AI face-to-face fortune teller chat experiment.
- Supports multiple characters defined solely by portrait image and voice selection.
- Minimal web application front-end, REST back end
- LLM integration for reasonable fortune teller interaction text, implementations:
- Text To Speech (TTS) integration with ElevenLabs and MacOS native speech synthesis.
- Lip sync animated video generation from single portrait image and speech audio with sadtalker (open source) CURRENTLY WAY TOO SLOW running either on 1x H100 at fal.ai or MacOS running 64Gb M1 Max Apple Silicon.
- Client-side face and pose estimation to:
- Detect user approach to camera
- (WIP) analyse self-portrait for lipsync suitability i.e. dimensions, framing
- Postgres database for storing and tracing all interactions and intermediate media assets.
- Video capture is in progress
- client-side object detection and pose estimation is used to detect approaching users
- Fortune teller self-portrait is mapped for facial landmarks to enable scaling and reframing portraits to be better suited for lipync video generation. These portraits will be uploadable or integrated with gen-ai at some point.
- Audio input streaming is not currently implemented, nor is Speech To Text (STT), vision via image-to-text.
- The user can currently type text into a chat-like text box and the conversation history is shown in the UI.
- Basic system admin panel is revealed by clicking a subtle sprocket icon near the top left corner of the main view.
- Desktop Chrome is the only browser currently used in testing. Mobile browsers are kept in mind and might even mostly work.
At this proof-of-concept stage, the project is a feasibility study to see how a face-to-face video chat can be assembled using various AI models. Components can be swapped for alternatives which is especially useful for quality and performance testing.
This application is proving to be a usable tech demo but equally likely may be abandoned if heavy engineering or custom model training is required to make it fun to use.
The prototype scenario is a fortune teller character, envisioned to be a physical interactive installation, decorated like a fortune teller's booth or tent. The key hardware is focused on a computer with a webcam or potentially any device capable of doing a video call.
The idea is that punters come to interact with the fortune teller in a natural conversation workflow, typical of a fortune-teller. Depending on the details this could include any such services: clairvoyant, astrologer, tarot reader etc.
The fortune teller character is entirely automatic, built from components relying on available machine learning models and online services. A fully-offline option is a stretch goal although it seems likely to require unjustified additional engineering and an unfortunate quality compromise.
While there are several design choices that are tuned for something like the fortune teller character, systems and configuration are expected to work the same for a very different character scenario. Most product engineering engaged with this feature set is focused on customer service use cases and pumping out endless explainer videos. I'm not that guy. At the moment animals or cartoon characters are out of scope since lipsync video models currently under consideration were not trained on these faces and the result is a blurry mess. A simpler, traditional animation framework may be more suitable for animating these. Semi-realistic painterly human portraits do work OK.
The documents here are a bit disorganised and quite verbose. See also:
It is hoped that this system can operate without a traditional human-operated media production toolchain or pipeline. No video shooting or editing. So far all media assets are driven by code and AI prompts. Adding video production, illustration or any other kind of media editing may offer quality benefits or potential time or money savings. Nevertheless, exclusively constraining all human development-time input to text from a keyboard makes for an interesting exploration and at the moment is adopted as a defining feature of this research project.
Non-verbal portrait animation is apparently achievable by using reference video. This would violate the above design constraint. Maybe this video could be captured from user input - maybe even system-operator user input? Given that user video capture is intended for core functionality, it may be interesting to provide gesture demonstration input as a design-time feature. Character design could be more independent of system code.
The first thing a user sees when interacting with the system is a portrait of a fortune teller. Various text-to-image generative systems have been used to create make these characters at design time although in theory, this could be created on demand. In a full realisation of such a system, the character may be gently animated in a suitable waiting state like a meditative trance.
Various design alternatives include making the installation like a portal or magic mirror through which the character could be summoned akin to a kind of cosmic zoom call.
Suitable character portraits seem to have the following features:
- Portrait aspect ratio is the focus of testing and design but landscape should probably work just fine.
