Q1: So the MPEG source really is 720x480-24p, correct?
Q2: I think I know that "90k tbn" relates to frame time accuracy,
but what does "59.94 tbr" mean?
Q3: What does "59.94 tbc" mean?
...Yeah, I know that Carl Eugen has answered that previously:
"Different time bases, tbn is the container, tbc is codec iirc", but I
just can't get my head around "time base". If the video is 29.97 fps, I
just can't figure out what else there is.
I repackaged the video as MKV via 'mkvtoolnix-gui.exe' -- I'm trying to
figure out what mkvtoolnix is doing.
C:\CMD & tiny apps\ffmpeg>CMD /K ffprobe -i "M:\Movies1\xxxxxxx.mkv"
-select_streams v:0 -show_frames -of flat -sexagesimal ...followed by
a very long pipe
...same banner as above of course...
Input #0, matroska,webm, from 'M:\Movies1\xxxxxxx.mkv':
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, top first),
720x480 [SAR 32:27 DAR 16:9], Closed Captions, SAR 186:157 DAR 279:157,
59.94 fps, 59.94 tbr, 1k tbn, 59.94 tbc (default)
[mpeg2video @ 000002837731a8c0] ignoring pic cod ext after 0
frames.frame.1800.interlaced_frame=1 ...pipe output
frames.frame.1800.top_field_first=1 ...pipe output
frames.frame.1800.repeat_pict=0 ...pipe output
frames.frame.1801.interlaced_frame=1 ...pipe output
frames.frame.1801.top_field_first=1 ...pipe output
frames.frame.1801.repeat_pict=0 ...pipe output
frames.frame.1802.interlaced_frame=1 ...pipe output
frames.frame.1802.top_field_first=1 ...pipe output
frames.frame.1802.repeat_pict=0 ...pipe output
frames.frame.1803.interlaced_frame=1 ...pipe output
frames.frame.1803.top_field_first=1 ...pipe output
frames.frame.1803.repeat_pict=0 ...pipe output
The MKV appears to be 720x480-60i (maybe -- as I don't know what "tbr" &
"tbc" really mean).
Q4: Is it actually 720x480-60i?
Q5: I know what SAR & DAR are, but what does extra "SAR 186:157
DAR 279:157" connote?
mkvtoolnix isn't supposed to change the video, just repackage it. But
due to the speed at which mkvtoolnix repackages, it can't possibly be
transcoding, yet the video seems changed. I have to be misinterpreting
something. Help. (Note: I've examined the source video via 'VobEdit.exe'
but I have no equivalent tool for MKVs.) ...All this is driving me to
BTW, I've tried asking at #ffmpeg-user but there's just too many moving
parts to formulate terse questions. I sure wish someone knowledgeable
would create an ffmpeg-glossary & a guide to command list outputs.
ffmpeg seems to be using terminology that differs from MPEG standards.
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