![]() In a real-world implementation, you will want to pre-load your GIF file before it talks, and avoid storing too many GIF files in memory simultaneously. Non-talkr GIF files may consume significantly more memory depending on the number of frames and pixels, and the cropping of the frames (talkr GIF files are optimized and aggressivly cropped to keep memory use low). This can take several seconds on a slow device and consume around 10 MB of memory for GIF files exported from talkr which have a width of 480 pixels. ![]() Prior to playing, the frames of the GIF file must be extracted and stored in memory. For more information on how to use the SuperGif class, check out the original libgif project. Of note to the developer, libjs.gif contains a class SuperGif, which can be used to manipulate animated gifs. See the same-domain origin caveat at the bottom of this document for more information.įor a hosted example, check out this post on Technical Details Please note: this example must be loaded via a webserver, not directly from disk. ![]() It allows you to change the voice and text and watch it talk on various GIFs. Please see example.html for, you know, an example. +- TALKRAPP -+ Application Identifier (8 bytes)ġ2 | COM | Application Authentication Code (3 bytes)ġ9 | CHANNEL IDX | ('0'=Blink,'1'=Eyebrow)| You can find some regular gif files without the TALKRAPP extension here. GIF files with this extension, but a selection of examples is available from imgur. ![]() The Premium version ($2.99) of the iOS app Talkr ( supports outputing. This can bring movement to the upper part of the face with out making the gif overly repetitive or predictable. These are not looped as part of the normal animation, and instead are layered on top at random intervals. The app extension is used to determine which frames (if any) should be used to create eyebrow and blink animations. The extension does not alter how the GIF is played back in browsers where there is no support for it. The app extension is similar to the popular NETSCAPE looping extension. More than a second or two of animation is overkill, the early frames are more important that what comes later.Ī new GIF app extension was created to specify animation channels that could be layered on top of the lipsync animation. This can result in an overly flappy mouth.Īvoid large gestures or movements in the early frames which will be repeated very frequently. The mouth should open relatively quickly in the early framesįor several frames after the initial opening, avoid frames that completely close the mouth. The GIF should feature something talking (obviously) Here are some tips for selecting an optimal GIF file (in rough order of importance) Pauses in the utterances are then automatically aligned with periods of non-movement in the GIF file. Speech synthesis is broken up into punctuation-deliminated utterances, and each utterance is animated with its own call to play_with_duration. (the direction of playback is reversed at the correct time such that playback ends at frame zero) The gif "ping-pongs" while there is talking, and always starts and ends at frame 0. Speech duration is estimated using the length of the text to be spoken and passed to the the play_with_duration() function The SpeechSynthesis start event is used to start the gif animation. The following tricks are used to improve results: This is an attempt to animate a GIF file in sync with the SpeechSynthesis web API. Overviewįorked from the excelent libgif-js project, which is a general-purpose gif parsing and playback framework. ![]() Loading times and memory usage are improved dramatically with APNG, the implementation uses only a single canvas, and PNG files fully support transpacency. Please check out smooth-talkr for an example of an application that uses a superior APNG method talkr-apng. ![]()
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