proc_open(): Exec failed: No such file or directory at /snap/nextcloud/38457/htdocs/lib/private/Preview/Movie.php#143

[faxotherapy]

Hi, every time I run nextcloud.occ preview:generate-all, I've got the following error message:

proc_open(): Exec failed: No such file or directory at /snap/nextcloud/38457/htdocs/lib/private/Preview/Movie.php#143

Unfortunately, I still have no video preview thumbnail under 27.1.3 (installed via snap) even though the following installed/added:

• Imagemagick and imagemagick-common
• FFmpeg installed at regular /usr/bin/ path
• I installed Preview Generator app and generated the previews via CLI. I added the cron job too. nextcloud.occ preview:generate-all -vvv
• I added the following in config.php as well:

  'preview_ffmpeg_path' => '/usr/bin/ffmpeg',¬
  'enable_previews' => true,¬
  'enabledPreviewProviders' =>¬
  array (¬
  0 => 'OC\\Preview\\TXT',¬
  1 => 'OC\\Preview\\MarkDown',¬
  2 => 'OC\\Preview\\OpenDocument',¬
  3 => 'OC\\Preview\\PDF',¬
  4 => 'OC\\Preview\\Image',¬
  5 => 'OC\\Preview\\TIFF',¬
  6 => 'OC\\Preview\\SVG',¬
  7 => 'OC\\Preview\\Font',¬
  8 => 'OC\\Preview\\MP3',¬
  9 => 'OC\\Preview\\Movie',¬
  10 => 'OC\\Preview\\MKV',¬
  11 => 'OC\\Preview\\MP4',¬
  12 => 'OC\\Preview\\AVI',¬
  ),

• Using single backslahes instead of double backslashes.

[faxotherapy]

Solved. Read here.