#3083: Suspicion that valid random access point is not marked as keyframe in
AVCHD
samples from Panasonic Lumix GH1
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Reporter: rmk | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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AVCHD files from a camera (Panasonic Lumix GH1) demux and
decode with libavformat/libavcodec detecting no other keyframe but the
first (both, the first video packet and video frame are marked as
keyframe), which is not what I would have expected for those clips as
the GOP structure of files produced by this camera is known to be
different.
I observed the following things when looking at the 720p sample:
- there are no recovery point SEIs or IDRs after the first frame
- before every I-frame/slice there is an SPS
- seeking in these files works fine in FCPX import dialog, so I guess they
do not decode the entire file on every seek (they do however maybe use
auxiliary AVCHD files to find these random access points)
- the stream decodes fine if one takes just the packets starting from a
packet that contains an I-slice
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3083>
FFmpeg <http://ffmpeg.org>
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