[Libav-user] Fwd: Re: the difference between mjpeg in ffmpeg and libjpeg
Carl Eugen Hoyos
cehoyos at ag.or.at
Fri Dec 11 00:16:22 CET 2015
On Thursday 03 December 2015 05:51:42 am qw wrote:
> JPEG has adopted many standards. There are several jpeg codec in ffmpeg,
> such as mjpeg, mjpegb, ljpeg, jpegls. libjpeg is another open source of
> jpeg codec.
> what's difference between mjpeg in ffmpeg and libjpeg?
It's like the difference between Porsche and Ferrari. They do not share
any parts, both produce cars.
> Does libjpeg support all JPEG standards/algorithms?
To the best of my knowledge: No, but I am not a libjpeg developer.
> In libjpeg, jpeg encoder accepts quality level as input parameter, while
> mjpeg uses bit rate as input parameter in ffmpeg.
FFmpeg's jpeg encoder allows both bitrate and quantizer as input parameter.
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