[FFmpeg-trac] #1256(FFmpeg:new): FLV encoding, GOP parameter

[FFmpeg]

#1256: FLV encoding, GOP parameter
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             Reporter:  nealt   |                     Type:  defect
               Status:  new     |                 Priority:  important
            Component:  FFmpeg  |                  Version:  git-master
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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 ffmpeg version N-40126-ga4b58fd

 next command arguments produces flash video without specified gop (10
 frames):
 ffmpeg.exe -i tower.avi -vcodec libx264 -g 10 -s 800x600 -acodec
 libmp3lame -ab 128k -y output.flv

 mediainfo:
 Video
 ID                                       : 1
 Format                                   : AVC
 Format/Info                              : Advanced Video Codec
 Format profile                           : High at L3.1
 Format settings, CABAC                   : Yes
 Format settings, ReFrames                : 4 frames
 Format settings, GOP                     : M=4, N=10
 Codec ID                                 : avc1
 Codec ID/Info                            : Advanced Video Coding

 but next arguments works properly (gop = 10):
 ffmpeg.exe -i input.avi -vcodec libx264 -g 10 -s 800x600 -acodec
 libmp3lame -ab 128k -y output.mp4

 mediainfo:
 Video
 Format                                   : AVC
 Format/Info                              : Advanced Video Codec
 Format profile                           : High at L3.1
 Format settings, CABAC                   : Yes
 Format settings, ReFrames                : 4 frames
 Codec ID                                 : 7

 If you make remultiplexing of output.mp4 to flv it keeps GOP value.
 Why same settings for the video codec makes so different output files?

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1256>
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