Mediafiles compression program [closed]

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Can anybody recommend a good compression programm wich i can use to compress pictures/videos? i cant really reduce their size during transport.

thank you.

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http://www.stuffit.com/ - jpeg,tiff,mp3,pdf
http://soundslimmer.com/ - mp3
http://www.winzip.com/comp_info.htm - jpeg,wav

http://schnaader.info/precomp.php - deflate-based formats, jpeg
http://www.elektronik.htw-aalen.de/packjpg/ - jpeg
http://paq8.hys.cz/ - jpeg,bmp,wav

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http://www.klaimsoft.com/winuha/ comes to mind.

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Pictures and videos are two wholly different things. Unless you want lossless compression but it is hard to compress video/audio files more than +-10% as the algorithms behind the file formats are already pretty effective.

For transcoding (putting into a different format) video files Mediacoder is free and versatile, but hard to grasp for beginners. There are 3 main things that determine file size and quality: Coded, resolution and bitrate. For codec you should choose a modern one like WebM or H.264, or at least Xvid or another MPEG4 codec. Resolution determines the number of pixels and is pretty straightforward. Bitrate mean number of bits per frame and depends on the resolution and codec used.

For pictures generally only resolution is the problem: cameras make pictures in resolutions far larger than a computer screen can show. For just general showing (not printing) 1024x786 or around is usually enough. You can resize pictures through special batch resizers, a free one from Microsoft is avaialable for Windows XP.