[FFmpeg-user] low quality video using raspberry pi

Carl Eugen Hoyos cehoyos at ag.or.at
Sun Feb 21 13:13:54 CET 2016

shuvro majumder <shuvromaj <at> gmail.com> writes:

> ffmpeg -f video4linux2 -s 320*240 -r 20 -i /dev/video0 out.mpg

(-r 20 may be wrong, -s 320x240 looks wrong.)

If this is meant as a fast intermediate step to loose as 
little quality as possible, use -qscale 2 -mbd 2
If this has size constraints, please add -b with an 
appropriate bitrate for your size constraints.

> ffmpeg -i out.mpg -c:v libx264 -preset slower -crf 30 -c:a copy output.h264

If you have size constraints (you wrote that you have them) 
do not use a constant quality but specify a bitrate.

Note that the -h264 file format that you specified does 
not support audio, so -acodec copy makes no sense.

Carl Eugen

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