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    Ecrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
    Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
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Sur d’autres sites (4664)

  • dnxhddec : decode and use interlace mb flag

    25 septembre 2015, par Christophe Gisquet
    dnxhddec : decode and use interlace mb flag
    

    This bit is 1 in some samples, and seems to coincide with interlaced
    mbs and CID1260. 2008 specs do not know about it, and maintain qscale
    is 11 bits. This looks oversized, but may help larger bitdepths.

    Currently, it leads to an obviously incorrect qscale value, meaning
    its syntax is shifted by 1. However, reading 11 bits also leads to
    obviously incorrect decoding : qscale seems to be 10 bits.

    However, as most profiles still have 11bits qscale, the feature is
    restricted to the CID1260 profile.

    The encoder writes 12 bits of syntax, last and first bits always 0,
    which is now somewhat inconsistent with the decoder, but ends up with
    the same effect (progressive + reserved bit).

    Partially fixes ticket #4876.

    Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>

    • [DH] libavcodec/dnxhddec.c
  • dnxhddec : Decode and use interlace mb flag

    26 septembre 2015, par Christophe Gisquet
    dnxhddec : Decode and use interlace mb flag
    

    This bit is 1 in some samples, and seems to coincide with interlaced
    mbs and CID1260. 2008 specs do not know about it, and maintain qscale
    is 11 bits. This looks oversized, but may help larger bitdepths.

    Currently, it leads to an obviously incorrect qscale value, meaning
    its syntax is shifted by 1. However, reading 11 bits also leads to
    obviously incorrect decoding : qscale seems to be 10 bits.

    However, as most profiles still have 11bits qscale, the feature is
    restricted to the CID1260 profile (this flag is dependent on
    a higher-level flag located in the header).

    The encoder writes 12 bits of syntax, last and first bits always 0,
    which is now somewhat inconsistent with the decoder, but ends up with
    the same effect (progressive + reserved bit).

    Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>

    • [DBH] libavcodec/dnxhddec.c
  • dnxhddec : Decode and use interlace mb flag

    26 septembre 2015, par Christophe Gisquet
    dnxhddec : Decode and use interlace mb flag
    

    This bit is 1 in some samples, and seems to coincide with interlaced
    mbs and CID1260. 2008 specs do not know about it, and maintain qscale
    is 11 bits. This looks oversized, but may help larger bitdepths.

    Currently, it leads to an obviously incorrect qscale value, meaning
    its syntax is shifted by 1. However, reading 11 bits also leads to
    obviously incorrect decoding : qscale seems to be 10 bits.

    However, as most profiles still have 11bits qscale, the feature is
    restricted to the CID1260 profile (this flag is dependent on
    a higher-level flag located in the header).

    The encoder writes 12 bits of syntax, last and first bits always 0,
    which is now somewhat inconsistent with the decoder, but ends up with
    the same effect (progressive + reserved bit).

    Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>

    • [DH] libavcodec/dnxhddec.c