wulkano/kap

APNG file size is huge - 15x larger than gifs

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#910 建立於 2020年8月11日

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 (2 留言) (0 反應) (0 負責人)JavaScript (11,043 star) (548 fork)batch import
Help Wanted

描述

I exported the same short 8 second, 800x550 pixel clip at 15 FPS to mp4, gif and apng.

The mp4 is 76kb The gif is 870kb The apng is 12.6mb

According to these tests run using gifapng APNG should be smaller filesize than GIF.

There seems to be some major bloat/issue with the way Kap is exporting APNGs.

Gif Example test

All examples in zip (as Github doesnt support APNG) test-exports.zip

貢獻者指南

技術棧
javascriptelectron
領域
desktopperformance
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
half day
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Basic understanding of image encodingKnowledge of Kap's export pipeline
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
60
研究方向
Start by examining the APNG export code in Kap's source repository, likely under the 'export' or 'formats' directory. Compare the generated APNG file structure to expected output from tools like gifapng. Look for issues such as duplicate frames, incorrect disposal methods, or lack of compression. The attached zip file contains example outputs for reference. Additionally, review the two existing comments on the issue for any hints or suggestions from the community.