diff --git a/ovgenpy/outputs.py b/ovgenpy/outputs.py
index 408fa64..8381094 100644
--- a/ovgenpy/outputs.py
+++ b/ovgenpy/outputs.py
@@ -56,10 +56,17 @@ class _FFmpegCommand:
 
         self.templates += ffmpeg_input_video(ovgen_cfg)  # video
         if ovgen_cfg.master_audio:
-            audio_path = shlex.quote(abspath(ovgen_cfg.master_audio))
+            # Load master audio and trim to timestamps.
+
             self.templates.append(f'-ss {ovgen_cfg.begin_time}')
+
+            audio_path = shlex.quote(abspath(ovgen_cfg.master_audio))
             self.templates += ffmpeg_input_audio(audio_path)    # audio
 
+            if ovgen_cfg.end_time is not None:
+                dur = ovgen_cfg.end_time - ovgen_cfg.begin_time
+                self.templates.append(f'-to {dur}')
+
     def add_output(self, cfg: 'Union[FFmpegOutputConfig, FFplayOutputConfig]') -> None:
         self.templates.append(cfg.video_template)  # video
         if self.ovgen_cfg.master_audio:
diff --git a/ovgenpy/ovgenpy.py b/ovgenpy/ovgenpy.py
index c3f18cc..56484d0 100644
--- a/ovgenpy/ovgenpy.py
+++ b/ovgenpy/ovgenpy.py
@@ -10,7 +10,7 @@ from ovgenpy.channel import Channel, ChannelConfig
 from ovgenpy.config import register_config, register_enum, Ignored
 from ovgenpy.renderer import MatplotlibRenderer, RendererConfig, LayoutConfig
 from ovgenpy.triggers import ITriggerConfig, CorrelationTriggerConfig, Trigger
-from ovgenpy.util import pushd
+from ovgenpy.util import pushd, coalesce
 from ovgenpy.utils import keyword_dataclasses as dc
 from ovgenpy.utils.keyword_dataclasses import field
 from ovgenpy.wave import Wave
@@ -31,11 +31,12 @@ class BenchmarkMode(IntEnum):
     OUTPUT = 3
 
 
-@register_config(always_dump='begin_time subsampling')
+@register_config(always_dump='begin_time end_time subsampling')
 class Config:
     master_audio: Optional[str]
     fps: int
     begin_time: float = 0
+    end_time: float = None
 
     subsampling: int = 1
 
@@ -144,7 +145,7 @@ class Ovgen:
 
         begin_frame = round(fps * self.cfg.begin_time)
 
-        end_frame = fps * self.waves[0].get_s()
+        end_frame = fps * coalesce(self.cfg.end_time, self.waves[0].get_s())
         end_frame = int(end_frame) + 1
 
         renderer = self._load_renderer()