Hi Moritz, Thanks for your helpful reply. I change the encoders settings and the file size now similar.
Cheers, Ali On Tue, Sep 11, 2018 at 5:32 PM Moritz Barsnick <barsn...@gmx.net> wrote: > On Tue, Sep 11, 2018 at 16:38:37 +0430, Ali Shirvani wrote: > > Is this variation in output size normal? or should I tune some settings? > > Yes, it's normal - different encoders use different default settings. > > Yes, you should tune your settings. > > If you want to achieve similar size, use the "-b:v" (video bitrate) > command line parameter. Yet quality may differ significantly, depending > on the effort and the encoding methods used by the encoder. (Even at > somewhat constant quality, you can vary the size of the libx264 > encoding significantly by using different "-preset" options.) > > If you want to achieve identical quality, you need to fiddle with the > available options. libx264 offers "-crf" for its (default) variable > bitrate encoding (also for fixed). Other H.264 encoders probably use > other options (such as "-q:v", but its impact may differ depending on > encoder) and may even default to constant bitrate. Check in the manual > or with: > > $ ffmpeg -h encoder=encoder_name > > Cheers, > Moritz > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".