Bug Report

• This is a bug report and I have read the contribution guidelines.

Description

Streamlink will either crash after a 15 second commercial break or will operate slowly after the 15 second commercial break at startup.

Expected / Actual behavior

After typing in my streamlink command:
streamlink twitch.tv/xqcow best --hls-live-edge 1 --twitch-low-latency

I should jump right into the live edge of the stream. Instead, I will end up watching a commercial placeholder, and then most of the time crash my VLC media player afterwards. I am currently building an application as well that pipes my streamlink output into FFMPEG, and this pipe will break as well.

Reproduction steps / Explicit stream URLs to test

1. ... Type in the command streamlink twitch.tv/channel_name best --hls-live-edge 1 --twitch-low-latency
2. ... Wait out the new 15 second commercial timeout
3. ... By this point it should have crashed. If it did not then exit VLC media player and try again

Log output

streamlink twitch.tv/xqcow best --hls-live-edge 1 --twitch-low-latency --loglevel debug
[cli][debug] OS: Windows 10
[cli][debug] Python: 3.6.6
[cli][debug] Streamlink: 1.5.0
[cli][debug] Requests(2.24.0), Socks(1.7.1), Websocket(0.57.0)
[cli][info] Found matching plugin twitch for URL twitch.tv/xqcow
[cli][debug] Plugin specific arguments:
[cli][debug] --twitch-low-latency=True (low_latency)
[plugin.twitch][debug] Getting live HLS streams for xqcow
[utils.l10n][debug] Language code: en_US
[cli][info] Available streams: audio_only, 160p (worst), 360p, 480p, 720p, 720p60, 1080p60 (best)
[cli][info] Opening stream: 1080p60 (hls)
[plugin.twitch][info] Low latency streaming (HLS live edge: 1)
[stream.hls][debug] Reloading playlist
[plugin.twitch][info] This is not a low latency stream
[stream.hls][debug] First Sequence: 0; Last Sequence: 2
[stream.hls][debug] Start offset: 0; Duration: None; Start Sequence: 2; End Sequence: None
[stream.hls][debug] Adding segment 2 to queue
[cli][debug] Pre-buffering 8192 bytes
[cli][info] Starting player: "C:\Program Files\VideoLAN\VLC\vlc.exe"
[cli.output][debug] Opening subprocess: "C:\Program Files\VideoLAN\VLC\vlc.exe" --input-title-format twitch.tv/xqcow -
[stream.hls][debug] Download of segment 2 complete
[cli][debug] Writing stream to output
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 3 to queue
[stream.hls][debug] Download of segment 3 complete
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 4 to queue
[stream.hls][debug] Download of segment 4 complete
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 5 to queue
[stream.hls][debug] Download of segment 5 complete
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 6 to queue
[stream.hls][debug] Download of segment 6 complete
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 7 to queue
[stream.hls][debug] Download of segment 7 complete
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 8 to queue
[stream.hls][debug] Adding segment 9 to queue
[stream.hls][debug] Download of segment 8 complete
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 10 to queue
[cli][info] Player closed
[stream.segmented][debug] Closing worker thread
[stream.segmented][debug] Closing writer thread
[cli][info] Stream ended
[cli][info] Closing currently open stream...

Additional comments, screenshots, etc.

I got the error in the first screenshot once and that's it. All other crashes were due to the log provided above.

Regarding the console image, the execution times used to range from 0.15ms to 0.2ms tops, and now executions times will approach at times 2seconds+. Interestingly enough it always runs great through the commercial. I am not sure if this is any help to the streamlink team but I figured I should provide all the information I possibly could.

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