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• Modifying CISCO openh264 to take image frames and out compressed frames

  16 mai 2017, par Khurram Amin

  Has anyone tried to modify the CISCO openh264 library to take JPEG images as input and compress them into P and I frames (output as frames, NOT video) and similarly to modify decoder to take compressed P and I frames and generate uncompressed-frames ?

  I have a camera looking at a static scene and taking pictures (1280x720p) every 30 second. The scene is almost static. Currenlty I am using JPEG compression to compress each frame individually and it is resulting in an image size of ~270KB. This compressed frame is transferred via internet to a storage server. Since there is very little motion in the scene, the 'I' frame size will be very small (I think it should be ~20-50KB). So it will be very cost effective to transmit I frames over internet instead of JPEG images.

  Can anyone guide me to some project or about how to proceed with this task ?

• Modifying CISCO openh264 to take image frames and out compressed frames

  16 mai 2017, par Khurram Amin

  Has anyone tried to modify the CISCO openh264 library to take JPEG images as input and compress them into P and I frames (output as frames, NOT video) and similarly to modify decoder to take compressed P and I frames and generate uncompressed-frames ?

  I have a camera looking at a static scene and taking pictures (1280x720p) every 30 second. The scene is almost static. Currenlty I am using JPEG compression to compress each frame individually and it is resulting in an image size of ~270KB. This compressed frame is transferred via internet to a storage server. Since there is very little motion in the scene, the 'I' frame size will be very small (I think it should be ~20-50KB). So it will be very cost effective to transmit I frames over internet instead of JPEG images.

  Can anyone guide me to some project or about how to proceed with this task ?

• ffmpeg transcode from h.264 to h.264 sometimes fail

  15 mai 2017, par frodeborli

  I have set up a streaming server, and I am making the server transcode the incoming stream to alternative bitrates.

  I have discovered that when clients send h264 video, sometimes the resulting stream fails. If the client instead sends VP8 encoded video, the resulting output is fine. It seems as if the video is only being partially transcoded when going from h264 to h264.

  How can I force ffmpeg to fully decode the incoming video, frame by frame - then encode it again - without having clients send inferior VP8-video?

• ffmpeg x264 CPU core scaling

  12 mai 2017, par alex416

  Does anyone have any experence with this type of thing? Currently using a Ryzen 7 8c/16T CPU, and using a program called BES. Using 10% CPU, is almost no slower at transcoding from mkv to mp4 (both x264, i know i can just copy them) than using 100% cpu on all 16 threads. So, Since this is the case, What is the ideal core count for libx264? I mean, Does the same type of thing happen with 32 threads? Or 8 threads, etc.

• Finding x264 coeffecients

  10 mai 2017, par Artemiy Gorodilov

  I'm newbe in programming and video codek. I'm trying to Eject DCT coeffecients after quantization. I'm using x264 codec with this sourses http://www.videolan.org/developers/x264.html How can I find this coeffecients to change it for testing watermark.