Cast won't work on TV

[GoldenGSo99]

Cast won't work on PANASONIC TV but work on other pcs running kodi

ChatGPT says this
_The streaming works and the server is running, but your Panasonic TV rejected the stream with this error:

upnpclient.soap.SOAPError: (714, 'Illegal mime type')
🔍 What that means:
Your TV didn't like the MIME type of the media being sent. Most DLNA devices have strict support for only certain video codecs and container formats. In this case, it's likely the TV doesn’t accept an HLS stream (index.m3u8) with MIME type application/vnd.apple.mpegurl_

is there anything i can do to fix it?

C:\Programs\dlna>dlna-cast screen
HTTP: start to serving at port 51014
run command:  ffmpeg.exe -framerate 30 -f dshow -i video="screen-capture-recorder":audio="virtual-audio-capturer" -c:v libx264 -preset fast -tune zerolatency -crf 21 -vf format=yuv420p -keyint_min:v 1 -force_key_frames:v "expr:gte(t,n_forced*2)" -f hls -hls_time 2 -hls_list_size 10 -hls_flags delete_segments 'C:\Users\Vasilis\dlna-cast\index.m3u8'
ffmpeg version N-119323-g9e1162bdf1-20250421 Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (crosstool-NG 1.27.0.18_7458341)
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-shared --disable-static --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-libxml2 --enable-lzma --enable-fontconfig --enable-libharfbuzz --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth --enable-chromaprint --enable-libdav1d --enable-libdavs2 --enable-libdvdread --enable-libdvdnav --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libaribcaption --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-libzmq --enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --enable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libvvenc --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-libs=-lgomp --extra-ldflags=-pthread --extra-ldexeflags= --cc=x86_64-w64-mingw32-gcc --cxx=x86_64-w64-mingw32-g++ --ar=x86_64-w64-mingw32-gcc-ar --ranlib=x86_64-w64-mingw32-gcc-ranlib --nm=x86_64-w64-mingw32-gcc-nm --extra-version=20250421
  libavutil      60.  2.100 / 60.  2.100
  libavcodec     62.  0.101 / 62.  0.101
  libavformat    62.  0.100 / 62.  0.100
  libavdevice    62.  0.100 / 62.  0.100
  libavfilter    11.  0.100 / 11.  0.100
  libswscale      9.  0.100 /  9.  0.100
  libswresample   6.  0.100 /  6.  0.100
  libpostproc    59.  1.100 / 59.  1.100
[aist#0:1/pcm_s16le @ 000002531d378480] Guessed Channel Layout: stereo
Input #0, dshow, from 'video=screen-capture-recorder:audio=virtual-audio-capturer':
  Duration: N/A, start: 14858.822000, bitrate: 1536 kb/s
  Stream #0:0: Video: rawvideo, bgr0, 1280x720, 30 fps, 30 tbr, 10000k tbn, Start-Time 14858.871s
  Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s, Start-Time 14858.822s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 000002531d3aac80] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 000002531d3aac80] profile High, level 3.1, 4:2:0, 8-bit
[libx264 @ 000002531d3aac80] 264 - core 165 - H.264/MPEG-4 AVC codec - Copyleft 2003-2025 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=2 lookahead_threads=2 sliced_threads=1 slices=2 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=250 keyint_min=1 scenecut=40 intra_refresh=0 rc=crf mbtree=0 crf=21.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, hls, to 'C:\Users\Vasilis\dlna-cast\index.m3u8':
  Metadata:
    encoder         : Lavf62.0.100
  Stream #0:0: Video: h264, yuv420p(tv, progressive), 1280x720, q=2-31, 30 fps, 90k tbn
    Metadata:
      encoder         : Lavc62.0.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc62.0.101 aac
[hls @ 000002531d384a40] Opening 'C:\Users\Vasilis\dlna-cast\index0.ts' for writingd=0.636x
[hls @ 000002531d384a40] Opening 'C:\Users\Vasilis\dlna-cast\index.m3u8.tmp' for writing
start to play http://192.168.1.13:51014/index.m3u8 on PANASONIC TV
192.168.1.2 - - [21/Apr/2025 23:59:08] "HEAD /index.m3u8 HTTP/1.1" 200 -drop=0 speed=0.675x
Traceback (most recent call last):
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\upnpclient\soap.py", line 110, in call
    resp.raise_for_status()
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\requests\models.py", line 1024, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: http://192.168.1.2:2870/AVTransport/control

