Tvheadend

I'm trying to set up tvheadend to transcode to an AAC stream. I can stream raw with no problem, but when I try to use any transcoding stream profile other than MPEG-TS Pass-through - I get nothing
I ran with --trace transcode,libav,codec,webui,service,avahi,subscription,access to get the trace below, is this enough?

I compiled upstream master, with the following config
./configure --enable-libav --enable-ffmpeg_static --enable-debugging --enable-libfdkaac --enable-libfdkaac-static

Is there anythign else I can do to debug the problem, and/or did I miss something obvious?

2024-02-01 22:52:39.550 [ TRACE] subscription: 0004: creating subscription for BBC R4 FM weight 0 using profile aac
2024-02-01 22:52:39.550 [ TRACE] subscription: 0004: find service for BBC R4 FM weight 100
2024-02-01 22:52:39.550 [ DEBUG] service: 4: BBC R4 FM si 0x7f908800c9f0 Conexant CX24117/CX24132 : DVB-S #0 weight 0 prio 10 error 0 (OK)
2024-02-01 22:52:39.550 [ DEBUG] service: 3: BBC R4 FM si 0x7f90880048d0 Conexant CX24117/CX24132 : DVB-S #1 weight 0 prio 10 error 0 (OK)
2024-02-01 22:52:39.550 [ TRACE] service: will start new instance 3
2024-02-01 22:52:39.550 [ TRACE] service: starting FreeSat/10803H/BBC R4 FM
2024-02-01 22:52:39.550 [ INFO] mpegts: 10803H in FreeSat - tuning on Conexant CX24117/CX24132 : DVB-S #1
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: linking sub 0x7f9058001bc0 to svc 0x55786b0541d0 type 0
2024-02-01 22:52:39.799 [ INFO] subscription: 0004: "HTTP" subscribing on channel "BBC R4 FM", weight: 100, adapter: "Conexant CX24117/CX24132 : DVB-S #1", network: "FreeSat", mux: "10803H", provider: "BSkyB", service: "BBC R4 FM", profile="aac", hostname="192.168.40.170", client="Wget"
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 01: input
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 02: parser input
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 03: profile queue input
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 04: profile input
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 05: tsfix input
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 06: transcoder input
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 07: profile sharer input
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 08: globalheaders input
2024-02-01 22:52:39.799 [ TRACE] subscription: 0004: chain 09: streaming queue 0x7f90871f7238 size 0
2024-02-01 22:52:40.568 [ DEBUG] service: FreeSat/10803H/BBC R4 FM: Status changed to [Hardware input]
2024-02-01 22:52:40.568 [ DEBUG] service: FreeSat/10803H/BBC R4 FM: Status changed to [Hardware input] [Input on service]
2024-02-01 22:52:40.568 [ DEBUG] service: FreeSat/10803H/BBC R4 FM: Status changed to [Hardware input] [Input on service] [Demuxed packets]
2024-02-01 22:52:40.568 [ DEBUG] service: FreeSat/10803H/BBC R4 FM: Status changed to [Hardware input] [Input on service] [Demuxed packets] [Reassembled packets]
2024-02-01 22:52:40.569 [ INFO] transcode: 0004: 01:MPEG2AUDIO: ==> Using profile aac
2024-02-01 22:52:59.806 [WARNING] webui: Stop streaming /stream/channelname/BBC%20R4%20FM, timeout waiting for packets

Thanks for your help in advance

Cheers
Mark.