[FFmpeg-trac] #1927(undetermined:new): Seek bug in rv40 video after resolution change

[FFmpeg]

#1927: Seek bug in rv40 video after resolution change
-------------------------------------+-------------------------------------
             Reporter:  DonMoir      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 After the resolution changes in the attached file which is from ticket
 #1507, any attempt to seek to absolute zero will cause distortion. For the
 video stream, the first index entry timestamp is zero and the first_dts is
 zero. Any value greater than zero and it works. The reason for the
 distortion is because the packets contain the old resolution values, as
 does the AVFrame and AVCodecContext.

 You can seek to zero fine before the resolution change.

 The best way to show you the problem is to make ffplay loop. This is
 because using left arrow does not go back far enough in time to produce
 the problem and by allowing ffplay to loop it will seek to zero or to the
 very beginning of playback.

 This is not an ffplay problem as I can reproduce it in my own code.

 After the loop back to zero it will correct itself and get the resolution
 change about 6/7 seconds into playback.

 ffplay -loop 10 Wrong_aspect_after_resolution_change.rmvb
 ffplay version N-46469-gc995644 Copyright (c) 2003-2012 the FFmpeg
 developers
   built on Nov  5 2012 17:56:17 with gcc 4.7.2 (GCC)
   configuration: --disable-static --enable-shared --enable-gpl --enable-
 version3
  --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-
 bzlib
 --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-
 libopencore-
 amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-
 libnut -
 -enable-libopenjpeg --enable-libopus --enable-librtmp --enable-
 libschroedinger -
 -enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-
 aacenc --
 enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264
 --enab
 le-libxavs --enable-libxvid --enable-zlib
   libavutil      52.  5.100 / 52.  5.100
   libavcodec     54. 71.100 / 54. 71.100
   libavformat    54. 36.100 / 54. 36.100
   libavdevice    54.  3.100 / 54.  3.100
   libavfilter     3. 21.106 /  3. 21.106
   libswscale      2.  1.102 /  2.  1.102
   libswresample   0. 16.100 /  0. 16.100
   libpostproc    52.  1.100 / 52.  1.100
 Input #0, rm, from 'Wrong_aspect_after_resolution_change.rmvb':
   Metadata:
     Audiences       : Easy RealMedia Tool's Audience;
     audioMode       : music
     Creation Date   : 3/22/2005 10:25:31
     Description     :
 +ú+++·+˜ú¦¦+-+¦¦+«¦¼+¦íó++-++·+¦+++Ñ-¬-°ú¼+÷¦¬+÷+-+¦-++¦+˜
 -º
                     :
 -¦íó++-˜+«++íú¦+¦t+¦¦µ+¿¦T+¡¦t+¦¦½-+-·+-íú++¦++T+»+=+÷+-¦+
 ¦+¦½+¬¦
     Email           : rick at redcheek.net
     Generated By    : Easy RealMedia Tools V1.8
     HomeWeb         : http://redcheek.net
     Keywords        :
     Modification Date: 3/22/2005 10:25:31
     videoMode       : sharp
     File ID         : 545932b0-2885-caea-bdd7-d268c869a693
     title           : [YY]0419.¦++-+¦¦¦_¦¦¦·+t+¦+-+n-O-¦f(+-)- -++-¦8
 +¦-([YY]¦ñ
 +˜-- YYTvO+¦+˜
     author          : feng
     copyright       : YY at 2005
     comment         :
   Duration: 00:43:16.92, start: 0.000000, bitrate: 7 kb/s
     Stream #0:0: Audio: cook (cook / 0x6B6F6F63), 44100 Hz, stereo, fltp,
 44 kb/s
     Stream #0:1: Video: rv40 (RV40 / 0x30345652), yuv420p, 480x360, 391
 kb/s, 23
  fps, 23 tbr, 1k tbn, 1k tbc
 Frame changed from size:0x0 to size:480x360  97KB sq=    0B f=0/0
   15.74 A-V: -0.017 f[rv40 @ 0119d800] d= Changing dimensions to 480x288
   15.82 A-V: -0.021 fd=   7 aq=    1KB vq=   28KB sq=   Frame changed from
 size:
 480x360 to size:480x288
   39.3[rv40 @ 0117dc20] 6 AFirst slice header is incorrectB f=0/0
 [rv40 @ 0119d800] warning: first frame is no keyframe    0B f=0/0
    9.76 A-V: -0.004[rv40 @ 0119d800]  fdChanging dimensions to 480x360
    9.83 A-V: -0.008 fd=  60 aq=    1KB vq=   4Frame changed from
 size:480x288 to
  size:480x360
   12.34 A-V:  0.086 fd=  62 aq=    1KB vq=   17KB sq=    0B f=0/1

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1927>
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