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Head down (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Multiple Dialogue lines of an ASS subtitle file is displayed at the same time on the video file
14 janvier 2024, par Furkan GözükaraI am trying to code an ASS subtitle burner.


Converting given SRT file into ASS subtitle


Let me show examples


Below is given SRT file - generated with Whisper


1
00:00:00,000 --> 00:00:00,080
<u>American</u> XL Bully Dog

2
00:00:00,080 --> 00:00:00,640
American <u>XL</u> Bully Dog

3
00:00:00,640 --> 00:00:01,140
American XL <u>Bully</u> Dog

4
00:00:01,140 --> 00:00:01,280
American XL Bully <u>Dog</u>

5
00:00:01,280 --> 00:00:01,520
<u>is</u> a danger to

6
00:00:01,520 --> 00:00:01,640
is <u>a</u> danger to

7
00:00:01,640 --> 00:00:01,800
is a <u>danger</u> to

8
00:00:01,800 --> 00:00:02,220
is a danger <u>to</u>

9
00:00:02,220 --> 00:00:02,380
<u>our</u> communities, particularly our

10
00:00:02,380 --> 00:00:02,680
our <u>communities,</u> particularly our

11
00:00:02,680 --> 00:00:03,360
our communities, particularly our

12
00:00:03,360 --> 00:00:03,580
our communities, <u>particularly</u> our

13
00:00:03,580 --> 00:00:04,060
our communities, particularly <u>our</u>

14
00:00:04,060 --> 00:00:04,280
<u>children.</u>


Then this above SRT file is converted into the below ASS subtitle


[Script Info]
ScriptType: v4.00+
PlayResX: 384
PlayResY: 288

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,16,&H00FFFFFF,&H0000FF00,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,1,0,2,10,10,10,1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,00:00:00.000,00:00:00.080,Default,,0,0,0,,{\c&H00FF00&}American{\c&HFFFFFF&} XL Bully Dog
Dialogue: 0,00:00:00.080,00:00:00.640,Default,,0,0,0,,American {\c&H00FF00&}XL{\c&HFFFFFF&} Bully Dog
Dialogue: 0,00:00:00.640,00:00:01.140,Default,,0,0,0,,American XL {\c&H00FF00&}Bully{\c&HFFFFFF&} Dog
Dialogue: 0,00:00:01.140,00:00:01.280,Default,,0,0,0,,American XL Bully {\c&H00FF00&}Dog{\c&HFFFFFF&}
Dialogue: 0,00:00:01.280,00:00:01.520,Default,,0,0,0,,{\c&H00FF00&}is{\c&HFFFFFF&} a danger to
Dialogue: 0,00:00:01.520,00:00:01.640,Default,,0,0,0,,is {\c&H00FF00&}a{\c&HFFFFFF&} danger to
Dialogue: 0,00:00:01.640,00:00:01.800,Default,,0,0,0,,is a {\c&H00FF00&}danger{\c&HFFFFFF&} to
Dialogue: 0,00:00:01.800,00:00:02.220,Default,,0,0,0,,is a danger {\c&H00FF00&}to{\c&HFFFFFF&}
Dialogue: 0,00:00:02.220,00:00:02.380,Default,,0,0,0,,{\c&H00FF00&}our{\c&HFFFFFF&} communities, particularly our
Dialogue: 0,00:00:02.380,00:00:02.680,Default,,0,0,0,,our {\c&H00FF00&}communities,{\c&HFFFFFF&} particularly our
Dialogue: 0,00:00:02.680,00:00:03.360,Default,,0,0,0,,our communities, particularly our
Dialogue: 0,00:00:03.360,00:00:03.580,Default,,0,0,0,,our communities, {\c&H00FF00&}particularly{\c&HFFFFFF&} our
Dialogue: 0,00:00:03.580,00:00:04.060,Default,,0,0,0,,our communities, particularly {\c&H00FF00&}our{\c&HFFFFFF&}
Dialogue: 0,00:00:04.060,00:00:04.280,Default,,0,0,0,,{\c&H00FF00&}children.{\c&HFFFFFF&}


Both when playing the subtitle in any video player or burning into video via FFMPEG, what happens is, multiple Dialogue lines are being displayed at the same time on the screen.


I am doing a lot of research regarding this but still couldn't find out the issue.


Here screenshot of what I mean. So how can I fix this issue ? What is wrong with my ASS file format ?




Here below the functio that I am use to generate that ASS format


def convert_srt_to_ass(srt_content):
 # ASS header
 ass_header = (
 "[Script Info]\n"
 "ScriptType: v4.00+\n"
 "PlayResX: 384\n"
 "PlayResY: 288\n\n"
 "[V4+ Styles]\n"
 "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding\n"
 "Style: Default,Arial,16,&H00FFFFFF,&H0000FF00,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,1,0,2,10,10,10,1\n\n"
 "[Events]\n"
 "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\n"
 )

 ass_content = ass_header
 # Adjust regex to properly capture subtitle number, start time, end time, and text
 matches = list(re.finditer(r'(\d+)\n(\d{2}:\d{2}:\d{2},\d{3}) --> (\d{2}:\d{2}:\d{2},\d{3})\n(.+?)\n\n', srt_content, re.DOTALL))

 prev_end = None
 
 for match in matches:
 start, end, text = match.group(2), match.group(3), match.group(4)
 start = start.replace(',', '.')
 end = end.replace(',', '.')

 # Calculate the correct start and end times to ensure no overlap
 if prev_end and start <= prev_end:
 # Adjust the previous end time to be a bit before the current start time
 prev_end_time = datetime.strptime(prev_end, '%H:%M:%S.%f')
 adjusted_end_time = prev_end_time - timedelta(milliseconds=100) # Adjust by 100 milliseconds
 prev_end = adjusted_end_time.strftime('%H:%M:%S.%f')[:-3] # Truncate to 3 decimal places

 ass_content = ass_content.rstrip()
 ass_content = re.sub(r'(\d{2}:\d{2}:\d{2}\.\d{3}),Default,,$', f'{prev_end},Default,,', ass_content, 1)
 ass_content += '\n'

 prev_end = end

 # Formatting the text and adding it to the content
 text = text.replace('<u>', '{\\c&H00FF00&}').replace('</u>', '{\\c&HFFFFFF&}')
 text = text.replace('\n', '\\N') # Convert newlines within text for ASS format
 ass_content += f"Dialogue: 0,{start},{end},Default,,0,0,0,,{text}\n"

 
 # Conversion of text and other formatting remains the same

 return ass_content


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avcodec/dxv : Constify slice threads' ptr to main context
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