How to transcode ts files to flv?

[Strandlaeufer]

In my collection are many .ts files from my tv card. Some are in SD some in HD. While there are no problems in transcoding .mkv or .avi files
I tried the trancoding parameter "ffmpeg -ss %o -i %s -async 1 -b %bk -s %wx%h -ar 44100 -ac 2 -v 0 -f flv -" but this doesn´t work.
If I repack the .ts file to a mkv file there are no problems.
Please can you tell me the correct parameters for .ts files?