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Scripts\dlna-cast.exe\__main__.py", line 7, in <module>
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\dlna_cast\main.py", line 180, in main
    Fire(WinCast)
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\fire\core.py", line 141, in Fire
    component_trace = _Fire(component, args, parsed_flag_args, context, name)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\fire\core.py", line 466, in _Fire
    component, remaining_args = _CallAndUpdateTrace(
                                ^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\fire\core.py", line 681, in _CallAndUpdateTrace
    component = fn(*varargs, **kwargs)
                ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\dlna_cast\main.py", line 121, in screen
    device.AVTransport.SetAVTransportURI(
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\upnpclient\upnp.py", line 473, in __call__
    soap_response = soap_client.call(
                    ^^^^^^^^^^^^^^^^^
  File "C:\Users\Vasilis\AppData\Local\Programs\Python\Python311\Lib\site-packages\upnpclient\soap.py", line 118, in call
    raise SOAPError(*self._extract_upnperror(err_xml))
upnpclient.soap.SOAPError: (714, 'Illegal mime type')
frame=   90 fps= 22 q=15.0 size=N/A time=00:00:02.99 bitrate=N/A dup=45 drop=0 speed=0.745x
C:\Programs\dlna>

[link89]

is there anything i can do to fix it?

One possible issue is I don't specify meme-type in the HTTP response headers. Maybe your device respect the DLAN spec strictly that it checks the response header and find that the content-type header is empty or illegal.

In this case, you may have to patch the HTTP handler to add content-type properly. https://github.com/link89/dlna-cast/blob/main/dlna_cast/main.py#L60-L68

[GoldenGSo99]

I have no idea how to do it.
ChatGPT suggestions was these, is there any chnace they will work? If yes how do what it says?

_Option 1: Use a compatible format

Instead of HLS (.m3u8), try MPEG-TS or MP4, depending on what your TV supports.

To modify the ffmpeg command to output MPEG-TS (often safer for DLNA):

ffmpeg -framerate 30 -f dshow -i video="screen-capture-recorder":audio="virtual-audio-capturer"
-c:v libx264 -preset fast -tune zerolatency -crf 21 -vf format=yuv420p
-f mpegts C:\Users\Vasilis\dlna-cast\stream.ts

Then serve stream.ts over HTTP and update dlna-cast to point to it.

---

Option 2: Transcode to MP4 and serve

Another approach if you want better compatibility:

ffmpeg -framerate 30 -f dshow -i video="screen-capture-recorder":audio="virtual-audio-capturer"
-c:v libx264 -preset fast -crf 21 -vf format=yuv420p -f mp4
C:\Users\Vasilis\dlna-cast\stream.mp4

Then serve stream.mp4 and cast that instead._

[GoldenGSo99]

with help of deepseek i got to this a point, it connects, there is continuous connection, but black screen. Deepseek game me the code and told me to try changing video/mpegurl in the metadata to one of these:
video/mpeg
video/x-mpegurl
application/x-mpegur
It worked with video/mpeg, but black stream as i said.
Any idea what else i can try to fix the black stream?

cmd output:

