Error while merging videos(No audio output stream (Is audioChannels > 0 and has start() been called?))

[Ram]

Hi,

       I am getting error while i am trying to merge two videos. How to solve this.I am using javacv 0.9.


11-09 13:38:33.702: W/System.err(2147): org.bytedeco.javacv.FrameRecorder$Exception: No audio output stream (Is audioChannels > 0 and has start() been called?)
11-09 13:38:33.702: W/System.err(2147):     at org.bytedeco.javacv.FFmpegFrameRecorder.record(FFmpegFrameRecorder.java:738)
11-09 13:38:33.712: W/System.err(2147):     at org.bytedeco.javacv.FrameRecorder.record(FrameRecorder.java:293)
11-09 13:38:33.712: W/System.err(2147):     at com.example.videomerging.MainActivity.onCreate(MainActivity.java:39)
11-09 13:38:33.712: W/System.err(2147):     at android.app.Activity.performCreate(Activity.java:4465)
11-09 13:38:33.712: W/System.err(2147):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
11-09 13:38:33.722: W/System.err(2147):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
11-09 13:38:33.722: W/System.err(2147):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
11-09 13:38:33.722: W/System.err(2147):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
11-09 13:38:33.722: W/System.err(2147):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
11-09 13:38:33.722: W/System.err(2147):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-09 13:38:33.732: W/System.err(2147):     at android.os.Looper.loop(Looper.java:137)
11-09 13:38:33.761: W/System.err(2147):     at android.app.ActivityThread.main(ActivityThread.java:4424)
11-09 13:38:33.761: W/System.err(2147):     at java.lang.reflect.Method.invokeNative(Native Method)
11-09 13:38:33.761: W/System.err(2147):     at java.lang.reflect.Method.invoke(Method.java:511)
11-09 13:38:33.761: W/System.err(2147):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-09 13:38:33.772: W/System.err(2147):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-09 13:38:33.772: W/System.err(2147):     at dalvik.system.NativeStart.main(Native Method)

[Ram]

Hi samuel,

        These are the videos i am using to merge.i attached here.among these files,1.mp4 is i am getting from javacv
(i.e images to video conversion).Let me know if any one know the solution.thanks

[Samuel Audet]

On 11/09/2014 05:45 PM, Ram wrote:
> Hi samuel,
>
> These are the videos i am using to merge.i attached here.among
> these files,1.mp4 is i am getting from javacv
> (i.e images to video conversion).Let me know if any one know the
> solution.thanks

Did you try to call setAudioChannels(1 or 2) before calling start()?

And please do not send large files on the mailing list, thank you!

Samuel

[Ram]

Hi samuel,
I have a doubt,I have two videos with different framerate means while I m merging that videos how to set frame rate?

[Samuel Audet]

On 11/15/2014 08:45 PM, Ram wrote:
> Hi samuel,
> I have a doubt,I have two videos with different framerate means while I m merging that videos how to set frame rate?
>

Set the output to the highest frame rate, and `setTimestamp()` to the
right value before calling `record()`. That will get you a variable
frame rate.

Samuel

[Mihael Francekovic]

Hi Samuel,

Could you please explain more how setTimestamp works and why frame rate doesn't matter then?

Thanks,

Mihael

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[Samuel Audet]

On 11/25/2014 04:41 PM, Mihael Francekovic wrote:
> Hi Samuel,
>
> Could you please explain more how setTimestamp works and why frame rate doesn't matter then?

The frame rate does matter. setTimestamp() basically just lets us skip
any number of frames, that's all!

Samuel

[Jibin Sudhakaran]

Hi Samuel,

Me also facing same issue 

No audio output stream (Is audioChannels > 0 and has start() been called?)

02-10 15:18:05.611    3829-3829/com.example.jibin.videpmaker W/System.err﹕ at org.bytedeco.javacv.FFmpegFrameRecorder.record(FFmpegFrameRecorder.java:740)

02-10 15:18:05.611    3829-3829/com.example.jibin.videpmaker W/System.err﹕ at org.bytedeco.javacv.FrameRecorder.record(FrameRecorder.java:293)

Can you help me to figure out the problem. 

Here is my code

FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(Environment

.getExternalStorageDirectory().getPath()

+ System.currentTimeMillis()

+ ".mp4", this.getResources().getDisplayMetrics().widthPixels,

this.getResources().getDisplayMetrics().heightPixels);

// audio grabber

FrameGrabber grabber2 = new FFmpegFrameGrabber(Environment

.getExternalStorageDirectory().getPath() + "/abc.mp3");

grabber2.setAudioChannels(2);

try {

recorder.setVideoCodec(13); // CODEC_ID_MPEG4 //CODEC_ID_MPEG1VIDEO

// //http://stackoverflow.com/questions/14125758/javacv-ffmpegframerecorder-properties-explanation-needed

recorder.setFrameRate(1); 

recorder.setPixelFormat(0); 

recorder.setSampleRate(grabber2.getSampleRate());

recorder.start();

            grabber2.start();

for (int i = 0; i < iplimage.length; i++) {

recorder.record(iplimage[i]);

Frame frame1 = grabber2.grabFrame();

//while (frame1 != null) {

recorder.record(frame1);

break;

//}

}

recorder.stop();

grabber2.stop();

[Samuel Audet]

On 02/10/2015 06:58 PM, Jibin Sudhakaran wrote:
>
> No audio output stream (Is audioChannels > 0 and has start() been called?)

You didn't call FrameRecorder.setAudioChannels(2) or something. Do that
and it should work.

Samuel