dziurkacz-fast.mjs

@@ -12,9 +12,6 @@ const FREQ = 48000;
 const FRAMERATE = parseFloat(
   (await $`mediainfo --Output="Video;%FrameRate%" ${video}`).stdout
 );
-const BITRATE = parseFloat(
-  (await $`mediainfo --Inform="Video;%BitRate/String%" ${video}`).stdout
-);
 
 const labels_contents = (await $`awk '{print $3, $4, $5}' < ${labels}`).stdout;
 
@@ -75,20 +72,20 @@ current_piece.end = all_frames[all_frames.length - 1];
 
 pieces.push(current_piece);
 
-// this approach is using a filter, so it requires reencoding the entire video, but lets us be very precise:
-// const filter = pieces
-//   .map(
-//     ({ start, end }) =>
-//       `between(t,${(start / FRAMERATE).toFixed(5)},${(end / FRAMERATE).toFixed(
-//         5
-//       )})`
-//   )
-//   .join("+");
+// discarding this as using a filter requires reencoding the entire video:
+const filter = pieces
+  .map(
+    ({ start, end }) =>
+      `between(t,${(start / FRAMERATE).toFixed(5)},${(end / FRAMERATE).toFixed(
+        5
+      )})`
+  )
+  .join("+");
 
-// await $`ffmpeg -i ${video} \
-//                -vf ${`select='${filter}',setpts=N/FRAME_RATE/TB`} \
-//                -af ${`aselect='${filter}',asetpts=N/SR/TB`} \
-//                ${video + ".cut.mp4"}`;
+await $`ffmpeg -i ${video} \
+               -vf ${`select='${filter}',setpts=N/FRAME_RATE/TB`} \
+               -af ${`aselect='${filter}',asetpts=N/SR/TB`} \
+               ${video + ".cut.mp4"}`;
 
 // let ffmpeg_args = [];
 // const parts = [];
@@ -117,72 +114,3 @@ pieces.push(current_piece);
 // await $`ffmpeg -f concat -safe 0 -i /tmp/vdlist.txt -c copy -y ${
 //   video + "final.mp4"
 // } `;
-
-function range(n) {
-  return [...Array(n).keys()];
-}
-
-for (let piece of pieces) {
-  console.log(piece);
-}
-
-const ns = range(pieces.length);
-
-const sample_rate = parseInt(
-  (
-    await $`ffprobe ${video} 2>&1 | grep 'Audio:' | grep --only-matching --extended-regexp '[0-9]+ Hz' | sed 's/ Hz//'`
-  ).stdout
-); // in Hz
-
-const samples_per_frame = sample_rate / FRAMERATE;
-
-function generateSplit(pieces, prefix = "") {
-  return `[0] ${prefix}split=${pieces.length} ${ns
-    .map((n) => `[copy${n}${prefix}]`)
-    .join("")}`;
-}
-
-function generateFilter(pieces, prefix = "") {
-  return pieces
-    .map(
-      (piece, n) =>
-        `[copy${n}${prefix}]${prefix}trim=start_frame=${piece.start}:end_frame=${piece.end},setpts=PTS-STARTPTS [copy${n}t${prefix}]`
-    )
-    .join("; ");
-}
-
-function generateAudioFilter(pieces) {
-  return pieces
-    .map(
-      (piece, n) =>
-        `[copy${n}a]atrim=start_sample=${
-          piece.start * samples_per_frame
-        }:end_sample=${
-          (piece.end + 1) * samples_per_frame
-        },asetpts=PTS-STARTPTS [copy${n}ta]`
-    )
-    .join("; ");
-}
-
-// version with audio, that doesn't work yet:
-// const filter = `${generateSplit(pieces)}; ${generateSplit(
-//   pieces,
-//   "a"
-// )}; ${generateFilter(pieces)}; ${generateAudioFilter(pieces)}; ${ns
-//   .map((n) => `[copy${n}t]`)
-//   .join("")} concat=n=${pieces.length} [out_video]; ${ns
-//   .map((n) => `[copy${n}ta]`)
-//   .join("")} concat=n=${pieces.length} [out_audio]`;
-
-// video-only version
-const audio_filter = `${generateSplit(pieces, "a")}; ${generateAudioFilter(
-  pieces
-)};`;
-
-const filter = `${generateSplit(pieces)}; 
-${generateFilter(pieces)}; 
-${audio_filter} 
-${ns.map((n) => `[copy${n}t][copy${n}ta]`).join(" ")} 
-concat=n=${pieces.length}:v=1:a=1 [out_video] [out_audio]`;
-
-await $`ffmpeg -i ${video} -b:v ${BITRATE}M -filter_complex ${filter} -map '[out_video]' -map '[out_audio]' ${`${video}.cut-complex.mp4`}`;