Tvheadend

When a streaming profile is set to use audio transcoding, if the original stream uses AAC, the resulting stream will contain no audio tracks.

Steps to reproduce:
1 - Create a streaming profile with audio transcoding (the target codec is not relevant)
2 - Assign the streaming profile created in 1) to your user
3 - Request a stream using your user
4 - Observe you won't get any audio

The log is as follows when the request arrives:
13:44:49.301 [ INFO] transcode: 0004: 1:H264 720x576 > H264 720x576 (libx264)
13:44:49.301 [ INFO] transcode: 0004: 2:AAC > VORBIS (libvorbis)
13:44:49.538 [ INFO] libav: Increasing reorder buffer to 1
13:44:49.597 [ INFO] libav: Increasing reorder buffer to 2
13:44:49.711 [ NOTICE] libav: using SAR=16/11
13:44:49.711 [ NOTICE] libav: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
13:44:49.713 [ NOTICE] libav: profile Main, level 3.0
13:44:49.714 [ NOTICE] libav: 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=4 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=8 lookahead_threads=8 sliced_threads=1 slices=8 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=25 keyint_min=2 scenecut=40 intra_refresh=0 rc_lookahead=0 rc=abr mbtree=0 bitrate=869 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=1000 vbv_bufsize=1835 nal_hrd=none filler=0 ip_ratio=1.41 aq=1:1.00
13:45:05.501 [ INFO] subscription: 0004: "HTTP" unsubscribing from "Channel 1", hostname="192.168.37.6", username="me", client="VLC/3.0.0-git LibVLC/3.0.0-git"
13:45:05.505 [ NOTICE] libav: frame I:18 Avg QP:10.96 size: 31887
13:45:05.505 [ NOTICE] libav: frame P:377 Avg QP:12.82 size: 3367
13:45:05.505 [ NOTICE] libav: mb I I16..4: 46.2% 0.0% 53.8%
13:45:05.505 [ NOTICE] libav: mb P I16..4: 4.5% 0.0% 0.5% P16..4: 27.6% 7.9% 2.8% 0.0% 0.0% skip:56.7%
13:45:05.505 [ NOTICE] libav: coded y,uvDC,uvAC intra: 57.8% 61.2% 32.4% inter: 10.3% 14.4% 0.5%
13:45:05.505 [ NOTICE] libav: i16 v,h,dc,p: 49% 17% 30% 5%
13:45:05.505 [ NOTICE] libav: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 21% 20% 4% 5% 5% 3% 5% 4%
13:45:05.505 [ NOTICE] libav: i8c dc,h,v,p: 61% 16% 20% 3%
13:45:05.505 [ NOTICE] libav: Weighted P-Frames: Y:0.0% UV:0.0%
13:45:05.505 [ NOTICE] libav: ref P L0: 77.4% 22.6%
13:45:05.505 [ NOTICE] libav: kb/s:933.27

Note: for every other input format I tested with, this worked for all target formats. The output stream will have audio. The problem seems to be present only when the broadcaster is sending an AAC audio stream

Setup details:
Tuner: SAT>IP Telestar Digibit R1
OS: Docker container based on Ubuntu 16:04

Is this a bug, or am I missing something?