iu
d38ede0201
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.
71 lines
2.1 KiB
Go
71 lines
2.1 KiB
Go
package video
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import (
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"bytes"
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"context"
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"fmt"
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"os/exec"
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"strconv"
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"strings"
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)
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// RemuxArgs builds the ffmpeg arguments for a lossless copy into a faststart
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// mp4. Streams are limited to the first video and optional first audio track;
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// subtitles and extra tracks are dropped so players do not stumble on them.
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func RemuxArgs(in, out string) []string {
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return []string{
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"-hide_banner", "-nostdin", "-y",
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"-i", in,
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"-map", "0:v:0", "-map", "0:a:0?",
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"-c", "copy",
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"-movflags", "+faststart",
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out,
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}
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}
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// TranscodeArgs builds the ffmpeg arguments for a browser-safe h264/aac mp4.
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// The video is scaled to fit maxLongSide without upscaling and forced to
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// even dimensions; ffmpeg applies display rotation during re-encoding.
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func TranscodeArgs(in, out string, maxLongSide int) []string {
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scale := fmt.Sprintf(
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"scale=w='min(%d,iw)':h='min(%d,ih)':force_original_aspect_ratio=decrease:force_divisible_by=2",
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maxLongSide, maxLongSide)
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return []string{
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"-hide_banner", "-nostdin", "-y",
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"-i", in,
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"-map", "0:v:0", "-map", "0:a:0?",
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"-c:v", "libx264", "-preset", "veryfast", "-crf", "23",
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"-pix_fmt", "yuv420p", "-vf", scale,
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"-c:a", "aac", "-b:a", "128k",
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"-movflags", "+faststart",
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out,
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}
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}
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// PosterArgs builds the ffmpeg arguments to extract a single poster frame at
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// atSecond, already scaled so downstream image pipelines decode a bounded frame.
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func PosterArgs(in, out string, atSecond int) []string {
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scale := fmt.Sprintf("scale=w='min(%d,iw)':h=-2", MaxLongSide)
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return []string{
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"-hide_banner", "-nostdin", "-y",
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"-ss", strconv.Itoa(atSecond),
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"-i", in,
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"-frames:v", "1",
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"-vf", scale,
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"-f", "image2",
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out,
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}
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}
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// Run executes ffmpeg with the given arguments and returns an error carrying
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// the captured stderr on failure.
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func Run(ctx context.Context, ffmpegPath string, args ...string) error {
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cmd := exec.CommandContext(ctx, ffmpegPath, args...)
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var errb bytes.Buffer
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cmd.Stderr = &errb
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if err := cmd.Run(); err != nil {
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return fmt.Errorf("ffmpeg %s: %w: %s", strings.Join(args, " "), err, strings.TrimSpace(errb.String()))
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}
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return nil
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}
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