Tvheadend

Hi,

I recorded an program with tvheadend 3.2.18 use schedule recording. The original length of program was 55 minutes. I tried to play the recorded file and I seen that size of file is cca. 1360 MB but the playable length is 28 minutes. I think that size is (maybe) correct and playable length is false because recorded file size is cca. 1200-1500 MB in same resolution.

What happened? Can I fix it and how?

Thanks
steve