dash plugin: MPDParsingError: root tag did not match the expected tag: MPD

Checklist

• This is a plugin issue and not a different kind of issue
• I have read the contribution guidelines
• I have checked the list of open and recently closed plugin issues
• I have checked the commit log of the master branch

Streamlink version

Latest build from the master branch

Description

The following steps worked until yesterday:

1. Connect to a channel livestream of Teleboy (teleboy.ch) or Zattoo (zattoo.com) with my web browser.
2. Get the .mpd URL link of the livestream.
3. Launch the command "streamlink “mpd-url-link best”.
4. The livestream opens up in VLC.

Since today, the command fails.

Here is an example of the .mpd file content which streamlink fails to play: https://pastebin.com/jXD1NY1F

Debug log

streamlink "https://zh2-0-dash-live.zahs.tv/HD_orf1/m.mpd?z32=MF2WI2LPL5RW6ZDFMNZT2YLBMMTGG43JMQ6TCNSBII4DSMJSIZBTEMJVIQ2EKLJUGEZDORJSGVCDKOBTIE4ECOKEEZWWC6DSMF2GKPJVGAYDAJTNNFXHEYLUMU6TEMJQEZYHEZLGMVZHEZLEL5WGC3THOVQWOZJ5MZZCM43JM46TSX3FG4YDGMJXG5RGIMRVGNSTCMLBGI4GEMZRG5SDQN3DGRSGGYJXGETHK43FOJPWSZB5ORSWYZLCN54TUORYGM4DSMRXEZ3D2MA" best --loglevel debug
[cli][debug] OS:         Windows 10
[cli][debug] Python:     3.9.6
[cli][debug] Streamlink: 2.4.0
[cli][debug] Requests(2.26.0), Socks(1.7.1), Websocket(1.2.1)
[cli][debug] Arguments:
[cli][debug]  url=https://zh2-0-dash-live.zahs.tv/HD_orf1/m.mpd?z32=MF2WI2LPL5RW6ZDFMNZT2YLBMMTGG43JMQ6TCNSBII4DSMJSIZBTEMJVIQ2EKLJUGEZDORJSGVCDKOBTIE4ECOKEEZWWC6DSMF2GKPJVGAYDAJTNNFXHEYLUMU6TEMJQEZYHEZLGMVZHEZLEL5WGC3THOVQWOZJ5MZZCM43JM46TSX3FG4YDGMJXG5RGIMRVGNSTCMLBGI4GEMZRG5SDQN3DGRSGGYJXGETHK43FOJPWSZB5ORSWYZLCN54TUORYGM4DSMRXEZ3D2MA
[cli][debug]  stream=['best']
[cli][debug]  --loglevel=debug
[cli][debug]  --rtmp-rtmpdump=rtmpdump.exe
[cli][debug]  --rtmpdump=C:\Program Files (x86)\Streamlink\rtmpdump\rtmpdump.exe
[cli][debug]  --ffmpeg-ffmpeg=C:\Program Files (x86)\Streamlink\ffmpeg\ffmpeg.exe
[cli][info] Found matching plugin dash for URL https://zh2-0-dash-live.zahs.tv/HD_orf1/m.mpd?z32=MF2WI2LPL5RW6ZDFMNZT2YLBMMTGG43JMQ6TCNSBII4DSMJSIZBTEMJVIQ2EKLJUGEZDORJSGVCDKOBTIE4ECOKEEZWWC6DSMF2GKPJVGAYDAJTNNFXHEYLUMU6TEMJQEZYHEZLGMVZHEZLEL5WGC3THOVQWOZJ5MZZCM43JM46TSX3FG4YDGMJXG5RGIMRVGNSTCMLBGI4GEMZRG5SDQN3DGRSGGYJXGETHK43FOJPWSZB5ORSWYZLCN54TUORYGM4DSMRXEZ3D2MA
[plugins.dash][debug] Parsing MPD URL: https://zh2-0-dash-live.zahs.tv/HD_orf1/m.mpd?z32=MF2WI2LPL5RW6ZDFMNZT2YLBMMTGG43JMQ6TCNSBII4DSMJSIZBTEMJVIQ2EKLJUGEZDORJSGVCDKOBTIE4ECOKEEZWWC6DSMF2GKPJVGAYDAJTNNFXHEYLUMU6TEMJQEZYHEZLGMVZHEZLEL5WGC3THOVQWOZJ5MZZCM43JM46TSX3FG4YDGMJXG5RGIMRVGNSTCMLBGI4GEMZRG5SDQN3DGRSGGYJXGETHK43FOJPWSZB5ORSWYZLCN54TUORYGM4DSMRXEZ3D2MA
Traceback (most recent call last):
  File "runpy.py", line 197, in _run_module_as_main
  File "runpy.py", line 87, in _run_code
  File "C:\Program Files (x86)\Streamlink\bin\streamlink.exe\__main__.py", line 18, in <module>
  File "C:\Program Files (x86)\Streamlink\pkgs\streamlink_cli\main.py", line 1082, in main
    handle_url()
  File "C:\Program Files (x86)\Streamlink\pkgs\streamlink_cli\main.py", line 576, in handle_url
    streams = fetch_streams(plugin)
  File "C:\Program Files (x86)\Streamlink\pkgs\streamlink_cli\main.py", line 470, in fetch_streams
    return plugin.streams(stream_types=args.stream_types,
  File "C:\Program Files (x86)\Streamlink\pkgs\streamlink\plugin\plugin.py", line 335, in streams
    ostreams = self._get_streams()
  File "C:\Program Files (x86)\Streamlink\pkgs\streamlink\plugins\dash.py", line 34, in _get_streams
    return DASHStream.parse_manifest(self.session, url)
  File "C:\Program Files (x86)\Streamlink\pkgs\streamlink\stream\dash.py", line 185, in parse_manifest
    mpd = MPD(session.http.xml(res, ignore_ns=True), base_url=urlunparse(urlp), url=url)
  File "C:\Program Files (x86)\Streamlink\pkgs\streamlink\stream\dash_manifest.py", line 224, in __init__
    super().__init__(node, root=self, *args, **kwargs)
  File "C:\Program Files (x86)\Streamlink\pkgs\streamlink\stream\dash_manifest.py", line 146, in __init__
    raise MPDParsingError("root tag did not match the expected tag: {}".format(self.__tag__))
streamlink.stream.dash_manifest.MPDParsingError: root tag did not match the expected tag: MPD

