[FFmpeg-trac] #1740(avformat:closed): avformat's av_write_trailer have bug.

[FFmpeg]

#1740: avformat's av_write_trailer have bug.
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             Reporter:  kyh96403    |                    Owner:
                 Type:  defect      |                   Status:  closed
             Priority:  important   |                Component:  avformat
              Version:  git-master  |               Resolution:  fixed
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by kyh96403):

 Crash when using ffserver's RTSP UDP connection.
 When close RTSP UDP connection, each RTP also close.
 That code is below..
 {{{
     for(i=0;i<nb_streams;i++) {
         ctx = c->rtp_ctx[i];
         if (ctx) {
             av_write_trailer(ctx);
             av_dict_free(&ctx->metadata);
             av_free(ctx->streams[0]);
             av_free(ctx);
         }
         h = c->rtp_handles[i];
         if (h)
             ffurl_close(h);
     }
 }}}
 You know, c->rtp_ctx[i]->pb using dyn_buf.
 dyn_buf's pb is not safe when after using avio_close_dyn_buf.
 So it is need set pb to NULL or avio_open_dyn_buf before call
 av_write_trailer.
 Old version don't have problem.
 Because av_write_trailer don't using ctx->pb.
 Today that problem is fixed...
 Thanks~~

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1740#comment:3>
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