Doom9's Forum - View Single Post - GUIDE LIST: Stereo-to-Surround Conversion Guides

FranceBB · 9th June 2016, 16:27

@HaydenField000... it's possible to convert stereo to surround 5.1 via avisynth, using these filters (try them and choose one according to the results on your source):

UpAction() #action movies only
UpDialog() #dialogues mainly
UpGerzen()
UpFarina()
UpMultisonic()
UpSoundOnSound()

Once you have a 5.1 converted track, you'll just have to encode it using your favourite encoder, for instance, NeroAAC.

Sample script:

Code:

video=colorbars(width = 704, height = 396, pixel_type = "yv12")

audio=DirectShowSource("audio2.0.something")
#using WAVSource for .wav audio files is reccomend
#you can use FFAudioSource as well

audioDub(video, audio)

UpDialog() #it converts to 5.1

Please note that upmix it's not like a real 5.1 audio track, due to potential unexpected behaviours, 'cause it uses filters to detect frequencies and create channels, so you might have a light echo in FL and FR channels during dialogues, when they are supposed to be mute in a real 5.1 track etc.
Unfortunately, there is no magic and I really wanted to upmix audio tracks back in the days, but in most cases it's not worth it and it's better to just make a Loudness correction (Normalization, EQ etc).

9th June 2016, 16:27	#12 \| Link
FranceBB Broadcast Encoder Join Date: Nov 2013 Location: Royal Borough of Kensington & Chelsea, UK Posts: 2,902	@HaydenField000... it's possible to convert stereo to surround 5.1 via avisynth, using these filters (try them and choose one according to the results on your source): UpAction() #action movies only UpDialog() #dialogues mainly UpGerzen() UpFarina() UpMultisonic() UpSoundOnSound() Once you have a 5.1 converted track, you'll just have to encode it using your favourite encoder, for instance, NeroAAC. Sample script: Code: video=colorbars(width = 704, height = 396, pixel_type = "yv12") audio=DirectShowSource("audio2.0.something") #using WAVSource for .wav audio files is reccomend #you can use FFAudioSource as well audioDub(video, audio) UpDialog() #it converts to 5.1 Please note that upmix it's not like a real 5.1 audio track, due to potential unexpected behaviours, 'cause it uses filters to detect frequencies and create channels, so you might have a light echo in FL and FR channels during dialogues, when they are supposed to be mute in a real 5.1 track etc. Unfortunately, there is no magic and I really wanted to upmix audio tracks back in the days, but in most cases it's not worth it and it's better to just make a Loudness correction (Normalization, EQ etc). Last edited by FranceBB; 9th June 2016 at 16:30.