[FFmpeg-trac] #3743(avcodec:open): mpeg2video decoder loses frames when progressive_sequence flag flips
FFmpeg
trac at avcodec.org
Fri Jun 27 23:59:37 CEST 2014
#3743: mpeg2video decoder loses frames when progressive_sequence flag flips
-------------------------------------+-------------------------------------
Reporter: SianLiao | Owner:
Type: enhancement | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: mpeg2video | Blocked By:
regression | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Changes (by michael):
* priority: important => normal
* type: defect => enhancement
Comment:
the progressive sequence flag isnt allowed to change in mpeg, thus this is
a bug in the used encoder.
Where is this file from ?
{{{
mpeg2:
In repeat sequence headers all of the data elements with the
permitted
exception of those defining the quantisation
matrices
(load_intra_quantiser_matrix, load_non_intra_quantiser_matrix
and
optionally intra_quantiser_matrix and non_intra_quantiser_matrix)
shall
have the same values as in the first sequence header. The
quantisation
matrices may be redefined each time that a sequence header occurs in
the
bitstream (Note that quantisation matrices may also be updated
using
quant_matrix_extension()).
All of the data elements in the sequence_extension() that follows a
repeat
sequence_header() shall have the same values as in the
first
sequence_extension().
If a sequence_scalable_extension() occurs after the first
sequence_header()
all subsequent sequence headers shall be followed
by
sequence_scalable_extension() in which all data elements are the same as
in
the first sequence_scalable_extension().
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3743#comment:4>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
More information about the FFmpeg-trac
mailing list