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• Revision 31020 : max = 255, ça bloquait la création de la table sur certaine base

  20 août 2009, par vincent@… — Log

  max = 255, ça bloquait la création de la table sur certaine base

• Revision 37427 : mmmh c’est l’inverse manuel écrit brutalement ... non manuel d’une manière ...

  19 avril 2010, par kent1@… — Log

  mmmh c’est l’inverse manuel écrit brutalement ... non manuel d’une manière plus smooth

• avio_open crashes, avcodec_copy_context doesn't work

  5 mars 2017, par Nulano

  I’m trying to port https://ffmpeg.org/doxygen/trunk/doc_2examples_2remuxing_8c-example.html to JavaCPP Presets for FFmpeg https://github.com/bytedeco/javacpp-presets/tree/master/ffmpeg.

  I have this so far :

  av_register_all();
  
  
  
  AVFormatContext inFmtCtx = new AVFormatContext(null);
  
  if (avformat_open_input(inFmtCtx, "file.ts", null, null) != 0)
  
      throw new Exception("Could not open input file");
  
  if (avformat_find_stream_info(inFmtCtx, (PointerPointer)null) != 0)
  
      throw new Exception("Failed to retrieve input stream information");
  
  av_dump_format(inFmtCtx, 0, "file.ts", 0);
  
  
  
  AVFormatContext outFmtCtx = new AVFormatContext(null);
  
  avformat_alloc_output_context2(outFmtCtx, null, null, "file2.ts");
  
  AVOutputFormat outFmt = outFmtCtx.oformat();
  
  for (int i = 0; i < inFmtCtx.nb_streams(); i++) {
  
      AVStream inStr = inFmtCtx.streams(i);
  
      AVStream outStr = avformat_new_stream(outFmtCtx, inStr.codec().codec());
  
      if (outStr.isNull()) throw new Exception("Failed allocating output stream");
  
      if (avcodec_copy_context(outStr.codec(), inStr.codec()) != 0)
  
          throw new Exception("Failed to copy context from input to"+
  
                              " output stream codec context");
  
      if ((outFmtCtx.oformat().flags() & AVFMT_GLOBALHEADER) != 0)
  
          outStr.codec().flags(outStr.codec().flags() | CODEC_FLAG_GLOBAL_HEADER);
  
  }
  
  av_dump_format(outFmtCtx, 0, "file2.ts", 1);
  
  
  
  if ((outFmt.flags() & AVFMT_NOFILE) == 0)
  
      if (avio_open(outFmtCtx.pb(), "file2.ts", AVIO_FLAG_WRITE) != 0)
  
          throw new Exception("Could not open output file");

  The problem is, that the avio_open call causes the JVM to crash with an access violation.

  Stack: [0x00000000037e0000,0x00000000038e0000],  sp=0x00000000038df6d0,  free space=1021k
  
  Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
  
  C  [avformat-57.dll+0x28877]
  
  C  [jniavformat.dll+0x383cb]
  
  C  0x0000000003bcdfcc
  
  
  
  Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
  
  j  org.bytedeco.javacpp.avformat.avio_open(Lorg/bytedeco/javacpp/avformat$AVIOContext;Ljava/lang/String;I)I+0
  
  j  TestRemuxer.main([Ljava/lang/String;)V+226
  
  v  ~StubRoutines::call_stub

  This is the output (without the crash message) :

  Input #0, mpegts, from 'file.ts':
  
    Duration: 00:00:17.60, start: 0.000000, bitrate: 1016 kb/s
  
    Program 1 
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 636x480 [SAR 900:901 DAR 45:34], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
  
      Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 194 kb/s
  
  Output #0, mpegts, to 'file2.ts':
  
      Stream #0:0: Unknown: none
  
      Stream #0:1: Unknown: none

  I suspect the cause of the access violation is the same as what causes the output streams to be unknown. However, if I pause debugging on the second av_dump_format call, I can use Evaluate to verify, that the codecs were copied properly. (I checked the FFmpeg sources, and I know that a stream is dumped as Unknown, if and only if its codec_type is set to an invalid value, however the value is correctly 0 for the first stream and 1 for the second stream.)