save sdm files into a single mdm file to do gss

[yuekaizhang]

No description provided.

[desh2608]

I see what you're trying to get at, but I think there may be a more elegant solution which does not need running sox commands during data preparation. You can create a Recording object which has multiple AudioSources, possibly 1 per microphone channel. Then, if you call load_audio with the specified channels, it would load only those channels. This is better in 2 ways:

1. data is not duplicated
2. you can load any combination of channels from the recording

As an example, I would suggest looking at the mdm preparation in ICSI: https://github.com/lhotse-speech/lhotse/blob/master/lhotse/recipes/icsi.py

[yuekaizhang]

I see what you're trying to get at, but I think there may be a more elegant solution which does not need running sox commands during data preparation. You can create a Recording object which has multiple AudioSources, possibly 1 per microphone channel. Then, if you call load_audio with the specified channels, it would load only those channels. This is better in 2 ways:

1. data is not duplicated
2. you can load any combination of channels from the recording

As an example, I would suggest looking at the mdm preparation in ICSI: https://github.com/lhotse-speech/lhotse/blob/master/lhotse/recipes/icsi.py

Done, thanks.

[desh2608]

Some minor comments, otherwise LGTM.