Event playback and navigation issues

[BurningTheSky]

Describe Your Environment

• Version of ZoneMinder: 1.37.0
• How you installed ZoneMinder: Followed wiki: https://wiki.zoneminder.com/How_to_Install_ZoneMinder-Master_,v_1.35.4_on_UBUNTU_20.04_LTS_%28_Focal_Fossa%29
• Full name and version of OS: Ubuntu 20.04.2 LTS
• Browser name and version: Firefox 88.0.1 and Chrome 91.0.4472.77

Describe the bug When I try to play an event from a camera it plays very slowly even when on 5x speed. It's more seconds per frame than frames per second. If I try and skip forward in a recording to the motion the slider is inaccurate, if it moves, and then doesn't resume playback, I don't see any errors in zm and the issues only started after upgrading from 1.35

To Reproduce Steps to reproduce the behavior:

1. Go to the events for a camera doing mocord
2. Select an event to play
3. Skip forwards

Expected behavior Smooth playback of events

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[BurningTheSky]

Started to see some errors:

Debug Logs

Date/Time | Component | Server | PID | Level | Message | File | Line
29/05/2021 09:04 | web_js |   | 30039 | ERR | getCmdResponse stream error: No   data to read from socket - checkStreamForErrors() | ?view=event&eid=335&filter%5BQuery%5D%5Bterms%5D%5B0%5D%5Battr%5D=MonitorId&filter%5BQuery%5D%5Bterms%5D%5B0%5D%5Bop%5D=%3D&filter%5BQuery%5D%5Bterms%5D%5B0%5D%5Bval%5D=4&sort_field=StartDateTime&sort_asc=1&codec=MJPEG | '-
29/05/2021 09:04 | web_php |   | 35210 | ERR | No data to read from socket | /usr/share/zoneminder/www/includes/functions.php | 1902
29/05/2021 09:04 | web_php |   | 35210 | ERR | Timed out waiting for msg   /run/zm/zms-509848s.sock | /usr/share/zoneminder/www/ajax/stream.php | 95
29/05/2021 09:04 | web_js |   | 46821 | ERR | getCmdResponse stream error: No   data to read from socket - checkStreamForErrors() | ?view=event&eid=335&filter%5BQuery%5D%5Bterms%5D%5B0%5D%5Battr%5D=MonitorId&filter%5BQuery%5D%5Bterms%5D%5B0%5D%5Bop%5D=%3D&filter%5BQuery%5D%5Bterms%5D%5B0%5D%5Bval%5D=4&sort_field=StartDateTime&sort_asc=1&codec=MJPEG | '-
29/05/2021 09:04 | web_php |   | 30039 | ERR | No data to read from socket | /usr/share/zoneminder/www/includes/functions.php | 1902
29/05/2021 09:04 | web_php |   | 30039 | ERR | Timed out waiting for msg   /run/zm/zms-509848s.sock | /usr/share/zoneminder/www/ajax/stream.php | 95
29/05/2021 09:04 | web_php |   | 46821 | ERR | No data to read from socket | /usr/share/zoneminder/www/includes/functions.php | 1902
29/05/2021 09:04 | web_php |   | 46821 | ERR | Timed out waiting for msg   /run/zm/zms-507019s.sock | /usr/share/zoneminder/www/ajax/stream.php | 95
29/05/2021 09:04 | zms_e335 |   | 46939 | ERR |   | zm_ffmpeg_input.cpp | 190
29/05/2021 09:04 | zms_e335 |   | 46939 | ERR |   | zm_ffmpeg_input.cpp | 190
29/05/2021 09:04 | zms_e335 |   | 46911 | ERR |   | zm_eventstream.cpp | 579
29/05/2021 09:04 | zms_e335 |   | 46911 | ERR |   | zm_eventstream.cpp | 579

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