I have a transcoder app which uses libav*. Video comes in via UDP, and I want
to be more robust when the encoding can't keep up with the rate at which video
comes in. So I want to decouple the video demuxing/decoding from the encoding,
using multiple threads: one thread decodes frames, another thread encodes
frames. If another frame comes in while a frame is already waiting to be
encoded, it is dropped. As opposed to just letting UDP randomly drop packets,
which can seriously mess with the video quality.
Unfortunately, a decoded frame is coupled to the decoder codec context: the
codec context owns the frame data. That means it can't continue to decode
frames without clobbering the one I want to save. I need a frame which can
exist independently of any codec context.
So what's the best way to duplicate a frame? The only way I can see is with
swscale, but I don't want to scale it, at least not yet. Just a simple fast
memcpy would do. Is there a function I've overlooked to do this?
Andy
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