Hello,
I am trying to encode one single video frame as a jpg image.
This my code:
--------------------------------------------------
void saveFrame(AVFrame *pFrame,char *filename, int i)
{
// pFrame has pix_fmt AV_PIX_FMT_YUV420P
int ret;
FILE *JPEGFile;
AVCodec *jpegCodec = avcodec_find_encoder(AV_CODEC_ID_MJPEG);
if (!jpegCodec) {
return;
}
AVCodecContext *jpegContext = avcodec_alloc_context3(jpegCodec);
if (!jpegContext) {
fprintf(stderr,"Error getting encoder context\n");
return;
}
AVPacket* packet = av_packet_alloc();
jpegContext->height = pFrame->height;
jpegContext->width = pFrame->width;
jpegContext->pix_fmt = AV_PIX_FMT_YUVJ420P;
jpegContext->time_base = (AVRational){1,25};
jpegContext->framerate = (AVRational){25,1};
jpegContext->qcompress = 0.5;
if (avcodec_open2(jpegContext, jpegCodec, NULL) < 0) {
fprintf(stderr,"Error opening encoder\n");
return;
}
ret = avcodec_send_frame(jpegContext,pFrame);
if (ret < 0)
{
write_avErrorMsg(ret,"saveFrame");
return;
}
ret = avcodec_receive_packet(jpegContext,packet);
if (ret < 0)
{
write_avErrorMsg(ret,"saveFrame");
return;
}
JPEGFile = fopen(filename, "wb");
fwrite(packet->data, 1, packet->size, JPEGFile);
fclose(JPEGFile);
av_packet_unref(packet);
avcodec_close(jpegContext);
return;
-----------------------------------------
Calling avcodec_send_frame results in this error:
Assertion ((src_linesize) >= 0 ? (src_linesize) : (-(src_linesize))) >=
bytewidth failed at src/libavutil/imgutils.c:349
Something seems to be wrong with the source (pFrame in my example). I
assume an issue with the bytewidth, because the values of
pFrame->linesize are correct.
How can I fix this problem?
Thanks in advance,
Udo
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