[FFmpeg-trac] #4404(avcodec:new): Cannot decode PNG or TIF files with libavcodec.
FFmpeg
trac at avcodec.org
Sun Mar 29 14:30:24 CEST 2015
#4404: Cannot decode PNG or TIF files with libavcodec.
-------------------------------------+-------------------------------------
Reporter: sgan | Type: defect
Status: new | Priority: normal
Component: avcodec | Version:
Keywords: PNG | unspecified
avcodec_decode_video2 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
With libavcodec dlls, I cannot decode .PNG or .TIF files format but it is
working fine with .JPEG or .BMP files.
Remark: with ffmpeg.exe, I am able to decode/encode these files (-i
input.png -pix_fmt rgb32 output.bmp)
How to reproduce:
{{{
I am using latest dll provided by Zeranoe FFmpeg:
Build Version: git-cf16b45 (2015-03-29)
libavutil 54. 20.101 / 54. 20.101
libavcodec 56. 31.100 / 56. 31.100
libavformat 56. 26.101 / 56. 26.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 13.101 / 5. 13.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
I am just testing the following code with a .png file:
http://ffmpeg.org/doxygen/trunk/lavfutils_8c_source.html#l00024
}}}
Problem:
At line 77
{{{ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);}}}
ret is >0 and is equal to PNG file size, but frame_decoded=0!!
AVFrame *frame;
According to documentation:
http://ffmpeg.org/doxygen/trunk/group__lavc__decoding.html#ga99ee61b6dcffb7817a275d39da58cc74
"
- ''got_picture_ptr: Zero if no frame could be decompressed, otherwise,
it is nonzero.''
- ''Returns: On error a negative value is returned, otherwise the number
of bytes used or zero if no frame could be decompressed.''"
In our case, we have at the same time :
- got_picture_ptr=0
- Returns=number of bytes used
It seems incompatible.
As said, the code is working fine with jpeg or bmp files.
Problem occurs on 32 or 64 bits dll.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/4404>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
More information about the FFmpeg-trac
mailing list