Bandersnatch Maker ================== This is a program I wrote on a live stream on the 14th (and 15th) of June 2019. https://www.twitch.tv/videos/438871676 You'll need some things. * The movie (complete, with all clips, should be 05:12:14). See https://mehotkhan.github.io/BandersnatchInteractive/ for info on that. * Some data from BandersnatchInteractive. * https://mehotkhan.github.io/BandersnatchInteractive/assets/bandersnatch.js * https://mehotkhan.github.io/BandersnatchInteractive/assets/SegmentMap.js * ffmpeg You'll need to edit the two js files to remove `bandersnatch=` and `SegmentMap=` respectively so they parse as valid json. If you encounter an error about utf-8 bom use dos2unix to fix it. Rename the files to `bandersnatch.json` and `SegmentMap.json`. Open a python interpreter in the same directory as SegmentMap.js. I'd probably recommend 3.7. Paste this in: ```python import json with open("SegmentMap.json") as f: smap = json.load(f) def msToTS(ms): s,ms = divmod(ms,1000) m,s = divmod(s,60) h,m = divmod(m,60) return "{:02d}:{:02d}:{:02d}.{:03d}".format(h,m,s,ms) for segment in smap.values(): ss = "" t = "" # working around ffmpeg seek to previous keyframe if segment["startTimeMs"] > 5000: # 40ms subtracted to account for one frame difference in 25fps source video ss = " -ss " + msToTS(segment["startTimeMs"]-4960) if "endTimeMs" in segment: t = " -t {}".format((segment["endTimeMs"]-segment["startTimeMs"])/1000) print("""ffmpeg{} -i bandersnatch.mkv -ss 5{} {}.mkv 2>/dev/null""".format(ss, t, segment)) ``` You'll get a bunch of lines to run to generate clips from the full movie. I'd suggest putting these lines into a bash script and leaving it to run for a while in screen or tmux. This will take a very long time dependent on your CPU. While that's going, generate some movies! ```bash $ python bandersnatch.py > concat.txt picked 1A out=['1E'] out=['1D'] poss=['1E', '1D'] picked 1D out=['1H'] out=['1G'] poss=['1H', '1G'] picked 1G ... out=['8JA'] out=['8JB1'] poss=['8JA', '8JB1'] picked 8JA out=['0Cr4', '0cr3'] out=['0Cr4', '0cr3'] poss=['0Cr4', '0cr3'] picked 0Cr4 and added IDNT 01:04:02.610 ``` The stderr output displays what choices were possible at each stage, which segment it picked, and the total length of the movie. The output file concat.txt is produced in ffmpeg concat format, render it in the same directory as the segment files (e.g IDNT.mkv) with: ```bash ffmpeg -f concat -i concat.txt -c copy `date +%Y%m%d-%H%M%S.mkv` ```

from random import choice import json from sys import stderr with open("bandersnatch.json") as f: bandersnatch = json.load(f) with open("/srv/http/bi/assets/segmentmap.json") as f: smap = json.load(f) initial_state = { "p_sp": True, "p_tt": True, "p_8a": False, "p_td": True, "p_cs": False, "p_w1": False, "p_2b": False, "p_3j": False, "p_pt": False, "p_cd": False, "p_cj": False, "p_sj": False, "p_sj2": False, "p_tud": False, "p_lsd": False, "p_vh": False, "p_3l": False, "p_3s": False, "p_3z": False, "p_ps": "n", "p_wb": False, "p_kd": False, "p_bo": False, "p_5v": False, "p_pc": "n", "p_sc": False, "p_ty": False, "p_cm": False, "p_pr": False, "p_3ad": False, "p_s3af": False, "p_nf": False, "p_np": False, "p_ne": False, "p_pp": False, "p_tp": False, "p_bup": False, "p_be": False, "p_pe": False, "p_pae": False, "p_te": False, "p_snt": False, "p_8j": False, "p_8d": False, "p_8m": False, "p_8q": False, "p_8s": False, "p_8v": False, "p_vs": "n", "p_scs": False, "p_3ab": False, "p_3ac": False, "p_3aj": False, "p_3ah": False, "p_3ak": False, "p_3al": False, "p_3af": False, "p_5h": False, "p_5ac": False, "p_5ag": False, "p_5ad": False, "p_6c": False, "length": 0 } state = dict(initial_state) moments = bandersnatch["videos"]["80988062"]["interactiveVideoMoments"]["value"]["momentsBySegment"] preconditions = bandersnatch["videos"]["80988062"]["interactiveVideoMoments"]["value"]["preconditions"] segmentGroups = bandersnatch["videos"]["80988062"]["interactiveVideoMoments"]["value"]["segmentGroups"] def msToTS(ms): s,ms = divmod(ms,1000) m,s = divmod(s,60) h,m = divmod(m,60) return "{:02d}:{:02d}:{:02d}.{:03d}".format(h,m,s,ms) def conditionHandler(cond): global state if not cond: return True if cond[0] == "persistentState": return state[cond[1]] if cond[0] == "not": return not all(conditionHandler(c) for c in cond[1:]) if cond[0] == "and": return all(conditionHandler(c) for c in cond[1:]) if cond[0] == "eql": return conditionHandler(cond[1]) == cond[2] if cond[0] == "or": return any(conditionHandler(c) for c in cond[1:]) def groupHandler(group, segment=None): out = [] if segment: group.append(segment) for item in group: if type(item) is str and conditionHandler( preconditions.get(item,[]) ): out.append(item) if type(item) is dict: if "segmentGroup" in item: out += groupHandler(segmentGroups[item["segmentGroup"]]) if "precondition" in item: if conditionHandler( preconditions.get(item["precondition"],[]) ): out.append(item["segment"]) print("out="+repr(out),file=stderr) return out def followTheStory(segment): global state global history possibilities = [] if segment in moments: m = moments[segment] for moment in m: if moment["type"] == "notification:playbackImpression": state.update( moment.get("impressionData",{}).get("data", {}).get("persistent", {}) ) if moment["type"] == "scene:cs_bs": for option in moment["choices"]: state.update( option.get("impressionData",{}).get("data", {}).get("persistent", {}) ) if "segmentId" in option: p = groupHandler([option["segmentId"]]) elif "sg" in option: p = groupHandler(segmentGroups[option["sg"]]) elif moment["trackingInfo"]["optionType"] == "fakeOption": continue else: raise Exception(option["id"]) possibilities += p if moment["type"] == "notification:action": possibilities.append(segment) if segment in segmentGroups: possibilities += groupHandler(segmentGroups[segment]) print("poss="+repr(possibilities),file=stderr) if not possibilities: # raise Exception("hoi") possibilities += groupHandler(segmentGroups["respawnOptions"]) return choice(possibilities) def bandersnatch(): global state state = dict(initial_state) current_segment = "1A" while True: state["length"] += smap[current_segment]["endTimeMs"] - smap[current_segment]["startTimeMs"] if current_segment[:3].lower() == "0cr": print("file '{}.mkv'".format(current_segment)) print("file 'IDNT.mkv'") print("picked {} and added IDNT".format(current_segment), file=stderr) state["length"] += 10 break print("file '{}.mkv'".format(current_segment)) print("picked {}".format(current_segment), file=stderr) current_segment = followTheStory(current_segment) if current_segment is None: break return msToTS(state["length"]) if __name__ == "__main__": print(bandersnatch(),file=stderr)