shaka-packager doesn't recognise HE-AAC(v2) generated by ffmpeg

[Jamie0]

System info

Operating System: Ubuntu 20.04
Shaka Packager Version: v2.6.1

Issue and steps to reproduce the problem

When using ffmpeg to encode HE-AAC (v1 or v2) as an input to shaka-packager, the input is treated as AAC LC.

Packager Command: /bin/packager in=/dev/stdin --dump_stream_info

Extra steps to reproduce the problem?
Use ffmpeg to generate an MPEG transport stream e.g. ffmpeg -i http://localhost:8000/radio_service -c:a libfdk_aac -b:a 48k -profile:a aac_he_v2 -tag:a AACH -f mpegts -loglevel debug pipe: | [...packager command]

What is the expected result?

shaka-packager should recognise the HE-AAC-v2 codec tag and reflect it in the codec string. I would expect the following output:

Found 1 stream(s).
Stream [0] type: Audio
 codec_string: mp4a.40.29
 time_scale: 90000
 duration: Infinite
 is_encrypted: false
 codec: AAC
 sample_bits: 16
 num_channels: 2
 sampling_frequency: 48000
 language: 

What happens instead?

shaka-packager treats the HE-AAC-v2 (SBR + PS) stream as AAC LC and as such .m3u8 cannot be played back correctly on Apple devices

Found 1 stream(s).
Stream [0] type: Audio
 codec_string: mp4a.40.2
 time_scale: 90000
 duration: Infinite
 is_encrypted: false
 codec: AAC
 sample_bits: 16
 num_channels: 1
 sampling_frequency: 24000
 language: 

Running ffprobe against the generated MPEG-TS correctly identifies HE-AAC:

Input #0, mpegts, from '/tmp/out.ts':
  Duration: 00:00:15.40, start: 64688.427900, bitrate: 61 kb/s
  Program 1 
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
  Stream #0:0[0x100]: Audio: aac (HE-AACv2) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 47 kb/s