dlna-cast screen "PANASONIC TV"
HTTP: start to serving at port 47762
run command:  ffmpeg.exe -framerate 30 -f dshow -i video="screen-capture-recorder":audio="virtual-audio-capturer" -c:v libx264 -preset ultrafast -tune zerolatency -crf 21 -vf format=yuv420p -c:a aac -ar 44100 -b:a 128k -flags +global_header -f hls -hls_time 2 -hls_list_size 10 -hls_flags delete_segments+append_list+omit_endlist 'C:\Users\vasil\dlna-cast\index.m3u8'
ffmpeg version 2025-02-06-git-6da82b4485-essentials_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      59. 56.100 / 59. 56.100
  libavcodec     61. 32.101 / 61. 32.101
  libavformat    61.  9.106 / 61.  9.106
  libavdevice    61.  4.100 / 61.  4.100
  libavfilter    10.  9.100 / 10.  9.100
  libswscale      8. 13.100 /  8. 13.100
  libswresample   5.  4.100 /  5.  4.100
  libpostproc    58.  4.100 / 58.  4.100
[aist#0:1/pcm_s16le @ 000001bf8c02aa40] Guessed Channel Layout: stereo
Input #0, dshow, from 'video=screen-capture-recorder:audio=virtual-audio-capturer':
  Duration: N/A, start: 9312.979000, bitrate: 6144 kb/s
  Stream #0:0: Video: rawvideo, bgr0, 1280x1024, 30 fps, 30 tbr, 10000k tbn
  Stream #0:1: Audio: pcm_s16le, 192000 Hz, stereo, s16, 6144 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 000001bf8c0246c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001bf8c0246c0] profile Constrained Baseline, level 3.2, 4:2:0, 8-bit
[libx264 @ 000001bf8c0246c0] 264 - core 164 r3204 373697b - H.264/MPEG-4 AVC codec - Copyleft 2003-2025 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 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=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=21.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, hls, to 'C:\Users\vasil\dlna-cast\index.m3u8':
  Metadata:
    encoder         : Lavf61.9.106
  Stream #0:0: Video: h264, yuv420p(tv, progressive), 1280x1024, q=2-31, 30 fps, 90k tbn
    Metadata:
      encoder         : Lavc61.32.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc61.32.101 aac
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index0.ts' for writinged=0.994x
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index.m3u8.tmp' for writing
start to play http://192.168.1.10:47762/index.m3u8 on PANASONIC TV
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index1.ts' for writinged=0.998x
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index.m3u8.tmp' for writing
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index2.ts' for writinged=0.999x
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index.m3u8.tmp' for writing
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index3.ts' for writinged=0.999x
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index.m3u8.tmp' for writing
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index4.ts' for writinged=0.999x
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index.m3u8.tmp' for writing
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index5.ts' for writinged=0.999x
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index.m3u8.tmp' for writing
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index6.ts' for writinged=0.999x
[hls @ 000001bf8c020780] Opening 'C:\Users\vasil\dlna-cast\index.m3u8.tmp' for writing
frame= 1951 fps= 30 q=11.0 size=N/A time=00:01:04.92 bitrate=N/A dup=1 drop=0 speed=0.999x

main.py

import sys
import os
from os.path import join, expanduser, exists
import subprocess as sp
import shlex
import shutil
import http.server
import threading
from time import sleep
import mimetypes

from fire import Fire
from dotenv import load_dotenv

import atexit

from .ssdp import discover

load_dotenv(join(os.getcwd(), '.env'))
USER_HOME = expanduser("~")


def get_env_or_opt(opt, env_name):
    return opt or os.getenv(env_name)


class BaseCast:

    @property
    def ffmpeg_name(self):
        raise NotImplemented()

    @property
    def default_ffmpeg_input_opts(self):
        raise NotImplemented()

    @property
    def ffmpeg_home(self):
        return os.getenv('FFMPEG_HOME')

    @property
    def ffmpeg_bin(self):
        default_bin = self.ffmpeg_name if self.ffmpeg_home is None else join(
            self.ffmpeg_home, self.ffmpeg_name)
        return os.getenv('FFMPEG_BIN', default_bin)

    @property
    def dlna_cast_dir(self):
        return os.getenv('DLNA_CAST_DIR', join(USER_HOME, 'dlna-cast'))

    def _get_devices(self):
        devices = discover(timeout=3)
        return [d for d in devices if d.find_action('SetAVTransportURI')]

    def _find_device(self, name):
        for d in self._get_devices():
            if d.friendly_name == name:
                return d

    def _start_http_server(self):
        class Handler(http.server.SimpleHTTPRequestHandler):
            def __init__(_, *args, **kwargs):
                super().__init__(*args, directory=self.dlna_cast_dir, **kwargs)
            
            def guess_type(_, path):
                if path.endswith('.m3u8'):
                    return 'video/mpegurl'  # Panasonic-compatible MIME type
                elif path.endswith('.ts'):
                    return 'video/MP2T'
                return super().guess_type(path)
            
            def end_headers(_):
                _.send_header('Cache-Control', 'no-cache')
                _.send_header('Access-Control-Allow-Origin', '*')
                _.send_header('transferMode.dlna.org', 'Streaming')
                _.send_header('contentFeatures.dlna.org', 'DLNA.ORG_OP=01;DLNA.ORG_CI=0;DLNA.ORG_FLAGS=01500000000000000000000000000000')
                super().end_headers()

        with http.server.ThreadingHTTPServer(("", 0), Handler) as httpd:
            self._httpd = httpd
            self._listen_port = httpd.server_address[1]
            print("HTTP: start to serving at port", self._listen_port)
            httpd.serve_forever()

    def _start_ffmpeg_streaming(self, framerate=30, input_opts='', segment_size=1, crf=21):
        input_opts = input_opts or self.default_ffmpeg_input_opts
        enc_opts = (
            '-c:v libx264 -preset ultrafast -tune zerolatency -crf {crf} '
            '-vf "scale=1280:720,format=yuv420p" '  # Force 720p resolution
            '-c:a aac -ar 44100 -b:a 128k '
            '-profile:v baseline -level 3.0 '  # Most compatible H.264 settings
            '-f hls -hls_time {segment_size} -hls_list_size 10 '
            '-hls_flags delete_segments+append_list+omit_endlist'
        ).format(segment_size=segment_size, crf=crf)

