No audio in downloaded egghead videos

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Verbose output

$ youtube-dl -v https://egghead.io/lessons/react-redux-the-single-immutable-state-tree                           
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://egghead.io/lessons/react-redux-the-single-immutable-state-tree']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.03.09
[debug] Python version 2.7.15rc1 (CPython) - Linux-4.15.0-46-generic-x86_64-with-elementary-5.0-juno
[debug] exe versions: ffmpeg 3.4.4, ffprobe 3.4.4, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[egghead:lesson] react-redux-the-single-immutable-state-tree: Downloading JSON metadata
[egghead:lesson] 696: Downloading m3u8 information
[egghead:lesson] 696: Downloading MPD manifest
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://d2c5owlt6rorc3.cloudfront.net/javascript-redux-the-single-immutable-state-tree-c6a3d339f0/javascript-redux-the-single-immutable-state-tree-c6a3d339f0.mpd'
[dashsegments] Total fragments: 34
[download] Destination: Redux - The Single Immutable State Tree-696.fdash-46709e1a-21d6-4135-8c69-267183bcf978.mp4
[download]  11.8% of ~1.83MiB at 203.20KiB/s ETA 00:17^C

Description of the bug

The video is downloaded with no audio, this problem can be verified by running mediainfo command on the downloaded video...

$ mediainfo Redux\ -\ The\ Single\ Immutable\ State\ Tree-696.fdash-46709e1a-21d6-4135-8c69-267183bcf978.mp4.part
General
Complete name                            : Redux - The Single Immutable State Tree-696.fdash-46709e1a-21d6-4135-8c69-267183bcf978.mp4.part
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp42/mp41)
File size                                : 220 KiB
Duration                                 : 12 s 0 ms
Overall bit rate                         : 150 kb/s
FileExtension_Invalid                    : mov mp4 m4v m4a m4b m4p 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4v

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 5 Ref Frames
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 5 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 12 s 0 ms
Bit rate                                 : 148 kb/s
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.006
Stream size                              : 217 KiB (98%)

Clearly there is no audio section, also the verbose flag shows that it should be asking for the best video and best audio, requesting only the audio works fine...

$ youtube-dl --extract-audio --audio-format mp3 https://egghead.io/lessons/react-redux-the-single-immutable-state-tree
$ mediainfo Redux\ -\ The\ Single\ Immutable\ State\ Tree.m4a.part
General
Complete name                            : Redux - The Single Immutable State Tree.m4a.part
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp42/mp41)
File size                                : 249 KiB
Duration                                 : 16 s 0 ms
Overall bit rate mode                    : Constant
Overall bit rate                         : 128 kb/s
FileExtension_Invalid                    : mov mp4 m4v m4a m4b m4p 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4v

Audio
ID                                       : 1
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : mp4a-40-2
Duration                                 : 16 s 0 ms
Bit rate mode                            : Constant
Bit rate                                 : 128 kb/s
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 245 KiB (98%)

Sorry for the wrong bug description, after downloading the video it started downloading the audio and merged them, the issue was in passing the -f "(mp4)[height<=720]" flag...

$ youtube-dl -v -o "%(playlist)s/%(playlist_index)s - %(title)s.%(ext)s" -f "(mp4)[height<=720]" https://egghead.io/courses/getting-started-with-redux
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'-o', u'%(playlist)s/%(playlist_index)s - %(title)s.%(ext)s', u'-f', u'(mp4)[height<=720]', u'https://egghead.io/courses/getting-started-with-redux']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.03.09
[debug] Python version 2.7.15rc1 (CPython) - Linux-4.15.0-46-generic-x86_64-with-elementary-5.0-juno
[debug] exe versions: ffmpeg 3.4.4, ffprobe 3.4.4, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[egghead:course] getting-started-with-redux: Downloading course lessons JSON
[egghead:course] getting-started-with-redux: Downloading course JSON
[download] Downloading playlist: Getting Started with Redux
[egghead:course] playlist Getting Started with Redux: Collected 30 video ids (downloading 30 of them)
[download] Downloading video 1 of 30
[egghead:lesson] react-redux-the-single-immutable-state-tree: Downloading JSON metadata
[egghead:lesson] 696: Downloading m3u8 information
[egghead:lesson] 696: Downloading MPD manifest
[debug] Invoking downloader on u'https://d2c5owlt6rorc3.cloudfront.net/javascript-redux-the-single-immutable-state-tree-c6a3d339f0/javascript-redux-the-single-immutable-state-tree-c6a3d339f0.mpd'
[dashsegments] Total fragments: 34
[download] Destination: Getting Started with Redux/01 - Redux - The Single Immutable State Tree.mp4
[download] 100% of 7.37MiB in 00:26
[download] Downloading video 2 of 30
[egghead:lesson] react-redux-describing-state-changes-with-actions: Downloading JSON metadata
[egghead:lesson] 697: Downloading m3u8 information
[egghead:lesson] 697: Downloading MPD manifest
[debug] Invoking downloader on u'https://d2c5owlt6rorc3.cloudfront.net/javascript-redux-describing-state-changes-with-actions-f6d05cbf0f/javascript-redux-describing-state-changes-with-actions-f6d05cbf0f.mpd'
[dashsegments] Total fragments: 45
[download] Destination: Getting Started with Redux/02 - Redux - Describing State Changes with Actions.mp4
[download] 100% of 7.19MiB in 00:29
[download] Downloading video 3 of 30
...

Running mediainfo now on any downloaded video shows no Audio

$ mediainfo Getting\ Started\ with\ Redux/01\ -\ Redux\ -\ The\ Single\ Immutable\ State\ Tree.mp4 
General
Complete name                            : Getting Started with Redux/01 - Redux - The Single Immutable State Tree.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp42/mp41)
File size                                : 7.37 MiB
Duration                                 : 2 min 11 s
Overall bit rate                         : 470 kb/s

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 5 Ref Frames
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 5 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 2 min 11 s
Bit rate                                 : 468 kb/s
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.020
Stream size                              : 7.33 MiB (100%)

But if downloaded with no -f flag it downloads with audio successfully.

ytdl-org / youtube-dl