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",(0,o.kt)("strong",{parentName:"p"},"baseURL")," instead of ",(0,o.kt)("inlineCode",{parentName:"p"},"umd"),":"),(0,o.kt)("p",{parentName:"admonition"},(0,o.kt)("del",{parentName:"p"},(0,o.kt)("a",{parentName:"del",href:"https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd"},"https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd"))," => ",(0,o.kt)("a",{parentName:"p",href:"https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/esm"},"https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/esm"))),(0,o.kt)("pre",null,(0,o.kt)("code",{parentName:"pre",className:"language-jsx",metastring:"live",live:!0},"// import { FFmpeg } from '@ffmpeg/ffmpeg';\n// import { fetchFile, toBlobURL } from '@ffmpeg/util';
1\nfunction() {\n const [loaded, setLoaded] = useState(false);\n const ffmpegRef = useRef(new FFmpeg());\n const videoRef = useRef(null);\n const messageRef = useRef(null);\n\n const load = async () => {\n const baseURL = 'https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd'\n const ffmpeg = ffmpegRef.current;\n ffmpeg.on('log', ({ message }) => {\n messageRef.current.innerHTML = message;\n console.log(message);\n });\n // toBlobURL is used to bypass CORS issue, urls with the same\n // domain can be used directly.\n await ffmpeg.load({\n coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),\n wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),\n });\n setLoaded(true);\n }\n\n const transcode = async () => {\n const ffmpeg = ffmpegRef.current;\n await ffmpeg.writeFile('input.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s.webm'));\n await ffmpeg.exec(['-i', 'input.webm', 'output.mp4']);\n const data = await ffmpeg.readFile('output.mp4');\n videoRef.current.src =\n URL.createObjectURL(new Blob([data.buffer], {type: 'video/mp4'}));\n }\n\n return (loaded\n ? (\n <>\n <video ref={videoRef} controls></video><br/>\n <button onClick={transcode}>Transcode webm to mp4</button>\n <p ref={messageRef}></p>\n <p>Open Developer Tools (Ctrl+Shift+I) to View Logs</p>\n </>\n )\n : (\n <button onClick={load}>Load ffmpeg-core (~31 MB)</button>\n )\n );\n}\n")),(0,o.kt)("h2",{id:"transcode-webm-to-mp4-video-multi-thread"},"Transcode webm to mp4 video (multi-thread)"),(0,o.kt)("admonition",{type:"caution"},(0,o.kt)("p",{parentName:"admonition"},"As SharedArrayBuffer is required for multithread version, make sure\nyou have have fulfilled ",(0,o.kt)("a",{parentName:"p",href:"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer#security_requirements"},"Security Requirements"),".")),(0,o.kt)("pre",null,(0,o.kt)("code",{parentName:"pre",className:"language-jsx",metastring:"live",live:!0},"// import { FFmpeg } from '@ffmpeg/ffmpeg';\n// import { fetchFile, toBlobURL } from '@ffmpeg/util';\nfunction() {\n const [loaded, setLoaded] = useState(false);\n const ffmpegRef = useRef(new FFmpeg());\n const videoRef = useRef(null);\n const messageRef = useRef(null);\n\n const load = async () => {\n const baseURL = 'https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd'\n const ffmpeg = ffmpegRef.current;\n ffmpeg.on('log', ({ message }) => {\n messageRef.current.innerHTML = message;\n console.log(message);\n });\n // toBlobURL is used to bypass CORS issue, urls with the same\n // domain can be used directly.\n await ffmpeg.load({\n coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),\n wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),\n workerURL: await toBlobURL(`${baseURL}/ffmpeg-core.worker.js`, 'text/javascript'),\n });\n setLoaded(true);\n }\n\n const transcode = async () => {\n const ffmpeg = ffmpegRef.current;\n await ffmpeg.writeFile('input.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s.webm'));\n await ffmpeg.exec(['-i', 'input.webm', 'output.mp4']);\n const data = await ffmpeg.readFile('output.mp4');\n videoRef.current.src =\n URL.createObjectURL(new Blob([data.buffer], {type: 'video/mp4'}));\n }\n\n return (loaded\n ? (\n <>\n <video ref={videoRef} controls></video><br/>\n <button onClick={transcode}>Transcode webm to mp4</button>\n <p ref={messageRef}></p>\n <p>
