[FFmpeg-trac] #10005(undetermined:closed): ffmpeg creates different output when jpeg file does not have a .jpg extension

[FFmpeg]

#10005: ffmpeg creates different output when jpeg file does not have a .jpg
extension
-------------------------------------+-------------------------------------
             Reporter:  Brett        |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Carl Eugen Hoyos):

 * keywords:  jpeg =>
 * resolution:   => invalid
 * status:  new => closed
 * component:  ffmpeg => undetermined

Comment:

 The file IMG contains two concatenated jpeg images, you can test this for
 example with:
 $ ffmpeg -i IMG -vcodec copy out%1d.jpg
 The pipe demuxer (that correctly auto-detected the format of IMG being
 jpeg) cannot know that you only want to decode the first image unless you
 tell it while the image2 demuxer (that at least in some cases is preferred
 for files with suffix .jpg over the pipe demuxer) only reads the first
 image. There is no issue that can be fixed.
 Please note that you cannot create "good" gifs with your command line,
 please look at the documentation for the palettegen and paletteuse
 filters:
 https://ffmpeg.org/ffmpeg-filters.html#palettegen-1
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10005#comment:1>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker