Placeholder pass is a coding pass having zero length. It is necessary to keep pass boundaries of layers for the transcoding from HT to non HT codestream. It is defined in the spec of HTJ2K.
A detaled explanation is available at https://ds.jpeg.org/documents/jpeg2000/wg1n100680-101-COM-Guideline_on_Placeholder_Passes_and_Multiple_HT_Sets_in_HTJ2K_codestreams.zip > 2024/06/24 18:34、Andreas Rheinhardt <andreas.rheinha...@outlook.com>のメール: > > ?Osamu Watanabe: >> This commit adds support for placeholder pass parsing >> > > What is a placeholder pass? > >> Signed-off-by: Osamu Watanabe <owata...@es.takushoku-u.ac.jp> >> --- >> libavcodec/jpeg2000.h | 2 + >> libavcodec/jpeg2000dec.c | 292 +++++++++++++++++++++++++++++++------ >> libavcodec/jpeg2000htdec.c | 18 +-- >> 3 files changed, 257 insertions(+), 55 deletions(-) >> > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
