[FFmpeg-trac] #4404(avcodec:new): Cannot decode PNG or TIF files with libavcodec.

FFmpeg trac at avcodec.org
Tue Mar 31 23:31:44 CEST 2015

#4404: Cannot decode PNG or TIF files with libavcodec.
             Reporter:  sgan         |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  unspecified  |               Resolution:
             Keywords:  PNG          |               Blocked By:
  avcodec_decode_video2              |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |

Comment (by sgan):

 I am following investigations!!

 In fact, the original code
 [http://ffmpeg.org/doxygen/trunk/lavfutils_8c_source.html#l00024] is
 working for PNG if we set the AVCodecContext::thread_count attribute to 1.

 ex at line 59:     format_ctx->streams[0]->codec->thread_count=1;

 This is a workaround and I do not know why it is working. Problem should
 be analyse now deeply by developers.

 The problem is connected to the following point:



Ticket URL: <https://trac.ffmpeg.org/ticket/4404#comment:2>
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