diff --git a/auto_editor/analyze.py b/auto_editor/analyze.py
index 890ef3225..d0dda3e67 100644
--- a/auto_editor/analyze.py
+++ b/auto_editor/analyze.py
@@ -4,15 +4,16 @@
 import re
 from dataclasses import dataclass
 from fractions import Fraction
+from math import ceil
 from typing import TYPE_CHECKING
 
 import av
 import numpy as np
+from av.audio.fifo import AudioFifo
 from av.subtitles.subtitle import AssSubtitle
 
 from auto_editor import version
 from auto_editor.utils.subtitle_tools import convert_ass_to_text
-from auto_editor.wavfile import read
 
 if TYPE_CHECKING:
     from collections.abc import Iterator
@@ -22,7 +23,6 @@
     from numpy.typing import NDArray
 
     from auto_editor.ffwrapper import FileInfo
-    from auto_editor.output import Ensure
     from auto_editor.utils.bar import Bar
     from auto_editor.utils.log import Log
 
@@ -30,7 +30,6 @@
 @dataclass(slots=True)
 class FileSetup:
     src: FileInfo
-    ensure: Ensure
     strict: bool
     tb: Fraction
     bar: Bar
@@ -89,6 +88,41 @@ def obj_tag(tag: str, tb: Fraction, obj: dict[str, Any]) -> str:
     return key
 
 
+def iter_audio(src, tb: Fraction, stream: int = 0) -> Iterator[float]:
+    fifo = AudioFifo()
+    try:
+        container = av.open(src.path, "r")
+        audio_stream = container.streams.audio[stream]
+        sample_rate = audio_stream.rate
+
+        exact_size = (1 / tb) * sample_rate
+        accumulated_error = 0
+
+        # Resample so that audio data is between [-1, 1]
+        resampler = av.AudioResampler(
+            av.AudioFormat("flt"), audio_stream.layout, sample_rate
+        )
+
+        for frame in container.decode(audio=stream):
+            frame.pts = None  # Skip time checks
+
+            for reframe in resampler.resample(frame):
+                fifo.write(reframe)
+
+            while fifo.samples >= ceil(exact_size):
+                size_with_error = exact_size + accumulated_error
+                current_size = round(size_with_error)
+                accumulated_error = size_with_error - current_size
+
+                audio_chunk = fifo.read(current_size)
+                assert audio_chunk is not None
+                arr = audio_chunk.to_ndarray().flatten()
+                yield float(np.max(np.abs(arr)))
+
+    finally:
+        container.close()
+
+
 def iter_motion(src, tb, stream: int, blur: int, width: int) -> Iterator[float]:
     container = av.open(src.path, "r")
 
@@ -138,7 +172,6 @@ def iter_motion(src, tb, stream: int, blur: int, width: int) -> Iterator[float]:
 
 @dataclass(slots=True)
 class Levels:
-    ensure: Ensure
     src: FileInfo
     tb: Fraction
     bar: Bar
@@ -151,24 +184,16 @@ def media_length(self) -> int:
             if (arr := self.read_cache("audio", {"stream": 0})) is not None:
                 return len(arr)
 
-            sr, samples = read(self.ensure.audio(self.src, 0))
-            samp_count = len(samples)
-            del samples
-
-            samp_per_ticks = sr / self.tb
-            ticks = int(samp_count / samp_per_ticks)
-            self.log.debug(f"Audio Length: {ticks}")
-            self.log.debug(
-                f"... without rounding: {float(samp_count / samp_per_ticks)}"
-            )
-            return ticks
+            result = sum(1 for _ in iter_audio(self.src, self.tb, 0))
+            self.log.debug(f"Audio Length: {result}")
+            return result
 
         # If there's no audio, get length in video metadata.
-        with av.open(f"{self.src.path}") as cn:
-            if len(cn.streams.video) < 1:
+        with av.open(self.src.path) as container:
+            if len(container.streams.video) == 0:
                 self.log.error("Could not get media duration")
 
-            video = cn.streams.video[0]
+            video = container.streams.video[0]
 
             if video.duration is None or video.time_base is None:
                 dur = 0
@@ -213,56 +238,70 @@ def cache(self, tag: str, obj: dict[str, Any], arr: np.ndarray) -> np.ndarray:
         return arr
 
     def audio(self, stream: int) -> NDArray[np.float64]:
-        if stream > len(self.src.audios) - 1:
+        if stream >= len(self.src.audios):
             raise LevelError(f"audio: audio stream '{stream}' does not exist.")
 
