feat(video): add video upload with remux/transcode playback

Add video as a media kind in photos: streaming upload with per-kind limits, ffprobe metadata, poster frame reusing the image variant pipeline, and a playback object (remux when web-compatible, else h264/yuv420p/aac transcode). Video jobs run on a separate pool with a long lease. Frontend gains a video viewer, grid badge/duration and video upload.
2026-10-11 20:37:53 +03:00
parent d059d042f0
commit d38ede0201
52 changed files with 2717 additions and 82 deletions
@@ -0,0 +1,70 @@
+package video
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+// RemuxArgs builds the ffmpeg arguments for a lossless copy into a faststart
+// mp4. Streams are limited to the first video and optional first audio track;
+// subtitles and extra tracks are dropped so players do not stumble on them.
+func RemuxArgs(in, out string) []string {
+	return []string{
+		"-hide_banner", "-nostdin", "-y",
+		"-i", in,
+		"-map", "0:v:0", "-map", "0:a:0?",
+		"-c", "copy",
+		"-movflags", "+faststart",
+		out,
+	}
+}
+
+// TranscodeArgs builds the ffmpeg arguments for a browser-safe h264/aac mp4.
+// The video is scaled to fit maxLongSide without upscaling and forced to
+// even dimensions; ffmpeg applies display rotation during re-encoding.
+func TranscodeArgs(in, out string, maxLongSide int) []string {
+	scale := fmt.Sprintf(
+		"scale=w='min(%d,iw)':h='min(%d,ih)':force_original_aspect_ratio=decrease:force_divisible_by=2",
+		maxLongSide, maxLongSide)
+	return []string{
+		"-hide_banner", "-nostdin", "-y",
+		"-i", in,
+		"-map", "0:v:0", "-map", "0:a:0?",
+		"-c:v", "libx264", "-preset", "veryfast", "-crf", "23",
+		"-pix_fmt", "yuv420p", "-vf", scale,
+		"-c:a", "aac", "-b:a", "128k",
+		"-movflags", "+faststart",
+		out,
+	}
+}
+
+// PosterArgs builds the ffmpeg arguments to extract a single poster frame at
+// atSecond, already scaled so downstream image pipelines decode a bounded frame.
+func PosterArgs(in, out string, atSecond int) []string {
+	scale := fmt.Sprintf("scale=w='min(%d,iw)':h=-2", MaxLongSide)
+	return []string{
+		"-hide_banner", "-nostdin", "-y",
+		"-ss", strconv.Itoa(atSecond),
+		"-i", in,
+		"-frames:v", "1",
+		"-vf", scale,
+		"-f", "image2",
+		out,
+	}
+}
+
+// Run executes ffmpeg with the given arguments and returns an error carrying
+// the captured stderr on failure.
+func Run(ctx context.Context, ffmpegPath string, args ...string) error {
+	cmd := exec.CommandContext(ctx, ffmpegPath, args...)
+	var errb bytes.Buffer
+	cmd.Stderr = &errb
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("ffmpeg %s: %w: %s", strings.Join(args, " "), err, strings.TrimSpace(errb.String()))
+	}
+	return nil
+}