On 2021-02-26 17:24, Mark Filipak (ffmpeg) wrote:
On 2021-02-26 20:05, Jim DeLaHunt wrote:
Does input1.mkv in fact have a constant frame rate of 24/1.001
frames/second?
No, it has a constant frame rate of 30/1.001 frames/second.
Sorry, my mistake. I should have said, "Does input1.mkv in fact have a
constant frame rate of 30/1.001 frames/second?"
'ffmpeg -i input.mkv -vf "showinfo" -codec:a copy -codec:s copy -dn
output.mkv'
[Parsed_showinfo_0 @ 0000013c877124c0] n: 1 pts: 33
pts_time:0.033 pos: 10052 fmt:yuv420p sar:32/27 s:240x236 i:P
iskey:0 type:B checksum:3CF10BFE plane_checksum:[64208370 00B13226
C5775659] mean:[25 126 131 ] stdev:[12.8 6.1 1.6 ]
[Parsed_showinfo_0 @ 0000013c877124c0] n: 2 pts: 67
pts_time:0.067 pos: 9213 fmt:yuv420p sar:32/27 s:240x236 i:P
iskey:0 type:B checksum:23A8A65F plane_checksum:[90DC2AA6 37E908C8
779972F1] mean:[27 125 132 ] stdev:[14.8 7.1 1.9 ]
[Parsed_showinfo_0 @ 0000013c877124c0] n: 3 pts: 100
pts_time:0.1 pos: 11086 fmt:yuv420p sar:32/27 s:240x236 i:P
iskey:0 type:B checksum:1CDF7A80 plane_checksum:[089DE80E C537F4C0
8C4E9D94] mean:[29 125 132 ] stdev:[15.2 6.6 2.3 ]
…[elided for brevity]…
[Parsed_showinfo_0 @ 0000013c877124c0] n: 28 pts: 934
pts_time:0.934 pos: 45167 fmt:yuv420p sar:32/27 s:240x236 i:P
iskey:0 type:B checksum:8D724A43 plane_checksum:[CD1CE198 DC377EA5
3D51E9E8] mean:[70 113 148 ] stdev:[46.3 11.6 11.5 ]
[Parsed_showinfo_0 @ 0000013c877124c0] n: 29 pts: 968
pts_time:0.968 pos: 40163 fmt:yuv420p sar:32/27 s:240x236 i:P
iskey:0 type:P checksum:8F6C0D42 plane_checksum:[385DA9F1 7EA37D5A
AD78E5D9] mean:[70 113 148 ] stdev:[46.6 11.6 11.5 ]
[Parsed_showinfo_0 @ 0000013c877124c0] n: 30 pts: 1001
pts_time:1.001 pos: 50467 fmt:yuv420p sar:32/27 s:240x236 i:P
iskey:0 type:B checksum:B511B7BA plane_checksum:[9C9A49A0 B1D583BA
FA0EEA51] mean:[70 113 148 ] stdev:[46.5 11.4 11.6 ]
This output shows a stream which has a varying frame rate. The change in
pts_time is not constant from frame to frame.
Can you get some output which shows the timebase value, or the frame
times, of input1.mkv, showing that there is a timebase which is a
multiple of 1.001/30, or showing that the time value of each frame
increments by a constant amount?
So far, the output you show is consistent with an input1.mkv which has a
varying frame rate that is 30/1.001 fps, distorted to fit a 1/1000
timebase. Can you show a diagnostic which eliminates that possibility?
—Jim DeLaHunt
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