Set read/write permissions for the output frames.

These filters are mainly aimed at developers to test direct path in the following filter in the filtergraph.

The filters accept the following options:

mode

Select the permissions mode.

It accepts the following values:

none

Do nothing. This is the default.

ro

Set all the output frames read-only.

rw

Set all the output frames directly writable.

toggle

Make the frame read-only if writable, and writable if read-only.

random

Set each output frame read-only or writable randomly.

seed

Set the seed for the random mode, must be an integer included between 0 and UINT32_MAX. If not specified, or if explicitly set to -1, the filter will try to use a good random seed on a best effort basis.

Note: in case of auto-inserted filter between the permission filter and the following one, the permission might not be received as expected in that following filter. Inserting a format or aformat filter before the perms/aperms filter can avoid this problem.