[FFmpeg-trac] #8353(avcodec:new): videotoolboxenc: h264_videotoolbox is not writing b-frames

[FFmpeg]

#8353: videotoolboxenc: h264_videotoolbox is not writing b-frames
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             Reporter:  Nomis101  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avcodec   |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 hevc_videotoolbox does write b-frames, but h264_videotoolbox does not.

 Steps:
 1. Encode a video with h264_videotoolbox
 $ ffmpeg -i input.foo -acodec copy -vcodec h264_videotoolbox -b:v 20000k
 -profile:v main /ffmpeg_output.mp4

 2. check the video for b-frames
 $ ffprobe -show_frames ffmpeg_output.mp4 > outputfile.txt

 In outputfile.txt there is pict_type=P and pict_type=I only, there is no
 pict_type=B

 Full output is attached.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8353>
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