decoder: Error out on segments with no keyframe packets #220
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Why?
The video decoder currently gets stuck in an infinite loop while flushing if the input segment does not contain any keyframes, as it uses the first keyframe packet to flush the decoder buffer.
What?
If no keyframe packet is found after reading and sending all packets to the decoder, return an explicit error and don't try to flush.
Testing
Fixes
Fixes #219