Understanding of serial variable in ffplay

< H1 > as the title < / H1 >
recently, when I was getting started learning ffmpeg, and watching ffplay.c, I had some doubts about the serial variable. I don"t know if any of the bosses stepped on the pit first.
< H2 > Code < / H2 >

ffplay-3.4.2 source code

< H2 > data searched < / H2 >

explanation on Stackoverflow I don"t understand much

Mar.23,2021

has a little understanding for the time being. I don't know whether it is completely correct

drew a simple picture. Look directly at it.

ffplayserial

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