FFMPEGFrameRecorder example

[rpgomes]

Hello,

I'm experiment to use FFMPEGFrameRecorder to record the stream that I capture to a file,
the requirement is to make a mjpeg file,
but when I try to start the recording I get an

org.bytedeco.javacv.FrameRecorder$Exception: avcodec_open2() error -22: Could not open video codec.

my code:

FFmpegFrameRecorder ffr = new FFmpegFrameRecorder("myFile.mp4",dim.getWidth(),dim.getHeight(), 0);
            ffr.setFormat("mjpeg");
            ffr.setVideoCodec(8);//MJPEG I think
            try {
                ffr.start();
            } catch (org.bytedeco.javacv.FrameRecorder.Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

What I'm doing wrong, can someone give me some parametrization pointers?

[saudet]

I don't think there is such a thing as the "mjpeg" format. It's not in the list returned by ffmpeg -formats anyway, so call av_oformat_next() in a loop to make sure it's in the list.

[saudet]

Oh, actually it's in the list. I get this error message in the log:

Error: [mjpeg @ 0x7f56980ac200] Specified pixel format yuv420p is invalid or not supported

So simply call setPixelFormat() with a supported pixel format such as AV_PIX_FMT_YUVJ420P before start().

[rpgomes]

Ok,

with the setPixelFormat(avutil.AV_PIX_FMT_YUVJ420P);
I managed to start.

I'm making some mjpeg experiemnts, and I configured an FFserver and test with success with the ffmpeg directly:

ffmpeg -rtsp_transport tcp -i "rtsp://root:pass@IP/axis-media/media.amp" -vcodec mjpeg http://ffserverIP:8090/feed1.ffm

and managed to play in an html< IMG> tag

I'm trying to do the same with FfmpegFrameRecorder:
my code:

ffr = new FFmpegFrameRecorder("http://" + "FFSERVER_IP"  + ":" + 8090 + "/feed1.ffm",dim.getWidth(),dim.getHeight(), 0);
            ffr.setFormat("mjpeg");
            ffr.setVideoCodec(8);//MJPEG
            ffr.setPixelFormat(avutil.AV_PIX_FMT_YUVJ420P);

            try {
                ffr.start();
            } catch (org.bytedeco.javacv.FrameRecorder.Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

this return this output:

Output #0, mjpeg, to 'http://192.168.0.69:8090/feed1.ffm':
    Stream #0:0: Video: mjpeg, yuvj420p, 352x288, q=2-31, 400 kb/s, 5 tbn, 5 tbc

but when I record the frame:

try {
                            ffr.record(f);
                        } catch (org.bytedeco.javacv.FrameRecorder.Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }

I get this exception:

org.bytedeco.javacv.FrameRecorder$Exception: av_write_frame() error -10054 while
 writing video frame.
        at rg.bytedeco.javacv.FFmpegFrameRecorder.recordImage(FFmpegFrameRecorder.java:800)
        at org.bytedeco.javacv.FFmpegFrameRecorder.record(FFmpegFrameRecorder.java:686)
        at org.bytedeco.javacv.FFmpegFrameRecorder.record(FFmpegFrameRecorder.java:679)

Did I need to make more configuration in FFMPEGFrameRecorder?

[saudet]

Check the log, it's going to contain more information.

[saudet]

BTW, issue #267 might be related.

[rpgomes]

Sorry I didn't understand what log should I check ? and where is it?
the log I post was from the JVM

[saudet]

What do you get as output after the following?

Output #0, mjpeg, to 'http://192.168.0.69:8090/feed1.ffm':
    Stream #0:0: Video: mjpeg, yuvj420p, 352x288, q=2-31, 400 kb/s, 5 tbn, 5 tbc

[rpgomes]

That is all I'm getting as output from javacv when I making the ffmpeframerecorder.start().

Then I get the error on recording the frame.

using ffmpeg directly I get this output:

Output #0, ffm, to 'http://192.168.0.69:8090/feed1.ffm':
  Metadata:
    title           : Media Presentation
    creation_time   : 2016-05-19 12:25:39
    encoder         : Lavf57.3.100
    Stream #0:0: Video: mjpeg, yuvj420p(pc), 352x288 [SAR 16:11 DAR 16:9], q=2-3
1, 64 kb/s, 25 fps, 1000k tbn, 5 tbc
    Metadata:
      encoder         : Lavc57.5.100 mjpeg
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))

[saudet]

So, you want to use the ffm format, right? You're not going to get that if you call setFormat("mjpeg")...

[rpgomes]

yep that make the trick,
you're the best :)

Thanks

[saudet]

FYI, if the ffmpeg program is sufficient, with commit bytedeco/javacpp-presets@13ffffd it now gets bundled and can be used easily from Java.