[FFmpeg-trac] #1388(undetermined:new): rv30 decoder does not completely support resolution changes

[FFmpeg]

#1388: rv30 decoder does not completely support resolution changes
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  realvideo
             Blocked By:             |  rm
Reproduced by developer:  1          |               Blocking:
                                     |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 (bug 299)
 I will attach a rv30 sample that continuously changes resolution between
 354x288 and 256x208, plays fine with mplayer -vc rv3040.
 FFmpeg (and mplayer -vc ffrv30) mostly manages the first change from large
 to small (except that the first keyframe after the change is dropped), but
 ignores the changes from small to large, leading to massive corruption
 (and messages).
 {{{
 $ ffmpeg -i teenagelament_cut.ram -qscale 2 -t 16 out.avi
 ffmpeg version N-41200-gaac41ec Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jun  1 2012 10:02:11 with gcc 4.3.2
   configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-
 libopenjpeg --enable-libvorbis --enable-libspeex --enable-libmp3lame
 --enable-libtheora --extra-ldflags=-lm --enable-libvpx --enable-libxavs
   libavutil      51. 55.100 / 51. 55.100
   libavcodec     54. 23.100 / 54. 23.100
   libavformat    54.  6.101 / 54.  6.101
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     2. 77.100 /  2. 77.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 [rm @ 0x90113c0] Unsupported stream type 0000023e
 Input #0, rm, from 'teenagelament_cut.ram':
   Metadata:
     title           : Teenage Lament '74
     author          :
     copyright       : �2004
     comment         :
   Duration: 00:03:08.86, start: 0.000000, bitrate: 86 kb/s
     Stream #0:0: Audio: cook (cook / 0x6B6F6F63), 44100 Hz, mono, flt, 32
 kb/s
     Stream #0:1: Video: rv30 (RV30 / 0x30335652), yuv420p, 352x288, 117
 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
     Stream #0:2: Data: none
 Please use -q:a or -q:v, -qscale is ambiguous
 [buffer @ 0x909b1c0] w:352 h:288 pixfmt:yuv420p tb:1/1000 sar:0/1
 sws_param:flags=2
 [buffersink @ 0x909b200] No opaque field provided
 Output #0, avi, to 'out.avi':
   Metadata:
     INAM            : Teenage Lament '74
     author          :
     ICOP            : �2004
     ICMT            :
     ISFT            : Lavf54.6.101
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 352x288,
 q=2-31, 200 kb/s, 25 tbn, 25 tbc
     Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, mono, flt
 Stream mapping:
   Stream #0:1 -> #0:0 (rv30 -> mpeg4)
   Stream #0:0 -> #0:1 (cook -> libmp3lame)
 Press [q] to stop, [?] for help
 Changing dimensions to 256x208=    1281kB time=00:00:07.76
 bitrate=1352.7kbits/s
 [rv30 @ 0x9017ce0] warning: first frame is no keyframe
 Input stream #0:1 frame changed from size:352x288 fmt:yuv420p to
 size:256x208 fmt:yuv420p
 [buffer @ 0x9097b00] w:256 h:208 pixfmt:yuv420p tb:1/1000 sar:0/1
 sws_param:flags=2
 [buffersink @ 0x90dd140] No opaque field provided
 [scale @ 0x909ac60] w:256 h:208 fmt:yuv420p sar:0/1 -> w:352 h:288
 fmt:yuv420p sar:0/1 flags:0x4
 Incorrect intra prediction mode    2186kB time=00:00:12.40
 bitrate=1444.1kbits/s
 [rv30 @ 0x9017ce0] concealing 208 DC, 208 AC, 208 MV errors
 [rv30 @ 0x9017ce0] Incorrect intra prediction mode
 [rv30 @ 0x9017ce0] concealing 208 DC, 208 AC, 208 MV errors
 [rv30 @ 0x9017ce0] Incorrect intra prediction mode
 [rv30 @ 0x9017ce0] concealing 208 DC, 208 AC, 208 MV errors
 [rv30 @ 0x9017ce0] Incorrect intra prediction mode
 [rv30 @ 0x9017ce0] concealing 208 DC, 208 AC, 208 MV errors
 [rv30 @ 0x9017ce0] Incorrect intra prediction mode
 [rv30 @ 0x9017ce0] concealing 114 DC, 114 AC, 114 MV errors
 [rv30 @ 0x9017ce0] Incorrect intra prediction mode
 [rv30 @ 0x9017ce0] concealing 114 DC, 114 AC, 114 MV errors
 [rv30 @ 0x9017ce0] Incorrect intra prediction mode
 [rv30 @ 0x9017ce0] concealing 163 DC, 163 AC, 163 MV errors
 frame=  267 fps=138 q=2.0 Lsize=    3057kB time=00:00:16.00
 bitrate=1565.2kbits/s
 video:2898kB audio:125kB global headers:0kB muxing overhead 1.131454%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1388>
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