From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH 02/41] avcodec/mjpegenc: Remove nonsense assert
Date: Sun, 30 Jan 2022 18:07:21 +0100
Message-ID: <AM7PR03MB6660C1DA500CB4C54F2D11AD8F249@AM7PR03MB6660.eurprd03.prod.outlook.com> (raw)
In-Reply-To: <20220130131539.GF2829255@pb2>
Michael Niedermayer:
> 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
>
The intention of the quoted passage was to state a limitation of our
current code, not a limitation of the format.
- Andreas
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next prev parent reply other threads:[~2022-01-30 17:07 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
2022-01-30 17:07 ` Andreas Rheinhardt [this message]
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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