[FFmpeg-trac] #7261(avcodec:new): qsv transcoding doesn't work with a large look_ahead_depth

[FFmpeg]

#7261: qsv transcoding doesn't work with a large look_ahead_depth
-------------------------------------+-------------------------------------
             Reporter:  lizhong1008  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:  git-
             Keywords:  qsv          |  master
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
 Summary of the bug:
 qsv transcoding doesn't work with a large look_ahead_depth
 (look_ahead_depth > 47 doses't work in the example as below).
 Report an error "Cannot allocate memory".

 How to reproduce:
 {{{
 ./ffmpeg -hwaccel qsv -c:v h264_qsv -i ./fate-
 suite/h264-conformance/BA_MW_D.264 -c:v h264_qsv -look_ahead 1
 -look_ahead_depth 47  test.h264

 ffmpeg started on 2018-06-15 at 17:00:55
 Report written to "ffmpeg-20180615-170055.log"
 ffmpeg version N-91267-g238a8ae Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
   configuration: --enable-libmfx --enable-libx264 --enable-gpl --disable-
 optimizations --enable-debug=3
   libavutil      56. 18.102 / 56. 18.102
   libavcodec     58. 20.101 / 58. 20.101
   libavformat    58. 17.100 / 58. 17.100
   libavdevice    58.  4.100 / 58.  4.100
   libavfilter     7. 25.100 /  7. 25.100
   libswscale      5.  2.100 /  5.  2.100
   libswresample   3.  2.100 /  3.  2.100
   libpostproc    55.  2.100 / 55.  2.100
 Input #0, h264, from '/root/ffmpeg_fate_suite_lastest/fate-
 suite/h264-conformance/BA_MW_D.264':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: h264 (Constrained Baseline), yuv420p(progressive),
 176x144, 25 fps, 25 tbr, 1200k tbn, 50 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (h264_qsv) -> h264 (h264_qsv))
 Press [q] to stop, [?] for help
 Output #0, h264, to 'test.h264':
   Metadata:
     encoder         : Lavf58.17.100
     Stream #0:0: Video: h264 (h264_qsv), qsv, 176x144, q=2-31, 1000 kb/s,
 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc58.20.101 h264_qsv
     Side data:
       cpb: bitrate max/min/avg: 0/0/1000000 buffer size: 0 vbv_delay: -1
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 Error while decoding stream #0:0: Cannot allocate memory
 [h264_qsv @ 0x42adf80] get_buffer() failed
 [h264_qsv @ 0x42adf80] Too many errors when draining, this is a bug. Stop
 draining and force EOF.
 Error while decoding stream #0:0: Internal bug, should not have happened
 frame=   56 fps=0.0 q=-0.0 Lsize=     240kB time=00:00:02.52 bitrate=
 780.0kbits/s speed=22.7x
 video:240kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.000000%
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7261>
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