[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:  Dennis       |                    Owner:  (none)
  Shtatnov                           |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  hls          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Marco O.):

 I have encountered the same problem and sorted out that it happens only
 when there is just *one* variant. By giving a look at the code here
 https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/hlsenc.c#L3001
 one can see that the %v expansion takes place only

 {{{if (hls->nb_varstreams > 1)}}}

 User can avoid this by simply not using the %v wildcard if there is just
 one variant, but this looks to me somewhat as a loss of generality. Fix
 should be easy, just turn the two ifs into

 {{{if (hls->nb_varstreams > 0)}}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/7313#comment:2>
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