Thirty years ago I tape recordered some hundreds of old genealogy photos, which I now plan to convert from SD-DV files to burn on DVD video discs. The camcordings were made with fade in/out, zoom closeups and pan effects, which fit well at 2x playback speed and with additional pause/play navigation on DVD videos. Signal/noise at 2x speed with same fps and bitrate (halph of the fps are dropped), should result in output with 1/2 playback duration and equivalent quality as normal speed. Yet I wonder if it possible in some way to achieve better quality if also 2x bitrate and fps are possible to utilize temporarily as a better quality base (downsampling), even if DVD video limits the fps and bitrate? Here are my test samples so far: du -sh dv95* 1) 2,0G dv95.dv (input source) 2) 1,1G dv95_2x_25fps.dv 3) 2,0G dv95_2x_50fps.dv 4) 218M dv95_2x_25fps.mpg 5) 218M dv95_2x_50fps.mpg 1) ffprobe -hide_banner dv95.dv (source DV, Duration: 00:09:56.48) [dv @ 0x55d65d6ca080] Estimating duration from bitrate, this may be inaccurate Input #0, dv, from 'dv95.dv': Metadata: timecode : 00:00:00:00 Duration: 00:09:56.48, start: 0.000000, bitrate: 28800 kb/s Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3], 28800 kb/s, 60k fps, 25 tbr, 60k tbn Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s ffmpeg conversions using the FFmpeg setpts filter http://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20vi... 2) ffmpeg -i dv95.dv -vf "setpts=0.5*PTS" -an dv95_2x_25fps.dv ffprobe -hide_banner dv95_2x_25fps.dv [dv @ 0x5582eb685080] Estimating duration from bitrate, this may be inaccurate Input #0, dv, from 'dv95_2x_25fps.dv': Metadata: timecode : 00:00:00:00 Duration: 00:04:58.32, start: 0.000000, bitrate: 28800 kb/s Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3], 28800 kb/s, 60k fps, 25 tbr, 60k tbn 3) I wonder why the Duration is still 00:09:56.52 here ? ffmpeg -hide_banner -i dv95.dv -r 50 -vf "setpts=0.5*PTS" -an dv95_2x_50fps.dv ffprobe -hide_banner dv95_2x_50fps.dv [dv @ 0x55fe0b5bb080] Estimating duration from bitrate, this may be inaccurate Input #0, dv, from 'dv95_2x_50fps.dv': Metadata: timecode : 00:00:00:00 Duration: 00:09:56.52, start: 0.000000, bitrate: 28800 kb/s Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3], 28800 kb/s, 60k fps, 25 tbr, 60k tbn 4) ffmpeg -hide_banner -i dv95.dv -f dvd -target pal-dvd -aspect 4:3 -vf "setpts=0.5*PTS" -an dv95_2x_25fps.mpg ffprobe -hide_banner dv95_2x_25fps.mpg [mpeg @ 0x55a330208080] start time for stream 0 is not set in estimate_timings_from_pts Input #0, mpeg, from 'dv95_2x_25fps.mpg': Duration: 00:04:58.32, start: 0.540000, bitrate: 6115 kb/s Stream #0:0[0x1bf]: Data: dvd_nav_packet Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn Side data: cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008 vbv_delay: N/A Unsupported codec with id 98312 for input stream 0 5) ffmpeg -hide_banner -i dv95.dv -f dvd -target pal-dvd -r 50 -vf "setpts=0.5*PTS" -an dv95_2x_50fps.mpg ffprobe -hide_banner dv95_2x_50fps.mpg [mpeg @ 0x555e13da2080] start time for stream 0 is not set in estimate_timings_from_pts Input #0, mpeg, from 'dv95_2x_50fps.mpg': Duration: 00:04:58.26, start: 0.520000, bitrate: 6118 kb/s Stream #0:0[0x1bf]: Data: dvd_nav_packet Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 16:15 DAR 4:3], 50 fps, 50 tbr, 90k tbn Side data: cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008 vbv_delay: N/A Unsupported codec with id 98312 for input stream 0