- Proportion of the frame that is occupied by the head is between 10% and 30% of the shortest edge of the image.
- Background of head is relatively uniform. Any detail here may be subject to warping or tearing.
- No foreground objects or obstructions should be near the head or face. Otherwise they will be warped.
- Body position ideally should look natural if held still indefinitely. Having the character's hands on a crystal ball or be hidden somehow makes the anticipated absence of hand gestures less conspicuous.
- Face lighting and colour should be most like the training data. Face paint, extreme wrinkles, exaggerated features, excessive shadows or extreme postures all seem to result in pathalogically bad lip sync results.
- Long hair is sometimes problematic because the head and face are animated exclusively inside an inset rectangle which will tear at the edge rather than produce natural movement in long hair, jewellery or headware that extends beyond the animated inset frame. Hair motion is not properly simulated so hairstyles rigidly fixed to the head will work best.
- Image resolution has a dramatic effect on lipsync latency and final quality but more experimentation is required to determine sweet spots.
Within the system it is feasible to use face detection and image-to-image models to evaluate and modify user-provided portraits although only basic downscaling is currently implemented.
(STT) Listens to audio and transcribes audible speech to text that is fed to the LLM.
Interesting problems:
- Voice isolation
- Distinguishing ambient speech from conversational address. A good mic and careful speaker placement would go a long way here. A second microphone could be used to add the ability to react to realistic ethical eavesdropping.
- Interruption and speaking over.
- Collaborative handling of transcription errors.
- Accent tuning.
- Round-trip pronunciation metadata. The LLM can't hear the speech, only the transcription. This may make some interactions terrible unless there is some metadata that the STT and TTS can share around pronunciation. Worst case scenarios are expected to be ridiculous.
Takes text input from the user (or some other situational instructions) and using a prepared system prompt, responds in-character with text that is fed to the text-to-speech (TTS) system.
The LLM may be useful for augmenting an additional expert system described below also for making judgements about situational workflow using several inputs: transcript, vision to text, pose estimation to text, relevant knowledge base embeddings, explicit guided review of conversation history, possibly conversation from sessions with other users at the same event.
Some form of "memory" may also be usefully implemented.
Voice synthesiser that converts text into a high quality spoken voice, cloned or selected from a library to be suitable for the character. The best quality voices found so far are available from (elevenlabs.ai)[https://elevenlabs.ai] through their API. For convenient and cheap development-mode testing, MacOS voice synthesiser is also available. The audio for the speech is fed to a Lip Sync system.
Although there are various ways to accomplish an animated character who is visibly speaking the generated speech, reasonable quality can be achieved using a model to convert a portait image and the speech audio into a video of that character speaking the words. A 3D model that is rigged for speech and gestures could also be used but both design-time and runtime components would be divergent from the current plan. The generated video is sent to the screen to present to the user as final output.
The fortune teller would initially be in a waiting state until a customer arrives. Their arrival would trigger an introductory mode of interaction with a distinct system prompt. The fortune teller would invite the customer to sit down and they would introduce themselves. Once this is done, the primary chat interaction can start. The session could be interrupted somehow and a return to the waiting state is expected until a new customer arrives. These sessions should maintain a history of the interactions, tracking the customer's name and chat history. Detection of mode transitions and the establishment of a new session with a new empty chat history can be done in part with pose estimation of video input.
In addition to the core workflow outlined above, models trained to interpret video as estimated human poses can be used to detect an approaching customer for the fortune teller or to detect untimely interruptions to a session. Hand-coded heuristics could be used for detecting approach and sitting behaviour and each would need some kind of calibration depending on the physical layout of the booth with respect to the camera position. Alternately, a setup mode could have a target zone overlay within which the customer chair is positioned. Some kind of autocalibration could be acomplished by correlating measured pose positions when addressed speech is detected.
