The encoder writes a PADDING block of 8192 bytes by default (or 65536 bytes if the input audio stream is more than 20 minutes long).
FLAC v1.3.2 Advanced Settings:path: C:\FLAC132\win64\flac.exeparameters: -%M -V - -o %Omodes: 0 1 2 3 4 5 6 7 8name: FLAC v1.3.2
In any case, if no inputfile is specified, stdin is assumed. If only one inputfile is specified, it may be "-" for stdin. When stdin is used as input, flac will write to stdout.
If you are encoding/decoding from stdin to a file, you should use the -o option like so: flac [options] -o outputfile
"-" (without the quotes) = stdin (standard input). %O = stdout (standard output). %M = inserts value from Modes.