[Libav-user] Crash on avio_close when setting seekable=1

[Sean.T]

I updated to the latest code from git and am getting a system access
violation exception when calling avio_close if i set the format context
pb->seekable=1

repro code here:

            var outputFormat = av_guess_format("mp4", @"D:\test.mp4", null);
            var formatContext = avformat_alloc_context();
            formatContext->oformat = outputFormat;
            var videoStream = avformat_new_stream(formatContext, null);
            var videoCodec =
avcodec_find_encoder(AVCodecID.AV_CODEC_ID_H264);
            var videoCodecContext = avcodec_alloc_context3(videoCodec);
            avcodec_open2(videoCodecContext, videoCodec, null);
            avio_open(&formatContext->pb, @"D:\test.mp4", AVIO_FLAG_WRITE);
            formatContext->pb->seekable = 1; //<-- comment out to fix
            avformat_write_header(formatContext, null);
            avio_close(formatContext->pb);//<-- crashes
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