mixing
Tools for video and audio editing in Python — slicing, fades, audio replace/mix, Ken Burns, thumbnails, subtitles, speech-to-text + filler removal, TTS dubbing, and chapter detection.
pip install mixing
🤖 AI-first: start with the skills & agents
mixing is built to be driven by AI coding agents. The fastest, most reliable
way to use it is through the bundled skills and agents in
.claude/ — task-oriented playbooks that encode the right
functions, the calling conventions, and the gotchas, so an agent gets it right
the first time.
Skills (.claude/skills/) — how to use mixing for a task:
| Skill | Use it for |
|---|---|
mixing |
Start here — router, architecture, the output protocol, extras |
mixing-audio |
slice, fade, crop, concat, overlay, normalize, align, segment audio |
mixing-video |
slice, crop, loop, speed, replace/normalize audio, Ken Burns, thumbnails, subtitles |
mixing-transcript |
transcribe, remove fillers, SRT/prose, chapters |
mixing-dubbing |
TTS re-voicing & SRT translation |
Agents (.claude/agents/):
mixing-editor— performs an editing task end-to-end ("edit this media …").mixing-dev— works on the mixing codebase.
Using Claude Code? These are discovered automatically from .claude/. The
architectural contract they share lives in .claude/CLAUDE.md.
Quick start
import mixing # cheap: no moviepy/opencv loaded yet
assert mixing.has_ffmpeg() # most ops need ffmpeg on PATH
# --- audio ---
from mixing.audio import Audio
Audio("song.mp3")[10:30].fade_in(2).fade_out(3).save(output="clip.mp3")
# --- video ---
from mixing.video import replace_audio, ken_burns_video
replace_audio("clip.mp4", "music.mp3", mix_ratio=0.7, output="mixed.mp4")
ken_burns_video("cover.jpg", duration=8, output="cover.mp4")
# --- transcript: remove "uh"/"um" (ElevenLabs Scribe + ffmpeg) ---
from mixing.transcript import remove_fillers
result = remove_fillers("talk.mov", "out/") # uses $ELEVENLABS_API_KEY
print(result.cleaned_media)
Core ideas (learn once)
The output protocol. Every result-producing function takes one output
argument whose role is constant and type is open:
crop_video("in.mp4", 5, 15, output="out.mp4") # file → writes it, returns Path
crop_video("in.mp4", 5, 15, output="clips/") # dir → auto-named file inside
crop_video("in.mp4", 5, 15) # None → saves beside the input
fade_in("in.mp3", output=lambda audio: audio) # callable → receives the result
Object producers (audio editing) return the in-memory object when output=None,
so you can chain and save when ready. Functions that emit several artifacts
qualify the destinations (remove_fillers(media, output_dir=…, output_media=…)).
Lazy & tiered. import mixing (and import mixing.chapters /
mixing.srt) pull no heavy backends; moviepy/opencv/pydub load only when you
touch a name that needs them. Import the facade (mixing.Video) or the
subpackage (from mixing.video import Video).
Sliceable media. Audio and Video are lazy, sliceable, context-managed
views:
from mixing.video import Video
with Video("movie.mp4") as v:
v[10:30].save(output="cut.mp4") # seconds; v[100] returns a single frame
Requirements
- ffmpeg on PATH (most operations). macOS:
brew install ffmpeg; Debian/Ubuntu:sudo apt install ffmpeg; Windows: download from ffmpeg.org and addbinto PATH. - ElevenLabs API key for
mixing.transcript/mixing.dubbing(ELEVENLABS_API_KEY, or passapi_key=). Responses are cached on disk, so re-runs are free and offline. - Google Cloud auth for AI video generation
(
mixing.video.genai, Vertex AI Veo).
Optional extras
pip install mixing[audio] # pydub / ffmpeg-python / soundfile
pip install mixing[widget] # interactive Jupyter audio widget
pip install mixing[gen] # Google Vertex AI Veo generation
pip install mixing[llm] # aix — chapter titling + SRT translation
pip install mixing[clipboard] # get file paths from the clipboard
What's inside
| Subpackage | Highlights |
|---|---|
mixing.audio |
Audio, fade_in/out, crop_audio, concatenate_audio, overlay_audio, loop_audio, duck_audio, find_audio_offset, find_segments/extract_segments |
mixing.video |
Video, crop_video, loop_video, change_speed, replace_audio, normalize_audio, overlay_ambient_bed, ken_burns_video/ken_burns_film, concatenate_videos, make_thumbnail, write_subtitles_in_video, SOCIAL_SIZES |
mixing.video.genai |
generate_video (Vertex AI Veo) |
mixing.transcript |
transcribe, remove_fillers, srt_for_media, words_to_srt/words_to_prose |
mixing.chapters |
detect_chapters, Chapter |
mixing.dubbing |
text_to_speech, list_voices, translate_srt, dub_video_from_srt |
mixing.srt |
Cue, parse_srt, dump_srt, seconds_to_srt_time |
See the skills for the full, example-driven API of each.
License
MIT
1 maintainer
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