         if (arr := self.read_cache("audio", {"stream": stream})) is not None:
             return arr
 
-        sr, samples = read(self.ensure.audio(self.src, stream))
-
-        if len(samples) == 0:
-            raise LevelError(f"audio: stream '{stream}' has no samples.")
-
-        def get_max_volume(s: np.ndarray) -> float:
-            return max(float(np.max(s)), -float(np.min(s)))
-
-        max_volume = get_max_volume(samples)
-        self.log.debug(f"Max volume: {max_volume}")
+        with av.open(self.src.path, "r") as container:
+            audio = container.streams.audio[stream]
+            if audio.duration is not None and audio.time_base is not None:
+                inaccurate_dur = int(audio.duration * audio.time_base * self.tb)
+            elif container.duration is not None:
+                inaccurate_dur = int(container.duration / av.time_base * self.tb)
+            else:
+                inaccurate_dur = 1024
 
-        samp_count = samples.shape[0]
-        samp_per_ticks = sr / self.tb
+        bar = self.bar
+        bar.start(inaccurate_dur, "Analyzing audio volume")
 
-        if samp_per_ticks < 1:
-            self.log.error(
-                f"audio: stream '{stream}'\n  Samplerate ({sr}) must be greater than "
-                f"or equal to timebase ({self.tb})\n"
-                "  Try `-fps 30` and/or `--sample-rate 48000`"
-            )
+        result = np.zeros((inaccurate_dur), dtype=np.float64)
+        index = 0
+        for value in iter_audio(self.src, self.tb, stream):
+            if index > len(result) - 1:
+                result = np.concatenate(
+                    (result, np.zeros((len(result)), dtype=np.float64))
+                )
+            result[index] = value
+            bar.tick(index)
+            index += 1
 
-        audio_ticks = int(samp_count / samp_per_ticks)
-        self.log.debug(
-            f"analyze: audio length: {audio_ticks} ({float(samp_count / samp_per_ticks)})"
-        )
-        self.bar.start(audio_ticks, "Analyzing audio volume")
+        bar.end()
+        return self.cache("audio", {"stream": stream}, result[:index])
 
-        threshold_list = np.zeros((audio_ticks), dtype=np.float64)
+    def motion(self, stream: int, blur: int, width: int) -> NDArray[np.float64]:
+        if stream >= len(self.src.videos):
+            raise LevelError(f"motion: video stream '{stream}' does not exist.")
 
-        if max_volume == 0:  # Prevent dividing by zero
-            return threshold_list
+        mobj = {"stream": stream, "width": width, "blur": blur}
+        if (arr := self.read_cache("motion", mobj)) is not None:
+            return arr
 
-        # Determine when audio is silent or loud.
-        for i in range(audio_ticks):
-            if i % 500 == 0:
-                self.bar.tick(i)
+        with av.open(self.src.path, "r") as container:
+            video = container.streams.video[stream]
+            inaccurate_dur = (
+                1024
+                if video.duration is None or video.time_base is None
+                else int(video.duration * video.time_base * self.tb)
+            )
 
-            start = int(i * samp_per_ticks)
-            end = min(int((i + 1) * samp_per_ticks), samp_count)
+        bar = self.bar
+        bar.start(inaccurate_dur, "Analyzing motion")
 
-            threshold_list[i] = get_max_volume(samples[start:end]) / max_volume
+        result = np.zeros((inaccurate_dur), dtype=np.float64)
+        index = 0
+        for value in iter_motion(self.src, self.tb, stream, blur, width):
+            if index > len(result) - 1:
+                result = np.concatenate(
+                    (result, np.zeros((len(result)), dtype=np.float64))
+                )
+            result[index] = value
+            bar.tick(index)
+            index += 1
 
