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• dnxhddec: Decode and use interlace mb flag

  26 September 2015, by 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

  25 September 2015, by 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

• ffmpeg convert any file to any file

  28 May 2015, by Vishnu

  I Want simple command to convert any supported file to any file with little possible video compression.

  for example

  avi to mp4
  
  mp4 to 3gp
  
  .
  
  .etc..

  I tried below code

  ffmpeg -i infile.flv outfile.3gp

  It works for some but for some other like flv to 3gp conversion it throws error like below and also output file size is very large than input.

  "Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height" 

  P:s i compiled with below librareis

  ./configure --enable-version3 --enable-libopencore-amrnb --enable-libvo-aacenc --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-gpl --enable-postproc --enable-nonfree

  full response

  array(48) {
  
    [0]=>
  
    string(77) "ffmpeg version N-72286-gd9b264b Copyright (c) 2000-2015 the FFmpeg developers"
  
    [1]=>
  
    string(56) "  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-11)"
  
    [2]=>
  
    string(261) "  configuration: --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-gpl --enable-postproc --enable-nonfree"
  
    [3]=>
  
    string(40) "  libavutil      54. 23.101 / 54. 23.101"
  
    [4]=>
  
    string(40) "  libavcodec     56. 39.101 / 56. 39.101"
  
    [5]=>
  
    string(40) "  libavformat    56. 33.101 / 56. 33.101"
  
    [6]=>
  
    string(40) "  libavdevice    56.  4.100 / 56.  4.100"
  
    [7]=>
  
    string(40) "  libavfilter     5. 16.101 /  5. 16.101"
  
    [8]=>
  
    string(40) "  libswscale      3.  1.101 /  3.  1.101"
  
    [9]=>
  
    string(40) "  libswresample   1.  1.100 /  1.  1.100"
  
    [10]=>
  
    string(40) "  libpostproc    53.  3.100 / 53.  3.100"
  
    [11]=>
  
    string(32) "Input #0, flv, from 'video.flv':"
  
    [12]=>
  
    string(11) "  Metadata:"
  
    [13]=>
  
    string(25) "    major_brand     : M4V"
  
    [14]=>
  
    string(23) "    minor_version   : 1"
  
    [15]=>
  
    string(39) "    compatible_brands: M4V M4A mp42isom"
  
    [16]=>
  
    string(26) "    date            : 2008"
  
    [17]=>
  
    string(71) "    copyright       : © 2008 Blender Foundation | www.bigbuckbunny.org"
  
    [18]=>
  
    string(36) "    title           : Big Buck Bunny"
  
    [19]=>
  
    string(43) "    artist          : Peach Open Movie Team"
  
    [20]=>
  
    string(56) "    composer        : Sacha Goedegebure / Ton Roosendaal"
  
    [21]=>
  
    string(35) "    encoder         : Lavf55.33.100"
  
    [22]=>
  
    string(59) "  Duration: 00:09:56.58, start: 0.058000, bitrate: 663 kb/s"
  
    [23]=>
  
    string(88) "    Stream #0:0: Video: h264 (High), yuv420p, 640x360, 24.42 fps, 24 tbr, 1k tbn, 48 tbc"
  
    [24]=>
  
    string(61) "    Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s"
  
    [25]=>
  
    string(90) "[h263 @ 0x1ef5f60] The specified picture size of 640x360 is not valid for the H.263 codec."
  
    [26]=>
  
    string(77) "Valid sizes are 128x96, 176x144, 352x288, 704x576, and 1408x1152. Try H.263+."
  
    [27]=>
  
    string(33) "Output #0, 3gp, to 'outfile.3gp':"
  
    [28]=>
  
    string(11) "  Metadata:"
  
    [29]=>
  
    string(25) "    major_brand     : M4V"
  
    [30]=>
  
    string(23) "    minor_version   : 1"
  
    [31]=>
  
    string(39) "    compatible_brands: M4V M4A mp42isom"
  
    [32]=>
  
    string(26) "    date            : 2008"
  
    [33]=>
  
    string(71) "    copyright       : © 2008 Blender Foundation | www.bigbuckbunny.org"
  
    [34]=>
  
    string(36) "    title           : Big Buck Bunny"
  
    [35]=>
  
    string(43) "    artist          : Peach Open Movie Team"
  
    [36]=>
  
    string(56) "    composer        : Sacha Goedegebure / Ton Roosendaal"
  
    [37]=>
  
    string(35) "    encoder         : Lavf55.33.100"
  
    [38]=>
  
    string(60) "    Stream #0:0: Video: h263, none, q=2-31, 128 kb/s, 24 fps"
  
    [39]=>
  
    string(13) "    Metadata:"
  
    [40]=>
  
    string(42) "      encoder         : Lavc56.39.101 h263"
  
    [41]=>
  
    string(52) "    Stream #0:1: Audio: amr_nb, 0 channels, 128 kb/s"
  
    [42]=>
  
    string(13) "    Metadata:"
  
    [43]=>
  
    string(55) "      encoder         : Lavc56.39.101 libopencore_amrnb"
  
    [44]=>
  
    string(15) "Stream mapping:"
  
    [45]=>
  
    string(54) "  Stream #0:0 -> #0:0 (h264 (native) -> h263 (native))"
  
    [46]=>
  
    string(66) "  Stream #0:1 -> #0:1 (mp3 (native) -> amr_nb (libopencore_amrnb))"
  
    [47]=>
  
    string(119) "Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height"
  
  }