CODEWITHSUNDEEP
ffmpeg
Apoorva
Apoorva

Reputation: 23

how to get the timestamp of the image extracted using ffmpeg

How to get the time stamp of the extracted image obtained by using ffmpeg? What option is to be passed to the ffmpeg command?
The current command that i am using is:

ffmpeg -i video.mp4 -vf select='gt(scene\,0.3)' -vsync 0 -an keyframes%03d.jpg

Upvotes: 2

Views: 5555

Answers (4)

SAJJAN K
SAJJAN K

Reputation: 106

A small update to @DeWil's answer (sorry could not comment as I do not have enough reputations). The below answer gives the appropriate timestamp by matching with the regular expresion for timestamp "t:" not "pts:".

from subprocess import check_output
import re
pts = str(check_output('ffmpeg -i input.mp4 -vf select="eq(pict_type\,I)" -an -vsync 0  keyframes%03d.jpg -loglevel debug 2>&1 |findstr select:1  ',shell=True),'utf-8')  #replace findstr with grep on Linux
pts = [float(i) for i in re.findall(r"\bt:(\d+\.\d)", pts)] # Find pattern that starts with "t:"
print(pts)

Upvotes: 0

DeWil
DeWil

Reputation: 362

As this question is tagged in python, I would like to add the following solution for Python developers:

from subprocess import check_output
import re
pts = str(check_output('ffmpeg -i video.mp4 -vf select="eq(pict_type\,I)" -an -vsync 0  keyframes%03d.jpg -loglevel debug 2>&1 |findstr select:1  ',shell=True),'utf-8')  #replace findstr with grep on Linux
pts = [float(i) for i in re.findall(r"\bpts:(\d+\.\d)", pts)] # Find pattern that starts with "pts:"
print(pts)

Upvotes: 1

Suresh Saini
Suresh Saini

Reputation: 61

Extracting frame while scene change and get time for particular frame . May following line might helps:

ffmpeg -i image.mp4 -filter:v "select='gt(scene,0.1)',showinfo" -vsync 0 frames%05d.jpg >& output.txt

You will get output like: [Parsed_showinfo_1 @ 0x25bf900] n: 0 pts: 119357 pts_time:9.95637 pos: 676702..... You need to extract pts_time for that run following command.

grep showinfo ffout | grep pts_time:[0-9.]* -o | grep '[0-9]*\.[0-9]*' -o > timestamps

Using above command you will find following:

9.95637
9.98974
15.0281
21.8016
28.208
28.4082

Upvotes: 2

trix
trix

Reputation: 898

An option could be to write timestamps directly over each frame, using drawtext video filter.

On a Windows machine, using Zeranoe ffmpeg package you can type:

ffmpeg -i video.mp4 -vf "drawtext=fontfile=/Windows/Fonts/Arial.ttf: timecode='00\:00\:00\:00': r=25: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1: boxcolor=0x00000000@1: fontsize=30" tmp/frame%05d.jpg" -vsync 0 -an keyframes%03d.jpg

The command will dump frame timestamps in the lower part of each frame, with seconds resolution.

Please have a look here to get informations how to setup fonts enviroment variables for ffmpeg.

Upvotes: 1

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