-        self.bar.end()
-        return self.cache("audio", {"stream": stream}, threshold_list)
+        bar.end()
+        return self.cache("motion", mobj, result[:index])
 
     def subtitle(
         self,
@@ -336,37 +375,3 @@ def subtitle(
         container.close()
 
         return result
-
-    def motion(self, stream: int, blur: int, width: int) -> NDArray[np.float64]:
-        if stream >= len(self.src.videos):
-            raise LevelError(f"motion: video stream '{stream}' does not exist.")
-
-        mobj = {"stream": stream, "width": width, "blur": blur}
-        if (arr := self.read_cache("motion", mobj)) is not None:
-            return arr
-
-        with av.open(self.src.path, "r") as container:
-            video = container.streams.video[stream]
-            inaccurate_dur = (
-                1024
-                if video.duration is None or video.time_base is None
-                else int(video.duration * video.time_base * self.tb)
-            )
-
-        bar = self.bar
-        bar.start(inaccurate_dur, "Analyzing motion")
-
-        threshold_list = np.zeros((inaccurate_dur), dtype=np.float64)
-        index = 0
-
-        for value in iter_motion(self.src, self.tb, stream, blur, width):
-            if index > len(threshold_list) - 1:
-                threshold_list = np.concatenate(
-                    (threshold_list, np.zeros((len(threshold_list)), dtype=np.float64))
-                )
-            threshold_list[index] = value
-            bar.tick(index)
-            index += 1
-
-        bar.end()
-        return self.cache("motion", mobj, threshold_list[:index])
diff --git a/auto_editor/edit.py b/auto_editor/edit.py
index f8d976f3c..e7723465e 100644
--- a/auto_editor/edit.py
+++ b/auto_editor/edit.py
@@ -202,10 +202,8 @@ def edit_media(
     else:
         samplerate = args.sample_rate
 
-    ensure = Ensure(ffmpeg, bar, samplerate, temp, log)
-
     if tl is None:
-        tl = make_timeline(sources, ensure, args, samplerate, bar, temp, log)
+        tl = make_timeline(sources, args, samplerate, bar, temp, log)
 
     if export["export"] == "timeline":
         from auto_editor.formats.json import make_json_timeline
@@ -216,7 +214,7 @@ def edit_media(
     if args.preview:
         from auto_editor.preview import preview
 
-        preview(ensure, tl, temp, log)
+        preview(tl, temp, log)
         return
 
     if export["export"] == "json":
@@ -265,6 +263,8 @@ def make_media(tl: v3, output: str) -> None:
         sub_output = []
         apply_later = False
 
+        ensure = Ensure(ffmpeg, bar, samplerate, temp, log)
+
         if ctr.default_sub != "none" and not args.sn:
             sub_output = make_new_subtitles(tl, ensure, temp)
 
diff --git a/auto_editor/make_layers.py b/auto_editor/make_layers.py
index 0ca6f0419..ed0c51fb9 100644
--- a/auto_editor/make_layers.py
+++ b/auto_editor/make_layers.py
@@ -18,7 +18,6 @@
 if TYPE_CHECKING:
     from numpy.typing import NDArray
 
-    from auto_editor.output import Ensure
     from auto_editor.utils.bar import Bar
     from auto_editor.utils.chunks import Chunks
     from auto_editor.utils.log import Log
@@ -75,7 +74,6 @@ def make_av(src: FileInfo, all_clips: list[list[Clip]]) -> tuple[VSpace, ASpace]
 def run_interpreter_for_edit_option(
     text: str, filesetup: FileSetup
 ) -> NDArray[np.bool_]:
-    ensure = filesetup.ensure
     src = filesetup.src
     tb = filesetup.tb
     bar = filesetup.bar
@@ -87,8 +85,8 @@ def run_interpreter_for_edit_option(
         if log.is_debug:
             log.debug(f"edit: {parser}")
 
-        env["timebase"] = filesetup.tb
-        env["@levels"] = Levels(ensure, src, tb, bar, temp, log)
+        env["timebase"] = tb
+        env["@levels"] = Levels(src, tb, bar, temp, log)
         env["@filesetup"] = filesetup
 
         results = interpret(env, parser)
@@ -139,7 +137,6 @@ def parse_time(val: str, arr: NDArray, tb: Fraction) -> int:  # raises: `CoerceE
 
 def make_timeline(
     sources: list[FileInfo],
-    ensure: Ensure,
     args: Args,
     sr: int,
     bar: Bar,
@@ -169,7 +166,7 @@ def make_timeline(
     concat = np.concatenate
 
     for i, src in enumerate(sources):
-        filesetup = FileSetup(src, ensure, len(sources) < 2, tb, bar, temp, log)
+        filesetup = FileSetup(src, len(sources) < 2, tb, bar, temp, log)
 
         edit_result = run_interpreter_for_edit_option(method, filesetup)
         mut_margin(edit_result, start_margin, end_margin)
diff --git a/auto_editor/preview.py b/auto_editor/preview.py
index 7b922a39e..56613ffaf 100644
--- a/auto_editor/preview.py
+++ b/auto_editor/preview.py
@@ -6,7 +6,6 @@
 from typing import TextIO
 
 from auto_editor.analyze import Levels
-from auto_editor.output import Ensure
 from auto_editor.timeline import v3
 from auto_editor.utils.bar import Bar
 from auto_editor.utils.func import to_timecode
@@ -49,7 +48,7 @@ def all_cuts(tl: v3, in_len: int) -> list[int]:
     return cut_lens
 
