On 12/28/23 07:47, Nicolas Gaullier wrote:
When ffmpeg's '-vf showinfo' and ffprobe's '-show_streams' disagree, which
should I trust?
You should usually trust both, but their meanings are different.
You should trust neither.
I have more info that includes corrections to what I previously wrote -- gad, this is confusing and
error prone work.
COMPUTE (exact)
MPV <------1:18:19.236208[3..]-----> end to end
0..4699.1945 seconds, first..last
0..112668 frames, computed from seconds
:
SHOWINFO 0..112668 frames
0..422927505 ticks <-----------+
FRAMECRC 1044806..423972311 ticks vid ¦
:\________\__ 422927505 <------+
1048560..423979440 ticks aud
:\________\__ 422930880
STREAMS 1048560..? vid start_pts <- not in showinfo, not vid PTS
1048560..? aud start_pts
\ 3143152..? sub start_pts
\_\__ 1st sub at 0:23.273 - confirmed.
if -framecrc is right, then
-showinfo "n: 0 pts: 0" <- wrong -- no equivocation, wrong
-show_streams vid "start_pts=1048560" <- wrong -- no equivocation, wrong
I previously wrote, "So '-framecrc' & '-showinfo' agree but they disagree with '-show_streams'."
That was erroneous. They all disagree with each other. Apparently, ffmpeg/ffprobe should be fixed so
that my chart would then be:
MPV <------1:18:19.236208[3..]-----> end to end
0..4699.1945 seconds, first..last
0..112668 frames, computed from seconds
:
SHOWINFO 0..112668 frames
1044806..423972311 ticks <== when fixed
FRAMECRC 1044806..423972311 ticks vid
:\________\__ 422927505
1048560..423979440 ticks aud
:\________\__ 422930880
STREAMS 1044806..? vid start_pts <== when fixed
1048560..? aud start_pts
\ 3143152..? sub start_pts
\_\__ 1st sub at 0:23.273 - confirmed.
But is '-framecrc' actually correct?
I will use the '-framecrc' numbers to do the DTS-PTS shifting and packet concatenations and will
report back.
-- Mark.
_______________________________________________
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
