I had a brainwave...
The 4 second video is in DTS-order. That's unusual, but that's what Criterion
gave us.
What if I could rearrange the packets to PTS-order?
If showinfo and show_frames then agreed with framecrc, that would tell the
whole story, wouldn't it?
Is that possible? Is it possible to change the physical order in the packet
stream?
--Mark.
Below is what I actually filed at trac.ffmpeg
Summary of the bug:
I made a 4 second clip having 99 actual frames. Physical order is DTS.
VLC and PowerDVD play the clip perfectly.
'-f framecrc' & packet analyzer agree: 99 frames, same DTSes & PTSes.
'-vf showinfo' disagree: 53 frames, gap & duplicates.
'-show_frames' disagree: 54 frames, gap & duplicates.
'-vf showinfo' & '-show_frames' disagree substantially.
Other effects:
MPV exhibits a 2 second glitch that matches the gap.
'-ss' and '-to' exhibit the same sorts of problems.
__packet analyzer__ _____framecrc______ ___showinfo___
______show_frames_______
___DTS___ ___PTS___ ___DTS___ ___PTS___ N ___PTS___ N ___DTS___ ___PTS___
504126135 504137396 504126135 504137396 0 504137396 I 0 504148657
504137396 I
504129888 504129888 504129888
504133642 504133642 504133642
504137396 504148657 504137396 504148657 3 504148657 P 3 504159918
504148657 P
504141150 504141150 504141150 1 504141150 B 1 504152411
504141150 B
504144903 504144903 504144903 2 504144903 B 2 504156165
504144903 B
504148657 504156165 504148657 504156165 5 504156165 P 5 504167426
504156165 P
504152411 504152411 504152411 4 504152411 B 4 504163672
504152411 B
504156165 504167426 504156165 504167426 8 504167426 P 8 504178687
504167426 P
504159918 504159918 504159918 6 504159918 B 6 504171180
504159918 B
504163672 504163672 504163672 7 504163672 B 7 504174933
504163672 B
504167426 504174933 504167426 504174933 10 504174933 P 10 504186195
504174933 P
504171180 504171180 504171180 9 504171180 B 9 504182441
504171180 B
504174933 504186195 504174933 504186195 13 504186195 P 13 504197456
504186195 P
504178687 504178687 504178687 11 504178687 B 11 504189948
504178687 B
504182441 504182441 504182441 12 504182441 B 12 504193702
504182441 B
504186195 504197456 504186195 504197456 16 504197456 P 16 504208717
504197456 P
504189948 504189948 504189948 14 504189948 B 14 504201210
504189948 B
504193702 504193702 504193702 15 504193702 B 15 504204963
504193702 B
504197456 504204963 504197456 504204963 18 504204963 P 18 504216225
504204963 P
504201210 504201210 504201210 17 504201210 B
504204963 504216225 504204963 504216225 22 504396404
504216225 P
504208717 504208717 504208717 19 504208717 B 19 504219978
504208717 B
504212471 504212471 504212471 20 504212471 B 20 504385143
504212471 B
504216225 504223732 504216225 504223732 26 504411419
504223732 I
504219978 504219978 504219978 24 504403911
504219978 B
===================== SPLICE HERE ======================
504223731 504227485 504223731 504227485
504227485 504234993 504227485 504234993
504231239 504231239 504231239
504234993 504246254 504234993 504246254
504238746 504238746 504238746
504242500 504242500 504242500
504246254 504257515 504246254 504257515
504250008 504250008 504250008
504253761 504253761 504253761
504257515 504265023 504257515 504265023
504261269 504261269 504261269
504265023 504276284 504265023 504276284
504268776 504268776 504268776
504272530 504272530 504272530
504276284 504287545 504276284 504287545
504280038 504280038 504280038
504283791 504283791 504283791
504287545 504295053 504287545 504295053
504291299 504291299 504291299
504295053 504306314 504295053 504306314
504298806 504298806 504298806
504302560 504302560 504302560
504306314 504317575 504306314 504317575
504310068 504310068 504310068
504313821 504313821 504313821
504317575 504325083 504317575 504325083
504321329 504321329 504321329
504325083 504332590 504325083 504332590
504328836 504328836 504328836
504332590 504340098 504332590 504340098
504336344 504336344 504336344
504340098 504347605 504340098 504347605
