使用ASS字幕+视频模板，实现图文转视频，实现标题样式，翻页，控制行高，渐出动画。中文无法自动换行。

article-to-video-subtitle.ass

[Script Info]
Title: Test
Synch Point: 0
ScriptType: v4.00+
Timer: 100.0000
ScaledBorderAndShadow: no
YCbCr Matrix: TV.601
WrapStyle: 0
PlayResX: 720
PlayResY: 1280

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, Outline,OutlineColour, Bold, ScaleX, ScaleY, Alignment, MarginL, MarginV, Encoding
Style: TITLE,Microsoft YaHei,55,&H00FFFFFF,0,&H80FFFFFF,1,100,100,1,60,950,134
Style: BODY,Microsoft YaHei,55,&H11FFFFFF,0,&H80000000,1,100,100,7,110,450,134

[Events]
Format: Layer, Start, End, Style, Text
Dialogue: 0,0:00:00.50,0:00:30.00, *TITLE,农业农村部：全国秋粮收获\N{\fs10}\h{\r}\N超六成、近八亿亩
Dialogue: 0,0:00:01.00,0:00:04.50, *BODY,{\clip(0,0,720,500)\t(0,2000,\clip(0,0,720,1280))}据央视新闻客户端，农业农\N{\fs10}\h{\r}\N村部最新农情调度显示，全\N{\fs10}\h{\r}\N国秋粮已收获7.85亿亩、\N{\fs10}\h{\r}\N完成60.1%，进度同比快\N{\fs10}\h{\r}\N2.4个百分点。分地区看，\N{\fs10}\h{\r}\N西北地区收获近八成，西南\N{\fs10}\h{\r}\N地区过七成半，黄淮海地区
Dialogue: 0,0:00:04.75,0:00:08.25, *BODY,{\clip(0,0,720,500)\t(0,2000,\clip(0,0,720,1280))}过六成半，东北地区近六成，\N{\fs10}\h{\r}\N长江中下游及华南地区过五\N{\fs10}\h{\r}\N成。

slice_page.py

# 切分新闻稿件与分页脚本
# 因为ass中文不能自动换行，需要手动分页与换行，一个使用例子

import re

word_end = set("，,。.、\\；;：:…%~？?！!”’）】》 !),.:;?]}¨·ˇˉ―‖’”…∶、。〃々〉》」』】〕〗！＂＇），．：；？］｀｜｝～￠")
word_start = set("([{·‘“〈《「『【〔〖（．［｛￡￥")

word_size_in_line = 12 # 每行字数
line_end_gap = 1  # 每行的长度gap，弹性伸缩
line_size_in_page = 8 # 每页行数

def texture_text(text):
    # 计算每行长度，数字英文符号算半个
    return len(text) - (len(re.findall(r"[\d.,' \"\[\]\|\\/!?a-z]", text)) // 2)

def split_long_text(text):
    if texture_text(text) <= word_size_in_line:
        yield text
    else:
        start = 0
        while text[start:start + word_size_in_line]:
            yield text[start:start + word_size_in_line]
            start = start + word_size_in_line

def get_text_pages(text):
    for ch in word_end:
        text = text.replace(ch, f"{ch} ")
    for ch in word_start:
        text = text.replace(ch, f" {ch}")
    text_word_list =  re.sub(r"\s+", " ", text).split()
    text_word_list = [t for wd in text_word_list for t in split_long_text(wd)]

    lines = []
    newline = ""
    for word in text_word_list:
        if texture_text(newline + word) <= word_size_in_line - line_end_gap:
            # 有多余空格, 则直接加入，继续处理下一个词
            if texture_text(word) == 1 and not newline:
                # 单个符号，插入上一行
                lines[-1] += word
            else:
                newline += word
        elif texture_text(newline + word) <= word_size_in_line:
            # 刚好，直接加入，另起一行
            lines.append(newline + word)
            newline = ""
        else:
            # 超过一行
            line_space_len = word_size_in_line - texture_text(newline)
            word_head = word[:line_space_len]
            word_tail = word[line_space_len:]
            if not newline:
                lines.append(word_head)
                newline = word_tail
            else:
                if texture_text(word_tail) == 1:
                    # 多一个符号，插入上一行
                    lines.append(newline + word)
                    newline = ""
                else:
                    # 超过很多，新起一行
                    lines.append(newline + word_head)
                    newline = word_tail
    if newline:
        lines.append(newline)

    pages = []
    start = 0
    while lines[start:start + line_size_in_page]:
        pages.append(lines[start:start+line_size_in_page])
        start += line_size_in_page
    if len(pages) > 1:
        if len(pages[-1]) == 1:
            # 最后一页只有1行，则合并到前一页
            lastpage = pages.pop()
            pages[-1] += lastpage
        else:
            if len(pages[-1]) == 2:
                # 最后一页只有2行，则前一页后移一行
                pages[-1].insert(0, pages[-2].pop())
    return [r"\N{\fs10}\h{\r}\N".join(pg) for pg in pages]

def parse_time(time_in_sec):
    hour = int(time_in_sec) // 3600
    minute = (int(time_in_sec) % 3600) // 60
    second = int(time_in_sec) % 60
    microsec = int(time_in_sec * 100) % 100
    return f"{hour:02}:{minute:02}:{second:02}.{microsec:02}"

ass_file_head = """[Script Info]
Title: Test
Synch Point: 0
ScriptType: v4.00+
Timer: 100.0000
ScaledBorderAndShadow: no
YCbCr Matrix: TV.601
WrapStyle: 0
PlayResX: 720
PlayResY: 1280

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, Outline,OutlineColour, Bold, ScaleX, ScaleY, Alignment, MarginL, MarginV, Encoding
Style: TITLE,Microsoft YaHei,55,&H00FFFFFF,0,&H80FFFFFF,1,100,100,1,60,950,134
Style: BODY,Microsoft YaHei,55,&H11FFFFFF,0,&H80000000,1,100,100,7,110,450,134

[Events]
Format: Layer, Start, End, Style, Text
"""
def create_video(title, content):
    tmp_ass_file = f"./tmp/{title}"

    title, = get_text_pages(title)
    content_page = get_text_pages(content)

    page_show_time = 3.5
    page_gap_time = 0.25
    video_duration = (page_show_time + page_gap_time) * len(content_page) - page_gap_time
    
    ass_file_body = ass_file_head + "Dialogue: 0,%s,%s, *TITLE,%s\n" % (parse_time(0.5), parse_time(video_duration), title)

    page_begin_time = 1
    for content in content_page:
        ass_file_body += "Dialogue: 0,%s,%s, *BODY,{\\clip(0,0,720,500)\\t(0,2000,\\clip(0,0,720,1280))}%s\n" % \
            (parse_time(page_begin_time), parse_time(page_begin_time + page_show_time), content)
        page_begin_time += page_show_time + page_gap_time

    with open(f"{tmp_ass_file}.ass", "w") as f:
        f.write(ass_file_body)
    print(f"ffmpeg -i ./background.mp4 -y -t {video_duration} -vf 'subtitles={tmp_ass_file}.ass' {tmp_ass_file}.mp4")

if __name__ == '__main__':
    for line in open("./data"):
        title, content = line.strip().split("\t")
        if len(title) > 40:
            print(f"标题过长, {title}")
        create_video(title, content)

start.md

start a demo

ffmpeg -i ./background.mp4 -y -t 8 -vf "subtitles=./article-to-video-subtitle.ass" out.mp4

a output demo