Hello Marton, I did use mdb bits and rt. But it didnt get better in my opinion. Maybe I am too sensible for blocking artefacts. mdb is my last option to improve the mpeg2 encoding. Right?
Am Di., 23. Okt. 2018 um 13:38 Uhr schrieb Marton Balint <[email protected]>: > > > On Tue, 23 Oct 2018, Chris von Görstinger wrote: > > > Hello > > > > I am using this syntax to generate a XDCAMHD422 file: > > > > -c:v mpeg2video -r 25 -pix_fmt yuv422p -s 1920x1080 -aspect 16:9 -minrate > > 50000k -maxrate 50000k -b:v 50000k -g 12 -flags +ildct+ilme -intra_vlc 1 > > -dc 10 -non_linear_quant 1 -bf 2 -qmin 1 -qmax 12 -top 1 -bufsize > 17825792 > > -rc_init_occupancy 17825792 -rc_min_vbv_use 1 -rc_max_vbv_use 1 > > -sc_threshold 1000000000 -lmin "1*QP2LAMBDA" -vtag xd5c -color_range tv > > -color_primaries bt709 -color_trc bt709 -c:a pcm_s24le -ar 48000 -f mxf > > -timecode 12:34:56:11 -max_muxing_queue_size 1024 -metadata > > "creation_time=2015-10-28T15:37:56" > > > > I mentioned by checking frame by frame with an editing tool (after > effects) > > that there are some frame with very much blockingess. > > I tried with qmin/qman different values and surprisingly when using > qmin=4 > > then the quality gets better. > > > > With qmin4 there are still tiny blocks (looks better than qmin=1), and I > > now from other transcoders that the frames were these tiny blocks happen > > CAN BE better encoded so that no blocks are visible for the whole GOP. > > My questions are: > > 1.) Why do I get a better quality with qmin=4 instead of qmin=1? -> Maybe > > is datarate saved with qmin=4 which can be used for other frames were it > is > > needed more? > > That would be my guess too. > > > 2.) How can I improve the encoding a little bit more here in ffmpeg > > regarding the picture quality? > > You can try using -mbd bits, it's going to be significantly slower, but in > my experience it provides better quality. > > Regards, > Marton > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". -- -------------------------------------------------------------------------------------------------------- Student der Fachhochschule für Telekommunikation und Medien St. Pölten Student of the university of applied sciences St. Pölten Christoph Gerstbauer St. Paul-Gasse 6/4 A-3500 Krems an der Donau phone: +43 (0) 699 - 11 658 238 email: [email protected] [email protected] [email protected] ICQ: 292233201 _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
