broken ffmpeg default settings detected

问题:

I am getting broken ffmpeg error while VideoWrite using X264 Fourcc codec.I have install all the dependencies.How can I rectify this problem.The sample code that I have been using is as follows.

VideoWriter oVideoWriter ("path.mp4", CV_FOURCC('X','2','6','4'), 15, frameSize, false);

Operating system : Ubuntu 14.04 64-bit

Console Error:

[libx264 @ 0x8d6220] broken ffmpeg default settings detected
[libx264 @ 0x8d6220] use an encoding preset (e.g. -vpre medium)
[libx264 @ 0x8d6220] preset usage: -vpre <speed> -vpre <profile>
[libx264 @ 0x8d6220] speed presets are listed in x264 --help
[libx264 @ 0x8d6220] profile is optional; x264 defaults to high
Could not open codec 'libx264': Unspecified errorOpenCV Error: Unsupported format or combination of formats (Your version of Gstreamer doesn't support this codec acutally or needed plugin missing.) in CvVideoWriter_GStreamer::open, file /home/mbox140/Development/opencv-2.4.9/modules/highgui/src/cap_gstreamer.cpp, line 518
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/mbox140/Development/opencv-2.4.9/modules/highgui/src/cap_gstreamer.cpp:518: error: (-210) Your version of Gstreamer doesn't support this codec acutally or needed plugin missing. in function CvVideoWriter_GStreamer::open

Suggest me any solution for this.

回答1:

for the error:

[libx264 @ 0x8d6220] broken ffmpeg default settings detected
[libx264 @ 0x8d6220] use an encoding preset (e.g. -vpre medium)
[libx264 @ 0x8d6220] preset usage: -vpre <speed> -vpre <profile>
[libx264 @ 0x8d6220] speed presets are listed in x264 --help
[libx264 @ 0x8d6220] profile is optional; x264 defaults to high

you may need the command -vpre perset (e.g. -vpre fast). maybe you libx264 is too old. I meet the same error while using a ffmpeg built in 2014.

回答2:

I don't remember if you need to re build opencv with open h264 support, but for sure, standart opencv doesn't provide h264 codec. Here is a hint:

http://answers.opencv.org/question/104346/how-to-encode-a-h264-video-on-windows/

回答3:

please install libx264-dev and try compiling openvc3.0 with that. follow this link