On 2021-02-27 00:55, Jim DeLaHunt wrote:
On 2021-02-26 18:36, Mark Filipak (ffmpeg) wrote:
On 2021-02-26 20:42, Jim DeLaHunt wrote:
On 2021-02-26 17:24, Mark Filipak (ffmpeg) wrote:
'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.
That's exactly the point. It is not constant because ffmpeg calculates frame times in integer
milliseconds, and thereby truncates or rounds.…
Mark, what makes you so sure that it is FFmpeg which is truncating or rounding?
The issue, Jim, is not with the MKV above. The issue is with the next video in the work flow: An MKV
that was made from the MKV above but with '-vf settb=expr=1/360000,showinfo'. That 'showinfo' should
have shown a 360000Hz time base. It does, but the PTSs are wrong.
I can understand your confusion. It's a complex case. Would you like me to rerun all the steps while
posting the step-wise results here? I don't mind.
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