Merge pull request #119 from C043/main

Adds change speed video tool

src/components/input/BaseFileInput.tsx

@@ -41,7 +41,7 @@ export default function BaseFileInput({
       } catch (error) {
         console.error('Error previewing file:', error);
       }
-    }
+    } else setPreview(null);
   }, [value]);
 
   const handleFileChange = (event: React.ChangeEvent<HTMLInputElement>) => {
@@ -67,11 +67,6 @@ export default function BaseFileInput({
     }
   };
 
-  function handleClear() {
-    // @ts-ignore
-    onChange(null);
-  }
-
   const handleDrop = (event: React.DragEvent<HTMLDivElement>) => {
     event.preventDefault();
     event.stopPropagation();
@@ -213,11 +208,7 @@ export default function BaseFileInput({
           </Box>
         )}
       </Box>
-      <InputFooter
-        handleCopy={handleCopy}
-        handleImport={handleImportClick}
-        handleClear={handleClear}
-      />
+      <InputFooter handleCopy={handleCopy} handleImport={handleImportClick} />
       <input
         ref={fileInputRef}
         style={{ display: 'none' }}

src/pages/tools/video/change-speed/index.tsx

@@ -0,0 +1,169 @@
+import { Box } from '@mui/material';
+import React, { useState } from 'react';
+import ToolContent from '@components/ToolContent';
+import { ToolComponentProps } from '@tools/defineTool';
+import { GetGroupsType } from '@components/options/ToolOptions';
+import { InitialValuesType } from './types';
+import ToolVideoInput from '@components/input/ToolVideoInput';
+import ToolFileResult from '@components/result/ToolFileResult';
+import TextFieldWithDesc from '@components/options/TextFieldWithDesc';
+import { FFmpeg } from '@ffmpeg/ffmpeg';
+import { fetchFile } from '@ffmpeg/util';
+
+const initialValues: InitialValuesType = {
+  newSpeed: 2
+};
+
+export default function ChangeSpeed({
+  title,
+  longDescription
+}: ToolComponentProps) {
+  const [input, setInput] = useState<File | null>(null);
+  const [result, setResult] = useState<File | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  // FFmpeg only supports a tempo between 0.5 and 2.0, so we chain filters
+  const computeAudioFilter = (speed: number): string => {
+    if (speed <= 2 && speed >= 0.5) {
+      return `atempo=${speed}`;
+    }
+
+    // Break into supported chunks
+    const filters: string[] = [];
+    let remainingSpeed = speed;
+    while (remainingSpeed > 2.0) {
+      filters.push('atempo=2.0');
+      remainingSpeed /= 2.0;
+    }
+    while (remainingSpeed < 0.5) {
+      filters.push('atempo=0.5');
+      remainingSpeed /= 0.5;
+    }
+    filters.push(`atempo=${remainingSpeed.toFixed(2)}`);
+
+    return filters.join(',');
+  };
+
+  const compute = (optionsValues: InitialValuesType, input: File | null) => {
+    if (!input) return;
+    const { newSpeed } = optionsValues;
+    let ffmpeg: FFmpeg | null = null;
+    let ffmpegLoaded = false;
+
+    const processVideo = async (
+      file: File,
+      newSpeed: number
+    ): Promise<void> => {
+      if (newSpeed === 0) return;
+      setLoading(true);
+
+      if (!ffmpeg) {
+        ffmpeg = new FFmpeg();
+      }
+
+      if (!ffmpegLoaded) {
+        await ffmpeg.load({
+          wasmURL:
+            'https://cdn.jsdelivr.net/npm/@ffmpeg/core@0.12.9/dist/esm/ffmpeg-core.wasm'
+        });
+        ffmpegLoaded = true;
+      }
+
+      // Write file to FFmpeg FS
+      const fileName = file.name;
+      const outputName = 'output.mp4';
+
+      try {
+        ffmpeg.writeFile(fileName, await fetchFile(file));
+
+        const videoFilter = `setpts=${1 / newSpeed}*PTS`;
+        const audioFilter = computeAudioFilter(newSpeed);
+
+        // Run FFmpeg command
+        await ffmpeg.exec([
+          '-i',
+          fileName,
+          '-vf',
+          videoFilter,
+          '-filter:a',
+          audioFilter,
+          '-c:v',
+          'libx264',
+          '-preset',
+          'ultrafast',
+          '-c:a',
+          'aac',
+          outputName
+        ]);
+
+        const data = await ffmpeg.readFile(outputName);
+
+        // Create new file from processed data
+        const blob = new Blob([data], { type: 'video/mp4' });
+        const newFile = new File(
+          [blob],
+          file.name.replace('.mp4', `-${newSpeed}x.mp4`),
+          { type: 'video/mp4' }
+        );
+
+        // Clean up to free memory
+        await ffmpeg.deleteFile(fileName);
+        await ffmpeg.deleteFile(outputName);
+
+        setResult(newFile);
+      } catch (err) {
+        console.error(`Failed to process video: ${err}`);
+        throw err;
+      } finally {
+        setLoading(false);
+      }
+    };
+
+    // Here we set the output video
+    processVideo(input, newSpeed);
+  };
+
+  const getGroups: GetGroupsType<InitialValuesType> | null = ({
+    values,
+    updateField
+  }) => [
+    {
+      title: 'New Video Speed',
+      component: (
+        <Box>
+          <TextFieldWithDesc
+            value={values.newSpeed.toString()}
+            onOwnChange={(val) => updateField('newSpeed', Number(val))}
+            description="Default multiplier: 2 means 2x faster"
+            type="number"
+          />
+        </Box>
+      )
+    }
+  ];
+  return (
+    <ToolContent
+      title={title}
+      input={input}
+      inputComponent={
+        <ToolVideoInput
+          value={input}
+          onChange={setInput}
+          title={'Input Video'}
+        />
+      }
+      resultComponent={
+        loading ? (
+          <ToolFileResult title="Setting Speed" value={null} loading={true} />
+        ) : (
+          <ToolFileResult title="Edited Video" value={result} extension="mp4" />
+        )
+      }
+      initialValues={initialValues}
+      getGroups={getGroups}
+      setInput={setInput}
+      compute={compute}
+      toolInfo={{ title: `What is a ${title}?`, description: longDescription }}
+    />
+  );
+}

