[FFmpeg-user] How to get he total number of frames

Mark Filipak (ffmpeg) markfilipak at bog.us
Tue Mar 9 21:43:21 EET 2021

On 2021-03-09 03:58, Michael Koch wrote:
> Am 09.03.2021 um 09:46 schrieb Ulf Zibis:
>> Am 09.03.21 um 09:26 schrieb Peter White:
>>> On Tue, Mar 09, 2021 at 09:13:14AM +0100, Ulf Zibis wrote:
>>>> Hi,,
>>>> can one please tell me, how I can get the total number of frames of a video?
>>> ffmpeg -i input -an -sn -c copy -f null -
>>> This basically copies all frames into the void but you get the total
>>> count this way in the stats line.
>> Much thanks. This at least gives a ballpark figure. Is there a way to get the exact frame count?
> These links might help:
> https://stackoverflow.com/questions/2017843/fetch-frame-count-with-ffmpeg
> https://superuser.com/questions/1512575/why-total-frame-count-is-different-in-ffmpeg-than-ffprobe
> Michael

Those links are really hard to follow and it's fruitless to try to find what's there that works vs. 
what doesn't work.

 From Ulf Zibis:
can one please tell me, how I can get the total number of frames of a video?

Was Ulf's question actually answered? I think not.

I'd like to know the answer.

Here's a cmd script that I have implemented in the Windows 'SentTo' context menu:

ECHO Tip: Use "Save As" to save this list.>"%TEMP%\%~nx1 timestamps.txt"
ECHO.>>"%TEMP%\%~nx1 timestamps.txt"
ffprobe -hide_banner -sexagesimal -select_streams v -i %1 2>>"%TEMP%\%~nx1 timestamps.txt"
ffprobe -hide_banner -sexagesimal -select_streams v -show_frames -of flat -i %1 | FINDSTR /L 
"key_frame=1 best_effort_timestamp">>"%TEMP%\%~nx1 timestamps.txt"
"%TEMP%\%~nx1 timestamps.txt"
DEL /Q "%TEMP%\%~nx1 timestamps.txt"

'~nx' strips enclosing quotes (if present) and extracts the file's name & extension (example: 
'%~nx1 timestamps.txt' saves the video.mkv list as 'video.mkv timestamps.txt'.
"%TEMP%\%~nx1 timestamps.txt" opens the list in my editor.

The last line of the list produced by the cmd script shows the frame number of the ending frame -- 
Add 1 to get the number of frames.

The list also shows this metadata:
"NUMBER_OF_FRAMES-eng: 95286",
but that number is bogus; the mkv actually has only 3596 frames.

Yes, the ffprobe command is slow. That's why I'd like to know a quick check of number of frames if 
indeed such a method exists.

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