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

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e9517b-152f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e9517b-152f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?