From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 02/41] avcodec/mjpegenc: Remove nonsense assert
Date: Sun, 30 Jan 2022 14:15:39 +0100
Message-ID: <20220130131539.GF2829255@pb2> (raw)
In-Reply-To: <AM7PR03MB6660D83AC49DD05CB5CFF5F58F249@AM7PR03MB6660.eurprd03.prod.outlook.com>
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On Sun, Jan 30, 2022 at 07:27:10AM +0100, Andreas Rheinhardt wrote:
> Writing optimal huffman tables is incompatible with using slices
Fundamentally, this should not be i think
CCITT Rec. T.81 says
"If a table specification for a
given destination occurs more than once in the compressed image data, each specification shall replace the previous
specification. The quantization table specification shall not be altered between progressive DCT scans of a given
component."
This explicitly mentions quatization tables but not huffman tables so it
seems allowed that they can be changed
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
If you drop bombs on a foreign country and kill a hundred thousand
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"unprovoked inhuman terrorist attacks" and use it to justify dropping
more bombs and killing more people. The technology changed, the idea is old.
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next prev parent reply other threads:[~2022-01-30 13:15 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-30 6:08 [FFmpeg-devel] [PATCH 01/41] avcodec/mpegvideo_enc: Allow slices only for slice-thread-able codecs Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 02/41] avcodec/mjpegenc: Remove nonsense assert Andreas Rheinhardt
2022-01-30 13:15 ` Michael Niedermayer [this message]
2022-01-30 17:07 ` Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 03/41] avcodec/mjpegenc: Fix files with slices > 1, but threads == 1 Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 04/41] avcodec/mpegvideo: Enable private contexts Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 05/41] avcodec/h261: Separate decode and encode contexts Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 06/41] avcodec/h261enc: Pass PutBitContext directly in h261_encode_motion() Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 07/41] avcodec/idctdsp: Constify the permutation parameter of ff_init_scantable Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 08/41] avcodec/wmv2: Move initializing abt_scantables to the decoder Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 09/41] avcodec/wmv2: Split Wmv2Context into decoder and encoder context Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 10/41] avcodec/msmpeg4.h: Move encoder-only stuff to a new header Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 11/41] avcodec/msmpegenc: Add MSMPEG4EncContext and move ac_stats to it Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 12/41] avcodec/h263.h: Move encoder-only stuff to a new header h263enc.h Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 13/41] avcodec/mpegvideo: Move encoder-only stuff to a new header Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 14/41] avcodec/avcodec: Avoid MpegEncContext in AVHWAccel.decode_mb Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 15/41] avcodec/speedhqenc: Add SpeedHQEncContext and move slice_start to it Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 16/41] avcodec/mpegvideo: Use typedefs for MPV(Main)?(Dec|Enc)?Context Andreas Rheinhardt
2022-01-30 11:40 ` Michael Niedermayer
2022-01-30 23:05 ` Andreas Rheinhardt
2022-01-31 15:37 ` Michael Niedermayer
2022-01-30 11:43 ` Michael Niedermayer
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 17/41] avcodec/mpegvideo_enc: Don't find encoder by ID Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 18/41] avcodec/mpegvideoenc: Add proper MPVMainEncContext Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 19/41] avcodec/mpegvideoenc: Move tmp bframes to MPVMainEncContext Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 20/41] avcodec/mpegvideoenc: Move ratecontrol " Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 21/41] avcodec/mpegvideo: Move me_pre and me_penalty_compensation to enc-ctx Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 22/41] avcodec/mpegvideo: Move gop_size to MPVMainEncContext Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 23/41] avcodec/mpegvideo_enc: Don't set picture_in_gop_number for slice threads Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 24/41] avcodec/mpegvideo: Move picture_in_gop_number to MPVMainEncContext Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 25/41] avcodec/mpegvideo: Move pts and dts fields " Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 26/41] avcodec/mpegvideo: Move input_picture list " Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 27/41] avcodec/mpegvideo: Remove write-only [fb]_code Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 28/41] avcodec/mpegvideo: Move last-pic information to MPVMainEncContext Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 29/41] avcodec/mpegvideo: Move header_bits " Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 30/41] avcodec/mpegvideo_enc: Remove unused function parameters Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 31/41] avcodec/mpegvideo_enc: Remove unused parameter from encode_mb_hq() Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 32/41] avcodec/mpegvideo: Move vbv_delay to Mpeg1Context Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 33/41] avcodec/mpegvideo: Move brd_scale to MPVMainEncContext Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 34/41] avcodec/mpegvideo: Move ratecontrol parameters " Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 35/41] avcodec/mpegvideo: Allocate encoder-only tables in mpegvideo_enc.c Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 36/41] avcodec/mpegvideo: Move encoder-only base-arrays to MPVMainEncContext Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 37/41] avcodec/mpegvideo_enc: Initialize non-JPEG q-matrices only once Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 38/41] avcodec/mpegvideo_enc: Avoid allocations for q_int(er|ra)_matrix tables Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 39/41] avcodec/mpegvideo: Move scenechange_threshold to MPVMainEncContext Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 40/41] avcodec/mpegvideo: Move dummy dst for depr. opts " Andreas Rheinhardt
2022-01-30 6:27 ` [FFmpeg-devel] [PATCH 41/41] avcodec/mpegvideo: Move frame_skip_(exp|cmp) " Andreas Rheinhardt
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