 
-def preview(ensure: Ensure, tl: v3, temp: str, log: Log) -> None:
+def preview(tl: v3, temp: str, log: Log) -> None:
     log.conwrite("")
     tb = tl.tb
 
@@ -66,7 +65,7 @@ def preview(ensure: Ensure, tl: v3, temp: str, log: Log) -> None:
 
     in_len = 0
     for src in all_sources:
-        in_len += Levels(ensure, src, tb, Bar("none"), temp, log).media_length
+        in_len += Levels(src, tb, Bar("none"), temp, log).media_length
 
     out_len = tl.out_len()
 
diff --git a/auto_editor/render/subtitle.py b/auto_editor/render/subtitle.py
index f84fa860c..33ecc7034 100644
--- a/auto_editor/render/subtitle.py
+++ b/auto_editor/render/subtitle.py
@@ -49,7 +49,7 @@ def parse(self, text: str, codec: str) -> None:
         self.codec = codec
         self.contents = []
 
-        if codec == "ass":
+        if codec == "ass" or codec == "ssa":
             time_code = re.compile(r"(.*)(\d+:\d+:[\d.]+)(.*)(\d+:\d+:[\d.]+)(.*)")
         elif codec == "webvtt":
             time_code = re.compile(r"()(\d+:[\d.]+)( --> )(\d+:[\d.]+)(\n.*)")
diff --git a/auto_editor/subcommands/levels.py b/auto_editor/subcommands/levels.py
index dfcd1ec81..44514c87d 100644
--- a/auto_editor/subcommands/levels.py
+++ b/auto_editor/subcommands/levels.py
@@ -1,20 +1,16 @@
 from __future__ import annotations
 
-import math
 import sys
 from dataclasses import dataclass, field
 from fractions import Fraction
 from typing import TYPE_CHECKING
 
-import av
 import numpy as np
-from av.audio.fifo import AudioFifo
 
-from auto_editor.analyze import LevelError, Levels, iter_motion
-from auto_editor.ffwrapper import FFmpeg, initFileInfo
+from auto_editor.analyze import LevelError, Levels, iter_audio, iter_motion
+from auto_editor.ffwrapper import initFileInfo
 from auto_editor.lang.palet import env
 from auto_editor.lib.contracts import is_bool, is_nat, is_nat1, is_str, is_void, orc
-from auto_editor.output import Ensure
 from auto_editor.utils.bar import Bar
 from auto_editor.utils.cmdkw import (
     ParserError,
@@ -40,8 +36,6 @@ class LevelArgs:
     input: list[str] = field(default_factory=list)
     edit: str = "audio"
     timebase: Fraction | None = None
-    ffmpeg_location: str | None = None
-    my_ffmpeg: bool = False
     help: bool = False
 
 
@@ -59,12 +53,6 @@ def levels_options(parser: ArgumentParser) -> ArgumentParser:
         type=frame_rate,
         help="Set custom timebase",
     )
-    parser.add_argument("--ffmpeg-location", help="Point to your custom ffmpeg file")
-    parser.add_argument(
-        "--my-ffmpeg",
-        flag=True,
-        help="Use the ffmpeg on your PATH instead of the one packaged",
-    )
     return parser
 
 
@@ -95,47 +83,10 @@ def print_arr_gen(arr: Iterator[int | float]) -> None:
     print("")
 
