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I have downloaded 18 videos of a movie from YouTube in .flv format.

Which software can I use to merge all 18 videos into one?

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1 Answer

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I'd go with Avidemux.

First I'd convert them into raw video, merge them, encode them into x264+ogg(mp4). But you should grab those movie files in better quality which already comes in mp4. Tell us where did you get it (if its a video sharing site like YouTube), there is a way I guess to get a better copy.

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I have said, i downloaded all from youtube in flv format. – Sarfraz May 18 '10 at 9:56
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Oh sorry. Try using deturl.com or 'youtube-dl' or something which grabs the best format (which should be in mp4). – Shiki May 18 '10 at 10:20
+1 thanks for that link. – Sarfraz May 18 '10 at 11:16
I just got sent to this thread when I tried to ask a question on this--the supplied answer does NOT work for me. I get a warning about H.264 B-frames. I'm left with a choice between bad stuttering or video that plays far faster than it should. – Loren Pechtel Oct 25 '11 at 20:33
@LorenPechtel - I just accept those messages and I found no problem with the video speeds at all. You may want to play with the filters, especially the ones about speed. Maybe you try to join a specific, weird video file. – Shiki Oct 25 '11 at 22:20
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