In order to facilitate more life-like interactions of two humans who can see each other and may naturally refer to each other's appearance, a model that can describe the contents of an image can be used to provide the fortune teller a description of the person she is speaking to. During the introductory mode the fortune teller might compliment the customer on thier outfit or some other in-character smalltalk that references their appearance.
The fortune teller's own portrait can also be used as input to the image-to-text system for any given portait image so that any reference made to their own appearance can be responded to naturally and in-character. The same system might also be used to evaluate the dynamic generation of a fresh fortune-teller portrait.
The physical deployment scenario captured by a third-person camera, set back from the booth can also be fed to the image-to-text system and it's possible that the LLM is provided the resulting description to better understand what the customer might be referring to in conversation or to, for example, invite the customer to help themselves to tea or snacks.
Video sequences may be generated to make the character more life-like when it is not speaking. These can be categorised and used appropriately.
- Q: How to generate gesture animations for the character?
- Q: Could a character-design mode be worth adding where image, voice and gesture capture is configured?
- Q: Could these videos be used as additional video input to lipsync?
A traditional expert system can be used to get very low-latency intepretation of what to do under a moderate set of anticipated situations and conversational openers, to choose from a variety of pregenerated "canned" introductory video outputs. These can be used to hide latency in the full interactive workflow along with various in-character stalling behaviours that likewise do not depend on user input.
Currently only operated in devmode on MacOS. It should work on any system but
MacOsSpeech will not show up. Native subsystem implementations should detect
missing system requirements at boot and show up disabled. Likewise, if a
component implementation is missing a required API key set in the .env file,
this component will not be registered at boot time.
Database is postgres. node-pg-migrate scripts defined in server/package.json
to create tables etc. Production deployment process is yet to be defined.
Current boot-time check of git hash will fail if git is absent. Production deployment is expected to have a configured version tag instead.
Each service component listed above can have different back end implementations, both local and as online API services.
- Running on
macos(primary devmode),brewis advised for installing deps. - LM-Studio for the LM-Studio back end
- OpenAI account for the ChatGPT back end
- ElevenLabs account for the ElevenLabsVoice, and
brew install mpv - For SystemVoice on
macos, system commandsayis used. Various voices are assumed to exist. - For converting
aiffoutput audio from themacossaycommand tomp3,ffmpegis required:brew install ffmpeg gitassumed on$PATHfor devmode version definition. Database tracks each boot and run independently- SadTalker has been tested for speech audio and image to lip sync video and its
dependencies are a bit wild and hairy. Installing it on a capable MacBook Pro
required
Anaconda,ffmpegand various python packages. Instructions in the SadTalker repo are terse and insufficient as a small custom patch to one of the Python package's source code was required after some googling. - Whisper.cpp is currently being evaluated for user voice transcription.
- shows image of character
- settings panel
- can choose a different character image from set found on disk
- text input
- text output
- speech output
- lip sync video output usually works but only for human faces
- chat history shown like conversation (will probably turn off for when speech input is implemented)
- spike websockets
- keep existing endpoints for integration ease
- one websocket for streaming bidirectional state updates (need appropriate protocol)
- one websocket for media streaming
- add websocket streaming status updates so workflow orchestration status is visible via icons
- shoot project status screencast
- test lipsync and speech with failed/disabled video - should play audio keeping image portrait
- pose estimation and vision using mediapipe
- pose estimation of portrait
- download all mediapipe resources for offline operation
- WasmFileset with base url in web app, use vite build step to copy npm dep from
node_modules- check how vite lifecycle works here (plugin or ?)
- WasmFileset with base url in web app, use vite build step to copy npm dep from
- face estimation of portrait
- spike seamless audio/video streaming to server, simultaneous to client-side pose est.
- pose estimation on client - assumes stable camera (can we detect camera motion?)
- use MediaStream / MediaPipe so pose estimation can use camera stream to first detect user approach
- person object identity persistence (distinguish same vs new person present)
- see comment in
VideoCamera.tsx
- see comment in
- detect when a person approaches, describe what they look like etc.
