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I've donwloaded some youtube videos that I want to join. I joined them with mkvmerge, but in the joined video, there are ~5 seconds skips (in VLC the second counter stops and then jumps 5 seconds) at the start of each video I joined (even at the start). Is there another way to join them so I won't have this problem?

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Do other players have this problem as well or only VLC? –  Volodya Jul 18 at 13:28
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Try a video editor like Lightworks to join them into one video, there you can cut any black frames and won't have to deal with possible glitches introduced by muxing different videos into one stream.

If your videos are indeed webm and not h264 you might need transcode them into another codec (f.e. with ffmpeg), a production codec like MJPEG or any lossless codec might be suitable as an intermediate codec so you don't loose much visual quality after exporting your finished video.

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I've tried using video editors to join videos in the past, but these programs allways try to reencode the videos. Also I was told to use mkvmerge precisely to avoid recoding them to anything (even MJPEG) so they didn't lose quality. –  noName Jun 26 at 15:27
    
Sure muxing is always the lossless method. You can also use ffmpeg to cut the file without re-encoding. Might be a bette solution than mkvmerge. –  Professor Sparkles Jun 26 at 18:45
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