[FFmpeg-user] snapshot from videfile: incorrect position

scenator info at scenator.de
Thu Apr 3 23:26:00 CEST 2014


I hope, it is quite simple for you...

I want to take a snapshot from sec. 437,960212.

Therefore, I have to go fastforward to 435.96 (2Sec. before snapshot),
then play 2.00 Seconds and take my snapshot

So I call:
C:\ProgramData\ffmpeg.exe -ss 435.96 -i "d:\Temp\STOP!1~1.M2T" -y -s
1920x1080 -ss 00:00:02.00 -vframes 1

result: the extracted frame ist a frame round about half a second before

So I tried some combinations like:
 -ss 435.96 -i "d:\Temp\STOP!1~1.M2T" -y -s 1920x1080 -ss 00:00:01.75... ->
got closer to 437,96..
 -ss 435.96 -i "d:\Temp\STOP!1~1.M2T" -y -s 1920x1080 -ss 00:00:01.70... ->
exactely the wished frame 437,96.

But another target-position eg. 525,16:
-ss 00:00:01.80 is exactely the wished frame, etc.

So could you please explain, how to find out the exact target frame?

Best regards in advantage,

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