x264

x264 is a codec library for H264/AVC video streams.

Features:

• 8x8 and 4x4 adaptive spatial transform
• Adaptive B-frame placement
• B-frames as reference / arbitrary frame ordering
• CAVLC / CABAC
• includes all types of macroblocks (16x16, 8x8, 4x4 and PCM)
• Inter P: all partitions (from 16x16 to 4x4)
• Inter P: all partitions (16x16 to 4x4)
• Folding (MBAFF)
• Data flow control
• and other useful features!