        cmd = [
            self.ffmpeg_bin, '-framerate', str(framerate),
            input_opts, enc_opts,
            shlex.quote(join(self.dlna_cast_dir, 'index.m3u8')),
        ]
        cmd = ' '.join(cmd)
        print('run command: ', cmd)
        self._ffmpeg_process = sp.Popen(shlex.split(cmd))
        atexit.register(lambda: self._ffmpeg_process.kill())

    def __init__(self):
        self._listen_port = None
        self._httpd = None
        self._ffmpeg_process = None

    def screen(self, dlna_device=None, framerate=30, input_opts=None, segment_size=2, crf=21):
        # clean up
        shutil.rmtree(self.dlna_cast_dir, ignore_errors=True)
        os.makedirs(self.dlna_cast_dir, exist_ok=True)

        # discover dlan_device
        dlna_device = get_env_or_opt(dlna_device, 'DLNA_DEVICE')
        assert dlna_device, 'dlna_device must be set!'
        device = self._find_device(dlna_device)
        assert device, 'cannot find deivce named {}'.format(dlna_device)

        # start http server for hls
        thread = threading.Thread(target=self._start_http_server, daemon=True)
        thread.start()

        while self._listen_port is None:
            sleep(0.1)

        # start ffmpeg streaming
        input_opts = get_env_or_opt(input_opts, 'FFMPEG_INPUT_OPTS')
        self._start_ffmpeg_streaming(framerate, input_opts, segment_size, crf)
        while not exists(join(self.dlna_cast_dir, 'index.m3u8')):
            sleep(0.1)

        # play video with proper DLNA metadata
        hls_url = 'http://{}:{}/index.m3u8'.format(
            device.iface_ip, self._listen_port)
        print('start to play {} on {}'.format(hls_url, device.friendly_name))
        
        # Create proper DLNA metadata for HLS stream
        metadata = '''<?xml version="1.0" encoding="utf-8"?>
<DIDL-Lite xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/"
           xmlns:dc="http://purl.org/dc/elements/1.1/"
           xmlns:upnp="urn://schemas-upnp-org/metadata-1-0/upnp/">
  <item id="1" parentID="0" restricted="1">
    <dc:title>Screen Cast</dc:title>
    <upnp:class>object.item.videoItem</upnp:class>
    <res protocolInfo="http-get:*:video/mpeg:DLNA.ORG_OP=01;DLNA.ORG_CI=0;DLNA.ORG_FLAGS=01500000000000000000000000000000">{}</res>
  </item>
</DIDL-Lite>'''.format(hls_url)
        
        device.AVTransport.SetAVTransportURI(
            InstanceID=0,
            CurrentURI=hls_url,
            CurrentURIMetaData=metadata
        )

        def stop_play_on_exit():
            device.AVTransport.Stop(
                InstanceID=0,
            )
            print('stop remote video')

        atexit.register(stop_play_on_exit)

        # wait for subprocess
        self._ffmpeg_process.wait()

    def list_dshow_devices(self):
        cmd = [self.ffmpeg_bin, '-hide_banner',
               '-list_devices', 'true', '-f', 'dshow', '-i', 'dummy']
        sp.call(cmd)

    def list_dlna_devices(self):
        devices = self._get_devices()
        for d in devices:
            print(d.friendly_name)

class WinCast(BaseCast):
    @property
    def ffmpeg_name(self):
        return 'ffmpeg.exe'

    @property
    def default_ffmpeg_input_opts(self):
        return '-f dshow -i video="screen-capture-recorder":audio="virtual-audio-capturer"'

class MacCast(BaseCast):
    @property
    def ffmpeg_name(self):
        return 'ffmpeg'

    @property
    def default_ffmpeg_input_opts(self):
        pass  # TODO

class LinuxCast(BaseCast):
    @property
    def ffmpeg_name(self):
        return 'ffmpeg'

    @property
    def default_ffmpeg_input_opts(self):
        display = os.environ.get('DISPLAY')
        return '-f x11grab -i %s' % display

def main():
    if sys.platform == 'darwin':
        Fire(MacCast)
    elif sys.platform == 'win32':
        Fire(WinCast)
    else:
        Fire(LinuxCast)

if __name__ == '__main__':
    main()