1Open Developer Tools (Ctrl+Shift+I) to View Logs</p>\n </>\n )\n : (\n <button onClick={load}>Load ffmpeg-core (~31 MB)</button>\n )\n );\n}\n")),(0,o.kt)("h2",{id:"transcode-video-with-timeout"},"Transcode video with timeout"),(0,o.kt)("pre",null,(0,o.kt)("code",{parentName:"pre",className:"language-jsx",metastring:"live",live:!0},"// import { FFmpeg } from '@ffmpeg/ffmpeg';\n// import { fetchFile } from '@ffmpeg/util';\nfunction() {\n const [loaded, setLoaded] = useState(false);\n const ffmpegRef = useRef(new FFmpeg());\n const videoRef = useRef(null);\n const messageRef = useRef(null);\n\n const load = async () => {\n const baseURL = 'https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd'\n const ffmpeg = ffmpegRef.current;\n ffmpeg.on('log', ({ message }) => {\n messageRef.current.innerHTML = message;\n console.log(message);\n });\n // toBlobURL is used to bypass CORS issue, urls with the same\n // domain can be used directly.\n await ffmpeg.load({\n coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),\n wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),\n });\n setLoaded(true);\n }\n\n const transcode = async () => {\n const ffmpeg = ffmpegRef.current;\n await ffmpeg.writeFile('input.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s.webm'));\n // The exec should stop after 1 second.\n await ffmpeg.exec(['-i', 'input.webm', 'output.mp4'], 1000);\n const data = await ffmpeg.readFile('output.mp4');\n videoRef.current.src =\n URL.createObjectURL(new Blob([data.buffer], {type: 'video/mp4'}));\n }\n\n return (loaded\n ? (\n <>\n <video ref={videoRef} controls></video><br/>\n <button onClick={transcode}>Transcode webm to mp4</button>\n <p ref={messageRef}></p>\n <p>Open Developer Tools (Ctrl+Shift+I) to View Logs</p>\n </>\n )\n : (\n <button onClick={load}>Load ffmpeg-core (~31 MB)</button>\n )\n );\n}\n")),(0,o.kt)("h2",{id:"transcode-video-with-progress-experimental"},"Transcode video with progress (experimental)"),(0,o.kt)("admonition",{type:"danger"},(0,o.kt)("p",{parentName:"admonition"},(0,o.kt)("inlineCode",{parentName:"p"},"progress")," is an experimental feature and might not work for many cases\n(ex. concat video files, convert image files, ...). Please use with caution.")),(0,o.kt)("pre",null,(0,o.kt)("code",{parentName:"pre",className:"language-jsx",metastring:"live",live:!0},"// import { FFmpeg } from '@ffmpeg/ffmpeg';\n// import { fetchFile } from '@ffmpeg/util';\nfunction() {\n const [loaded, setLoaded] = useState(false);\n const ffmpegRef = useRef(new FFmpeg());\n const videoRef = useRef(null);\n const messageRef = useRef(null);\n\n const load = async () => {\n const baseURL = 'https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd'\n const ffmpeg = ffmpegRef.current;\n // Listen to progress event instead of log.\n ffmpeg.on('progress', ({ progress, time }) => {\n messageRef.current.innerHTML = `${progress * 100} % (transcoded time: ${time / 1000000} s)`;\n });\n // toBlobURL is used to bypass CORS issue, urls with the same\n // domain can be used directly.\n await ffmpeg.load({\n coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),\n wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),\n });\n setLoaded(true);\n }\n\n const transcode = async () => {\n const ffmpeg = ffmpegRef.current;\n await ffmpeg.writeFile('input.