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当我在 ubuntu 14.04 上通过 java 执行时，某些 ffmpeg 命令无法正常工作

tag-icon • tag-icon linux command-line video ffmpeg java
当我在 ubuntu 14.04 上通过 java 执行时，某些 ffmpeg 命令无法正常工作 
When I execute ffmpeg command through java code then It is not executing properly 
Example-:

我想通过 java 代码在视频中绘制文字

我的 Java 代码是

String cmd="ffmpeg -i 12213blob.mp4 -vf \"drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf:text='Text to write':fontsize=20:fontcolor=black:x=250:y=430\" output.mp4";
            System.out.println(cmd);
            Process p4 = Runtime.getRuntime().exec(cmd);
            p4.waitFor();

        BufferedReader stdInput = new BufferedReader(new
             InputStreamReader(p4.getInputStream()));

        BufferedReader stdError = new BufferedReader(new
             InputStreamReader(p4.getErrorStream()));

        // read the output from the command
        System.out.println("Here is the standard output of the command:\n");
        while ((s = stdInput.readLine()) != null) {
            System.out.println(s);
        }

        // read any errors from the attempted command
        System.out.println("Here is the standard error of the command (if any):\n");
        while ((s = stdError.readLine()) != null) {
            System.out.println(s);
        }


    }
    catch (IOException e) {
        System.out.println("exception happened - here's what I know: ");
        e.printStackTrace();

    }
}

当我执行此代码时，出现如下错误 这是命令的标准输出：

这是该命令的标准错误（如果有）：

ffmpeg version 2.4.git Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep 16 2014 18:19:21 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --prefix=/home/deepak/ffmpeg_build --extra-cflags=-I/home/deepak/ffmpeg_build/include --extra-ldflags=-L/home/deepak/ffmpeg_build/lib --bindir=/home/deepak/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '12213blob.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.48.100
  Duration: 00:00:09.94, start: 0.046440, bitrate: 593 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 660x500 [SAR 1:1 DAR 33:25], 493 kb/s, 42.83 fps, 42.83 tbr, 16448 tbn, 85.67 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 96 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
**[NULL @ 0x302bd40] Unable to find a suitable output format for 'to'
to: Invalid argument**

但是当我直接在终端上执行此命令时，它就能正确执行

答案1

String cmd="ffmpeg -i 12213blob.mp4 -vf drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf:text=Text-to-write:fontsize=20:fontcolor=black:x=250:y=430 output.mp4";

@user2511474：试试上面的命令，它会起作用。我最近遇到了类似的问题，通过删除“转义引号”和空格解决了它。

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