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compression - Reducing video size with same format and reducing frame size -
this question might basic
is there way reduce frame size/rate of lossy compressed (wmv, mpeg) format, smaller video, of lesser size, same format.
are there open source or proprietary apis this?
ffmpeg provides functionality. need run someting like
ffmpeg -i <inputfilename> -s 640x480 -b 512k -vcodec mpeg1video -acodec copy <outputfilename>
for newer versions of ffmpeg need change -b
-b:v
:
ffmpeg -i <inputfilename> -s 640x480 -b:v 512k -vcodec mpeg1video -acodec copy <outputfilename>
to convert input video file video size of 640 x 480 , bitrate of 512 kilobits/sec using mpeg 1 video codec , copying original audio stream. of course, can plug in values need , play around size , bitrate achieve quality/size tradeoff looking for. there ton of other options described in documentation
run ffmpeg -formats
or ffmpeg -codecs
list of of available formats , codecs. if don't have target specific codec final output, can achieve better compression ratios minimal quality loss using state of art codec h.264.
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