[FFmpeg-trac] #3757(avcodec:open): -b_strategy 2 may cause severe artifacts

[FFmpeg]

#3757: -b_strategy 2 may cause severe artifacts
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             Reporter:  ejlasota    |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  important   |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  regression  |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Changes (by cehoyos):

 * keywords:   => regression
 * priority:  normal => important
 * status:  new => open
 * reproduced:  0 => 1


Comment:

 Regression since 59a53842

 For future tickets: Please always post your failing FFmpeg command line
 together with the complete, uncut console output.
 {{{
 $ ffmpeg -f lavfi -i testsrc -bf 16 -b_strategy 2 -q:v 2 -t 2 out.avi
 ffmpeg version N-64445-ga53c5d4 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Jul  6 2014 12:57:03 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 90.101 / 52. 90.101
   libavcodec     55. 68.101 / 55. 68.101
   libavformat    55. 45.100 / 55. 45.100
   libavdevice    55. 13.101 / 55. 13.101
   libavfilter     4. 10.100 /  4. 10.100
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, lavfi, from 'testsrc':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 [avi @ 0x27c2580] Using AVStream.codec.time_base as a timebase hint to the
 muxer is deprecated. Set AVStream.time_base instead.
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf55.45.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x240 [SAR
 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc55.68.101 mpeg4
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 frame=   50 fps=7.7 q=2.0 Lsize=     311kB time=00:00:01.96
 bitrate=1299.2kbits/s
 video:304kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 2.242409%
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3757#comment:2>
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