How to compress existing mp4 video with javacv/ffmpeg ??? plz help :)

[elbarid...@gmail.com]

[Samuel Audet]

Hello,

Just do as shown with the Demo class found in the README.txt file, but
replace the "output.avi" filename with something that ends with ".mp4",
and that's it.

Samuel

[elbarid...@gmail.com]

while reading the demo class in readme file i see that framegraber grabes image, and framerecorder records them .

fine but where does the audio in the output file takes place?

 

my purpose is to compress an HD video lets say 50mb to like 5 mb.

 

Regards! 

[elbarid...@gmail.com]

thanks to ur support am able to compress the video but not with the audio.

any hint to grab the audio ?? :)

 

Regards my friend

[Samuel Audet]

On 03/19/2013 11:25 PM, elbarid...@gmail.com wrote:
> thanks to ur support am able to compress the video but not with the audio.
>
> any hint to grab the audio ?? :)

Something like this should work:

FrameGrabber grabber = new FFmpegFrameGrabber("input.mp4");
grabber.start();
FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("output.mp4",
grabber.getImageWidth(), grabber.getImageHeight(),
grabber.getAudioChannels());
recorder.setFrameRate(grabber.getFrameRate());
recorder.setSampleRate(grabber.getSampleRate());
recorder.start();
Frame frame;
while ((frame = grabber1.grabFrame()) != null) {
recorder.record(frame);
}
recorder.stop();
grabber.stop();

Samuel

[elbarid...@gmail.com]

Dear Samuel,

 

now I am able to compress the video along with the audio! I was traveling for a while and now I came back!

I have a problem though it is driving me crazy!

 

On all htc , the compression of the video along with the audio works great

I am using the following code:

 

FrameRecorder recorder=

new FFmpegFrameRecorder(newfullpath, 240, 320,1);

 

recorder.setAudioCodec(avcodec.

AV_CODEC_ID_AAC);

recorder.setFrameRate(grabber.getFrameRate());

recorder.setSampleRate(grabber.getSampleRate());

recorder.setVideoCodec(avcodec.

AV_CODEC_ID_MPEG4);

 

 

Although, On all Samsung devices (not mentioning I have tons of trouble with camera intent also) , the audio after compression is distorted and freaky.!!!!!

I tried setting audiobitrate and sample rate with no result!!!

Please advice! ur the best :)

On Thursday, March 14, 2013 12:05:38 PM UTC+2, elbarid...@gmail.com wrote:

[elbarid...@gmail.com]

For whom it may concern,

 

I found the solution of the distorted sound in Samsung.

 

HTC records mp4 with audio aac but 1 channel while Samsung records mp4 with audio aac 2 channels .

 

welcome! :P

 

 

another problem whith Samsung I am having and I hope Samuel replies :

after click save video from intent.mediastore.capture_video , the activity result is not started and the app crashes saying unable to start activity with null point exception.

 

I thing the problem is related to the fact that when u launch media intent from Samsung , the activity is forced rotated to landscape  so when I click save video the activity is recreated and it crashes ! I don't have this problem on htc devices

 

I am trying to put debug breakpoints on the start of activity they are never called!

 

I tried setting config:scrrensize,keyboard,orientatiion in manifest along with orientation : portrait but also nothing.

 

weird thing is that sometimes on Samsung it works activity result gets called and sometimes not!

 

appreciate advice from anyone!

 

Regards samuel

[Samuel Audet]

On 05/16/2013 07:08 PM, elbarid...@gmail.com wrote:
> For whom it may concern,
> I found the solution of the distorted sound in Samsung.
> HTC records mp4 with audio aac but 1 channel while Samsung records mp4
> with audio aac 2 channels .
> welcome! :P

Great! Thanks for letting us know

> another problem whith Samsung I am having and I hope Samuel replies :
> after click save video from intent.mediastore.capture_video , the
> activity result is not started and the app crashes saying unable to
> start activity with null point exception.
> I thing the problem is related to the fact that when u launch media
> intent from Samsung , the activity is forced rotated to landscape so
> when I click save video the activity is recreated and it crashes ! I
> don't have this problem on htc devices
> I am trying to put debug breakpoints on the start of activity they are
> never called!
> I tried setting config:scrrensize,keyboard,orientatiion in manifest
> along with orientation : portrait but also nothing.
> weird thing is that sometimes on Samsung it works activity result gets
> called and sometimes not!
> appreciate advice from anyone!

Well, Android isn't exactly a paragon of stability. I'm afraid you'll
have to figure out what works exactly with your particular phone model.

Sounds like threading issue though. Make sure all the threads remain in
a consistent state.

Samuel