To see this technique applied using the older H.264 format, see this answer, quoted below for convenience:Ĭalculate the bitrate you need by dividing your target size (in bits) by the video length (in seconds).
ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4 Note that lower CRF values correspond to higher bitrates, and hence produce higher quality videos. To use it, replace the libx264 codec with libx265, and push the compression lever further by increasing the CRF value - add, say, 4 or 6, since a reasonable range for H.265 may be 24 to 30. Since 2013 a video format much better than H.264 is widely available, namely H.265 (better in that it compresses more for the same quality, or gives higher quality for the same size). Update 2020: This answer was written in 2009.
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