HTTP error when upload file (mp4)

Hi,

I’ve an installation where i’ve an upload problem.

When i try to upload a picture in media library : ok, no problem.
When i try to upload a pdf file : i’ve a “http error” but pdf file, when i refresh, is uploaded.
When i try to upload a mp4 file : i’ve a “http error” and file is not uploaded.

I’m under php7.0.12, with :

Php settings :

• memory_limit 4048M (Default)
• max_execution_time 600 (Default)
• max_input_time 600 (Default)
• post_max_size 1024M (Default)
• upload_max_filesize 1024M (Default)
• opcache.enable

Include this in Additional directives for HTTP & HTTPS :
<IfModule mod_fcgid.c>
FcgidMaxRequestLen 1073741824
FcgidMaxRequestsPerProcess 100
FcgidProcessLifeTime 7200
</IfModule>

And .htaccess of domain :

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /cassb/
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /cassb/index.php [L]
</IfModule>

<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>

SetEnv MAGICK_THREAD_LIMIT 1

# END WordPress

Thx for your help…