Hi to All. I use FFMPEG 1.2 in my software to decompress H264 video packet from
IP camera. I have on some error in the log like Frame Num Gap or concealing
3600 DC, 3600 AC, 3600 MV errors in P frame,top block unavailable for requested
intra mode at 35 2, error while decoding MB 35 2, concealing 3600 DC, 3600 AC,
3600 MV errors in I frame ".....
I see there is a new version of FFMPEG, with avcodec55.dll, ... which fix somes
bugs on h264
But my code work perfect with FFMPEG1.2 and doesn"t work with the last dll
files of FFMPEG ,I get them on Latest Zeranoe FFmpeg Build Version: git-e0be3cb
(2013-07-03). it seems with the last avcodec file, the function
avcodec_decode_video2 return me 0 and in the log I have "no frame"
...
If someone can explain me what' s the major difference between the version 1.2
and the lastest one, beacsue I'm looking for the major changes, but I can't
understand why my code below doesn't work.
Thanks for yours answers
Variables:
AVPixelFormat m_AVPixelFormat;
AVCodecContext* m_lpCodecCtx;
AVCodec* m_lpCodec;
AVFrame* m_lpFrame;
AVPacket m_lpPacket;
AVPicture m_lpPict;
SwsContext* m_lpSwsContext;
INT m_iThreadCount;
LPBYTE m_lpFFMPEGBuffer;
INT iImageWidth, iImageHeigh;
Of course I before init libraries :
av_register_all();
av_lockmgr_register(&ff_lockmgr);
with
static int ff_lockmgr(void **mutex, enum AVLockOp op)
//////////////////////////////////////////////////////////////////////////////////////////////////////
{ CRITICAL_SECTION **cSec = (CRITICAL_SECTION **)mutex;
switch (op)
{ case AV_LOCK_CREATE:
{ *cSec = new CRITICAL_SECTION();
if (*cSec == NULL) return 1;
InitializeCriticalSection(*cSec);
return 0;
}
case AV_LOCK_OBTAIN:
{ if (*cSec == NULL) return 1;
EnterCriticalSection(*cSec);
return 0;
}
case AV_LOCK_RELEASE:
{ if (*cSec == NULL) return 1;
LeaveCriticalSection(*cSec);
return 0;
}
case AV_LOCK_DESTROY:
{ if (*cSec == NULL) return 1;
DeleteCriticalSection(*cSec);
delete *cSec;
*cSec = NULL;
return 0;
}
}
return 0;
}
The lpImageData and dwImageSize I decode is a whole frame I receive from RTP
packet from the camera and I « format » to send to FFMPEG decoder
I also ahve verify the iImageWidth and iImageHeight are well set too.
BOOL FFMpegDecompress( LPBYTE lpImageData, DWORD dwImageSize)
{ if (m_lpCodec==NULL)
{ // find_decoder
m_lpCodec = avcodec_find_decoder(CODEC_ID_H264);
}
if ((m_lpCodec != NULL)&&(m_lpCodecCtx == NULL))
{ // Alloc codecContext
m_lpCodecCtx = avcodec_alloc_context3(m_lpCodec);
if (m_lpCodecCtx != NULL)
{ // Init CodecContext
if (m_lpCodecCtx->width == 0)
{ m_lpCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
m_lpCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
m_lpCodecCtx->codec_id = CODEC_ID_H264;
m_lpCodecCtx->coded_width = iImageWidth;
m_lpCodecCtx->coded_height = iImageHeight;
m_lpCodecCtx->width = iImageWidth;
m_lpCodecCtx->height = iImageHeight;
m_lpCodecCtx->thread_count = 3;
m_lpCodecCtx->thread_type = FF_THREAD_SLICE;
m_lpCodecCtx->err_recognition = AV_EF_EXPLODE;
}
}
}
dwWidth = iImageWidth;
dwHeight = iImageHeight;
// open decoder if not...
if ((m_lpCodecCtx!=NULL) &&
(m_lpCodec!=NULL)&&(!lpfnavcodec_is_open(m_lpCodecCtx)))
{ if ( m_lpCodec != NULL)
{ if(m_lpCodec->capabilities&CODEC_CAP_TRUNCATED)
m_lpCodecCtx->flags|= CODEC_FLAG_TRUNCATED;
iResult = avcodec_open2( m_lpCodecCtx, m_lpCodec, &optionsDict);
// if error
if (iResult < 0)
{ avcodec_close(m_lpCodecCtx);
av_free(m_lpCodecCtx);
m_lpCodecCtx = NULL;
m_lpCodec = NULL;
}
}
}
if ((m_lpCodecCtx!=NULL) && (m_lpCodec!=NULL))
{ // Allouer la frame video
if (m_lpFrame == NULL)
{ m_lpFrame = avcodec_alloc_frame();
}
// Si l'allocation à réussi
if (m_lpFrame!=NULL)
{ // Affecter les dimensions
m_lpFrame->width = m_lpCodecCtx->width;
m_lpFrame->height = m_lpCodecCtx->height;
}
if ((m_lpCodecCtx != NULL) && ( m_lpCodec != NULL) &&(m_lpFrame !=
NULL) && (pddsDesc != NULL))
if ((dwWidth>0)&&(dwHeight>0))
{ int iRes = 0;
// init packet
av_init_packet(&m_lpPacket);
if (m_lpFFMPEGBuffer == NULL)
{ m_lpFFMPEGBuffer = new
BYTE[MAX_MPEG4VIDEO_FRAMESIZE+FF_INPUT_BUFFER_PADDING_SIZE];
}
if (m_lpFFMPEGBuffer !=NULL)
{ ZeroMemory( m_lpFFMPEGBuffer,
MAX_MPEG4VIDEO_FRAMESIZE+FF_INPUT_BUFFER_PADDING_SIZE);
CopyMemory(m_lpFFMPEGBuffer, lpImageData, dwImageSize);
}
// set data
m_lpPacket.data = m_lpFFMPEGBuffer;
// Set size
m_lpPacket.size = dwImageSize;
// Decode H264
if ((m_lpFrame!=NULL)&&(m_lpPacket.size>0))
{ while (m_lpPacket.size>0)
{ iRes = navcodec_decode_video2( m_lpCodecCtx, m_lpFrame,
&iFrameFinished, &m_lpPacket);
if (iRes<=0)
{ break;
}
if (iRes>0)
{ m_lpPacket.data+=iRes;
m_lpPacket.size-=iRes;
}
}
}
// free Packet
av_free_packet(&m_lpPacket);
}
}
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