h.264

问题 I followed this post to decode my h264 video stream frames. My data frames as bellow: My code: NSString * const naluTypesStrings[] = { @"0: Unspecified (non-VCL)", @"1: Coded slice of a non-IDR picture (VCL)", // P frame @"2: Coded slice data partition A (VCL)", @"3: Coded slice data partition B (VCL)", @"4: Coded slice data partition C (VCL)", @"5: Coded slice of an IDR picture (VCL)", // I frame @"6: Supplemental enhancement information (SEI) (non-VCL)", @"7: Sequence parameter set (non-VCL

问题 I followed this post to decode my h264 video stream frames. My data frames as bellow: My code: NSString * const naluTypesStrings[] = { @"0: Unspecified (non-VCL)", @"1: Coded slice of a non-IDR picture (VCL)", // P frame @"2: Coded slice data partition A (VCL)", @"3: Coded slice data partition B (VCL)", @"4: Coded slice data partition C (VCL)", @"5: Coded slice of an IDR picture (VCL)", // I frame @"6: Supplemental enhancement information (SEI) (non-VCL)", @"7: Sequence parameter set (non-VCL

问题 I followed this post to decode my h264 video stream frames. My data frames as bellow: My code: NSString * const naluTypesStrings[] = { @"0: Unspecified (non-VCL)", @"1: Coded slice of a non-IDR picture (VCL)", // P frame @"2: Coded slice data partition A (VCL)", @"3: Coded slice data partition B (VCL)", @"4: Coded slice data partition C (VCL)", @"5: Coded slice of an IDR picture (VCL)", // I frame @"6: Supplemental enhancement information (SEI) (non-VCL)", @"7: Sequence parameter set (non-VCL

问题 I am trying to tweak the attributes of the H.264 encoder created via ActivateObject() by retrieving the ICodecAPI interface to it. Although I do not get errors, my settings are not taken into account. Code runs under Windows 10. I copy the code I use to create the IMFSinkWriter and retrieve the ICodecAPI below. Error handling not shown, but no error are produced. I have read this thread which implies that tweaking the encoder used by IMFSinkWriter may not be possible, but since there's no

问题 I am trying to tweak the attributes of the H.264 encoder created via ActivateObject() by retrieving the ICodecAPI interface to it. Although I do not get errors, my settings are not taken into account. Code runs under Windows 10. I copy the code I use to create the IMFSinkWriter and retrieve the ICodecAPI below. Error handling not shown, but no error are produced. I have read this thread which implies that tweaking the encoder used by IMFSinkWriter may not be possible, but since there's no

问题 I want to encode Desktop Duplication API frames to send over the network after encoding them with Media Foundation. I'm stuck with a E_NOTIMPL error when I call IMFTransform::ProcessInput, leaving me a little in the dark. These are the steps I've done up until now, I'm detailing them because it took me days to gather everything from the scarce scattered info across the web, so if it's resolved it will hopefully help others. Everything below is met with an S_OK: I'm obtaining the surface

问题 I want to encode Desktop Duplication API frames to send over the network after encoding them with Media Foundation. I'm stuck with a E_NOTIMPL error when I call IMFTransform::ProcessInput, leaving me a little in the dark. These are the steps I've done up until now, I'm detailing them because it took me days to gather everything from the scarce scattered info across the web, so if it's resolved it will hopefully help others. Everything below is met with an S_OK: I'm obtaining the surface

问题 I encode h264 data by libavcodec. ex. while (1) { ... avcodec_encode_video(pEnc->pCtx, OutBuf, ENC_OUTSIZE, pEnc->pYUVFrame); ... } If I directly save OutBuf data as a .264 file, it can`t be play by player. Now I want to save OutBuf as a mp4 file. Anyone know how to do this by ffmpeg lib? thanks. 回答1: You use avformat_write_header , av_interleaved_write_frame , avformat_write_trailer and friends. Their usage is shown in the muxing example of FFmpeg. See a similar topic: Raw H264 frames in

问题 Edit: In the previous version I used a very old ffmpeg API. I now use the newest libraries. The problem has only changed slightly, from "Main" to "High". I am using the ffmpeg C API to create a mp4 video in C++. I want the resulting video to be of the profile "Constrained Baseline", so that the resulting video can be played on as much platforms as possible, especially mobile, but I get "High" profile every time, even though I hard coded the codec profile to be FF_PROFILE_H264_CONSTRAINED

问题 I have an h264 video file that is loaded into memory, and I attempt to play it with imem using the parameter "imem-cat=4" so that vlc will use an access module to demux the video, and vlc starts and receives my imem parameters successfully: [0x7f38a0000e28] access_imem demux debug: Using get(0x404e1d), release(0x404e91), data(0x7fff5b4a9430), cookie("IMEM") This category also means I don't have to provide DTS and PTS. The imem module for VLC isn't well documented, but I've found hints in