If I use -o as parameter, all videos are downloaded one more time.

[Jimmm]

I want to name my videos like "name.mp4" without ID.

If I use -l or -t parameter, already downloaded videos will be skipped, but ID will be used as a part of a filename too.

If I use -o %(title)s.%(ext)s, all videos will be downloaded one more time and then renamed.

Is it possible to use -o parameter withot redownloads?

[phihag]

I'm not quite certain what your problem is. If you specify the -w parameter, youtube-dl will skip any files that already exist, no matter whether you use -o, -t, or -l.

If you have already downloaded the files and want to rename them, youtube-dl is not the right tool for the job. The shell is:

for f in *.mp4 *.flv *.webm; do mv "$f" $(echo "$f" | sed 's#-[a-zA-Z0-9]*\.#.#'); done