How can I check keyframe interval of a video file?
all I can see in ffmpeg output is:
Metadata:
metadatacreator : Yet Another Metadata Injector for FLV - Version 1.8
hasKeyframes : true
hasVideo : true
hasAudio : true
hasMetadata : true
canSeekToEnd : true
datasize : 256600272
videosize : 210054362
audiosize : 45214634
lasttimestamp : 5347
lastkeyframetimestamp: 5347
lastkeyframelocation: 256649267
Duration: 01:29:07.24, start: 0.040000, bitrate: 383 kb/s
Stream #0:0: Video: h264 (High), yuv420p, 720x304 [SAR 1:1 DAR 45:19], 312 kb/s, 25 tbr, 1k tbn, 50 tbc
Stream #0:1: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
You can display the timestamp for each frame with ffprobe
with awk
to only output key frame info. Works in Linux and macOS.
ffprobe -loglevel error -select_streams v:0 -show_entries packet=pts_time,flags -of csv=print_section=0 input.mp4 | awk -F',' '/K/ {print $1}'
Or a slower method that works on any OS and does not require awk
or similar additional processing tools:
ffprobe -loglevel error -skip_frame nokey -select_streams v:0 -show_entries frame=pkt_pts_time -of csv=print_section=0 input.mp4
Results:
0.000000
2.502000
3.795000
6.131000
10.344000
12.554000
16.266000
17.559000
...
See the ffprobe
documentation for more info.