src/pages/tools/video/change-speed/meta.ts

@@ -0,0 +1,13 @@
+import { defineTool } from '@tools/defineTool';
+import { lazy } from 'react';
+
+export const tool = defineTool('video', {
+  name: 'Change speed',
+  path: 'change-speed',
+  icon: 'material-symbols-light:speed-outline',
+  description:
+    'This online utility lets you change the speed of a video. You can speed it up or slow it down.',
+  shortDescription: 'Quickly change video speed',
+  keywords: ['change', 'speed'],
+  component: lazy(() => import('./index'))
+});

src/pages/tools/video/change-speed/service.ts

@@ -0,0 +1,8 @@
+import { InitialValuesType } from './types';
+
+export function main(
+  input: File | null,
+  options: InitialValuesType
+): File | null {
+  return input;
+}

src/pages/tools/video/change-speed/types.ts

@@ -0,0 +1,3 @@
+export type InitialValuesType = {
+  newSpeed: number;
+};

src/pages/tools/video/index.ts

@@ -1,3 +1,4 @@
+import { tool as videoChangeSpeed } from './change-speed/meta';
 import { tool as videoFlip } from './flip/meta';
 import { rotate } from '../string/rotate/service';
 import { gifTools } from './gif';
@@ -6,6 +7,7 @@ import { tool as rotateVideo } from './rotate/meta';
 import { tool as compressVideo } from './compress/meta';
 import { tool as loopVideo } from './loop/meta';
 import { tool as flipVideo } from './flip/meta';
+import { tool as changeSpeed } from './change-speed/meta';
 
 export const videoTools = [
   ...gifTools,
@@ -13,5 +15,6 @@ export const videoTools = [
   rotateVideo,
   compressVideo,
   loopVideo,
-  flipVideo
+  flipVideo,
+  changeSpeed
 ];