avcodec_encode_video hangs

[Morion]

I'm using ffmpeg to encode video with x264 encoder. Typically everything works good but sometime it just hangs in avcodec_encode_video and never returns. It usually happens after few minutes of encoding but not each time and I don't see any regularity. Does anyone have an idea what could cause that?

[rogerdpack]

I assume you're using libav? If so I'd ask on libav-user group.
-r