Hi,
I am starting out using ffmpeg and I am trying to turn an AVFrame into a jpg
image. I have used some code I found to try doing this, but it sends me the
error:
"[mjpeg @ 0x8a36ab0]colorspace not supported in jpeg"
It is generated by the code below I think from mpeg video_enc.c in the
libavcodec directory
case CODEC_ID_MJPEG:
if(avctx->pix_fmt != PIX_FMT_YUVJ420P && avctx->pix_fmt !=
PIX_FMT_YUVJ422P &&
((avctx->pix_fmt != PIX_FMT_YUV420P && avctx->pix_fmt !=
PIX_FMT_YUV422P) || avctx->strict_std_compliance>FF_COMPLIANCE_UNOFFICIAL)){
av_log(avctx, AV_LOG_ERROR, "colorspace not supported in
jpeg\n");
return -1;
}
I have tried to look into this, and have discovered that the error is from
changed from PIX_FMT_YUV420P to PIX_FMT_YUV422P with no success. Is there
some way to fix this?
Thanks,
C.
(below is the code I am trying)
http://permalink.gmane.org/gmane.comp.video.ffmpeg.libav.user/5127
int WriteJPEG (AVCodecContext *pCodecCtx, AVFrame *pFrame, int FrameNo){
AVCodecContext *pOCodecCtx;
AVCodec *pOCodec;
uint8_t *Buffer;
int BufSiz;
int BufSizActual;
int ImgFmt = PIX_FMT_YUV420P; //for the newer
ffmpeg version, this int to pixelformat
FILE *JPEGFile;
char JPEGFName[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->width = pCodecCtx->width;
pOCodecCtx->height = pCodecCtx->height;
pOCodecCtx->pix_fmt = ImgFmt;
pOCodecCtx->codec_id = CODEC_ID_MJPEG;
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 );
printf("Could not open codec\n");
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;
printf("hERE3\n");
BufSizActual = avcodec_encode_video(
pOCodecCtx,Buffer,BufSiz,pFrame );
printf("hERE4\n");
sprintf ( JPEGFName, "%06d.jpg", FrameNo );
JPEGFile = fopen ( JPEGFName, "wb" );
fwrite ( Buffer, 1, BufSizActual, JPEGFile );
fclose ( JPEGFile );
avcodec_close ( pOCodecCtx );
free ( Buffer );
return ( BufSizActual );
}
Thank you,
C
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