Playing video problems - lost of sound

[kalpana]

Hello,
I encountered problems when playing some videos: jumping with the slider to another position causes sound to drop out, i.e. the video plays without sound.
After exploring the properties of these files with ffmpeg, I discovered that one of the parameters had a rather strange value: codec_time_base=10383984/519199199.
Probably this is the cause of problem ?
If yes, how ti fix it ?
Sincerely