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Can a video decoder sample asychronously (not line locked)?

I need to digitise 4 composite videos and TDM them for transport. To TDM them, they need to be of the same clock domain. I do not want to implement a frame synchroniser for each of these videos. My only other alternative is to sample each with the same clock. This means that some or all will be sampled asynchronously, in other words, not line locked. There was a Maxim decoder, the MAX9526, that allowed you to sample asynchronously, and still do comb filtering, BT656 output, etc., but it is being discontinued. Can the Analog Devices decoders be configured to do this?