- distinguish presence vs approach over time
- object persistence tracking with inter-frame object detection matching
- periodic pose estimation to detect mode state transitions
- ? detect if they are in an engaged mode or just looking
- invite them to sit down and chat
- enter introductions mode
- on-demand camera contents description
- this is my friend jane (if multi-punter, how to know who is speaking!?)
- does my ass look big in this
- pose estimation "auto calibration"
- if camera moves or scene changes, need to mark engagement zone in camera field
- lighting
- pose estimation and video frame grab integration [ ] punter identity persistence
- is this person the same person as checkpoint x?
- use as input to interruption mode trigger
- incorporate possible multi-person session, tag-team people who have witnessed interaction with ai already - note this means session can have multiple punter identities (think through)
- have I met this person before in a previous session?
- name and bio reference retrieval for people (stretch) - first hand data / ext data
- implement settings presets - depends on server-configured character portraits
- portrait image
- character voice (implies TTS system-specific)
- fill out feature idea for runtime system prompt design
- spike speech to text using whisper.cpp
- streaming command line transcription listening to microphone
- understand how server works - not streaming
- can server be used from loquacious app? - No.
- check smart-whisper
- run from dev server using local audio capture
- plan stream from browser microphone
- decide how to do it with video being processed by pose estimation
- can run in browser reliably?
- test large model
models/ggml-large-v3.binis very good - test medium model
- test small model
- is it feasible to stream video to server to capture speech and pose estimation? What can/should be done on the client?
- system ui
- manual pose calibration
- autocalibration of pose estimation using vision system
- character design ui
- choose portrait, upload portrait, choose voice (specify speech system), name etc.
- possibly capture gesture animation using pose estimation?
- move portrait images into server
- serve portrait image from server as static
- read about postgres types
- design for possible workflow that produces spoken audio in lipsync video directly from text message without intermediate speech audio
- check out d-id.com API for lipsync video generation streaming API could also be proxied and saved to disk. It also claims to support direct elevenlabs integration so could do speech and lipsync video in one API call.
- check Synthesia for lip sync
- check Hey Gen for lip sync
- some kind of background process to put audio and video durations in db
- design character persona and interaction workflow such that potentially long
latency responses are normalised within the theatric context.
- expert-system graph of cached and precalculated fast responses or stalling performances
- small LLM for fast detection of sentiment or context that can be appropriately stalled.
- important goddess persona might imply momentus long latency interactions because she doesn't deal with trivialities of an everyday nature
- absent-minded old character may provide cover for more explicit stalling
- guided interactions that request long inputs that are expected to deserve
long-pondering behaviour before any strict indication of comprehension or
an answering response is expected.
- e.g. if a fortune teller asks you to dig deep into your heart to ask a question of significance, it is OK to theatrically consult the crystal ball before finally providing a response
- the character should indulge in slow, high-ceremony behaviour such that high latency responses are less likely to break suspension-of-disbelief
- if the user is directed to speak slowly or can be asked to engage in ceremony too, then the expected cadence can better fit the high latency limitations of the system.
- shepherding the user away from fast banter towards deeply contemplated questions deserving of a divinely inspired being will hopefully provide cover for the otherwise conspicuous absence of fast-paced banter
- test reference data filetree (better for version control not to require database so it can be version controlled)
- check out multimodal models like LLaVA 1.5 and LLaVA 1.6
- may work to do both text and vision with the same model?
- usable cached generated output
- evaluate local AI TTS (better than macos?)
- evaluate elevenlabs websocket "realtime" streaming: https://elevenlabs.io/docs/api-reference/websockets
- use cached openings for quick-start.
- many starting inputs could be simply "hello" or other variants
- after speech-to-text recognises this as a hello input;
- the greeting is normalised ("hello there" is the same as "well hello" etc.)
- possibly split off from subsequent speech, such as "hello ... what is your name?", each could be separately cached, maybe recognition and normalisation could be done with a LLM?
