The key script variables you'll want to edit are:
SDIP - the IP address of your SiliconDust device that will be queried with GET and POST commands
MaxEpisodesN - maximum number of episodes to save for a show; older ones are deleted
prunelist - The list of shows you want to prune on your DVR. These are cut/paste from show titles provided by querying the device's StorageURL.
If prunelist is empty, , then all recordings on the SD device will be pruned.
If you just want to see what shows are on your device, set prunelist to an empty string ['']. It will query the device, give you the titles of shows currently on it, and you can cut/paste these as desired into prunelist in the script to prune some shows and not others.
If you want to prune specific shows, put them in prunelist exactly as they appear cut/paste from running with prunelist = [''] (that's two apostrophes, not a single quote) per the example in the code. The list can be as long or short as you like. If you specify shows in prunelist, shows on your SD device not listed in it will be ignored by the pruning. Alternately, you can put all your shows in and just alter the title, e.g., by putting a leading 'x' in it, to keep it from being pruned as a crude way of toggling pruning on or off for a show.
The script uses print() to show what it's doing and its output is verbose so you can see what it does. I have my cron job send that to a log file so I can see what its doing. You can also run it from a command line. It's been working well since bug noted on 12/22 was fixed that day; I just didn't get around to reposting until 1/22.
The pruning algorithm does two things:
First it looks to see if there is more than 1 show recorded. If there is, it will prune the show's episodes so that there is only 1 appearing per day. I have a news program that records under the same title three times a day, so this will leave me with just the most recent episode recorded on any given day.
The next thing it does, after deleting single day duplicates, is eliminate all but the MaxEpisodesN most recent episodes for each show from the DVR.
That's it. There's lots of functionality I may work on next, such as controlling episodes per day and total maximum episodes per show rather than for all shows, but it will be built off of this base.
I think a lot of people are wishing there were a way to specify this in the SD interface directly when setting up recording shows as you can do with other DVRs, e.g., my DirecTV, but until it is available, this is a kludge to use in the meantime.
EDIT 12/22/20 - there is a bug. Number of episodes isn't updated after same day episodes are removed. This causes too many episodes to be pruned if the initial count of episodes, including daily duplicates, was over the number to prune, even if the number of episodes remaining on different days was less than the number to prune after daily duplicates were removed. Fix is simple. Testing now and will replace code below when tested.
EDIT 1/20/21 - bug fixed; updated code inserted below.
Code: Select all
# V1.0 20201221 - original # V1.1 20201222 - Fixed for not updating episode count after calling PruneToOnePerDay() when that call removed some episodes. This # subsequently resulted in the episode count being too high and thus removing too many eiposdes when PruneToNTotal() # was called. # V1.1.1 20201228 - changed program list so some are not pruned by placing # an 'x' in front of program name. Moved the definition of prunelist that is non-destructive to last place so it is default if # script is run without modification by an eager implementer. import urllib.request import urllib.parse import json import time import datetime from operator import itemgetter def postURL(url): # for SiliconDust device, post of URL with no data is required for success # url = urllib.parse.quote(url,encoding='ascii') url = str(url) parameters = b"" print('postURL: ' + url) operURL = urllib.request.urlopen(url, data=parameters) if(operURL.getcode()==200): return 0 else: print('POST url Error',operURL.getcode()) print('failed url:' + cmd) print(operUrl) return -1 return 0 def getURL(url): # print('getURL: ' + str(url)) operUrl = urllib.request.urlopen(url) if(operUrl.getcode()==200): data = operUrl.read() # print(data) # print('==================') jsonData = json.loads(data.decode('utf-8')) else: print("Error retrieving data",operUrl.getcode()) return jsonData def PruneToOnePerDay(RecordedEpisodes): print(' PruneToOnePerDay') # print(RecordedEpisodes) safexit = 100 RecordedEpisodesN = len(RecordedEpisodes) # sort the episodes so they appear most recent to least recent sorted_list = sorted(RecordedEpisodes, key=itemgetter('RecordStartTime'), reverse=True) episode_keep_day = "1970-01-01" for i in range(0, RecordedEpisodesN): # this method has problems with time zone and putting different