for %%a in ("*.mp4") do (
ffmpeg -i "%%a" -c copy -bsf:v h264_mp4toannexb -f mpegts tmpvideo.ts 
ffmpeg -i "concat:tmpvideo.ts|tmpvideo.ts|tmpvideo.ts" -c copy -bsf:a aac_adtstoasc "uzunvideo\%%a"
del tmpvideo.ts
)