[FFmpeg-trac] #3091(undetermined:new): High Bitrate I-frame CBR MPEG encoding causes error

[FFmpeg]

#3091: High Bitrate I-frame CBR MPEG encoding causes error
-------------------------------------+-------------------------------------
             Reporter:  ortoni       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 The documentations states that the default for {{{-bt}}} is 4M (and that a
 too small value is bad for quality). For some (sufficiently large)
 bitrate, the default must be too small to even encode. FFmpeg is warning
 that you have to increase the value. I wonder what could be changed.
 {{{
 $ ffmpeg -f lavfi -i testsrc=s=1920x1080 -vcodec mpeg2video -pix_fmt
 yuv422p -intra -flags +ildct+ilme -b:v 150M -minrate 150M -maxrate 150M
 -bufsize 47185920 -r 25 -f null -
 ffmpeg version N-57552-g0e85bfe Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Oct 30 2013 00:35:19 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 48.100 / 52. 48.100
   libavcodec     55. 39.100 / 55. 39.100
   libavformat    55. 19.104 / 55. 19.104
   libavdevice    55.  5.100 / 55.  5.100
   libavfilter     3. 90.100 /  3. 90.100
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, lavfi, from 'testsrc=s=1920x1080':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1920x1080
 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
 [mpeg2video @ 0x1bbabe0] bitrate tolerance too small for bitrate
 Output #0, null, to 'pipe:':
     Stream #0:0: Video: mpeg2video, yuv422p, 1920x1080 [SAR 1:1 DAR 16:9],
 q=2-31, 150000 kb/s, 90k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo -> mpeg2video)
 Error while opening encoder for output stream #0:0 - maybe incorrect
 parameters such as bit_rate, rate, width or height
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3091#comment:3>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker