Fix compression for one-audio track files
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parent
f27f8b01aa
commit
1a41e1bd72
3 changed files with 47 additions and 12 deletions
34
src/main.ts
34
src/main.ts
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@ -66,6 +66,9 @@ app.whenReady().then(() => {
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const tmpFile = getNewFilename(file, "TMP_");
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let outFile;
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// One track for the video
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let nbTracks = 1;
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// Merge 2 audio
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// See: https://trac.ffmpeg.org/wiki/AudioChannelManipulation#a2stereostereo
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await execute(
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@ -83,6 +86,7 @@ app.whenReady().then(() => {
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) {
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// Only one audio in the file
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outFile = getNewFilename(file, "(processed) ");
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nbTracks += 1;
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// Do a copy
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await execute(`${copy} "${file}" "${outFile}" ${copyArg}`).catch(
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@ -102,6 +106,7 @@ app.whenReady().then(() => {
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}
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outFile = getNewFilename(file, "(merged audio) ");
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nbTracks += 3;
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// Add merged audio as first position to original video and make it default
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// About disposition: https://ffmpeg.org/ffmpeg.html#Main-options
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// Also rename all tracks accordingly to what they are
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@ -121,11 +126,20 @@ app.whenReady().then(() => {
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const duration = getVideoDuration(outFile);
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const stats = statSync(outFile);
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return { title: outFile, size: stats.size / 1024 / 1024, duration };
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return {
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title: outFile,
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size: stats.size / 1024 / 1024,
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duration,
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nbTracks,
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};
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};
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/* Reduce size of a file */
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const reduceSize = async (file: string, bitrate: number) => {
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const reduceSize = async (
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file: string,
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bitrate: number,
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nbTracks: number
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) => {
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const audioBitrate = 400; // keep some room
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const videoBitrate = bitrate - audioBitrate;
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@ -134,6 +148,14 @@ app.whenReady().then(() => {
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// Trash the output, depends on the platform
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const nul = process.platform === "win32" ? "NUL" : "/dev/null";
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// Mapping of tracks for FFMPEG
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const mappingTracks = Array(nbTracks)
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.fill("-map 0:")
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.map(function (str, index) {
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return str + index;
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})
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.join(" ");
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// Compress the video
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// Add metadata to audio's track
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await execute(
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@ -145,7 +167,7 @@ app.whenReady().then(() => {
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"${ffmpegPath}" -y \
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-i "${file}" \
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-c:v libx264 -b:v ${videoBitrate}k -pass 2 -c:a copy \
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-map 0:0 -map 0:1 -map 0:2 -map 0:3 -f mp4 \
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${mappingTracks} -f mp4 \
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${metadataAudio} \
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"${finalFile}"`
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).catch((e) => printAndDevTool(win, e));
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@ -165,8 +187,10 @@ app.whenReady().then(() => {
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ipcMain.handle("getFilename", (_, filepath: string) => getFilename(filepath));
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ipcMain.handle("askFiles", () => askFiles());
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ipcMain.handle("mergeAudio", (_, file: string) => mergeAudio(file));
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ipcMain.handle("reduceSize", (_, file: string, bitrate: number) =>
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reduceSize(file, bitrate)
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ipcMain.handle(
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"reduceSize",
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(_, file: string, bitrate: number, nbTracks: number) =>
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reduceSize(file, bitrate, nbTracks)
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);
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ipcMain.handle("exit", () => app.quit());
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ipcMain.handle("confirmation", (_, text: string) => confirmation(text));
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@ -13,8 +13,8 @@ contextBridge.exposeInMainWorld("internals", {
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ipcRenderer.invoke("getFilename", filepath),
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askFiles: () => ipcRenderer.invoke("askFiles"),
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mergeAudio: (file: string) => ipcRenderer.invoke("mergeAudio", file),
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reduceSize: (file: string, bitrate: number) =>
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ipcRenderer.invoke("reduceSize", file, bitrate),
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reduceSize: (file: string, bitrate: number, nbTracks: number) =>
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ipcRenderer.invoke("reduceSize", file, bitrate, nbTracks),
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exit: () => ipcRenderer.invoke("exit"),
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confirmation: (text: string) => ipcRenderer.invoke("confirmation", text),
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});
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@ -7,10 +7,17 @@ let internals: {
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getFilename: (filepath: string) => Promise<string>;
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askFiles: () => Promise<string[] | undefined>;
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exit: () => Promise<void>;
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mergeAudio: (
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filename: string
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) => Promise<{ title: string; duration: number; size: number }>;
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reduceSize: (file: string, bitrate: number) => Promise<string>;
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mergeAudio: (filename: string) => Promise<{
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title: string;
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duration: number;
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size: number;
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nbTracks: number;
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}>;
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reduceSize: (
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file: string,
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bitrate: number,
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nbTracks: number
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) => Promise<string>;
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confirmation: (text: string) => Promise<void>;
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};
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@ -119,7 +126,11 @@ const main = async () => {
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);
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// Compress the video and change the title to the new one
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finalTitle = await internals.reduceSize(newFile.title, bitrate);
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finalTitle = await internals.reduceSize(
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newFile.title,
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bitrate,
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newFile.nbTracks
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);
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}
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// Append title to the list of processed files
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