Investigation of unresolved concatenation and subtitle problems.
Two scripts, one running '-vf showinfo', the other, '-show_streams'.
echo 1.1 00305 M2TS SHOWINFO - h:\BDMV\STREAM\00305.m2ts
set SOURCE=h:\BDMV\STREAM\00305.m2ts
set PREP=-report -analyzeduration 5772725000 -probesize 15091101696
set ARGS=-map 0 -vf showinfo -c:v rawvideo -sn -an -f null c:\void.mkv
set TARGET=e:\00305.m2ts_showinfo.txt
ffmpeg %PREP% -i %SOURCE% %ARGS% 2>%TARGET%
echo 1.2 00305 M2TS SHOW STREAMS - h:\BDMV\STREAM\00305.m2ts
set SOURCE=h:\BDMV\STREAM\00305.m2ts
set PREP=-analyzeduration 5772725000 -probesize 15091101696
set ARGS=-show_streams
set TARGET=e:\00305.m2ts_streams.txt
ffprobe %PREP% -i %SOURCE% %ARGS% >%TARGET%
Both of them provoke
"Failed to allocate buffers for seekback" message, and
165 "DTS discontinuity in stream 2" (the subs) messages.
packet 12 with DTS 12859568, packet 13 with DTS 12970433
packet 20 with DTS 13302507, packet 21 with DTS 13417133
packet 28 with DTS 14965402, packet 29 with DTS 15080059
:
packet 6026 with DTS 495381711, packet 6027 with DTS 495687565
COMPARING WHAT MPV SHOWS VERSUS 'showinfo' VERSUS 'show_streams'
MPV first = 0
MPV total = 1:36:12.725291[6..] = 5772.725291[6..] seconds
MPV final = 5772.725291[6..]-1.001/24 = 5772.68358[3..] seconds
MPV 0..519541522.4[9..] ticks --> 0..138405.[9..] frames
: :
showinfo [note1] 0..519541522 0..138406
show_streams 1048560 = video start_pts
1048560 = audio start_pts
7685190 = subs start_pts [note2] (PREP shown above)
1048560 = subs start_pts [note3] (no PREP)
[note1] First & final '-vf showinfo' listings:
[Parsed_showinfo_0 @ 00000000d91a1f00] n: 0 pts: 0 -snip-
[Parsed_showinfo_0 @ 00000000d91a1f00] n:138406 pts:519541522 -snip-
[note2] 7685190 ticks 'says' 1st subtitle is at 1:13.740 - confirmed.
[note3] 1048560 ticks 'says' 1st subtitle is at 0:00.000 - incorrect.
Q1: Why do 'ffmpeg -vf showinfo' and 'ffprobe -show_streams' differ?
Q2: Is '-analyzeduration 5772725000 -probesize 15091101696' catching all?
Q3: What is the effect of 'no PREP' on concatination?
If you have questions, kindly ask.
I have the results saved, and I can explain the "COMPARING" section.
Thank you -- Mark.
(stopping now to get some sleep).
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