When using ffmpeg to output a series of frames as images, the only format I can find documentation for is frame_%d.jpg. The %d identifier is replaced by the sequential frame count.
Are there other parameters I can use in the output file format? Specifically, I need the ability to add the timestamp of the specific frame.
Turns out this behavior was not yet implemented at the time.
I implemented an initial version of %t support on my fork of FFmpeg (https://github.com/yuvadm/FFmpeg), and am currently working on cleaning up the patch so that it can be merged upstream.
The strftime option allows you to expand the filename with date and time information. Check the documentation of the strftime() function for the syntax.
For example to generate image files from the strftime() %Y-%m-%d_%H-%M-%S pattern, the following ffmpeg command can be used:
ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1 "%Y-%m-%d_%H-%M-%S.jpg"
sudo add-apt-repository ppa:mc3man/trusty-media sudo apt-get update sudo apt-get dist-upgrade sudo apt-get install ffmpegI hacked up a bash script that creates file names based on time into the film. It uses a format: "hh_mm_ss" in the file name. You can see it at:
Another option you'd have would be to run ffprobe -show_packets on it, and use that data to "infer" the timestamp of each generated jpg file (assuming you generate one per incoming video frame). Yikes!
For number of frames can use report with special debug mode:
FFREPORT=file=\'file.log\':level=48 && ffmpeg ... -vf select=eq(pict_type\,PICT_TYPE_I) -vsync vfr -f image2 OUTPUT
then you can match the name with preg_match_all:
preg_match_all("/] n:(\\d+)\\.[^>]+pict_type:I/Us",$log,$m,PREG_PATTERN_ORDER,5000);
$frames=$m[1];
Please enjoy!
You can try %s with -strftime if you want to attach epoch.
Example :
ffmpeg -rtsp_transport tcp -i 'input.mp4' -vf fps=1 -strftime 1 "%s_frame.png"
