[FFmpeg-trac] #19(FFmpeg:closed): MVs not available

[FFmpeg]

#19: MVs not available
-------------------+----------------------
Reporter:  cosai   |       Owner:  michael
    Type:  defect  |      Status:  closed
Priority:  normal  |   Component:  FFmpeg
 Version:  0.6     |  Resolution:  invalid
Keywords:          |  Blocked By:
Blocking:          |  Reproduced:  0
Analyzed:  1       |
-------------------+----------------------
Changes (by saste):

 * analyzed:  0 => 1
 * status:  open => closed
 * resolution:   => invalid


Comment:

 Replying to [comment:4 cosai]:
 > The upper code is working but creating errors. I have installed the
 newest ffmpeg but I can not again create screenshot.
 > Please see the output below
 >
 >
 > ffmpeg -itsoffset -4 -i ./baby.mpeg -vcodec png -vframes 1 -an -f
 rawvideo -s 320x240 ./babynew.png

 This command is wrong if you want to take just the first picture, you
 should rather do:
 ffmpeg -vframes 1 -i ./baby.mpeg -s 320x240 ./babynew.png

 -f rawvideo and .png are contradicting and will likely cause a wrong
 result.

 Also see the image2 documentation in the manual muxers section to clarify
 the image2 syntax.

 > FFmpeg version 0.6.2, Copyright (c) 2000-2010 the FFmpeg developers
 >   built on Mar 30 2011 08:50:34 with gcc 4.1.2 20080704 (Red Hat
 4.1.2-48)
 >   configuration:
 >   libavutil     50.15. 1 / 50.15. 1
 >   libavcodec    52.72. 2 / 52.72. 2
 >   libavformat   52.64. 2 / 52.64. 2
 >   libavdevice   52. 2. 0 / 52. 2. 0
 >   libswscale     0.11. 0 /  0.11. 0
 > Input #0, mpeg, from './baby.mpeg':
 >   Duration: 26:30:43.71, start: 0.808011, bitrate: 0 kb/s
 >     Stream #0.0[0x1e0]: Video: mpeg1video, yuv420p, 352x240 [PAR 200:219
 DAR 880:657], 334 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
 >     Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, 1 channels, s16, 32 kb/s
 > Output #0, rawvideo, to './baby6.png':
 >   Metadata:
 >     encoder         : Lavf52.64.2
 >     Stream #0.0: Video: png, rgb24, 320x240 [PAR 220:219 DAR 880:657],
 q=2-31, 200 kb/s, 90k tbn, 25 tbc
 > Stream mapping:
 >   Stream #0.0 -> #0.0
 > Press [q] to stop encoding
 > [mpeg1video @ 0xcab67d0]ac-tex damaged at 14 12
 > [mpeg1video @ 0xcab67d0]Warning MVs not available
 > [mpeg1video @ 0xcab67d0]concealing 0 DC, 0 AC, 0 MV errors
 > [mpeg1video @ 0xcab67d0]ac-tex damaged at 12 9
 > [mpeg1video @ 0xcab67d0]concealing 132 DC, 132 AC, 132 MV errors

 These warnings are typical for MJPEG corrupted streams, but usually don't
 compromise the decoding (although with some inevitable artifacts).

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/19#comment:6>
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