Hi everyone!
Im starting to program with libavcodec and the other libraries.
I made a little program that changes the red component of the pixels of every
frame in a video file. I don´t get errors in the compilation, but when I try to
execute
the program, it fails.
If I debug the program, I can see the error is in the function av_write_frame,
but I
don´t know what I´m doing wrong...
This is a part of my code:
<code>
AVFormatContext *pFormatCtx;
AVFormatContext *pFormatCtxOut;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame;
AVFrame *pFrameRGB;
AVPacket packet;
int frameFinished;
int numBytes;
uint8_t *buffer;
...
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==NULL)
return -1;
if(avcodec_open(pCodecCtx, pCodec)<0)
return -1;
pFrame=avcodec_alloc_frame();
pFrameRGB=avcodec_alloc_frame();
if(pFrameRGB==NULL)
return -1;
numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
pCodecCtx->height);
buffer=new uint8_t[numBytes];
avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
pCodecCtx->width, pCodecCtx->height);
while(av_read_frame(pFormatCtx, &packet)>=0)
{
if(packet.stream_index==videoStream)
{
avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
packet.data, packet.size);
if(frameFinished)
{
img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24,
(AVPicture*)pFrame, pCodecCtx->pix_fmt, pCodecCtx->width,
pCodecCtx->height);
for(i=0; i<pFrameRGB->linesize[0]; i++){
if ((i%3)==0){
pFrameRGB->data[0][i] = 50;
}
}
img_convert((AVPicture *)pFrame, pCodecCtx->pix_fmt,
(AVPicture*)pFrameRGB, PIX_FMT_RGB24, pCodecCtx->width,
pCodecCtx->height);
avcodec_encode_video(pCodecCtx,packet.data,packet.size,pFrame);
}
if(av_write_frame(pFormatCtxOut,&packet) < 0){
printf("Error\n");
return -1;
}
}
</code>
The message "Error" doesn´t appear in the standard output...
Can you tell me what is wrong?
Sorry for my english and thanks!!!
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