- response text can be randomly selected from cached set
- response text tts should be cached (need many versions of small responses like "yes!" "yes of course!" etc.)
- need a mechanism to decide if a short response is warranted
- need some stalling responses to hide latency (distractions, pondering and thinking signals, explicit "excuse me a moment while I contemplate your words")
- asking name flow
- flexible level of persistance about wanting to know a person's name
- calling by name if available
- calling by pet names "sweetheart", "darling" etc. - add to system prompt
- avoid assumption that we are talking to a single person
- fault detection
- individual person recognition (using only recent interactions)
- functions to know what is happening, what has happened before, state of system, configuration etc.
- attract mode
- before fortune-teller sees an approaching person
- detect when a person tentatively appraoches but does not trigger start
- detect when multiple people stand gingerly nearby
- consider second camera trained on whole scene or entrance
- Per-deployment configuration needs to know:
- event details, maybe including whole schedule of events
- VIPs
- permanent physical layout and scene design details (red tablecloth, crystal ball, vase of flowers etc.)
- if a person asks about an event coming up, we could quip about telling their future: that they will go to that event
- db logging
- aggregated system logs
- usage stats
- performance log
- recent performance, best, worst, 80th percentile
- attempt to read body language and facial expressions
- stands as if to leave
- speaking to multiple visible people who take turns in the hot seat?
- expresses emotion
- evaluate if it may have been in response to something that was said
- authenticated web user with http session
- multiple concurrent sessions
The following are not proper TODOs.
- possible whole-scene photo input from secondary camera (option)
- it may help the LLM if it can see not only what it looks like but what the actual current deployment scene looks like
Currently zero tests!
- Component tests
- Full session log (replayable interactions)
- integration tests
- metrics and comparisons to alternate components (i.e. evaluating text form of responses to a suite of questions for each LLM)
- abuse cases
- LLM evaluation of response to test inputs looking for specific features or to ensure certain absences (manually review these assessments)
- Attract Mode - Nobody is engaged, but someone might see us before we see them
- Invite Mode - Somebody is detected but they have not engaged. They can probably see and hear but no fortune-telling session has started. They should be encouraged and invited to engage.
- Introduction Mode - A person has initiated a session but we don't know their name and we haven't established the pretext for the interaction
- Chat Mode - we are now engaged in a conversation
- Chat Completion - we have finished a chat
- Pause Mode - something necessitates a short pause shortly. Not considered an unresponsive interlocutor. Polite waiting behaviour is expected.
- Interruption Mode - user wants to interject for correction or to skip. Handle interaction by giving control to user to set corrective context.
- Recover Mode - one of the above modes was interrupted or did not end cleanly, behaviour might include some talking to self, musing or other.
- Identify Return mode - detect that a person is one we have talked to before. If the person was detected very recently, recover workflow to pick up any unfinished interaction. Or if the person completed a chat, ask about having another chat.
- Resume mode - after an interruption, pick up the thread.
- Tangent mode - might get off on a tangent and come back to previous "stack frame"
- Admin Mode - various system changes can be made
- Break Character Mode - where it can discuss itself, how it works, who made it see also "creator clone" scene idea.
- Reset - manual user-directed request to reset to some other mode (i.e. to show others - it should be smooth to chat as if it were fresh without past interactions informing current one (though next time they could be aggregated))
- fortune teller
- crystal ball, scrying bowl, casting bones, tarot cards
- circus variant
- character from ancient mythology
- philosopher child
- buddha kitten (animating animal faces doesn't work on sadtalker)
- creator clone - self description and explanation of how it works
- expert on self and how it works
- can converse in this mode as a general assistant but with identity stuff in system prompt
- clone my voice
- use my image to drive animation
- dev mode laptop-only
- use laptop camera, mic, speakers etc.
- macos comparison test: chrome, chromium, safari, firefox
- camera audio/video capture codec support
- consider non-web components for production installation (tradeoffs?)
- what about full mobile web app with mic & camera?