504343851 504343851 504343851
504347605 504355113 504347605 504355113
504351359 504351359 504351359
504355113 504362620 504355113 504362620
504358866 504358866 504358866
504362620 504370128 504362620 504370128
504366374 504366374 504366374
504370128 504377635 504370128 504377635
504373881 504373881 504373881
504377635 504385143 504377635 504385143
504381389 504381389 504381389
504385143 504396404 504385143 504396404 22 504396404 P 23 504400158
504396404 P
504388896 504388896 504388896
504392650 504392650 504392650 21 504392650 B 21 504392650
504392650 B
504396404 504407665 504396404 504407665 25 504407665 B 28 504418926
504407665 I
504400158 504400158 504400158 23 504400158 P 25 504407665
504400158 B
504403911 504403911 504403911 24 504403911 B 27 504415173
504403911 B
504407665 504418926 504407665 504418926 28 504418926 I 31 504430188
504418926 P
504411419 504411419 504411419 26 504411419 I 29 504422680
504411419 B
504415173 504415173 504415173 27 504415173 B 30 504426434
504415173 B
504418926 504426434 504418926 504426434 30 504426434 B 33 504437695
504426434 P
504422680 504422680 504422680 29 504422680 B 32 504433941
504422680 B
504426434 504433941 504426434 504433941 32 504433941 B 35 504445203
504433941 P
504430188 504430188 504430188 31 504430188 P 34 504441449
504430188 B
504433941 504445203 504433941 504445203 35 504445203 P 38 504456464
504445203 P
504437695 504437695 504437695 33 504437695 P 36 504448956
504437695 B
504441449 504441449 504441449 34 504441449 B 37 504452710
504441449 B
504445203 504456464 504445203 504456464 38 504456464 P 41 504467725
504456464 P
504448956 504448956 504448956 36 504448956 B 39 504460218
504448956 B
504452710 504452710 504452710 37 504452710 B 40 504463971
504452710 B
504456464 504467725 504456464 504467725 41 504467725 P 44 504478986
504467725 P
504460218 504460218 504460218 39 504460218 B 42 504471479
504460218 B
504463971 504463971 504463971 40 504463971 B 43 504475233
504463971 B
504467725 504475233 504467725 504475233 43 504475233 B 46 504486494
504475233 P
504471479 504471479 504471479 42 504471479 B 45 504482740
504471479 B
504475233 504486494 504475233 504486494 46 504486494 P
504478986 504478986 504478986 44 504478986 P 47 504490248
504478986 B
504482740 504482740 504482740 45 504482740 B 48 504494001
504482740 B
504486494 504497755 504486494 504497755 52 504497755 I 52 "N/A"
504497755 I
504490248 504490248 504490248 47 504490248 B 50 "N/A"
504490248 B
504494001 504494001 504494001 48 504494001 B 51 "N/A"
504494001 B
49 504486494 P 49 "N/A"
504486494 P
50 504490248 B
51 504494001 B
How to reproduce:
@ECHO OFF
ECHO Tip: Use "Save As" to save this list.>"%TEMP%\%~nx1_framecrc.txt"
ECHO.>>"%TEMP%\%~nx1_framecrc.txt"
ffmpeg -i %1 -map 0 -copyts -c copy -an -dn -sn -f framecrc
->>"%TEMP%\%~nx1_framecrc.txt"
"%TEMP%\%~nx1_framecrc.txt"
PAUSE
DEL /Q "%TEMP%\%~nx1_framecrc.txt"
@ECHO OFF
ECHO Tip: Use "Save As" to save this list.>"%TEMP%\%~nx1_showinfo.txt"
ECHO.>>"%TEMP%\%~nx1_showinfo.txt"
ffmpeg -copyts -analyzeduration 240000000 -probesize 1000000000 -i %1 -map 0:v -copyts -vf showinfo
-c:v rawvideo -f null -muxdelay 0 - 2>>"%TEMP%\%~nx1_showinfo.txt"
"%TEMP%\%~nx1_showinfo.txt"
PAUSE
DEL /Q "%TEMP%\%~nx1_showinfo.txt"
@ECHO OFF
ECHO Tip: Use "Save As" to save this list.>"%TEMP%\%~nx1_show_frames.txt"
ECHO.>>"%TEMP%\%~nx1_show_frames.txt"
ECHO %1>>"%TEMP%\%~nx1_show_frames.txt"
ECHO.>>"%TEMP%\%~nx1_show_frames.txt"
ffprobe -sexagesimal -select_streams v -i %1 2>>"%TEMP%\%~nx1_show_frames.txt"
ffprobe -sexagesimal -analyzeduration 240000000 -probesize 1000000000 -select_streams v -show_frames
-of flat -i %1 | FINDSTR /L "key_frame=1 pts= dts= best_effort_timestamp= pict_type=
interlaced_frame= top_field_first= repeat_pict=">>"%TEMP%\%~nx1_show_frames.txt"
"%TEMP%\%~nx1_show_frames.txt"
PAUSE
DEL /Q "%TEMP%\%~nx1_show_frames.txt"
ffmpeg version 2024-05-20-git-127ded5078-full_build-www.gyan.dev
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