Hi.
I checked the approach with FFMPEG, and it seems to extract the frames to
images just fine.
This is the loop that does the work in my case (adopted from tutorial by
D.Ranger):
int frameFinished;
AVPacket packet;
av_seek(...);//Jump to keyframe BEFORE the required time
i=0;
while(av_read_frame(pFormatCtx, &packet)>=0) {
// Is this a packet from the video stream?
if(packet.stream_index==videoStream) {
// Decode video frame
avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
packet.data, packet.size);
// Did we get a video frame?
if(frameFinished) {
// Convert the image from its native format to RGB
img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24,
(AVPicture*)pFrame, pCodecCtx->pix_fmt,
pCodecCtx->width, pCodecCtx->height);
// Save the frame to disk
if(++i<=5)
SaveFrame(pFrameRGB, pCodecCtx->width,
pCodecCtx->height, i);
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
For some reason this approach produces images filled with gray color,
instead of having clear image in them. Any idea why this happens?
Regards.
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