Recording Video on Android from Bitmap

[psandmen]

Hi,
I have done the follow stuff.

            rec = new FFmpegFrameRecorder(VideoName, NativeWebcam.DEFAULT_IMAGE_WIDTH, NativeWebcam.DEFAULT_IMAGE_HEIGHT, 1);
            rec.setFrameRate(15);               
            rec.setPixelFormat(0);

            rec.start();

 on Draw Canvas, I do

                    videoBitmap.copyPixelsToBuffer(ipImage.getByteBuffer());
                    rec.record(ipImage);

 

The result is a video. But the Framerate is wrong. The player I try, plays all to fast.
At first, I start with framerate 30, and the I try the Framerate 15.
But, that's doesnt work better.

So, how can I reach the correct framerate?
Normal, I get from the video device ~30fps.

Thanks for you help.
Peter

[Samuel Audet]

Hi,

You're probably getting variable frame rates, and in that case we need
to specify the timestamps manually with setTimestamp(). Check inside the
RecordActivity.java sample for an example of that:
http://code.google.com/p/javacv/source/browse/samples/RecordActivity.java

Samuel

[psandmen]

Samuel, Thanks.
That works.

[Meghal Adesra]

Hello ,

I want to have video from the set of images lets say 20 images,
so for that can I use the file FFmpegFrameRecorder and I need the sound to be embedded to it.

so please help in this as I am stuck from a week into what to use to make video from a set of images I have searched a lot but didnt find a good to go so I am asking this question here.

[Samuel Audet]

Hello,

On 03/07/2014 07:34 PM, Meghal Adesra wrote:
> I want to have video from the set of images lets say 20 images,
> so for that can I use the file FFmpegFrameRecorder and I need the sound to be embedded to it.
>
> so please help in this as I am stuck from a week into what to use to make video from a set of images I have searched a lot but didnt find a good to go so I am asking this question here.

If you want to create a video from images, there is a sample for that here:
http://code.google.com/p/javacv/source/browse/samples/RecordActivity.java

Do you have any issues with that sample?

Samuel

[Meghal Adesra]

Hello ,

It seems that it will create video from the camera images.

But actually I want to capture the screen as an video so therefore I was thinking of taking screenshots of the screen and create an video of that screenshots.

do you have any source for what I need to do ?

will try out this link and see if I can modify it to my needs.

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Thanks & Regards

Meghal Adesra

www.makkinfotech.com

India : +91 7878027137

[Samuel Audet]

On 03/10/2014 10:51 PM, Meghal Adesra wrote:
> It seems that it will create video from the camera images.
>
> But actually I want to capture the screen as an video so therefore I was
> thinking of taking screenshots of the screen and create an video of that
> screenshots.
>
> do you have any source for what I need to do ?
> will try out this link and see if I can modify it to my needs.

I don't have anything ready made, no, but it's apparently possible to
capture the screen through the framebuffer with FFmpeg, and thus with
FFmpegFrameGrabber. Some details here:
http://code.google.com/p/javacv/issues/detail?id=429

Samuel

[Meghal Adesra]

Hello ,

Framebuffer requires root and ffmpeg requires NDK.

can I have some solution with the sdk itself

Samuel

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[Samuel Audet]

On 03/10/2014 11:07 PM, Meghal Adesra wrote:
> Hello ,
>
> Framebuffer requires root and ffmpeg requires NDK.
>
> can I have some solution with the sdk itself
>

Well, it looks like we can get Bitmap objects:
http://stackoverflow.com/questions/12462944/how-to-take-a-screenshot-of-other-app-programmatically-without-root-permission

So we can convert that to IplImage, something like that:
https://groups.google.com/forum/#!topic/javacv/jxr-1URgM6M

and save it to with FFmpegFrameGrabebr (no, it doesn't require the NDK)

Samuel

[Meghal Adesra]

Thanks for the help will surely look into the resources you provided and let you know if there is any issue

thanks a lot for the help

Samuel

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[Meghal Adesra]

Hello ,

thanks for the help and I have done the first two things but again got stuck at the third :

1.

Well, it looks like we can get Bitmap objects
http://stackoverflow.com/questions/12462944/how-to-take-a-screenshot-of-other-app-programmatically-without-root-permission

2.

So we can convert that to IplImage, something like that:
https://groups.google.com/forum/#!topic/javacv/jxr-1URgM6M

3.

and save it to with FFmpegFrameGrabebr (no, it doesn't require the NDK)

how to save the iplimage file that I get through th FFmpegFrameGraber ?

thanks

www.makkinfotech.com

India : +91 7878027137

[Samuel Audet]

Hello,

On 04/12/2014 11:35 PM, Meghal Adesra wrote:
> and save it to with FFmpegFrameGrabebr (no, it doesn't require the NDK)
>
> how to save the iplimage file that I get through th FFmpegFrameGraber ?

I meant FFmpegFrameRecorder, sorry. Check the Demo class in the
README.txt file for an example of how to use it.

Samuel

[Meghal Adesra]

 recorder.setCodecID( CODEC_ID_H263);
        recorder.setFormat("3gp");
        recorder.setPixelFormat(  PIX_FMT_YUV420P);
        recorder.start();

I am getting an error in setCodecID an dsetPixelFormat

can I know why can this happen ?

