Sound problem on iOS

[JiPaul B.]

Hello everybody,

I've installed VLC on my iPhone 4 with iOS 9.3.5
The first video that I tried, all was OK.
But then for the (allmost) all the next videos I have a sound problem : it goes up and down cyclicly (with a period of about 1/3 of second) and it seems to me that there is a delay between video and sound and this delay increases with time.

All the videos I've tested have been converted from H264 to mp4 on Mac OS X with ffmpeg (allways with the same parameters).
All these videos are OK on VLC for Mac OS X.
If I test again the first video (on my iPhone) it is OK.

What do you think about this problem ?

JiPaul.

[JiPaul B.]

Hello everybody,

Thanks a lot for your answers
Ok I've resolved the problem. Just changing the audio that was previously just copied from the original videos (coming from TNT or Freebox).
It was MPEG Audio layer 1/2 (mp4a) 48000Hz 192kb/s. Now I convert it to MPEG AAC Audio (mp4a) 48000Hz and it works. I thought it was the same. But the former one don't works on VLC for iOS.