3gp to mp4 with rotation FFmpeg

[Arthur]

Hi,

Been searching the threads but could not find a close reference to my problem.

I was converting 3gp to mp4 using Samuel's poor mans codec. It works great but I've seen some few caveats that I hope somebody has found a solution to this.

Issue:

1. grabber.getFrameRate() somtimes returns wrong value when reading 3gp files (Got 3gp from android that has 7.55 framerate but grabber reports 37.75)

2. Is there a way to read the rotation metadata and put it on the FrameRecorder?

3. recorder.setVideoOption("vf", "transpose=1"); seems to have no effect on the output

Here's the code based on 

FrameGrabber grabber = new FFmpegFrameGrabber(videoFilePath);

                

grabber.start();

               

String fileName = videoFilePath.substring( videoFilePath.lastIndexOf('/')+1, videoFilePath.length() );

String fileNameWithoutExtn = fileName.substring(0, fileName.lastIndexOf('.'));

               

FrameRecorder recorder = new FFmpegFrameRecorder(VIDEO_DUMP_FOLDER_PATH+fileNameWithoutExtn+".mp4", grabber.getImageWidth(), grabber.getImageHeight(), grabber.getAudioChannels());

recorder.setFrameRate(grabber.getFrameRate());

recorder.setSampleFormat(grabber.getSampleFormat());

recorder.setSampleRate(grabber.getSampleRate());

               

recorder.setVideoOption("vf", "transpose=1");  <<-- Added this as debug to see if the video rotates

               

recorder.start();

Frame frame;

while ((frame = grabber.grabFrame()) != null) {

        recorder.record(frame);

}

recorder.stop();

grabber.stop();

Thanks,

Arthur

[Arthur]

I also tried:

#1 recorder.setVideoOption("vf", "vflip");

#2 recorder.setVideoOption("vfilters", "rotate=90");

with no effect on the output.  

[Samuel Audet]

Hello,

On 10/01/2013 12:04 PM, Arthur wrote:
> Hi,
>
> Been searching the threads but could not find a close reference to my
> problem.
>
> I was converting 3gp to mp4 using Samuel's poor mans codec. It works
> great but I've seen some few caveats that I hope somebody has found a
> solution to this.
>
> Issue:
> 1. grabber.getFrameRate() somtimes returns wrong value when reading 3gp
> files (Got 3gp from android that has 7.55 framerate but grabber reports
> 37.75)

Does "ffmpeg" or "ffplay" on the commmand line report the correct
number? If they do, then please post here a small sample file causing
the problem:
http://code.google.com/p/javacv/issues/list
If they do not, then please report the bug upstream to the FFmpeg
developers, thank you

> 2. Is there a way to read the rotation metadata and put it on the
> FrameRecorder?

Most likely. Do you have some sample code in C that we could port?

> 3. recorder.setVideoOption("vf", "transpose=1"); seems to have no effect
> on the output

FFmpegFrameRecorder does not currently use avfilter, so these settings
won't work.. Again, if this something you wish to have, please post an
"issue" here with as much concrete details as possible about the kind of
functionality you are looking for:
http://code.google.com/p/javacv/issues/list
Thank you!

Samuel

[Arthur]

Thank you sir.

I'll have another battery of test and will post them on the bug list, as you've indicated, if the problem is unique to javac.

[Samuel Audet]

Great, thanks! Let me know how that goes

Samuel