mkchromecast from source quits immediately on macOS with ffmpeg backend

[AuroraWright]

Using mkchromecast from source quits immediately (with exit value 0, no errors) on macOS 10.13.6 if used with the ffmpeg backend like so: bin/mkchromecast --encoder-backend ffmpeg

• latest python3 (3.7.2) from brew
• python dependencies were installed with pip3 with the requirements.txt
• Soundflower is properly installed and working (as tested with other apps)
• ffmpeg is installed with brew with all options enabled, here's the command line:

  
  ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1-with-options --enable-shared --enable-hardcoded-tables --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/jdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/jdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-gpl --enable-libaom --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --disable-libjack --disable-indev=jack --enable-opencl --enable-videotoolbox --disable-htmlpages --enable-chromaprint --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfdk-aac --enable-libgme --enable-libgsm --enable-libmodplug --enable-libopenh264 --enable-librsvg --enable-librtmp --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtesseract --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzimg --enable-libzmq --enable-openssl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.3.0/include/openjpeg-2.3 --enable-nonfree
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
  Hyper fast Audio and Video encoder
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'

Here's the output of a --debug invocation:

bin/mkchromecast --encoder-backend ffmpeg --debug ALSA device name: None. Google Cast name: None. backends: ['node', 'ffmpeg'] ALSA device name: None. Google Cast name: None. backends: ['node', 'ffmpeg'] USER =aurora PATH =./bin:./nodejs/bin:/Users/aurora/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/usr/X11/bin:/usr/games:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/VMware Fusion.app/Contents/Public:/usr/local/MacGPG2/bin:/usr/local/sbin:/Users/aurora/.gem/bin:/usr/local/opt/qt/bin:/opt/devkitpro/devkitPPC/bin:/opt/devkitpro/devkitARM/bin:/opt/devkitpro/devkitA64/bin:/Applications/010 Editor.app/Contents/CmdLine Mkchromecast v0.3.9 :::audio::: chunk_size, frame_size, buffer_size: 64, 2048, 8192 Selected backend: ffmpeg Selected audio codec: mp3 Default bitrate used: 192k Default sample rate used: 44100Hz. :::audio::: command ['ffmpeg', '-f', 'avfoundation', '-i', ':Soundflower (2ch)', '-f', 'mp3', '-acodec', 'libmp3lame', '-ac', '2', '-ar', '44100', '-b:a', '192k', 'pipe:'] PID of main process: 26116 PID of streaming process: 26119

• Running on http://192.168.0.2:5000/ (Press CTRL+C to quit) self.cclist [[0, 'Aury', 'Gcast']] if len(self.cclist) != 0 and self.select_device == False:

List of Devices Available in Network:

Index Types Friendly Name ===== ===== ============= 0 Gcast Aury

Casting to first device shown above! Select devices by using the -s flag.

Aury

def get_devices(self):

Information about Aury

DeviceStatus(friendly_name='Aury', model_name='Chromecast', manufacturer='Google Inc.', uuid=UUID('915899a5-e6f1-e9f7-7d3b-8e885490a7bb'), cast_type='cast')

Status of device Aury

CastStatus(is_active_input=False, is_stand_by=True, volume_level=1.0, volume_muted=False, app_id='CC1AD845', display_name='Default Media Receiver', namespaces=['urn:x-cast:com.google.cast.cac', 'urn:x-cast:com.google.cast.broadcast', 'urn:x-cast:com.google.cast.media'], session_id='ca6a91a1-4106-4492-acf0-2ad4d28d0a0d', transport_id='ca6a91a1-4106-4492-acf0-2ad4d28d0a0d', status_text='Default Media Receiver')

Switching to SoundFlower... [Done] def play_cast(self): The IP of Aury is: 192.168.0.35 Your local IP is: 192.168.0.2

The media type string used is: audio/mpeg

Cast media controller status

CastStatus(is_active_input=False, is_stand_by=True, volume_level=1.0, volume_muted=False, app_id='CC1AD845', display_name='Default Media Receiver', namespaces=['urn:x-cast:com.google.cast.cac', 'urn:x-cast:com.google.cast.broadcast', 'urn:x-cast:com.google.cast.media'], session_id='ca6a91a1-4106-4492-acf0-2ad4d28d0a0d', transport_id='ca6a91a1-4106-4492-acf0-2ad4d28d0a0d', status_text='Default Media Receiver')

Ctrl-C to kill the Application at any Time

[AuroraWright]

OK I fixed this I think (although I'm not sure if my solution is proper). I replaced https://github.com/muammar/mkchromecast/blob/master/bin/mkchromecast#L273-L277 with:

            signal.sigwait([signal.SIGINT, signal.SIGTERM])
            self.terminate_app()

For some reason it seems it receives 3 extraneous signals which unpause the process and make it terminate, so waiting for only those two signals fixes it.

[muammar]

You are right. That is a bug. Would you be willing to create a pull request for this? Thanks.