Shell script to move photos into folders with date YYYYMMDD

I have an IP camera that sends a photo every minute to a folder on a PC (Linux) with (mv *20150501* 20150501).

Where the camera sends the following filename:

Schedule_20150501-103642.jpg

I would like to make a shell script that:

Looks into the file name for the date in the format YYYYMMDD. Create a folder with that number if it doesn't exist and move all files containing this number into this folder.
Checks in each folder if there is an .MP4 file. If not, execute this script that produces a time-lapse video from the images:

mencoder "mf://*.jpg" -mf fps=12:type=jpg -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell:vbitrate=7000 -oac copy -o Zeitraffer`**20150501**.mp4

Base folder is: snap

Sub folder: snap/(date +%YYYY%mm%dd)

Until now, I do all that manually and separately using mv. Then I move into the folders and modify the script for the time lapse. :-(

Until now, I have a script to make at least a bulk of folders by date:

#!/bin/bash

read -p "Geben Sie den ersten Ordner an (JJJJMMTT): " now  
read -p "Geben Sie den letzten Ordner an (JJJJMMTT): " end  

while [ "$now" != "$end" ] ;
do
now=`date +"%Y%m%d" -d "$now +1 day"`;
mkdir $now
done

Any idea?

Solution

First of all, Thanks to every comment of you!!! REGEX is toooo difficult for me. Thanks alyway. After a lot of research today I fit together a lot of puzzle parts. What I got is this: The only thing is that if there is already a folder the respective files are not copied due to the while function. But as the script stops one day before today this should not be a problem. Then I made two more scripts for the case in the past I forgot to make a movie it will be created. The other checks if the MP4 file already exists in the plex folder and if not copy the file there. Actually I just modified the script for that.

The script for "normal" work:

#!/bin/bash
read -p "Geben Sie den ersten Ordner an (JJJJMMTT): " begin  
end=$(date +%Y%m%d -d "-1 day")                                       
 while [ $begin != $end ] 
do
begin=`date +"%Y%m%d" -d "$begin +1 day"`
if [ ! -d $begin ]  # Prüfen, ob es den Ordner gibt.                                      
then
    /bin/mkdir $begin 
    echo "Ordner $begin erstellt"
    mv *$begin*.jpg $begin  
echo "Bilder vom $begin verschoben nach $begin"
 cd $begin  
 $(mencoder mf://*.jpg -mf fps=12:type=jpg -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell:vbitrate=7000 -oac copy -o Zeitraffer$begin.mp4)
  cp Zeitraffer$begin.mp4 /Plexfolder/ 
 echo "Kopiere Zeitraffer$begin.mp4 nach /RAID5/filme/Kamera/"
 cd ..
 fi
 done

The script to check if the MP4 file exists if not creates it and copies to the plex folder:

#!/bin/bash

  read -p "Geben Sie den ersten Ordner an (JJJJMMTT): " begin  
  end=$(date +%Y%m%d -d "-1 day")       
  while [ $begin != $end ] 
  do
  begin=`date +"%Y%m%d" -d "$begin +1 day"`
  if [ -d $begin ] 
  then
  cd $begin 
  if [ ! -f Zeitraffer$begin.mp4 ] #Prüfen, ob es eine MP4 Datei gibt 
  then
  $(mencoder mf://*.jpg -mf fps=12:type=jpg -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell:vbitrate=7000 -oac copy -o Zeitraffer$begin.mp4)
  cp Zeitraffer$begin.mp4 /plexfolder/ 
  echo "Kopiere Zeitraffer$begin.mp4 nach /plexfolder/"
  fi  
  cd ..
  fi
  done

And the one to copy the missing MP4 file to the plex folder:

#!/bin/bash
read -p "Geben Sie den ersten Ordner an (JJJJMMTT): " begin  
end=$(date +%Y%m%d -d "-1 day") 
while [ $begin != $end ] 
do
begin=`date +"%Y%m%d" -d "$begin +1 day"`
if [ -d $begin ]          
then
cd $begin 
if [ ! -f "/plexfolder/Zeitraffer$begin.mp4" ] 
then
cp Zeitraffer$begin.mp4 /RAID5/filme/Kamera/
echo "Kopiere Zeitraffer$begin.mp4 nach /RAID5/filme/Kamera/"
fi  
cd ..
fi
done

And you know what's the best??? IT REALLY WORKS!!! I cannot believe that I did it!!!

Thanks a lot for your help!!!