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ffmpeg 视频裁剪无效太大

tag-icon • tag-icon ffmpeg java android
ffmpeg 视频裁剪无效太大

这与视频中的问题是相同的ffmpeg 裁剪：‘宽度无效，过大或非正值’

尝试将视频裁剪为 9:16 的宽高比，检索到的视频大小为宽度 3840 高度 2160，但宽度“3836”或高度“2160”的尺寸无效，太大或为非正值

命令：

I/System.out: "-y" "-ss" "0" "-t" "31" "-i" "/storage/emulated/0/Download/20210227_175547.mp4" "-strict" "experimental" "-vf" "crop=w=3837:h=2160:x=1:y=-2070" "-r" "15" "-ab" "128k" "-vcodec" "mpeg4" "-acodec" "copy" "-b:v" "2500k" "-sample_fmt" "s16" "-ss" "0" "-t" "31" "/storage/emulated/0/VEditor/VideoCroper/20210227_175547-0-13.mp4"

Java代码：

  StringBuilder sb = new StringBuilder();

            sb.append("crop=w=");
            sb.append(this.final_width);
            sb.append(":h=");
            sb.append(this.final_height);
            sb.append(":x=");
            sb.append(this.horizontal);
            sb.append(":y=");
            sb.append(this.vertical);
            a(new String[]{"-y", "-ss", Start, "-t", Duration, "-i",file_name, "-strict", "experimental", "-vf",sb.toString(), "-r", "15", "-ab", "128k", "-vcodec", "mpeg4", "-acodec", "copy", "-b:v", "2500k", "-sample_fmt", "s16", "-ss", "0", "-t", this.Duration, Output}, Output);

答案1

由于旋转侧数据，ffmpeg 会自动旋转视频，因此在裁剪之前视频会变成 2160x3840，从而导致错误。您可以使用-noautorotate输入选项告诉它不要自动旋转。

I/System.out: "-y" "-noautorotate" "-ss" "0" "-t" "31" "-i" "/storage/emulated/0/Download/20210227_175547.mp4" "-vf" "crop=w=3837:h=2160:x=1:y=-2070" "-r" "15" "-vcodec" "mpeg4" "-acodec" "copy" "-b:v" "2500k" "/storage/emulated/0/VEditor/VideoCroper/20210227_175547-0-13.mp4"

我删除了没有任何作用的选项。

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