Hi
I want to convert the AVFrames into a bmp file. The code *Hoang Ong *has
provided works good for JPEG. But when I change the codec to CODEC_ID_BMP
and the pixelformat to PIX_FMT_RGB32 my bitmap is not saved. Can you help me
how to convert it to BMP. Here is the code that I am using
int WriteBMP (AVCodecContext *pCodecCtx, AVFrame *pFrame, int FrameNo){
AVCodecContext *pOCodecCtx;
AVCodec *pOCodec;
uint8_t *Buffer;
int BufSiz;
int BufSizActual;
int ImgFmt = PIX_FMT_RGB32; //for the newer
ffmpeg version, this int to pixelformat
FILE *BMPFile;
char BMPName[256];
BufSiz = avpicture_get_size (
ImgFmt,pCodecCtx->width,pCodecCtx->height );
Buffer = (uint8_t *)malloc ( BufSiz );
if ( Buffer == NULL )
return ( 0 );
memset ( Buffer, 0, BufSiz );
pOCodecCtx = avcodec_alloc_context ( );
if ( !pOCodecCtx ) {
free ( Buffer );
return ( 0 );
}
pOCodecCtx->bit_rate = pCodecCtx->bit_rate;
pOCodecCtx->bit_rate_tolerance =
pCodecCtx->bit_rate_tolerance;
pOCodecCtx->width = pCodecCtx->width;
pOCodecCtx->height = pCodecCtx->height;
pOCodecCtx->pix_fmt = ImgFmt;
pOCodecCtx->codec_id = CODEC_ID_BMP;
pOCodecCtx->codec_type = CODEC_TYPE_VIDEO;
pOCodecCtx->time_base.num = pCodecCtx->time_base.num;
pOCodecCtx->time_base.den = pCodecCtx->time_base.den;
pOCodec = avcodec_find_encoder ( pOCodecCtx->codec_id );
if ( !pOCodec ) {
free ( Buffer );
return ( 0 );
}
if ( avcodec_open ( pOCodecCtx, pOCodec ) < 0 ) {
free ( Buffer );
return ( 0 );
}
pOCodecCtx->mb_lmin = pOCodecCtx->lmin =
pOCodecCtx->qmin * FF_QP2LAMBDA;
pOCodecCtx->mb_lmax = pOCodecCtx->lmax =
pOCodecCtx->qmax * FF_QP2LAMBDA;
pOCodecCtx->flags = CODEC_FLAG_QSCALE;
pOCodecCtx->global_quality = pOCodecCtx->qmin * FF_QP2LAMBDA;
pFrame->pts = 1;
pFrame->quality = pOCodecCtx->global_quality;
BufSizActual = avcodec_encode_video(pOCodecCtx,Buffer,BufSiz,pFrame
);
sprintf ( BMPName, "%d.bmp", FrameNo );
BMPFile = fopen ( BMPName, "wb" );
fwrite ( Buffer, 1, BufSizActual, BMPFile );
fclose ( BMPFile );
avcodec_close ( pOCodecCtx );
free ( Buffer );
return ( BufSizActual );
}
Thanks
Varun Dua
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