How can I retrieve information from video about byte number from which every frame starts, with using ffmpeg or something else?
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You can try ffprobe:
$ ffprobe -show_frames input.mkv
...
[FRAME]
media_type=video
key_frame=0
pkt_pts=3240
pkt_pts_time=3.240000
pkt_dts=N/A
pkt_dts_time=N/A
best_effort_timestamp=3240
best_effort_timestamp_time=3.240000
pkt_duration=40
pkt_duration_time=0.040000
pkt_pos=18009
pkt_size=480
width=320
height=240
pix_fmt=yuv444p
sample_aspect_ratio=1:1
pict_type=P
coded_picture_number=76
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
[/FRAME]
pkt_posmay be what you're looking for.- If you only want info from the video stream add
-select_streams v:0. - See FFprobe Documentation and FFmpeg Wiki: FFprobe Tips for more examples.
llogan
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`-select_streams v:0` will filter to the first video stream in the stream. To filter so all video streams (if there are more than 1) are returned use `-select_streams v` – Trisped Oct 01 '20 at 22:15