Record real time with ffmpeg?

[piratilla_bcn]

Hi,

I'm trying to record some TV news station. I'm creating IPTV through DVB capture card from the TV.

I've found that even the stream works when I record the file, it's not the exact time, I mean:

I know that sometimes from the receiving the signal, it can delay between 2 and 10 seconds, but when I try to accurate, I found that ffmpeg delays 3-4 seconds to start recording.

If the TV news show 14:00:00 or with DVB Snoop I check the time at 14:00:00, my recording starts at 14:00:03 or 14:00:04.

I'm doing this test:

ffmpeg -y -i udp://@239.255.7.3:1234 -r 25 -vcodec libx264 -acodec libfdk_aac -ab 48000 -ar 22050 -ac 1 -s 352x288 -f segment -strftime 1 -segment_time 300 -segment_format mp4 /var/tmp/test-Tvnews-%Y%m%d_%H%M%S.mp4

Anyone can help?

Thanks! :-)