Creating a 5.1 audio from a 2.0 Surround

[ernnnn]

Hi!

I'm trying to "create" a 5.1 audio from a 2.0 surround. I've tried three different methods.

1. Using the 2 wavs to complete the rest of channels. Not a good idea as you hear the voices on the rear speakers, being "weird".
2. Upmixing with, for example, BeHappy, but the result is also not "ideal".
3. Using the channels from the English track to complete the missing channels on the Spanish 2.0. The problem is, even low, you can still listen to the conversation in English on the rears at the same time as the Spanish voices on the front. I've tried ilencing those parts with voices, but apart from being a very tricky procedure, there is always something there I didn't notice.

Any ideas?

Thanks in advance!

[pandy]

Easiest - search for English 5.1 version if this is not possible i would try to subtract Spanish voice from surround channels.
And you can try this http://forum.doom9.org/showthread.php?t=83752

Btw if your source is Dolby Prologic or Prologic II then perhaps upmixing is also possible..

[ernnnn]

Easiest - search for English 5.1 version if this is not possible i would try to subtract Spanish voice from surround channels.
And you can try this http://forum.doom9.org/showthread.php?t=83752

If you read carefully the third method I have already tried, I have the 5.1 English version of the audio, but if I use the channels not presented on the Spanish 2.0, there are distant English voices to be heard on some parts of the track that can be heard clearly on rear speakers. So I cannot use those channels as I cannot silent those voices properly as they are here and there and mostly everywhere.

[netmask56]

Technically you can't achieve what you are attempting as the additional information is simply not present in the stereo tracks you have. You are also highly dependent on how the original sound mixer assigned tracks in the 5.1English mix. Often there is quite a bit of blending between tracks that cannot simply be removed or reassigned. You could separate out the individual tracks and do quite a bit of editing to remove by brute force any instance of English and then cover the hole with a suitable background atmos. Finally assign your edited rear tracks to your final 5.1 mix.

[pandy]

Easiest - search for English 5.1 version if this is not possible i would try to subtract Spanish voice from surround channels.
And you can try this http://forum.doom9.org/showthread.php?t=83752

If you read carefully the third method I have already tried, I have the 5.1 English version of the audio, but if I use the channels not presented on the Spanish 2.0, there are distant English voices to be heard on some parts of the track that can be heard clearly on rear speakers. So I cannot use those channels as I cannot silent those voices properly as they are here and there and mostly everywhere.

You can try to cancel voices - usually they are mixed in a way to be in same proportions on both channels so subtracting channel should remove voice. There is many possibilities how to workaround this.

[ProWo]

Try this

FFmpeg.exe -i "your_stereo_audio" -af pan="5.1|c0=c0|c1=c1|c2=0.5*c0+0.5*c1|c3=0.4*c0+0.4*c1|c4=0.4*c0|c5=0.4*c1" -c:a ac3 -b:a 192k -ar 48000 "your_5-1_audio.ac3"

[pandy]

Seem newer ffmpeg is equipped with dedicated filter to perform such upmixing - i would give a chance to https://ffmpeg.org/ffmpeg-filters.html#surround

[ProWo]

Seem newer ffmpeg is equipped with dedicated filter to perform such upmixing - i would give a chance to https://ffmpeg.org/ffmpeg-filters.html#surround

Thank you, I didn't know the filter yet

[ProWo]

You can use the new release (v3.2.5) of clever FFmpeg-GUI.
I've added the ffmpeg surround filter (see post #7, thx to pandy). Set 2 to 5.1 (channels select) and click encode.