Using FFmpeg to count number of frames

Use FFmpeg to count number of frames, fastly and reliably (recommended, works on any video file)

Stackoverflow: https://stackoverflow.com/a/66105349

ffmpeg -i input.mp4 -map 0:v:0 -c copy -f null -

The FFmpeg command loops through the video file but do not decode any frames. It only increments the counter, thus it's very fast.

Use FFprobe, output frame count only

Stackoverflow: https://stackoverflow.com/a/28376817

ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=nb_read_packets -of csv=p=0 input.mp4

What the ffprobe options mean:

• -v error This hides "info" output (version info, etc) which makes parsing easier (but makes it harder if you ask for help since it hides important info).
• -count_frames Count the number of packets per stream and report it in the corresponding stream section.
• -select_streams v:0 Select only the first video stream.
• -show_entries stream=nb_read_packets Show only the entry for nb_read_frames.
• -of csv=p=0 sets the output formatting. In this case it hides the descriptions and only shows the value. See FFprobe Writers for info on other formats including JSON.

Use FFprobe to get frame count from video file metadata

Stackoverflow: https://stackoverflow.com/q/66098161

ffprobe -select_streams v:0 -show_entries stream=nb_frames -of default=noprint_wrappers=1 input.mp4