我将视频从m4v、flv转换为 MP4, 用于 iPhone、iPod、iPad。
我使用以下命令转换这些视频
ffmpeg -y -i video_1336500693.m4v -vcodec libx264 -vpre slow -vpre ipod640 -b 250k -bt 50k -acodec libfaac -ab 56k -ac 2 -s 480x320 video_1336500693.mp4
此 mp4 文件的视频部分运行正常, 但音频不正常 。 我正为此使用 HTML 5 。
音频头8至10秒有效,但音频后不起作用,奇怪的是,如果我往前跳或往后跳,音频工作就会发生故障。
有没有人能说明出了什么问题?
命令略微修改完成此任务 。 我添加了 < code> - ar 48000 , 它有效
ffmpeg -y -i video_1336500693.m4v -vcodec libx264 -vpre slow -vpre ipod640 -b 250k -bt 50k -acodec libfaac -ac 2 -ar 48000 -ab 64k -s 480x320 video_1336500693.mp4
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