Add intro text improvements and BGM download management
- Intro text: Add 0.7s freeze frame effect before video plays - Intro text: Auto-scale font size to prevent overflow - Intro text: Split long text into 2 lines automatically - BGM Page: Add free BGM download section with 6 categories - BGM Page: Support individual and bulk download from Freesound.org 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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kihong.kim
@@ -74,8 +74,11 @@ async def process_video(
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# Build video filter chain
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video_filters = []
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# Note: We no longer use tpad to add frozen frames, as it extends the video duration.
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# Instead, intro text is simply overlaid on the existing video content.
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# 1. Add freeze frame at the beginning if intro text is provided
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# tpad adds frozen frames at start using clone mode (copies first frame)
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if intro_text and intro_duration > 0:
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# Clone the first frame for intro_duration seconds
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video_filters.append(f"tpad=start_duration={intro_duration}:start_mode=clone")
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# 2. Add subtitle overlay if provided
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if subtitle_path and os.path.exists(subtitle_path):
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@@ -89,6 +92,7 @@ async def process_video(
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"/System/Library/Fonts/Supplemental/AppleGothic.ttf", # macOS Korean
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"/System/Library/Fonts/AppleSDGothicNeo.ttc", # macOS Korean
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"/usr/share/fonts/truetype/nanum/NanumGothicBold.ttf", # Linux Korean
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"/usr/share/fonts/truetype/korean/Pretendard-Bold.otf", # Docker Korean
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"/usr/share/fonts/opentype/noto/NotoSansCJK-Bold.ttc", # Linux CJK
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]
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@@ -98,79 +102,82 @@ async def process_video(
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font_file = font.replace(":", "\\:")
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break
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# Adjust font size and split text if too long
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# Shorts video is 1080 width, so ~10-12 chars fit comfortably at 100px
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text_len = len(intro_text)
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adjusted_font_size = intro_font_size
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# Calculate font size based on text length to prevent overflow
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# Shorts video is typically 720px width
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# Korean characters are nearly square (width ≈ height), so char_width_ratio ≈ 1.0
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video_width = 720 # Default Shorts width
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box_padding = 40 # boxborderw=20 on each side
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max_width_ratio = 0.75 # Leave 25% margin for safety
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char_width_ratio = 1.0 # Korean characters are nearly square
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available_width = (video_width * max_width_ratio) - box_padding
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# Split into 2 lines if text is long (more than 10 chars)
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lines = []
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if text_len > 10:
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# Find best split point near middle
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mid = text_len // 2
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split_pos = mid
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for i in range(mid, max(0, mid - 5), -1):
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if intro_text[i] in ' ,、，':
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split_pos = i + 1
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# Split text into 2 lines if too long (more than 10 chars or font would be too small)
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text_len = len(intro_text)
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single_line_font = int(available_width / (text_len * char_width_ratio))
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# Use 2 lines if single line font would be less than 50px
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if single_line_font < 50 and text_len > 6:
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# Find best split point (prefer space near middle)
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mid = len(intro_text) // 2
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split_pos = None
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# Search for space within 5 chars of middle
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for offset in range(6):
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if mid + offset < len(intro_text) and intro_text[mid + offset] == ' ':
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split_pos = mid + offset
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break
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for i in range(mid, min(text_len, mid + 5)):
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if intro_text[i] in ' ,、，':
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split_pos = i + 1
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if mid - offset >= 0 and intro_text[mid - offset] == ' ':
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split_pos = mid - offset
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break
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# If no space found, split at middle
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if split_pos is None:
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split_pos = mid
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line1 = intro_text[:split_pos].strip()
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line2 = intro_text[split_pos:].strip()
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if line2:
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lines = [line1, line2]
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else:
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lines = [intro_text]
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display_text = f"{line1}\\n{line2}"
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# Calculate font size based on longer line
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max_line_len = max(len(line1), len(line2))
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calculated_max_font = int(available_width / (max_line_len * char_width_ratio))
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print(f"[Intro] Split into 2 lines: '{line1}' / '{line2}' (max {max_line_len} chars)")
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else:
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lines = [intro_text]
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display_text = intro_text
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calculated_max_font = single_line_font
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print(f"[Intro] Single line: '{intro_text}' ({text_len} chars)")
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# Adjust font size based on longest line length
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max_line_len = max(len(line) for line in lines)
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if max_line_len > 12:
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adjusted_font_size = int(intro_font_size * 10 / max_line_len)
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adjusted_font_size = max(50, min(adjusted_font_size, intro_font_size)) # Clamp between 50-100
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adjusted_font_size = min(intro_font_size, calculated_max_font)
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adjusted_font_size = max(36, adjusted_font_size) # Minimum 36px font size
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print(f"[Intro] Requested font: {intro_font_size}px, Adjusted: {adjusted_font_size}px")
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# Add fade effect timing
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fade_out_start = max(0.1, intro_duration - 0.3)
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alpha_expr = f"if(gt(t,{fade_out_start}),(({intro_duration}-t)/0.3),1)"
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# Fade out effect timing (fade starts 0.2s before end)
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fade_out_start = max(0.1, intro_duration - 0.2)
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alpha_expr = f"if(gt(t,{fade_out_start}),(({intro_duration}-t)/0.2),1)"
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# Create drawtext filter(s) for each line
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line_height = adjusted_font_size + 20
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total_height = line_height * len(lines)
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escaped_text = display_text.replace("'", "\\'").replace(":", "\\:")
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for i, line in enumerate(lines):
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escaped_text = line.replace("'", "\\'").replace(":", "\\:").replace("\\", "\\\\")
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# Draw text centered on screen during freeze frame
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drawtext_parts = [
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f"text='{escaped_text}'",
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f"fontsize={adjusted_font_size}",
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"fontcolor=white",
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"x=(w-text_w)/2", # Center horizontally
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"y=(h-text_h)/2", # Center vertically
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f"enable='lt(t,{intro_duration})'",
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"borderw=4",
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"bordercolor=black",
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"box=1",
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"boxcolor=black@0.7",
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"boxborderw=20",
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f"alpha='{alpha_expr}'",
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"line_spacing=10", # Add spacing between lines
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]
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# Calculate y position for this line (centered overall)
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if len(lines) == 1:
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y_expr = "(h-text_h)/2"
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else:
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# Center the block of lines, then position each line
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y_offset = int((i - (len(lines) - 1) / 2) * line_height)
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y_expr = f"(h-text_h)/2+{y_offset}"
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if font_file:
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drawtext_parts.insert(1, f"fontfile='{font_file}'")
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drawtext_parts = [
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f"text='{escaped_text}'",
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f"fontsize={adjusted_font_size}",
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"fontcolor=white",
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"x=(w-text_w)/2", # Center horizontally
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f"y={y_expr}",
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f"enable='lt(t,{intro_duration})'",
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"borderw=3",
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"bordercolor=black",
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"box=1",
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"boxcolor=black@0.6",
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"boxborderw=15",
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f"alpha='{alpha_expr}'",
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]
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if font_file:
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drawtext_parts.insert(1, f"fontfile='{font_file}'")
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video_filters.append(f"drawtext={':'.join(drawtext_parts)}")
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video_filters.append(f"drawtext={':'.join(drawtext_parts)}")
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# Combine video filters
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video_filter_str = ",".join(video_filters) if video_filters else None
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