FFmpeg jump to most recent frame - objective-c

Question

I am looking for some help with dropping/skipping FFmpeg frames. The project I am working on streams live video which when the app goes into the background, upon returning to an active state the video stream spends a long time catching up by fast forwarding itself to the current frame. This isn't ideal and what I am aiming to achieve is have the app immediately jump to the most recent frame.
What I need to do is drop the amount of frames that are being fast-forwarded in order to catch up to the most recent frame. Is this possible? Here is my current code which decodes the frames:
- (NSArray *) decodeFrames: (CGFloat) minDuration
{
NSMutableArray *result = [NSMutableArray array];
#synchronized (lock) {
if([_reading integerValue] != 1){
_reading = [NSNumber numberWithInt:1];
#synchronized (_seekPosition) {
if([_seekPosition integerValue] != -1 && _seekPosition){
[self seekDecoder:[_seekPosition longLongValue]];
_seekPosition = [NSNumber numberWithInt:-1];
}
}
if (_videoStream == -1 &&
_audioStream == -1)
return nil;
AVPacket packet;
CGFloat decodedDuration = 0;
CGFloat totalDuration = [TimeHelper calculateTimeDifference];
do {
BOOL finished = NO;
int count = 0;
while (!finished) {
if (av_read_frame(_formatCtx, &packet) < 0) {
_isEOF = YES;
[self endOfFileReached];
break;
}
[self frameRead];
if (packet.stream_index ==_videoStream) {
int pktSize = packet.size;
while (pktSize > 0) {
int gotframe = 0;
int len = avcodec_decode_video2(_videoCodecCtx,
_videoFrame,
&gotframe,
&packet);
if (len < 0) {
LoggerVideo(0, #"decode video error, skip packet");
break;
}
if (gotframe) {
if (!_disableDeinterlacing &&
_videoFrame->interlaced_frame) {
avpicture_deinterlace((AVPicture*)_videoFrame,
(AVPicture*)_videoFrame,
_videoCodecCtx->pix_fmt,
_videoCodecCtx->width,
_videoCodecCtx->height);
}
KxVideoFrame *frame = [self handleVideoFrame];
if (frame) {
[result addObject:frame];
_position = frame.position;
decodedDuration += frame.duration;
if (decodedDuration > minDuration)
finished = YES;
}
} else {
count++;
}
if (0 == len)
break;
pktSize -= len;
}
}
av_free_packet(&packet);
}
} while (totalDuration > 0);
_reading = [NSNumber numberWithInt:0];
return result;
}
}
return result;