Here is a list of some of the input video codecs that SlideShare supports:

• H.264
• Theora
• VP8, VP7, VP6, VP5, VP4, VP3
• MPEG-4 ASP, DivX, XviD
• MPEG-1, MPEG-2
• H.263, H.263+, Flash Video
• Windows Media Video 7, 8, and 9 (WMV1, WMV2, WMV3)
• Apple ProRes 422
• Real Video
• YUV
• Schroedinger, Dirac
• Sorenson, Cinepack, RPZA, Indeo, MJPEG

Here is a list of some of the input audio codecs that SlideShare supports:

• MP3
• AAC
• WMA
• WAV
• AC3/DTS
• RealAudio
• Ogg Vorbis, Speex, FLAC
• AMR-NB, AMR-WB
• ALAW/ULAW, GSM, PCM, ADPCM

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Some known unsupported codecs are given below:

• Apple Intermediate
• HDV 720p60
• ProRes 4444
• Go2Meeting3 (G2M3)

In case you are using a video file from GoToMeeting, you might need to convert to a different format since this is not directly supported. Click on this link to learn more about converting GoToMeeting video output to a different format. It is also possible to record GoToMeeting meetings in WMV format rather that their proprietary output format. Click on this link for more details.