Universal Source functions

[MrC]

For my project AVStoDVD, I am trying to write a couple of fuctions (video and audio sources) that combine well known general purpose Source methods:

# Following AviSynth plugins are required:
#  FFMpegSource.dll @ http://forum.doom9.org/showthread.php?t=127037
#  GetSystemEnv.dll @ http://avisynth.org/stickboy

LoadPlugin("FFMpegSource.dll")
LoadPlugin("GetSystemEnv.dll")


Function A2DVideoSource(string VideoSource, bool "debug")
{
debug = default(debug, false)
Try {
SourceStr = "A2DVideoSource: AVISource"
Video = AVISource(VideoSource, audio = false)
}
Catch(Err_Msg) {
	Try {
	SourceStr = "A2DVideoSource: DirectShowSource"
	Video = DirectShowSource(VideoSource, convertfps = true, audio = false)
	}
	Catch(Err_Msg) {
		SourceStr = "A2DVideoSource: FFmpegSource"
		Video = FFmpegSource(VideoSource, vcachefile = GetSystemEnv("temp") + "\A2DVideoSource.cache", seekmode = 0)
	}
}
Video = (debug == true) ? Subtitle(Video.Info(), SourceStr, font = "courier new", size = 16, align = 1) : Video
return(Video)
}


Function A2DAudioSource(string AudioSource)
{
Try {
Audio = DirectShowSource(AudioSource, video = false)
}
Catch(Err_Msg) {
	Audio = FFAudioSource(AudioSource, atrack = -1, acachefile = GetSystemEnv("temp") + "\A2DAudioSource.cache", acachefile2 = GetSystemEnv("temp") + "\A2DAudioSource2.cache")
}
return(Audio)
}

I am not a great AviSynth scripter, any suggestion how to improve it will be appreciated.



Bye