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V2EX    yuetian    全部回复第 1 页 / 共 1 页
回复总数  2
2023-01-08 00:48:11 +08:00
回复了 woctordho 创建的主题 北京大学 北大树洞最新地址 pkuhollow.com
pkuhollow 还能注册吗？输完邮箱提示要验证码，但没收到任何邮件
2021-05-27 09:57:44 +08:00
回复了 zhouweiluan 创建的主题 FFmpeg 求问关于 ffmpeg 烧录硬字幕的时间线问题。
vf 烧录字幕时会把字幕文件和视频流时间轴零点对齐，可以先调字幕文件时间轴，然后烧录，比如下面这两行，只给第 2 分钟的视频烧录字幕，

$ ffmpeg -itsoffset -00:01:00 -i rawsub.ass -map 0 -c ass sub.ass
$ ffmpeg -ss 00:01:00 -to 00:02:00 -i rawvideo.mp4 -map 0 -filter:v ass=f=sub.ass -c:v h264 -c:a copy video.mp4
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