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• Android ffmpeg command shows java.io.IOException : Error running exec()

  26 mai 2023, par Jamal

  I would like to use ffmpeg binary executable in my Android project.for this purpose I have used pre built ffmpeg Android binary from this(https://github.com/hiteshsondhi88/ffmpeg-android/releases/download/v0.3.3/prebuilt-binaries.zip) link.

  



  As per procedure I have to place the executable file into /data/data/com.example.rampedsample directory, here com.example.rampedsample is my project packageName.I couldn't find this location in my device as it is un rooted.So I pasted that executable into Android emulator's com.example.rampedsample directory using DDMS perspective.

  



  In my Activity used the below code

  



   try {
            Process p = Runtime.getRuntime().exec("/data/data/com.example.rampedsample/ffmpeg "+Environment.getExternalStorageDirectory()+"/Movies/ramp_video.mp4"
                    +" -map 0:v -codec copy "+Environment.getExternalStorageDirectory()+"/Movies/ramp_video2.mp4");


        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


  



  AndroidManifest permission

  



  


  



  error

  



  04-13 16:59:55.314: W/System.err(11387): java.io.IOException: Error running exec(). Command: [/data/data/com.example.rampedsample/ffmpeg, /mnt/sdcard/Movies/ramp_video.mp4, -map, 0:v, -codec, copy, /mnt/sdcard/Movies/ramp_video2.mp4] Working Directory: null Environment: null
04-13 16:59:55.314: W/System.err(11387):    at java.lang.ProcessManager.exec(ProcessManager.java:211)
04-13 16:59:55.355: W/System.err(11387):    at java.lang.Runtime.exec(Runtime.java:168)
04-13 16:59:55.355: W/System.err(11387):    at java.lang.Runtime.exec(Runtime.java:241)
04-13 16:59:55.355: W/System.err(11387):    at java.lang.Runtime.exec(Runtime.java:184)
04-13 16:59:55.355: W/System.err(11387):    at com.example.rampedsample.MainActivity.onCreate(MainActivity.java:18)
04-13 16:59:55.355: W/System.err(11387):    at android.app.Activity.performCreate(Activity.java:5008)
04-13 16:59:55.355: W/System.err(11387):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)


  


• ffplay shows no video from Grass Valley KMX in HDMI input even though HDMI from scope bars displays just fine

  14 juin 2023, par Scott Wilkerson

  I'm trying to replace an unsupported video input player that uses a Decklink card to superimpose video on an iControl widget. I was able to get this to work with a Decklink Mini Recorder 4K card with ffplay using this command :

  


  ffplay -f dshow -video_size 1280x720 -left 631 -top 19 -rtbufsize 702000k -framerate 59.94 -i video="Decklink Video Capture":audio="Decklink Audio Capture" -noborder -hide_banner -alwaysontop

  


  I used bars and tone from a handheld scope to test the video window and it worked great. When I put it into production with input from a Grass Valley KMX it only displays black. I can see the video, chroma, audio etc in the video window stats. The KMX video can display just fine with the Black Magic Media Express app. Any ideas what might be tripping it up ?

  


  I tried -videoinput HDMI, which did not work.

  


• Pass individual frames as BGRA byte array and set the timestamps via pipe to FFmpeg

  30 juillet 2023, par Nicke Manarin

  I have a set of images (as BGRA byte[]) with their respective timestamps in milliseconds and I want to pass it to FFmpeg to build an animation.

  


  I'm using FFmpeg v6 right now and in this example I'm expecting a GIF as output, but I'm going to export to multiple formats later.

  


  var arguments = "-vsync passthrough  
-f rawvideo 
-pix_fmt bgra 
-video_size {width}x{height} 
-i -  
-loop 0 
-lavfi palettegen=stats_mode=diff[pal],[0:v][pal]paletteuse=new=1:dither=sierra2_4a:diff_mode=rectangle 
-f gif 
-y \"C:\Users\User\Desktop\test.gif\"";

var process = new Process
{
    StartInfo = new ProcessStartInfo
    {
        FileName = "./ffmpeg.exe",
        Arguments = arguments.Replace("{width}", width.ToString()).Replace("{height}", height.ToString()),
        RedirectStandardInput = true,
        RedirectStandardOutput = true,
        UseShellExecute = false,
        CreateNoWindow = true
    }
};

_process.Start();



  


  Then on my render loop, I'm trying to send the frames and their timestamps one by one.

  


  public void EncodeFrame(IntPtr bufferAddress, int bufferStride, int width, int height, int index, long timestamp, int delay)
{
    var frameSize = height * bufferStride;
    var frameBytes = new byte[frameSize];
    System.Runtime.InteropServices.Marshal.Copy(bufferAddress, frameBytes, 0, frameSize);

    _process.StandardInput.BaseStream.Write(frameBytes, 0, frameSize);
    _process.StandardInput.BaseStream.Write(_delimiter, 0, _delimiter.Length);
    _process.StandardInput.BaseStream.Write(BitConverter.GetBytes(timestamp), 0, sizeof(long));
}


  


  The issue is that I'm getting an IOException (The pipe has been ended), so probably I'm not sending the frames correctly (not sending the delimiter and timestamp doesn't help).

  


  Is this even possible ?