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truewhile
2026-10-21 13:21:13 +08:00
parent 55854a0adb
commit 74487359bf
5 changed files with 311 additions and 4 deletions
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internal/service/transcoder_ffmpeg_args.go
+33 -4
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@@ -16,6 +16,9 @@ type transcodeInput struct {
StartSec float64
SubtitleStream *int
Quality *LocalHLSQuality
// CopyVideo 为 true 时视频流只换封装（-c:v copy），不重编码。
// 仅当源视频是浏览器可解的老三样（H.264/8bit/4:2:0）且不需要缩放时启用。
CopyVideo bool
}
type ffmpegArgSettings struct {
@@ -52,6 +55,7 @@ func buildFFmpegArgsForInput(cfg *config.Config, input transcodeInput, playlist,
// 原画档位不做硬件缩放的兼容处理，直接走软件编码，保持源分辨率。
settings.encoder = ""
}
copyVideo := input.CopyVideo && input.SubtitleStream == nil
video := ffmpegVideoPlanForSettings(settings)
if input.SubtitleStream != nil {
// Bitmap subtitles must be composited in software. Keeping CUDA/QSV/
@@ -60,13 +64,17 @@ func buildFFmpegArgsForInput(cfg *config.Config, input transcodeInput, playlist,
settings.encoder = ""
video = ffmpegVideoPlanForSettings(settings)
}
if copyVideo {
// 直通：不做缩放、不挂滤镜、不选编码器，整条视频流原样塞进 TS。
video = ffmpegVideoPlan{codec: "copy"}
}
// Mid-file restarts must not use -re: output -ss would otherwise crawl to the
// seek point at 1x wall-clock before emitting the first HLS segment.
realtime := settings.realtime && input.StartSec <= 0.05
args := baseFFmpegArgs(video.preInput, realtime)
args = appendInputAndVideoArgs(args, input, settings, video)
args = appendOutputHLSArgs(args, settings, segments, playlist)
args = appendInputAndVideoArgs(args, input, settings, video, copyVideo)
args = appendOutputHLSArgs(args, settings, segments, playlist, copyVideo)
return args
}
@@ -161,7 +169,7 @@ func baseFFmpegArgs(preInput string, realtime bool) []string {
return args
}
func appendInputAndVideoArgs(args []string, input transcodeInput, settings ffmpegArgSettings, video ffmpegVideoPlan) []string {
func appendInputAndVideoArgs(args []string, input transcodeInput, settings ffmpegArgSettings, video ffmpegVideoPlan, copyVideo bool) []string {
args = append(args, ffmpegHTTPInputArgs(input)...)
ss := ""
if input.StartSec > 0.05 {
@@ -172,6 +180,11 @@ func appendInputAndVideoArgs(args []string, input transcodeInput, settings ffmpe
// scrubbing; CDNs with Range support jump via demuxer seek instead.
if ss != "" {
args = append(args, "-ss", ss)
if copyVideo {
// 复制视频流时 ffmpeg 不能解码，精确 seek 会把关键帧之前的分组丢掉，
// 输出从 P 帧开始（花屏）。退到前一个关键帧，最多提前一两秒。
args = append(args, "-noaccurate_seek")
}
}
args = append(args, "-i", input.Source)
if input.SubtitleStream != nil {
@@ -197,7 +210,23 @@ func appendInputAndVideoArgs(args []string, input transcodeInput, settings ffmpe
return args
}
func appendOutputHLSArgs(args []string, settings ffmpegArgSettings, segments, playlist string) []string {
func appendOutputHLSArgs(args []string, settings ffmpegArgSettings, segments, playlist string, copyVideo bool) []string {
if copyVideo {
// 视频是复制进来的，编码参数一律不适用；只保留音频转 AAC 与切片参数。
// -avoid_negative_ts 让带 B 帧的源在 -ss 之后不会出现负时间戳。
return append(args,
"-avoid_negative_ts", "make_zero",
"-c:a", "aac",
"-ar", "48000",
"-b:a", "128k",
"-ac", "2",
"-f", "hls",
"-hls_time", fmt.Sprintf("%d", settings.segmentSeconds),
"-hls_list_size", "0",
"-hls_segment_filename", segments,
playlist,
)
}
return append(args,
"-pix_fmt", "yuv420p",
"-b:v", settings.bitrate,