Leak_Technologies/VideoTools
Leak_Technologies/VideoTools
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Clamp snippet bitrates and block lossless for short clips

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This commit is contained in:
Stu Leak 2025-12-17 16:19:24 -05:00
parent ce5ad6e7fa
commit ec967d50e7
1 changed files with 32 additions and 3 deletions
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35
main.go
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@ -3712,6 +3712,31 @@ func (s *appState) executeSnippetJob(ctx context.Context, job *queue.Job, progre
center := math.Max(0, src.Duration/2-halfLength)
start := fmt.Sprintf("%.2f", center)
clampSnippetBitrate := func(bitrate string, width int) string {
val := strings.TrimSpace(strings.ToLower(bitrate))
val = strings.TrimSuffix(val, "bps")
val = strings.TrimSuffix(val, "k")
n, err := strconv.ParseFloat(val, 64)
if err != nil || n <= 0 {
n = 3500
}
capKbps := 5000.0
if width >= 3840 {
capKbps = 30000
} else if width >= 1920 {
capKbps = 15000
} else if width >= 1280 {
capKbps = 8000
}
if n > capKbps {
n = capKbps
}
if n < 800 {
n = 800
}
return fmt.Sprintf("%.0fk", n)
}
var args []string
if useSourceFormat {
@ -3792,12 +3817,12 @@ func (s *appState) executeSnippetJob(ctx context.Context, job *queue.Job, progre
}
// Apply video codec settings with bitrate/CRF caps to avoid runaway bitrates on short clips
targetBitrate := strings.TrimSpace(conv.VideoBitrate)
targetBitrate := clampSnippetBitrate(strings.TrimSpace(conv.VideoBitrate), src.Width)
if targetBitrate == "" {
targetBitrate = defaultBitrate(conv.VideoCodec, src.Width, src.Bitrate)
targetBitrate = clampSnippetBitrate(defaultBitrate(conv.VideoCodec, src.Width, src.Bitrate), src.Width)
}
if targetBitrate == "" {
targetBitrate = "3500k"
targetBitrate = clampSnippetBitrate("3500k", src.Width)
}
preset := conv.EncoderPreset
@ -3812,6 +3837,10 @@ func (s *appState) executeSnippetJob(ctx context.Context, job *queue.Job, progre
crfVal = "23"
}
}
// Disallow lossless for snippets to avoid runaway bitrates
if strings.TrimSpace(crfVal) == "0" {
crfVal = "18"
}
videoCodec := strings.ToLower(conv.VideoCodec)
switch videoCodec {