[FFmpeg-trac] #11329(avformat:new): Give segfault where you don't use input datas

[FFmpeg]

#11329: Give segfault where you don't use input datas
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             Reporter:  Rm Beer   |                     Type:  defect
               Status:  new       |                 Priority:  important
            Component:  avformat  |                  Version:  5.1.2
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 I'm programming in C with the ffmpeg libraries, so far I can record an mp4
 video without problems except for the fact that the av_write_trailer
 function is giving segmentation fault on line 1253 of ./libavformat/mux.c,
 as I'm seeing the The reason is because I did not use input data at any
 time.

 int av_write_trailer(AVFormatContext *s)
 {
     FFFormatContext *const si = ffformatcontext(s);
     AVPacket *const pkt = si->parse_pkt; // <<<=== The segfault line
     int ret1, ret = 0;
  :
  :
  :

 parse_pkt seem a temp paquet that ffmpeg are use, and it's related to the
 input datas that i never use.

 The bug? That ffmpeg can't support without input data.
 There are cases like mine in which the input data is not necessary and
 only the output data is needed, there are programs that are used only for
 streaming or saving to video or audio files such as mp4. In such cases
 there is no input data, it is generated by the program that the developer
 creates.
 The only thing I can think of is generating junk data as input data even
 though I'm never going to use it. But I prefer to wait for the response
 from the ffmpeg developers who know more about how it works, to see if
 they have a better solution to the problem.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11329>
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