[FFmpeg-trac] #2788(undetermined:new): wmv3: seek only to keyframes

[FFmpeg]

#2788: wmv3: seek only to keyframes
-------------------------------------+-------------------------------------
               Reporter:  ami_stuff  |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:             |  undetermined
  unspecified                        |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 http://www1.datafilehost.com/d/7d7ae1ff

 When I use this command:

 {{{
 C:\>ffmpegx -ss 3 -i 1.wmv -t 1 out.avi
 ffmpeg version N-54658-g43d3659 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jul 12 2013 02:23:12 with gcc 4.5.0 (GCC) 20100414 (Fedora
 MinGW 4.5.
 0-1.fc14)
   configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build
 --arch=
 x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686
 -pc-min
 gw32-gcc' --enable-w32threads --enable-memalign-hack --enable-runtime-
 cpudetect
 --enable-cross-compile --enable-static --disable-shared --extra-
 libs='-lws2_32 -
 lwinmm -lpthread' --extra-cflags='--static
 -I/var/www/users/research/ffmpeg/snap
 shots/build/include' --extra-ldflags='-static
 -L/var/www/users/research/ffmpeg/s
 napshots/build/lib' --enable-bzlib --enable-zlib --enable-gpl --enable-
 version3
 --enable-nonfree --enable-libx264 --enable-libspeex --enable-libtheora
 --enable-
 libvorbis --enable-libfaac --enable-libxvid --enable-libopencore-amrnb
 --enable-
 libopencore-amrwb --enable-libmp3lame --enable-libvpx --disable-
 decoder=libvpx
   libavutil      52. 39.100 / 52. 39.100
   libavcodec     55. 18.102 / 55. 18.102
   libavformat    55. 12.101 / 55. 12.101
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 80.100 /  3. 80.100
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Guessed Channel Layout for  Input Stream #0.0 : stereo
 Input #0, asf, from '1.wmv':
   Metadata:
     WMFSDKVersion   : 9.00.00.3250
     WMFSDKNeeded    : 0.0.0.0000
     VBR Peak        : 1200000
     Buffer Average  : 31270
     IsVBR           : 1
     DeviceConformanceTemplate: MP at ML
     WM/WMADRCPeakReference: 32767
     WM/WMADRCAverageReference: 11848
   Duration: 00:04:11.33, start: 0.040000, bitrate: 622 kb/s
     Stream #0:0(pol): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz,
 stereo, fltp
 , 96 kb/s
     Stream #0:1(pol): Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p,
 360x288,
 512 kb/s, SAR 1:1 DAR 5:4, 25 tbr, 1k tbn, 1k tbc
 Output #0, avi, to 'out.avi':
   Metadata:
     WMFSDKVersion   : 9.00.00.3250
     WMFSDKNeeded    : 0.0.0.0000
     VBR Peak        : 1200000
     Buffer Average  : 31270
     IsVBR           : 1
     DeviceConformanceTemplate: MP at ML
     WM/WMADRCPeakReference: 32767
     WM/WMADRCAverageReference: 11848
     ISFT            : Lavf55.12.101
     Stream #0:0(pol): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 360x288
 [SAR 1:
 1 DAR 5:4], q=2-31, 200 kb/s, 25 tbn, 25 tbc
     Stream #0:1(pol): Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 44100
 Hz, s
 tereo, fltp
 Stream mapping:
   Stream #0:1 -> #0:0 (wmv3 -> mpeg4)
   Stream #0:0 -> #0:1 (wmav2 -> libmp3lame)
 Press [q] to stop, [?] for help
 Error while decoding stream #0:1: Error number -1 occurred
 [wmv3 @ 0x2123cc0] warning: first frame is no keyframe
     Last message repeated 1 times
 frame=   25 fps=0.0 q=1.6 Lsize=      87kB time=00:00:01.01 bitrate=
 697.4kbits/
 s dup=0 drop=17
 video:46kB audio:28kB subtitle:0 global headers:0kB muxing overhead
 16.876349%
 }}}

 then the first frame in the output file will be damaged/with artefacts.

 The real problem which I would like to see fixed by reporting this issue
 is that when I seek (ffplay) in the attached video with (pressed) left
 mouse button then sometimes I get gray screen/artefacts.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2788>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker