--title switch with variable arguments prevents Twitch rerun vod from playing #3206
Description
Bug Report
- This is a bug report and I have read the contribution guidelines.
Description
If you use the --title switch with arguments that contain variables like {author}, {category}, or {title}, streamlink cannot play certain twitch streams (reruns, I think)Expected / Actual behavior
I expect streamlink to open the twitch stream in my player of choice and start playing. Instead, I get errors, nothing plays, and streamlink quits.
Reproduction steps / Explicit stream URLs to test
- Find a twitch channel that is playing reruns, for example: reckful
- Launch using a command like: streamlink --loglevel debug --verbose-player --player=mpv --title "{author}" twitch.tv/reckful best
- See log output
Log output
[azizLIGHT@fractal ~]$ /home/azizLIGHT/Documents/Scripts/streamlink-pip/bin/streamlink --loglevel debug --verbose-player --player=mpv --title "{author}" twitch.tv/reckful best
[cli][debug] OS: Linux-5.4.52-1-MANJARO-x86_64-with-glibc2.2.5
[cli][debug] Python: 3.8.3
[cli][debug] Streamlink: 1.5.0+31.g1913115
[cli][debug] Requests(2.24.0), Socks(1.7.1), Websocket(0.57.0)
[cli][info] Found matching plugin twitch for URL twitch.tv/reckful
[plugin.twitch][debug] Getting live HLS streams for reckful
[utils.l10n][debug] Language code: en_US
[cli][info] Available streams: audio_only, 160p (worst), 360p, 480p, 720p, 720p60_alt, 720p60 (best)
[cli][info] Opening stream: 720p60 (hls)
[stream.hls][debug] Reloading playlist
[stream.hls][debug] First Sequence: 3689; Last Sequence: 3702
[stream.hls][debug] Start offset: 0; Duration: None; Start Sequence: 3700; End Sequence: None
[stream.hls][debug] Adding segment 3700 to queue
[cli][debug] Pre-buffering 8192 bytes
[stream.hls][debug] Adding segment 3701 to queue
[stream.hls][debug] Adding segment 3702 to queue
[stream.hls][debug] Download of segment 3700 complete
[stream.hls][debug] Download of segment 3701 complete
[stream.hls][debug] Download of segment 3702 complete
[cli][info] Closing currently open stream...
[stream.segmented][debug] Closing worker thread
[stream.segmented][debug] Closing writer thread
Traceback (most recent call last):
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/bin/streamlink", line 11, in <module>
load_entry_point('streamlink==1.5.0+31.g1913115', 'console_scripts', 'streamlink')()
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink_cli/main.py", line 1027, in main
handle_url()
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink_cli/main.py", line 602, in handle_url
handle_stream(plugin, streams, stream_name)
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink_cli/main.py", line 455, in handle_stream
success = output_stream(plugin, stream)
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink_cli/main.py", line 316, in output_stream
output = create_output(plugin)
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink_cli/main.py", line 114, in create_output
title = create_title(plugin)
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink_cli/main.py", line 148, in create_title
title = LazyFormatter.format(
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink/utils/lazy_formatter.py", line 22, in format
return string.Formatter().vformat(fmt, (), cls(**lazy_props))
File "/usr/lib/python3.8/string.py", line 167, in vformat
result, _ = self._vformat(format_string, args, kwargs, used_args, 2)
File "/usr/lib/python3.8/string.py", line 207, in _vformat
obj, arg_used = self.get_field(field_name, args, kwargs)
File "/usr/lib/python3.8/string.py", line 272, in get_field
obj = self.get_value(first, args, kwargs)
File "/usr/lib/python3.8/string.py", line 229, in get_value
return kwargs[key]
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink/utils/lazy_formatter.py", line 11, in __getitem__
return value()
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink_cli/main.py", line 151, in <lambda>
author=lambda: plugin.get_author() or DEFAULT_STREAM_METADATA["author"],
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink/plugins/twitch.py", line 422, in get_author
self._get_metadata()
File "/home/azizLIGHT/Documents/Scripts/streamlink-pip/lib/python3.8/site-packages/streamlink/plugins/twitch.py", line 410, in _get_metadata
api_res = self.api.streams(self.channel_id)["stream"]["channel"]
TypeError: 'NoneType' object is not subscriptable
[azizLIGHT@fractal ~]$
Additional comments, screenshots, etc.
Normally I use --title "{author} - {category} - {title} - (${{video-bitrate}})" in my command, but any of those will cause streamlink to fail when trying to watch reckful stream. It does not seem to do it for regular live twitch channels, maybe it only does it to rerun channels. I am not sure. This was streamlink installed to a venv using these instructions
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