ffmpeg -y -i sample.avi -threads 2 -s 320x240 -r 30.00 -threads 1 -pix_fmt yuv420p -g 300 -qmin 3 -b 512k -async 50 -ar 11025 -ac 1 -ab 16k outputfile.flv
ffmpeg -y -i sample.avi -threads 2 -s 320x240 -r 29.97 -threads 1 -pix_fmt yuv420p -g 300 -qmin 3 -b 512k -async 50 -ar 44100 -ac 2 -ab 128k outputfile.flv
- -y: Overwrite output files
- -i ‘inputfile.avi’: Input filename
- -threads 2: Thread count
- -s 320×240: Set frame size
- -r 30.00: Set frame rate (fps)
- -threads 1: Thread count (again)
- -pix_fmt yuv420p: Set pixel format
- -g 300: Set the group of pictures size
- -qmin 3: minimum video quantizer scale (VBR)
- -b 512k: Set the video bitrate in bits/s
- -async 50: Audio sync method. “Stretches/squeezes” the audio stream to match the timestamps, the parameter is the maximum samples per second by which the audio is changed.
- -acodec mp3: Force audio codec to codec
- -ar 11025: Set the audio sampling frequency
- -ac 1: Set the number of audio channels
- -ab 16k: Set the audio bitrate in bits/s
- outputfile.flv: Is the outputfile
from : http://www.victorcastelan.net/convert-avi-mpeg-files-to-flv-with-ffmpeg/
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