[FFmpeg-trac] #9523(avfilter:new): segment_times splits at I-frames that are not keyframes

[FFmpeg]

#9523: segment_times splits at I-frames that are not keyframes
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             Reporter:  TurboLed    |                    Owner:  (none)
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Description changed by TurboLed:

Old description:

> Summary of the bug:
>
> When splitting segments on an MP4 video that contains I-frames that are
> not keyframes (not IDR frames), the splitting can occur on those I-frames
> and make the next segment unreadable.
>
> How to reproduce:
> {{{
> % ffmpeg -i sample.mp4 -f segment -segment_times 3 -c copy output%03d.mp4
> % ffprobe -i output001.mp4 -show_frames
>
> [FRAME]
> media_type=video
> stream_index=0
> key_frame=0
> pts=150144
> pts_time=3.128000
> pkt_dts=151145
> pkt_dts_time=3.148854
> best_effort_timestamp=150144
> best_effort_timestamp_time=3.128000
> pkt_duration=1001
> pkt_duration_time=0.020854
> pkt_pos=48
> pkt_size=599189
> width=2720
> height=1530
> pix_fmt=yuv420p
> sample_aspect_ratio=1:1
> pict_type=I
> coded_picture_number=1
> display_picture_number=0
> interlaced_frame=0
> top_field_first=0
> repeat_pict=0
> color_range=tv
> color_space=bt709
> color_primaries=bt709
> color_transfer=bt709
> chroma_location=left
> [/FRAME]
>
> ffmpeg version 2021-11-18-git-85a6b7f7b7-essentials_build-www.gyan.dev
> }}}

New description:

 Summary of the bug:

 When splitting segments on an MP4 video that contains I-frames that are
 not keyframes (not IDR frames), the splitting can occur on those I-frames
 and make the next segment unreadable.

 How to reproduce:
 {{{
 % ffmpeg -i sample.mp4 -f segment -segment_times 3 -c copy output%03d.mp4
 % ffprobe -i output001.mp4 -show_frames

 [FRAME]
 media_type=video
 stream_index=0
 key_frame=0
 pts=150144
 pts_time=3.128000
 pkt_dts=151145
 pkt_dts_time=3.148854
 best_effort_timestamp=150144
 best_effort_timestamp_time=3.128000
 pkt_duration=1001
 pkt_duration_time=0.020854
 pkt_pos=48
 pkt_size=599189
 width=2720
 height=1530
 pix_fmt=yuv420p
 sample_aspect_ratio=1:1
 pict_type=I
 coded_picture_number=1
 display_picture_number=0
 interlaced_frame=0
 top_field_first=0
 repeat_pict=0
 color_range=tv
 color_space=bt709
 color_primaries=bt709
 color_transfer=bt709
 chroma_location=left
 [/FRAME]

 ffmpeg version 2021-11-18-git-85a6b7f7b7-essentials_build-www.gyan.dev
 }}}

 I'm looking for a way to upload the sample, but the FTP site is not
 working.

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Ticket URL: <https://trac.ffmpeg.org/ticket/9523#comment:2>
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