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s.webm'));\n await ffmpeg.exec(['-i', 'input.webm', 'output.mp4']);\n const data = await ffmpeg.readFile('output.mp4');\n videoRef.current.src =\n URL.createObjectURL(new Blob([data.buffer], {type: 'video/mp4'}));\n }\n\n return (loaded\n ? (\n <>\n <video ref={videoRef} controls></video><br/>\n <button onClick={transcode}>Transcode webm to mp4</button>\n <p ref={messageRef}></p>\n </>\n )\n : (\n <button onClick={load}>Load ffmpeg-core (~31 MB)</button>\n )\n );\n}\n")),(0,o.kt)("h2",{id:"split-video-into-segments-of-equal-duration"},"Split video into segments of equal duration"),(0,o.kt)("pre",null,(0,o.kt)("code",{parentName:"pre",className:"language-jsx",metastring:"live",live:!0},"// import { FFmpeg } from '@ffmpeg/ffmpeg';\n// import { fetchFile } from '@ffmpeg/util';
1\nfunction() {\n const [loaded, setLoaded] = useState(false);\n const ffmpegRef = useRef(new FFmpeg());\n const videoRef = useRef(null);\n const messageRef = useRef(null);\n\n const load = async () => {\n const baseURL = 'https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd'\n const ffmpeg = ffmpegRef.current;\n ffmpeg.on('log', ({ message }) => {\n messageRef.current.innerHTML = message;\n console.log(message);\n });\n // toBlobURL is used to bypass CORS issue, urls with the same\n // domain can be used directly.\n await ffmpeg.load({\n coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),\n wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),\n });\n setLoaded(true);\n }\n\n const transcode = async () => {\n const ffmpeg = ffmpegRef.current;\n await ffmpeg.writeFile('input.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s.webm'));\n await ffmpeg.exec([\n '-i',\n 'input.webm',\n '-f',\n 'segment',\n '-segment_time',\n '3',\n '-g',\n '9',\n '-sc_threshold',\n '0',\n '-force_key_frames',\n 'expr:gte(t,n_forced*9)',\n '-reset_timestamps',\n '1',\n '-map',\n '0',\n 'output_%d.mp4'\n ]);\n const data = await ffmpeg.readFile('output_1.mp4');\n videoRef.current.src =\n URL.createObjectURL(new Blob([data.buffer], {type: 'video/mp4'}));\n }\n\n return (loaded\n ? (\n <>\n <video ref={videoRef} controls></video><br/>\n <button onClick={transcode}>Split video to segments of 3 sec. and plays 2nd segment</button>\n <p ref={messageRef}></p>\n <p>Open Developer Tools (Ctrl+Shift+I) to View Logs</p>\n </>\n )\n : (\n <button onClick={load}>Load ffmpeg-core (~31 MB)</button>\n )\n );\n}\n")),(0,o.kt)("h2",{id:"display-text-on-the-video"},"Display Text on the video"),(0,o.kt)("pre",null,(0,o.kt)("code",{parentName:"pre",className:"language-jsx",metastring:"live",live:!0},"// import { FFmpeg } from '@ffmpeg/ffmpeg';\n// import { fetchFile } from '@ffmpeg/util';\nfunction() {\n const [loaded, setLoaded] = useState(false);\n const ffmpegRef = useRef(new FFmpeg());\n const videoRef = useRef(null);\n const messageRef = useRef(null);\n\n const load = async () => {\n const baseURL = 'https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd'\n const ffmpeg = ffmpegRef.current;\n ffmpeg.on('log', ({ message }) => {\n messageRef.current.innerHTML = message;\n console.log(message);\n });\n // toBlobURL is used to bypass CORS issue, urls with the same\n // domain can be used directly.\n await ffmpeg.load({\n coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),\n wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),\n });\n setLoaded(true);\n }\n\n const transcode = async () => {\n const ffmpeg = ffmpegRef.current;\n await ffmpeg.writeFile('input.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s.webm'));\n await ffmpeg.writeFile('arial.ttf', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/arial.ttf'));\n await ffmpeg.exec([\n '-i',\n 'input.webm',\n '-vf',\n 'drawtext=fontfile=/arial.ttf:text=\\'ffmpeg.wasm\\':x=10:y=10:fontsize=24:fontcolor=white',\n 'output.mp4',\n ]);\n const data = await ffmpeg.readFile('output.mp4');\n videoRef.current.src =\n URL.createObjectURL(new Blob([data.buffer], {type: 'video/mp4'}));\n }\n\n return (loaded\n ? (\n <>\n <video ref={videoRef} controls></video><br/>\n <button onClick={transcode}>Transcode webm to mp4 with text</button>\n <p ref={messageRef}></p>\n <p>