[bastimeyer]

Looks like the issue is the regex for stripping off the default namespace attribute. It’s expecting a leading space or tab character, which is not the case in your input manifest, where it’s using a new-line character instead. The regex did not get changed though in the recent code refactorings, which means the issue was already present in earlier versions of Streamlink. https://github.com/streamlink/streamlink/blob/e38caa19a12363c60be1d73629543b810b6b9c99/src/streamlink/utils/parse.py#L79

That should fix it:

diff --git a/src/streamlink/utils/parse.py b/src/streamlink/utils/parse.py
index 8165a2c3..2a4de948 100644
--- a/src/streamlink/utils/parse.py
+++ b/src/streamlink/utils/parse.py
@@ -76,7 +76,7 @@ def parse_xml(
     if isinstance(data, str):
         data = bytes(data, "utf8")
     if ignore_ns:
-        data = re.sub(br"[\t ]xmlns=\"(.+?)\"", b"", data)
+        data = re.sub(br"\s+xmlns=\"(.+?)\"", b"", data)
     if invalid_char_entities:
         data = re.sub(br"&(?!(?:#(?:[0-9]+|[Xx][0-9A-Fa-f]+)|[A-Za-z0-9]+);)", b"&", data)

Can you confirm this? It’s parsing the manifest correctly for me.

$ streamlink -l debug 'dash://file://./foo'
[cli][debug] OS:         Linux-5.14.8-1-git-x86_64-with-glibc2.33
[cli][debug] Python:     3.9.7
[cli][debug] Streamlink: 2.4.0+37.ge38caa1.dirty
[cli][debug] Requests(2.26.0), Socks(1.7.1), Websocket(0.58.0)
[cli][debug] Arguments:
[cli][debug]  url=dash://file://./foo
[cli][debug]  --loglevel=debug
[cli][debug]  --player=mpv
[cli][info] Found matching plugin dash for URL dash://file://./foo
[plugins.dash][debug] Parsing MPD URL: file://./foo
[utils.l10n][debug] Language code: en_US
[stream.dash][debug] Available languages for DASH audio streams: mis, de (using: de)
Available streams: 224p (worst), 288p_alt, 288p, 432p, 720p_alt, 720p (best)

[Europe57]

Thanks, I updated Python, it works. Sorry for the late reply, but I’m not fast in Linux