On 08 Mar 2016, at 17:54, Sreenath BH <bhsreen...@gmail.com> wrote: > On 3/8/16, Moritz Barsnick <barsn...@gmx.net> wrote: >> Hi Sreenath, >> >> On Mon, Mar 07, 2016 at 22:28:32 +0530, Sreenath BH wrote: >>> As can be seen the two outputs differ in the H264 profile(High vs >>> Main), bitrate, the pixel format and of course the file sizes. >> >> Different encoders can have different defaults. It appears that nvenc >> defaults to "Main", while libx264 defaults to preset "medium" which >> apparently implies "High" (but might depend on other things). >> >> If you want the same profiles and levels, you will need to request them >> explicitly. >> >> The same thing goes for the quality: libx264 defaults to crf=23, I >> don't know about nvenc. Furthermore, encoders can trade off quality (or >> size) for conversion speed. So if you want the same size, you have to >> specify "-b:v" explicitly. If you want the same quality, I guess you >> may have to experiment with the settings available to find something >> comparable. >> >> And finally, don't expect the same results as soon as you have the same >> profile, levels and bitrate (or quality). One encoder will be more >> efficient than the other, or give different results in different scene >> scenarios. >> >> Does this clarify some things? >> >> Moritz >> _______________________________________________ >> ffmpeg-user mailing list >> ffmpeg-user@ffmpeg.org >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >> > > Hi > > Thanks for your comments. I understand that two codecs even with same > presets and other similar settings can produce differing output. > > I wanted to know if there was a way to achieve the results I wanted > with the codec we prefer to use (nvidia) because it have significant > speed increase. As with most things in life, the advantage at one side has a downside somewhere else. > > thanks, > Sreenath > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
_______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
