[FFmpeg-trac] #2788(undetermined:new): wmv3: seek only to keyframes
FFmpeg
trac at avcodec.org
Mon Jul 15 21:45:50 CEST 2013
#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>
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