day recordings on same day # episode_day = int(RecordedEpisodes[i]["RecordStartTime"]/86400 - utcOffsetSec) # fromtimestamp() only works thorugh 2038? episode_day = datetime.datetime.fromtimestamp(RecordedEpisodes[i]["RecordStartTime"]) episode_day = str(episode_day) episode_day = episode_day[0:10] if episode_keep_day != episode_day: episode_keep_day = episode_day # print(" keep day [" + str(episode_day) + "]: " + str(RecordedEpisodes[i]["RecordStartTime"]) # + " -> " # + str(sorted_list[i]["RecordStartTime"]) # + " : " # + str(sorted_list[i]["CmdURL"])) print(" keep day [" + str(episode_day) + "]") else: # print(" delete day [" + str(episode_day) + "]: " + str(RecordedEpisodes[i]["RecordStartTime"]) # + " -> " # + str(sorted_list[i]["RecordStartTime"]) # + " : " # + str(sorted_list[i]["CmdURL"])) print(" delete day [" + str(episode_day) + "]") DelCmdURL = sorted_list[i]["CmdURL"] + '&cmd=delete' postURL(DelCmdURL) return 0 #keep newest N episodes and remove the rest. def PruneToNTotal(N,RecordedEpisodes): print(' PruneToNTotal') RecordedEpisodesN = len(RecordedEpisodes) if RecordedEpisodesN <= N: return 0 else: #create a list sorted from newest to oldest sorted_list = sorted(RecordedEpisodes, key=itemgetter('RecordStartTime'), reverse=True) #delete all excess older shows for i in range(N,RecordedEpisodesN): episode_day = datetime.datetime.fromtimestamp(RecordedEpisodes[i]["RecordStartTime"]) episode_day = str(episode_day) episode_day = episode_day[0:10] print(" delete day [" + str(episode_day) + "]: " + str(RecordedEpisodes[i]["RecordStartTime"]) + " -> " + str(sorted_list[i]["RecordStartTime"]) + " : " + str(sorted_list[i]["CmdURL"])) RecordedEpisodeCmdURL = RecordedEpisodes[i]["CmdURL"] DelCmdURL = RecordedEpisodeCmdURL + '&cmd=delete' postURL(DelCmdURL) return 0 def main(): #configuration variables #IP address of device SDIP = "x.x.x.x" # hard coded prune to N episodes (after one-per-day pruning) MaxEpisodesN = 5 # pick the prunelist definition below that meets your needs and turn off anything you don't want that appears after it (delete or comment out). Last one present wins. # to prune all existing recordings: prunelist =  # To prune list of shows: prunelist = [ 'x60 Minutes', 'CBS News Sunday Morning', 'Channel 2 News', 'NBC Nightly News With Lester Holt', 'PBS NewsHour', 'Survivor', 'The Amazing Race'] # To see shows on your SD device listed in output but not prune anything: prunelist = [''] # ---------------------- begin code # query DVR for its base information urlData = "http://"+SDIP+":80/discover.json" DiscoverData = getURL(urlData) # print(DiscoverData) # print('-------------------') # calculate free space # print(DiscoverData["FreeSpace"]) # print(DiscoverData["TotalSpace"]) pctfree = 100*DiscoverData["FreeSpace"]/DiscoverData["TotalSpace"] print("<=========================================================================>") print("SD DVR prune on [" + SDIP + "] at " + str(datetime.datetime.now())) print('DVR free space: %.1f' % pctfree + '%') print("------") #get base storage URL StorageURL = DiscoverData["StorageURL"] RecordedShows = getURL(StorageURL) #print recorded shows (not episodes) RecordedShowsN = len(RecordedShows) if RecordedShowsN == 0: print ("No recorded shows found.") return 0 print("Recorded shows N=" + str(RecordedShowsN) + ":") for i in range(RecordedShowsN): print(RecordedShows[i]["Title"]) prunelistN = len(prunelist) print("------") # if prunelist is a single empty string, we just want to see recordes shows so exit if prunelistN == 1 and prunelist=='': return 0 # if prunelist is an empty list then populated it with all recorded shows # so all are pruned if prunelistN == 0: for i in range(len(RecordedShows)): prunelist.append(RecordedShows[i]["Title"]) # show the prunelist prunelistN = len(prunelist) print("Prune shows N=" + str(prunelistN) + ":") for i in range(len(prunelist)): print(prunelist[i]) print("======") # begin pruning print("Pruning to " + str(MaxEpisodesN) + " episodes max") for i in range(len(prunelist)): print('prune chk: ' + prunelist[i]) match = False for j in range(len(RecordedShows)): if (RecordedShows[j]["Title"] == prunelist[i]): match = True EpisodesURL = RecordedShows[j]["EpisodesURL"] RecordedEpisodes = getURL(EpisodesURL) RecordedEpisodesN = len(RecordedEpisodes) print(' ' + str(RecordedEpisodesN) + ' episodes found') # Send to one-per-day prune if(RecordedEpisodesN > 1): retval = PruneToOnePerDay(RecordedEpisodes) # Get new eipsode count as some may have been deleted RecordedEpisodes = getURL(EpisodesURL) RecordedEpisodesN = len(RecordedEpisodes) if(RecordedEpisodesN > MaxEpisodesN): # Send to max episodes prune print (' ' + str(RecordedEpisodesN) + ' episodes remain') retval = PruneToNTotal(MaxEpisodesN,RecordedEpisodes) if match == False: print(" 0 episodes found") if __name__ == '__main__': main()