TubeTutor

#
# Wrapper for the ffmpeg utilities
#
# Default search path is relatively to the main script that is called:
# <script path>/ffmpeg
#
# Otherwise, the windows search path is used
#
import subprocess
import platform
import ctypes
import signal
import sys
import os
import re

#font="Arial"
font=os.path.join("media", "Roboto-Regular.ttf")
proc_ffmpeg=None

if platform.system() == "Linux":
	grabber="-video_size 1920x1080 -f x11grab -framerate 20 -i :0.0"
else:
	grabber="-f gdigrab -framerate 20 -i desktop"

#
# The following helper functions will retrieve the pathnames for the ffmpeg tools
#
def get_cmd_ffmpeg():
	subdir=os.path.join(os.path.dirname(sys.argv[0]), "ffmpeg")
	if os.path.exists(subdir):
		return os.path.join(subdir, "ffmpeg.exe")
	return "ffmpeg"

def get_cmd_ffprobe():
	subdir=os.path.join(os.path.dirname(sys.argv[0]), "ffmpeg")
	if os.path.exists(subdir):
		return os.path.join(subdir, "ffprobe.exe")
	return "ffprobe"

def get_cmd_convert():
	subdir=os.path.join(os.path.dirname(sys.argv[0]), "imagemagick")
	if os.path.exists(subdir):
		return os.path.join(subdir, "convert.exe")
	return "convert"

def is_recording():
	return proc_ffmpeg != None

def convert_image(input, output, params):
	global font
	cmd = get_cmd_convert()
	cmd += " " + input
	cmd += " " + params
	cmd += " " + output
	print ("====================================================")
	print ("cmd: %s" % cmd)
	p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
	(out, error) = p.communicate()
	print("output:\n%s" % out)
	print("error:\n%s" % error)

def start(filename, params):
	global proc_ffmpeg

	# Kill remaining ffmpeg instances
	stop()
	# execute ffmpeg cmd
	cmd = get_cmd_ffmpeg()
	cmd += " " + params
	cmd += " " + filename
	print ("====================================================")
	print ("cmd: %s" % cmd)
	if platform.system() == "Linux":
		proc_ffmpeg = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True, preexec_fn=os.setsid)
	else:
		proc_ffmpeg = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)

def record(filename, resolution=""):
	if resolution != "":
		start(filename, " %s -y -vf scale=%s -v:q 1" % (grabber, resolution))
	else:
		start(filename, " %s -y -v:q 1" % (grabber))

def stop():
	global proc_ffmpeg
	# Kill remaining ffmpeg instances
	if proc_ffmpeg:
		try:
			ctypes.windll.kernel32.TerminateProcess(int(proc_ffmpeg._handle), -1)
		except:
			os.killpg(os.getpgid(proc_ffmpeg.pid), signal.SIGTERM)
		proc_ffmpeg.kill()
		proc_ffmpeg=None
		
def video_duration(filename):
	cmd = get_cmd_ffprobe()
	cmd += " -i %s" % filename
	cmd += " -show_entries format=duration"
	print ("====================================================")
	print ("cmd: %s" % cmd)
	p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
	(output, error) = p.communicate()
	print("duration output: %s - %s" % (output, error))
	durations = re.findall(r'duration=[0-9.]*', str(output))
	for d in durations:
		duration = d.split("=")[1]
		print("duration string: %s" % duration)
		print("duration: %f" % float(duration))
		return float(duration)

def wait():
	global proc_ffmpeg
	if proc_ffmpeg:
		(out, error) = proc_ffmpeg.communicate()
		print("output:\n%s" % out)
		print("error:\n%s" % error)
		proc_ffmpeg = None

class renderer:
	pconcat=""
	nconcat=0
	vidfilter=[]
	vidresolution=""
	lastfilename=""
	tmppath=""
	framerate=20
	qfilter=" -v:q 1 "

	def __init__(self):
		self.tmppath = os.path.join("videos", "tmp")
		self.framerate = 20
		
