如何从PHP / FFmpeg / MP4Box / Anything中提取MP4搜索点信息？

Question

Is it possible to extract the seekpoints/keyframes from a MP4 file in the following fashion:

Keyframe - Time Range (in seconds) - Offset (in bytes)

Example: 0 - 0s - 77262

1 - 0.5s - 144183

2 - 1s - 222965

3 - 1.5s - 293303

4 - 2s - 362199

5 - 2.5s - 431178

Thanks in advance.

Answer 1

You can use ffprobe . Perhaps something like this:

ffprobe -show_frames -select_streams v:0 -show_entries frame=key_frame,coded_picture_number,pkt_pts_time,pkt_pos input.mp4 | grep -A 3 "key_frame=1"

Results in:

key_frame=1
pkt_pts_time=0.000000
pkt_pos=48
coded_picture_number=0
--
key_frame=1
pkt_pts_time=10.000000
pkt_pos=47130
coded_picture_number=250
--
key_frame=1
pkt_pts_time=20.000000
pkt_pos=92713
coded_picture_number=500
--
key_frame=1
pkt_pts_time=30.000000
pkt_pos=138159
coded_picture_number=750

• key_frame=1 indicates that the particular frame is a key frame.

• You may have to choose section_entries if this example does not give you exactly what you want. See man ffprobe .

• See the -print_format option to change the output printing format (default, compact, csv, flat, ini, json, xml). You may have to perform additional processing to get what you want.