Samuel

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Thanks & Regards

Meghal Adesra

www.makkinfotech.com

India : +91 7878027137

[Samuel Audet]

On 04/13/2014 09:55 PM, Meghal Adesra wrote:
> | recorder.setCodecID( CODEC_ID_H263);
> recorder.setFormat("3gp");
> recorder.setPixelFormat( PIX_FMT_YUV420P);
> recorder.start();
>
> |
>
> |I am getting an error in setCodecID an dsetPixelFormat
> |
>
> |can I know why can this happen ?|

Have you tried AV_CODEC_ID_H263 and AV_PIX_FMT_YUV420P?

[Meghal Adesra]

When I tried to convert Bitmap to IplImage in Javacv Android app, I got an error: "Buffered not large enough for pixels"..

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[Meghal Adesra]

Hello ,

I am doing as mentioned below want to create a video from the image:

FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("/sdcard/test.mp4",256,256);
        try {
            recorder.setVideoCodec(avcodec.AV_CODEC_ID_MPEG4);
            recorder.setFormat("mp4");
            recorder.setFrameRate(30);
//            recorder.setPixelFormat(3);
            recorder.setPixelFormat(avutil.PIX_FMT_YUV420P10);
            recorder.setVideoBitrate(1200);
            recorder.startUnsafe();
//            recorder.start();
            for (int i=0;i< 5;i++)
              {
                recorder.record(image);
              }
            recorder.stop();
           }
        catch (Exception e){
            e.printStackTrace();
          }

but I am getting the below mentioned exception and no video file is created.


04-19 15:42:39.550: W/System.err(16761): com.googlecode.javacv.FrameRecorder$Exception: avcodec_open2() error -22: Could not open video codec.
04-19 15:42:39.550: W/System.err(16761):     at com.googlecode.javacv.FFmpegFrameRecorder.startUnsafe(FFmpegFrameRecorder.java:492)

[Samuel Audet]

On 04/14/2014 02:26 AM, Meghal Adesra wrote:
> When I tried to convert Bitmap to IplImage in Javacv Android app, I got an error: "Buffered not large enough for pixels"..

That means exactly what it says: Make the buffer (image) bigger.

Samuel

[Meghal Adesra]

Hello

I solved this issue but now when I am trying to put audio in it the both are not in sync ?

[Samuel Audet]

On 04/19/2014 07:22 PM, Meghal Adesra wrote:
> recorder.setPixelFormat(avutil.PIX_FMT_YUV420P10);

I don't think the MPEG4 supports that format. You should try with
AV_PIX_FMT_YUV420P instead.

Samuel

[Samuel Audet]

On 04/22/2014 08:32 PM, Meghal Adesra wrote:
> Hello
>
> I solved this issue but now when I am trying to put audio in it the both
> are not in sync ?
>

You could try to reduce the bitrate, maybe your CPU isn't powerful enough.

Samuel

[Meghal Adesra]

I got the example of the audio from the RecordActivity.java of java samples

and the making the bitmaps and video from that bitmaps from the link you gave

and when I tried to do both it seems to be lagging in the voice ,

I tried to capture both differently different file for audio and different file for video and than saw the time of  both and the time of both varies.

video is of 8 seconds and audio of 11seconds.

so I changed the bitrate from 120000 to 70000 and it was same.

what do you say should I reduce it more ?

Samuel

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[Samuel Audet]

On 04/22/2014 10:37 PM, Meghal Adesra wrote:
> I got the example of the audio from the RecordActivity.java of java samples
> and the making the bitmaps and video from that bitmaps from the link you
> gave and when I tried to do both it seems to be lagging in the voice ,
>
> I tried to capture both differently different file for audio and
> different file for video and than saw the time of both and the time of
> both varies.
>
> video is of 8 seconds and audio of 11seconds.
>
> so I changed the bitrate from 120000 to 70000 and it was same.
> what do you say should I reduce it more ?

Yes, and you could also try to use x264 and it's "ultrafast" preset by
making these calls:

recorder.setVideoCodec(AV_CODEC_ID_H264);
recorder.setVideoOption("preset", "ultrafast");

Samuel

[Meghal Adesra]

but if i a using recorder.setVideoCodec(AV_CODE

C_ID_H264);

I am getting an error "cannot open video codec"

Samuel

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[Samuel Audet]

On 04/28/2014 07:32 AM, Meghal Adesra wrote:
> but if i a using recorder.setVideoCodec(AV_CODEC_ID_H264);
> I am getting an error "cannot open video codec"

Please try again with a more recent version of JavaCV, as it happens,
the just released version 0.8, thanks!

Samuel

[e.iva...@gmail.com]

Hi, 

I'm using JavaCV v.0.8, when i try to youse FFmpegFrameRecorder with 

        recorder.setVideoCodec(AV_CODEC_ID_H264);

        recorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P);

        recorder.setFormat("mp4");

I get the following error  avcodec_open2() error -1 

[Samuel Audet]

Could you try again with JavaCV 0.9? Thanks!

Samuel

[Meghal Adesra]

Hello ,

I have used it only once and used in this way
hope it helps you.

videoAudiorecorder.setVideoBitrate(20000);
videoAudiorecorder.setFormat("mp4");
videoAudiorecorder.setSampleRate(sampleAudioRateInHz);
videoAudiorecorder.setFrameRate(2);

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