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ffmpeg -c copy sometimes skips the first specified keyframe #6

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Kagami opened this issue Sep 9, 2016 · 2 comments
Open

ffmpeg -c copy sometimes skips the first specified keyframe #6

Kagami opened this issue Sep 9, 2016 · 2 comments

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@Kagami
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Kagami commented Sep 9, 2016

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@Kagami
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Kagami commented Oct 30, 2016

Seems to be FFmpeg's issue.
Both mkvinfo and ffprobe signals keyframe at specific timestamp but ffmpeg -c copy skips copying until next keyframe.

@Kagami Kagami closed this as completed Oct 30, 2016
@Kagami Kagami changed the title Fix wrong keyframe detection for some VP8 videos ffmpeg -c copy sometimes skips the first specified keyframe Oct 27, 2017
@Kagami
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Kagami commented Oct 27, 2017 •
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Reopening because this happens not that rare and would be good to fix or at least report it.

Another example: https://youtu.be/9fbrjY1S73E
Save 1080p VP9, both mkvinfo and ffprobe indicate keyframe at 02:13.759, but first frame of -c copy is only at 02:13.801.

@Kagami Kagami reopened this Oct 27, 2017
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