FFmpeg修剪精度低 [英] FFmpeg low trim accuracy

问题描述

因此，我试图将1分29秒的视频切成30秒的片段.预期输出为30sec，30sec，29sec.结果是35sec，29sec，23sec.

So, I'm trying to cut a 1 minute 29 seconds video into clips of 30 seconds each. The expected output is 30sec,30sec,29sec. The result is 35sec,29sec,23sec.

这是我的代码-

 ArrayList<String> commandList = new ArrayList<>();
            commandList.add("-ss");
            commandList.add("00:00:00");
            commandList.add("-i");
            commandList.add(videoPath);
            commandList.add("-c");
            commandList.add("copy");
            commandList.add("-f");
            commandList.add("segment");
            commandList.add("-segment_time");
            commandList.add("00:00:30");
            commandList.add(TEST.getAbsolutePath());
            String[] command  = commandList.toArray(new String[commandList.size()]);
            execFFmpegBinary(command);

知道我在做什么错吗?我在某处读到，如果在特定位置不存在关键帧，它将试图找到最接近的关键帧的位置.

Any idea what I'm doing wrong? I read somewhere that if at a particular position a keyframe doesn't exists it seeks to position of the nearest keyframe.

任何解决方案或指南都会对我有所帮助.预先谢谢你.

Any solution or guidance will help me. Thank you in advance.

推荐答案

FFmpeg将在关键帧上开始分段.使用-编解码器复制时，没有转码，因此它必须使用现有的关键帧.30秒没有关键帧，因此它会在下一个剪切.

FFmpeg will start segments on keyframes. When using -codec copy there is no transcode, so It must use the existing keyframes. There is no keyframe at 30s, so it cuts at the next one.

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