How to split file when either transcoding or recording?

[renzska]

I'm wondering what the best way is to split one file into smaller files during transcoding and during recording.  I need both methods because my software allows both methods.

For the recording, I can do the split by starting a new recording at the specified interval, but I was wondering if there was a better way to do it post recording?

Is it possible to do this when transcoding and if so, how?

Thanks,

John

[Ian @ un4seen]

You could use BASS_SYNC_POS syncs to achieve what you want, eg. set a sync at a point that you want to split the encoding, and then in your callback function, stop the old encoder and start a new one. That can be applied to both recording and transcoding. It could look something like this...

Code Select Expand

QWORD syncbyte=BASS_ChannelSeconds2Bytes(handle, synctime); // byte position to sync/split at
BASS_ChannelSetSync(handle, BASS_SYNC_POS|BASS_SYNC_MIXTIME, syncbyte, SplitSyncProc, NULL); // set a mix-time POS sync there

...

void CALLBACK SplitSyncProc(HSYNC handle, DWORD channel, DWORD data, void *user)
{
BASS_Encode_Stop(channel); // stop the old encoder
BASS_Encode_Start(channel, ...); // start a new one
}


[Couin]

Hi Ian,

Google gave me this topic for my "split record file un4seen" search.
Will stopping and starting a new recording, make some little missing (not recorded, between stop first and start second) part of audio ?

Thanks

[Ian @ un4seen]

If you want the file splits to be seamless (so they sound perfect when rejoined) then you should only restart the encoder, not the recording. You could do that using BASS_SYNC_POS syncs (like in the post above) if you need the splits at exact intervals, or otherwise you could use BASS_ChannelLock to lock the recording while restarting the encoder. To minimize the lock time, you could start the new encoder in a paused state first:

Code Select Expand

newencoder = BASS_Encode_Start(recording, cmdline, BASS_ENCODE_PAUSE, NULL, NULL); // start the new encoder in paused state
BASS_ChannelLock(recording, true); // lock the recording
BASS_Encode_Stop(oldencoder); // stop the old encoder
BASS_Encode_SetPaused(newencoder, false); // unpause the new encoder
BASS_ChannelLock(recording, false); // unlock the recording

BASS_Encode_Start can be replaced with one of the format-specific variants, eg. BASS_Encode_StartPCM or BASS_Encode_OGG_Start.