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-----Original Message-----
From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of Dan
Bridges
Sent: Thursday, March 15, 2018 12:43 AM
To: ffmpeg-user at ffmpeg.org
Subject: Re: [FFmpeg-user] mpeg2video encode gop structure

On 14/03/2018 1:37 PM, ??? wrote:
> ffmpeg.exe -i L:\input.mp4 -vcodec mpeg2video -g 12 -bf 2 -flags +cgop 
> -sc_threshold 1000000000 -y L:\output.m2v

I tried this.  I used the following ffprobe line:

ffprobe -v quiet  -select_streams v  -of csv -show_frames -show_entries
frame=pict_type,coded_picture_number  -read_intervals %+#24 output.m2v >
test.txt

1. Here is the order of frames before sorting. I presume this is how they're
stored in the stream.

I    B    B    P    B    B    P    B    B    P    I    B    B    P B    B   
P    B    B    P    I    B    B    P


2. Here  is the order of frames after sorting on coded_picture_number. I
presume this is the order the frames need to be decoded in:

I    P    B    B    P    B    B    P    B    B    I    P    B    B P    B   
B    P    B    B    I    P    B    B


When discussing GOP structure, which order is used?


Dan.

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