video-encoding

问题 I am writing a python/django application and it needs to do image manipulation and then combine the images into a video (each image is a frame). Image manipulation is easy. I'm using PIL, but for the convert to video part, I'm stuck. I've found pyffmpeg but that just seems to do decoding of videos to frames, not the other way around. Although I may have missed something. I've also heard that pythonMagick (imagemagick wrapper) can do this, but I can't seem to find anything about encoding in

问题 I'm currently using files here, but I get some errors while testing my program. I just want to see if it fails only with this one or with all other .h264 files. So, are there any other sources where I can download (standard) .h264 sample files for test ? Thanks. 回答1: Option 1: make your own with x264. These are not standard sample files, but you can control which parts of H.264 they use, for example different profile/level/etc, make them I-frame-only, make them have only a particular

问题 I have some H.264-encoded videos which render in HTML5 correctly in the web browser, but do not render correctly on the iPad. When I use a H.264 video I downloaded off the internet, my video renders correctly on the iPad, so it is not an HTML problem. Here is the ffmpeg info about my videos -- My original .mov video: Seems stream 1 codec frame rate differs from container frame rate: 6000.00 (6000/1) -> 30.00 (30/1) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a_video.mp4': Metadata: major_brand :

问题 I have been doing a lot of searching today for C# libraries which will allow me to create H.264 encoded video files. Does anyone know if any such libraries or 3rd party components exist? 回答1: Use ffmpeg. I suggest to run a ffmpeg process directly, like in this sample: http://jasonjano.wordpress.com/2010/02/09/a-simple-c-wrapper-for-ffmpeg/ While the sample doesn't deal with the operation you need, I suggest to adapt it to your needs. 回答2: ffmpeg-sharp is probably a good starting point. 来源：

问题 My general problem is that I need to play and control the speed of a video (no sound) inside a Unity3D world and probably need to control the decoding myself and I have absolutely no idea how to do that efficiently. So any hints in the right direction are welcome. I need to play a video projected on a Material in Unity and I need to control the speed of that video at runtime. As I target mobile devices I cannot use MovieTexture. There are alternatives like e.g. Easy Movie Texture but they do

问题 I am having some issues that I am hoping you will be able to clarify. I have self taught myself a video encoding process similar to Mpeg2. The process is as follows: Split an RGBA image into 4 separate channel data memory blocks. so an array of all R values, a separate array of G values etc. take the array and grab a block of 8x8 pixel data, to transform it using the Discrete Cosine Transform (DCT). Quantize this 8x8 block using a pre-calculated quantization matrix. Zigzag encode the output

问题 I want to encode video using the "Intel® Quick Sync Video H.264 Encoder MFT". If I create IMFSample from system buffers, it works well. Just like following: IMFMediaBuffer *pBuffer = NULL; MFCreateMemoryBuffer(cbSize, &pBuffer); BYTE *pData = NULL; pBuffer->Lock(&pData, NULL, NULL); memcpy(pData, bufferIhaveinYYYYUV format, buffer size); pBuffer->Unlock(); IMFSample *pSample = NULL; MFCreateSample(&pSample); pSample->AddBuffer(pBuffer); Now I'm investigating whether I can feed it

问题 I am filling a Frame with a BGR image for encoding, and I am getting a memory leak. I think I got to the source of the problem but it appears to be a library issue instead. Since FFmpeg is such a mature library, I think I am misusing it and I would like to be instructed on how to do it correctly. I am allocating a Frame using: AVFrame *bgrFrame = av_frame_alloc(); And later I allocate the image in the Frame using: av_image_alloc(bgrFrame->data, bgrFrame->linesize, bgrFrame->width, bgrFrame-

问题 I am filling a Frame with a BGR image for encoding, and I am getting a memory leak. I think I got to the source of the problem but it appears to be a library issue instead. Since FFmpeg is such a mature library, I think I am misusing it and I would like to be instructed on how to do it correctly. I am allocating a Frame using: AVFrame *bgrFrame = av_frame_alloc(); And later I allocate the image in the Frame using: av_image_alloc(bgrFrame->data, bgrFrame->linesize, bgrFrame->width, bgrFrame-

问题 I'm trying to play movies on the Android device from our server. It is not a media server, just a regular Apache server. We use the same API to access the videos on the iPhone and it works fine. On the Android device, certain videos work, and others do not. They were all created the same way, except the majority of the ones that don't work are composed of still images and audio. We have tried re-encoding them with Videora, and tried hinting them with MP4Box. All of the videos play perfectly