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DVR of transcoder not store

I have original stream and transcoded stream. I want to record DVR both of 2 stream.
With original stream it record normally.
But with transcoded stream, it doesn’t save properly, while the original stream is still saving the dvr, the trandcoder can’t save it, or it saves intermittently, even it only saves the first few seconds and then stops.
Is there any special configuration required for dvr and transcoder?

If it starts recording then stops. First see if the behaviour is consistent every time. If yes look for possible errors in logging etc. what are the properties of the transcoded stream ? How much different are there from original stream ?