Error when playing video from webdav folder

Nextcloud version (eg, 12.0.2) : 13.04
Operating system and version (eg, Ubuntu 17.04) : Debian 9.1
Apache or nginx version (eg, Apache 2.4.25) :Apache 2.4.25
PHP version (eg, 7.1) : PHP 7.0.19

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N) : N

Steps to replicate it:

  1. mount webdav folder on windows.
  2. go to webdav folder and open the video file.
  3. media player classic error “file not found”

the same situation on android tv box

The output of your Nextcloud log in Admin > Logging :

no log associated with this situation

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

$CONFIG = array (
  'instanceid' => 'xxx',
  'passwordsalt' => 'xxx',
  'secret' => 'xxx',
  'trusted_domains' =>
  array (
    0 => 'xxx',
    1 => 'xxx.xxx.xxx.xxx',
  ),
  'datadirectory' => '/dysk',
  'overwrite.cli.url' => 'https://xxx',
  'dbtype' => 'mysql',
  'version' => '13.0.4.0',
  'dbname' => 'xxx',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'xxx',
  'dbpassword' => 'xxx',
  'installed' => true,
  'mail_from_address' => 'admin',
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'PLAIN',
  'mail_domain' => 'xxx',
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => 'localhost',
    'port' => 0,
  ),
  'mail_smtphost' => 'smtp.gmail.com',
  'mail_smtpport' => '587',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 0,
  'mail_smtpsecure' => 'tls',

The output of your Apache/nginx/system log in /var/log/____ :

[Tue Aug 28 00:09:10.116086 2018] [ssl:warn] [pid 18365] AH01909: 192.68.10.27:443:0 server certificate does NOT include an ID which matches the server name
[Tue Aug 28 00:09:10.116695 2018] [mpm_prefork:notice] [pid 18365] AH00163: Apache/2.4.25 (Debian) OpenSSL/1.0.2l configured -- resuming normal operations
[Tue Aug 28 00:09:10.116795 2018] [core:notice] [pid 18365] AH00094: Command line: '/usr/sbin/apache2'
[Wed Aug 29 00:08:06.273617 2018] [mpm_prefork:notice] [pid 18365] AH00171: Graceful restart requested, doing restart
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this mess$