 
-def iter_audio(src, tb: Fraction, stream: int = 0) -> Iterator[float]:
-    fifo = AudioFifo()
-    try:
-        container = av.open(src.path, "r")
-        audio_stream = container.streams.audio[stream]
-        sample_rate = audio_stream.rate
-
-        exact_size = (1 / tb) * sample_rate
-        accumulated_error = 0
-
-        # Resample so that audio data is between [-1, 1]
-        resampler = av.AudioResampler(
-            av.AudioFormat("flt"), audio_stream.layout, sample_rate
-        )
-
-        for frame in container.decode(audio=stream):
-            frame.pts = None  # Skip time checks
-
-            for reframe in resampler.resample(frame):
-                fifo.write(reframe)
-
-            while fifo.samples >= math.ceil(exact_size):
-                size_with_error = exact_size + accumulated_error
-                current_size = round(size_with_error)
-                accumulated_error = size_with_error - current_size
-
-                audio_chunk = fifo.read(current_size)
-                assert audio_chunk is not None
-                arr = audio_chunk.to_ndarray().flatten()
-                yield float(np.max(np.abs(arr)))
-
-    finally:
-        container.close()
-
-
 def main(sys_args: list[str] = sys.argv[1:]) -> None:
     parser = levels_options(ArgumentParser("levels"))
     args = parser.parse_args(LevelArgs, sys_args)
 
-    ffmpeg = FFmpeg(args.ffmpeg_location, args.my_ffmpeg)
-
     bar = Bar("none")
     temp = setup_tempdir(None, Log())
     log = Log(quiet=True, temp=temp)
@@ -147,7 +98,6 @@ def main(sys_args: list[str] = sys.argv[1:]) -> None:
     src = sources[0]
 
     tb = src.get_fps() if args.timebase is None else args.timebase
-    ensure = Ensure(ffmpeg, bar, src.get_sr(), temp, log)
 
     if ":" in args.edit:
         method, attrs = args.edit.split(":", 1)
@@ -182,7 +132,7 @@ def main(sys_args: list[str] = sys.argv[1:]) -> None:
             except ParserError as e:
                 log.error(e)
 
-        levels = Levels(ensure, src, tb, bar, temp, log)
+        levels = Levels(src, tb, bar, temp, log)
         try:
             if method == "audio":
                 print_arr_gen(iter_audio(src, tb, **obj))
diff --git a/auto_editor/subcommands/repl.py b/auto_editor/subcommands/repl.py
index 2423cbb56..6db2d2506 100644
--- a/auto_editor/subcommands/repl.py
+++ b/auto_editor/subcommands/repl.py
@@ -6,11 +6,10 @@
 
 import auto_editor
 from auto_editor.analyze import FileSetup, Levels
-from auto_editor.ffwrapper import FFmpeg, initFileInfo
+from auto_editor.ffwrapper import initFileInfo
 from auto_editor.lang.palet import ClosingError, Lexer, Parser, env, interpret
 from auto_editor.lib.data_structs import print_str
 from auto_editor.lib.err import MyError
-from auto_editor.output import Ensure
 from auto_editor.utils.bar import Bar
 from auto_editor.utils.func import setup_tempdir
 from auto_editor.utils.log import Log
@@ -48,12 +47,6 @@ def repl_options(parser: ArgumentParser) -> ArgumentParser:
         type=frame_rate,
         help="Set custom timebase",
     )
-    parser.add_argument("--ffmpeg-location", help="Point to your custom ffmpeg file")
-    parser.add_argument(
-        "--my-ffmpeg",
-        flag=True,
-        help="Use the ffmpeg on your PATH instead of the one packaged",
-    )
     parser.add_argument(
         "--temp-dir",
         metavar="PATH",
@@ -68,16 +61,14 @@ def main(sys_args: list[str] = sys.argv[1:]) -> None:
     if args.input:
         temp = setup_tempdir(args.temp_dir, Log())
         log = Log(quiet=True, temp=temp)
-        ffmpeg = FFmpeg(args.ffmpeg_location, args.my_ffmpeg, False)
         strict = len(args.input) < 2
         sources = [initFileInfo(path, log) for path in args.input]
         src = sources[0]
         tb = src.get_fps() if args.timebase is None else args.timebase
         bar = Bar("modern")
-        ensure = Ensure(ffmpeg, bar, src.get_sr(), temp, log)
         env["timebase"] = tb
-        env["@levels"] = Levels(ensure, src, tb, bar, temp, log)
-        env["@filesetup"] = FileSetup(src, ensure, strict, tb, bar, temp, log)
+        env["@levels"] = Levels(src, tb, bar, temp, log)
+        env["@filesetup"] = FileSetup(src, strict, tb, bar, temp, log)
 
     print(f"Auto-Editor {auto_editor.version} ({auto_editor.__version__})")
     text = None