --copy

salamanders / DoubleExponentialSmoothing.kt

Created April 10, 2019 20:09

Double Exponential Smoothing in Kotlin

	package info.benjaminhill.basicbot2

	import java.util.concurrent.ThreadLocalRandom


	/**
	* From https://geekprompt.github.io/Java-implementation-for-Double-Exponential-Smoothing-for-time-series-with-linear-trend/
	*
	* Performs double exponential smoothing for given time series.
	*

salamanders / Main.kt

Created March 31, 2019 02:52

Clipshow: Media (images and videos) to side-by-side movie

	/**
	* @author Benjamin Hill benjaminhill@gmail.com
	*/

	import mu.KotlinLogging
	import net.coobird.thumbnailator.Thumbnails
	import org.bytedeco.javacpp.avutil
	import org.bytedeco.javacpp.avutil.av_log_set_level
	import org.bytedeco.javacv.FFmpegFrameGrabber
	import org.bytedeco.javacv.FFmpegFrameRecorder

salamanders / ManualImage.kt

Created October 31, 2018 02:28

	import java.awt.image.BufferedImage
	import java.awt.image.DataBufferByte
	import java.awt.image.DataBufferInt

	/** Lots of alpha blurs looks bad using regular images */
	class ManualImage(private val width: Int, private val height: Int) {
	private val red = IntArray(width * height)
	private val green = IntArray(width * height)
	private val blue = IntArray(width * height)
	private var numAdded = 0

salamanders / speedup.sh

Last active June 25, 2023 22:45

Speed up video 64x with frame blending/averaging using ffmpeg

	# Simple 4x speedup, force to 60fps.
	/c/bin/ffmpeg/bin/ffmpeg.exe -r 60 -i thefile.mkv -vf "tblend=average,framestep=2,tblend=average,framestep=2,setpts=0.25*PTS" -r 60 -c:v mpeg4 -q:v 1 -an thefile_4x.mp4


	# Force input to 60fps. blend 16, and pick 1 of each 16. (do we do extra work for the other 15?) Set PTS to 1/16th of "original". Encode very high quality.
	ffmpeg -r 60 -i molt.mp4 \
	-vf "crop=in_h:in_h,tmix=frames=16:weights='1',select='not(mod(n\,16))',setpts=0.0625*PTS" \
	-c:v libx265 -crf 18 -an molt16.mp4

	# I still like the original. Match the "-r NN" to the source frame rate.

salamanders / Ezcam.kt

Created August 14, 2018 20:55

Deconstructed Camera2

	package info.benjaminhill.cameratest

	import android.Manifest
	import android.annotation.SuppressLint
	import android.app.Activity
	import android.content.Context
	import android.content.pm.PackageManager
	import android.graphics.ImageFormat
	import android.graphics.SurfaceTexture
	import android.hardware.camera2.*

salamanders / EZPermissionActivity.kt

Last active August 1, 2018 23:17

Hello World Timer Camera using CameraKit

	package info.benjaminhill.snailfps

	import android.content.pm.PackageManager
	import android.os.Bundle
	import android.support.v4.app.ActivityCompat
	import android.support.v4.content.ContextCompat
	import android.support.v7.app.AppCompatActivity
	import android.util.Log
	import android.widget.Toast

Benjamin Hill salamanders