[FFmpeg-trac] #7313(avformat:new): hls_fmp4_init_filename not properly formated

[FFmpeg]

#7313: hls_fmp4_init_filename not properly formated
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             Reporter:  dennisss  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  1
Analyzed by developer:  1         |
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 The documentation for the `hls_fmp4_init_filename` argument requires that
 if it is given, that it contains a "%v" string that will be replaced with
 the variation number. Likewise this is validated by the code here:
 [https://github.com/FFmpeg/FFmpeg/blob/c5329d64b1264ef1431732aad6f5b08d0c4b55f4/libavformat/hlsenc.c#L2499]


 But if a provide a value for it which is not the default ("init.mp4"), the
 "%v" does not get replaced and instead the variant number seems to have
 the fixed behavior of always appending it to the filename.

 So given a pattern of `something_init_%v.mp4`, it currently outputs a file
 named `something_init_%v_1.mp4`, while I would expect it to output
 `something_init_1.mp4`.

 If it helps, I think that the appending of the variant to the end occurs
 here:
 [https://github.com/FFmpeg/FFmpeg/blob/c5329d64b1264ef1431732aad6f5b08d0c4b55f4/libavformat/hlsenc.c#L2671],
 but there does not appear to be any consideration of "%v" in the string.

 If I comment out the entire validation block referenced in the first link
 and use the input pattern `something_init.mp4`, then it works fine for my
 needs, but is still inconsistent with the documentation.


 How to reproduce:
 {{{
 % ffmpeg ..... -hls_fmp4_init_filename "something_init_%v.mp4" ....
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7313>
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