[Theora-dev] Theora decode problem

[Shana Cooke (Gitnick)]

I am trying to write a sample app that uses Theora for encoding/decoding
a network video stream. Unfortunately, I keep running into this error: 

Run-Time Check Failure #3 - The variable 'MVect' is being used without
being defined.

It always happens on decryption, line 467 in decode.c.  The issue is
that CodingMethod is equal to 5 (CODE_GOLDENFRAME), which doesn't
initialize the moving vectors - and yet it goes into this area anyway
and promptly blows up because the moving vectors are garbage.

I'm not sure what I'm doing wrong. Here's my encryption initialization:

  theora_info_init(&m_ti);
  m_ti.width=176;	
  m_ti.height=144;
  m_ti.frame_width=176;
  m_ti.frame_height=144;
  m_ti.offset_x=0;
  m_ti.offset_y=0;
  m_ti.fps_denominator=(ogg_uint32_t)1000000.0;
  m_ti.fps_numerator=10 * m_ti.fps_denominator;		//10 is 10
frames per second
  m_ti.aspect_numerator=1;		
  m_ti.aspect_denominator=1;	
  m_ti.colorspace=OC_CS_UNSPECIFIED;
  m_ti.target_bitrate=0;		// 0 if we are specifying
quality
  m_ti.quality=5;			// from 0 to 10, 10 is highest
quality but higher files

  m_ti.dropframes_p=0;
  m_ti.quick_p=1;			// should always be 1
  m_ti.keyframe_auto_p=1;	
  m_ti.keyframe_frequency=64;
  m_ti.keyframe_frequency_force=64;
 
m_ti.keyframe_data_target_bitrate=(ogg_uint32_t)(m_ti.target_bitrate*1.5
);
  m_ti.keyframe_auto_threshold=80;
  m_ti.keyframe_mindistance=8;
  m_ti.noise_sensitivity=1;

  theora_encode_init(&m_td,&m_ti);
  theora_info_clear(&m_ti);

Here is my decrypt init. Since I can join the stream of theora packets
(enclosed in ogg packets) at any time, I don't get headers, but I know
what format I'm sending them in anyway since I'm the one sending them in
the first place.

    theora_info_init(&m_ti);
  m_ti.width=176;	
  m_ti.height=144;
  m_ti.frame_width=176;
  m_ti.frame_height=144;
  m_ti.offset_x=0;
  m_ti.offset_y=0;
  m_ti.fps_denominator=(ogg_uint32_t)1000000.0;
  m_ti.fps_numerator=10 * m_ti.fps_denominator;		//10 is 10
frames per second
  m_ti.aspect_numerator=1;		
  m_ti.aspect_denominator=1;	
  m_ti.colorspace=OC_CS_UNSPECIFIED;
  m_ti.target_bitrate=0;		// 0 if we are specifying
quality
  m_ti.quality=5;			// from 0 to 10, 10 is highest
quality but higher files

  m_ti.dropframes_p=0;
  m_ti.quick_p=1;			// should always be 1
  m_ti.keyframe_auto_p=1;	
  m_ti.keyframe_frequency=64;
  m_ti.keyframe_frequency_force=64;
 
m_ti.keyframe_data_target_bitrate=(ogg_uint32_t)(m_ti.target_bitrate*1.5
);
  m_ti.keyframe_auto_threshold=80;
  m_ti.keyframe_mindistance=8;
  m_ti.noise_sensitivity=1;

  theora_decode_init(&m_td,&m_ti);


Any advice? I know the packets are received intact on the other end,
however, I keep getting stuck on this line in the compiler.

There must be something wrong with my encryption/decryption
initialization to cause it to enter this wrong code segment.

Shana