1Open Developer Tools (Ctrl+Shift+I) to View Logs</p>\n </>\n )\n : (\n <button onClick={load}>Load ffmpeg-core (~31 MB)</button>\n )\n );\n}\n")),(0,o.kt)("h2",{id:"interlace-2-videos"},"Interlace 2 Videos"),(0,o.kt)("pre",null,(0,o.kt)("code",{parentName:"pre",className:"language-jsx",metastring:"live",live:!0},"// import { FFmpeg } from '@ffmpeg/ffmpeg';\n// import { fetchFile } from '@ffmpeg/util';\nfunction() {\n const [loaded, setLoaded] = useState(false);\n const ffmpegRef = useRef(new FFmpeg());\n const videoRef = useRef(null);\n const messageRef = useRef(null);\n\n const load = async () => {\n const baseURL = 'https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd'\n const ffmpeg = ffmpegRef.current;\n ffmpeg.on('log', ({ message }) => {\n messageRef.current.innerHTML = message;\n console.log(message);\n });\n // toBlobURL is used to bypass CORS issue, urls with the same\n // domain can be used directly.\n await ffmpeg.load({\n coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),\n wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),\n });\n setLoaded(true);\n }\n\n const transcode = async () => {\n const ffmpeg = ffmpegRef.current;\n await ffmpeg.writeFile('input.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s.webm'));\n await ffmpeg.writeFile('reversed.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s_reversed.webm'));\n await ffmpeg.exec([\n '-i',\n 'input.webm',\n '-i',\n 'reversed.webm',\n '-filter_complex',\n '[0:v][1:v]blend=all_expr=\\'A*(if(eq(0,N/2),1,T))+B*(if(eq(0,N/2),T,1))\\'',\n 'output.mp4',\n ]);\n const data = await ffmpeg.readFile('output.mp4');\n videoRef.current.src =\n URL.createObjectURL(new Blob([data.buffer], {type: 'video/mp4'}));\n }\n\n return (loaded\n ? (\n <>\n <video ref={videoRef} controls></video><br/>\n <button onClick={transcode}>Interlace two webm video to mp4</button>\n <p ref={messageRef}></p>\n <p>Open Developer Tools (Ctrl+Shift+I) to View Logs</p>\n </>\n )\n : (\n <button onClick={load}>Load ffmpeg-core (~31 MB)</button>\n )\n );\n}\n")),(0,o.kt)("h2",{id:"use-workerfs"},"Use WORKERFS"),(0,o.kt)("admonition",{type:"note"},(0,o.kt)("p",{parentName:"admonition"},"Required:"),(0,o.kt)("ul",{parentName:"admonition"},(0,o.kt)("li",{parentName:"ul"},"@ffmpeg/",(0,o.kt)("a",{parentName:"li",href:"mailto:[email protected]"},"[email protected]"),"+"),(0,o.kt)("li",{parentName:"ul"},"@ffmpeg/",(0,o.kt)("a",{parentName:"li",href:"mailto:[email protected]"},"[email protected]"),"+\n:::")),(0,o.kt)("p",{parentName:"admonition"},"Please Check this PR: ",(0,o.kt)("a",{parentName:"p",href:"https://github.com/ffmpegwasm/ffmpeg.wasm/pull/581"},"Add WORKERFS support")),(0,o.kt)("h2",{parentName:"admonition",id:"abort-exec-with-signal"},"Abort exec() with signal")),(0,o.kt)("p",null,"Required:"),(0,o.kt)("ul",null,(0,o.kt)("li",{parentName:"ul"},"@ffmpeg/",(0,o.kt)("a",{parentName:"li",href:"mailto:[email protected]"},"[email protected]"),"+"),(0,o.kt)("li",{parentName:"ul"},"@ffmpeg/",(0,o.kt)("a",{parentName:"li",href:"mailto:[email protected]"},"[email protected]"),"+\n:::")),(0,o.kt)("p",null,"Please check this PR: ",(0,o.kt)("a",{parentName:"p",href:"https://github.com/ffmpegwasm/ffmpeg.wasm/pull/573"},"abort signal")))}l.isMDXComponent=!0}}]);
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