- basic feasibility - works OK but testing is horrible
- how to get dev console or logs etc. from ios chrome
- might ios safari work better than ios chrome?
- test android chrome
- specific mic and speaker alternative
- docker containers with underlying GPU resource detection
- remote API configuration
- local replacements on case-by-case
- multi-machine Deployment
- fully hosted online variant
- external effect control additions - physical lighting in theatrical scene for extra drama (e.g. flickering lamps)
- full production deployment design:
- needs to be described in system prompt
- could it be a zoltar like booth, hamming up the artificiality of the fortune teller?
- vertical TV?
- could it be a traditional fortune-teller table setting?
- maybe make it like it's a video call to a real person?
The following data structure needs to be seeded, expanded, augmented and merged in various ways.
- reference portrait
- reference pose video graph
- interconnected animations are edges, fixed poses are nodes
- a graph may give nonlinear, realistic animations that are sufficiently polished
- reversible gesture animations
- mocap animations don't necessarily return to origin pose,
- experiment with boomerang video animation to return to origin
- voice model - makes sense to attach a voice to a portrait
- vocal fx chain
- pre-lip sync (e.g. speaking speed, band-pass, noise reduction, comp)
- post-lip sync (e.g. reverb, re-pitch)
- define in-app audio fx vs external audio fx
For pose variations for example, the tweening between each pose may need to be precomputed so that a generated pose reference video can be fed to a lip-sync model such as sadtalker. Various generated animation tweens may not be good. These can be ai-generated at a kind of character-compile time. From a graph of generated tweening animations, composite animations can be achieved by simple video playback. These do not need to be skinned and may be skeletal animations, recorded video, synthesized animations or acquired by third-party library. In each case they can be used as input for pose animation during lip sync.
A camera on the user can be used to feed visual description to an orchestration model. Their appearance can be used as a talking point delivered as an aside, prepared ahead of time to cover latency gaps.
Various uses for pose-estimation include: User arrival, departure, changes in the number of people present, attention changes, observing compliance or non-compliance with any requested interactions.
Recording of user behaviour for later quality control review, automated testing and possible future training.
Use image-to-text to describe the character's self-image and construct a story and some comments about it.
- From pose-estimation
- From face interpretation
- From paraverbal vocalisation
- Corrections / misunderstandings
- Failure to hear
- Interruptions and continuations
- Being spoken about vs being spoken to
- System failure requiring operator intervention
- What is the physical deployment scenario
- festival
- party/event
- Reference material for important people known to all at event
- Host / hostess
- Schedule of events
- Memory of people seen in previous sessions
- Self-knowledge narrative
- Meta-understanding
- does not break character or betray that it is an AI
- is not willing to break character by sharing unlikely expert knowledge
- if, say, asked about quantum physics, summarily describes vague references remaining in character
- elevenlabs
- voice clone
- what is the best tts that can run locally?
- slow speech cadence
- canned smalltalk
- pregenerated output for response graph driven by expert system and elaborated
by LLM for variety.
- LLM can detect equivalence of phrases and help choose a pregenerated response.
- chunked TTS producing chunked lipsync video
- cut LLM output text into paragraphs or sentences
- generate individual voice for each fragment
- elevenlabs API supports providing preceding and proceeding context
- feed multiple speech audio chunks to lipsync in parallel
- modify front-end to work with a dynamic queue of video streams played sequentially
- environmental theatrics - externally controlled sound effects, crystal ball, etc.
- crafted stalling and in-character ceremony - e.g. reading tarot cards or "gaze into my eyes while I consider your question" consult the spirits of the ancestors" streaming - every stage should stream
- chunk feeding of part of input may enable preemptive response parts, e.g. Prepare a restatement of initial part of input while rendering full response. May need to break response into consideration/reflection/contemplation segment which is calculated not to depend on the real response and the stripped-back core response which does.¬
- google-webfont-helper cool tool for downloading google fonts in
.woff2format