@param graph the filter graph
@param target the filter(s) to which the command should be sent
"all" sends to all filters
otherwise it can be a filter or filter instance name
which will send the command to all matching filters.
@param cmd the command to sent, for handling simplicity all commands must be alphanumeric only
@param arg the argument for the command
@param ts time at which the command should be sent to the filter
@note As this executes commands after this function returns, no return code
from the filter is provided, also AVFILTER_CMD_FLAG_ONE is not supported.
Queue a command for one or more filter instances.
@param graph the filter graph @param target the filter(s) to which the command should be sent "all" sends to all filters otherwise it can be a filter or filter instance name which will send the command to all matching filters. @param cmd the command to sent, for handling simplicity all commands must be alphanumeric only @param arg the argument for the command @param ts time at which the command should be sent to the filter
@note As this executes commands after this function returns, no return code from the filter is provided, also AVFILTER_CMD_FLAG_ONE is not supported.