BBC National re-config - Frankenstein stream

[andimik]

BBC National regularly uses re-configuration of the mux. It has been described first in https://www.rundfunkforum.de/viewtopic.php?f=11&t=55891&start=3330 (and following English language pages).

The issue is called Frankenstein stream due to a very strange output message (see below).

It's impossible to listen to the news (because the re-config is done exactly at the beginning of the hour) on some channels.

A raw file is see below (thanks to user DanDAB)

These services play without problems in welle.io

BBC Radio 1 (0xc221) Pri subch= 1 start= 0 CUs= 96 PL=uep 3 bitrate=128 BBC Radio 2 (0xc222) Pri subch= 2 start= 96 CUs= 96 PL=uep 3 bitrate=128 BBC Radio 3 (0xc223) Pri subch= 3 start=192 CUs=140 PL=uep 3 bitrate=192 (it's playing also with 160 kBit compared to Andi's DAB player)

There is no sound after re-config for

BBC Radio 4 (0xc224) Pri subch= 4 start=332 CUs= 96 PL=uep 3 bitrate=128 BBC Radio 5 Live (0xc225) Pri subch= 5 start=428 CUs= 58 PL=uep 3 bitrate=80 BBC Radio 1Xtra (0xc22a) Pri subch=10 start=582 CUs= 96 PL=uep 3 bitrate=128 BBC AsianNetwork (0xc236) Pri subch= 7 start=486 CUs= 48 PL=uep 3 bitrate=64 BBC WorldService (0xc238) Pri subch= 9 start=534 CUs= 48 PL=uep 3 bitrate=64 BBC Radio 4Extra (0xc22c) Pri subch=12 start=774 CUs= 58 PL=uep 3 bitrate=80 BBC Radio 6Music (0xc22b) Pri subch=11 start=678 CUs= 96 PL=uep 3 bitrate=128

See logfile attached welleio.log

[AlbrechtL]

Thanks for reporting. Please upload your file again.

[andimik]

Sorry for the delay, did not read your answer.

It's now on my homepage, so will not be deleted after 7 days.

http://andimik.bplaced.net/temp/12B_BBC%20National%20DAB_2020-07-27_095947.zip

[AlbrechtL]

Thanks for the file. Now I can reproduce the issue.

Do you know when the BBC will switch to DAB+?

[nickpiggott]

The reconfiguration process is entirely normal and part of the standard. In the run-up to reconfiguration, the new configuration is sent interleaved with the current configuration (for at least 15 frames prior to the change), and there's a frame counter to tell you exactly which frame to change over on. I wouldn't call it Frankenstein.

The BBC has never made any comment on a timeline for changing to DAB+. It's possible they'll be the last to change and only change some of their services.

[AlbrechtL]

@nickpiggott Thanks for your explanation. Because I'm living in Germany I'm not effected and thus this bug doesn't have high priority on my list.

But I will leave this issue open because we shall fix it.

Pull requests are welcome!