	def add_text(self, filename, duration=5):
		f = open(filename, "r")
		if f:
			content = f.read()
			f.close()
		if content.replace("\n", "") == "":
			return

		params = " -scale %s!" % self.vidresolution.replace(":", "x")
		params += " -font %s -weight 500 -pointsize 75" % font
		params += " -draw \"gravity northwest fill white text 100,650 '%s'\"" % content
		params += " -scale %s!" % self.vidresolution.replace(":", "x")
		image = os.path.splitext(filename)[0] + ".png"
		convert_image(os.path.join("media", "back.png"), image, params)
		self.add_image(image, duration)
		return content
	
	def add_image(self, filename, duration=5, fadein=True):
		print(self.tmppath)
		tmpimage = os.path.join(self.tmppath, os.path.basename(filename) + ".png")
		tmpfilename = os.path.join(self.tmppath, os.path.basename(filename) + ".mkv")
		params = " -scale %s!" % self.vidresolution.replace(":", "x")
		convert_image(filename, tmpimage, params)

		params = " -y -loop 1 -t %d -i %s" % (duration, tmpimage)
		if fadein:
			params += " -filter_complex \"fade=in:0:d=1[v];[v]fade=out:st=%f:d=2\"" % ((duration-2))
		else:
			params += " -filter_complex \"fade=out:st=%f:d=1\"" % ((duration-3))
		params += self.qfilter
		start(tmpfilename, params)
		wait()

		self.pconcat += " -i %s" % (tmpfilename)
		self.nconcat+=1
	
	def add_video(self, filename):
		# fade video temporarily
		tmpfilename = os.path.join(self.tmppath, "add_" + os.path.basename(filename))
		(w,h) = self.vidresolution.split(":")
		params = " -y -i %s -filter_complex \"scale=-1:%s[v];[v]crop=%s:0:0[v];[v]fade=in:0:10\"" % (filename, h, self.vidresolution)
		params += self.qfilter
		start(tmpfilename, params)
		wait()
		
		self.pconcat += " -i %s" % (tmpfilename)
		self.nconcat+=1

	def speedup(self, filename, pts=0.7):
		params = " -i %s -y -filter:v \"setpts=%f*PTS\"" % (self.lastfilename, pts)
		params += self.qfilter
		self.lastfilename = filename
		start(filename, params)
		wait()

	def mux(self, filename, audiofile):
		duration = video_duration(self.lastfilename)
		params = " -i %s -i %s -y" % (self.lastfilename, audiofile)
		params += " -t %d" % (int(duration)+1)
		params += " -af \"afade=out:st=%f:d=3\"" % (duration-3.0)
		params += " -map 0:v:0 -map 1:a:0"
		params += self.qfilter
		self.lastfilename = filename
		start(filename, params)
		wait()

	def filter(self, filter):
		self.vidfilter = filter

	def resolution(self, resolution):
		self.vidresolution = resolution

	def concat(self, filename, audio=False):
		if self.lastfilename != "":
			self.nconcat += 1
			self.pconcat = "-i %s %s " % (self.lastfilename, self.pconcat)

		if audio:
			a=1
		else:
			a=0
		if len(self.vidfilter) > 0:
			params = self.pconcat + " -y -filter_complex \"concat=n=%d:v=1:a=%d,%s\"" % (a, self.nconcat, ",".join(self.vidfilter))
		else:
			params = self.pconcat + " -y -filter_complex concat=n=%d:v=1:a=%d" % (self.nconcat, a)
		self.lastfilename = filename
		params += self.qfilter
		start(filename, params)
		wait()

	def filename(self, filename):
		self.lastfilename = filename

	def framerate(self, framerate):
		self.framerate = framerate

	def tmppath(self, path):
		self.tmppath = path

	def process(self, filename, param):
		print("process %s -> %s" % (self.lastfilename, filename))
		params = " -y -i %s %s " % (self.lastfilename, param)
		self.lastfilename = filename
		params += self.qfilter
		start(filename, params)
		wait()