quicktime h264

read Buf length int decodelen; // decoder return length int piclen; // decoder returns image length int piccount; // output image count public: void ffmpeg_decoder_init (); // initialize void ffmpeg_decoder_show (avframe * pframe, int width, int height); // display the image void ffmpeg_decoder_close (); // close }; Define the three functions declared in the class Void ffmpeg_decoder: ffmpeg_decoder_init () {avcodec_register_all (); // register the codecs av_init_packet ( avpkt); // initializ

IX h264 RTP transmission details (1) In the previous chapters, the introduction to the server has a very important issue that has not been carefully explored: how to open a file and obtain its SDP information. Let's start from here. When the rtspserver receives a DESCRIBE request to a media set, it finds the corresponding servermediasession and calls servermediasession: generatesdpdescription (). In generatesdpdescription (), all servermediasubsessio

(millisecond) * 7 (frame display sequence) * Frame Rate Method 2: pic_order_cnt_lsb is recorded in each slice information, and the display sequence of the current frame in this group is recorded. With this pic_order_cnt_lsb, you can directly calculate the PTS of the current frame. This method does not require frame caching. Calculation formula: PTS = 1000 * (I _frame_counter + pic_order_cnt_lsb) * (time_scale/num_units_in_tick) I _frame_counter is the frame sequence of the last I frame position

The MP4 recording program is modified according to the mpeg4ip-1.5.0.1 \ Server \ mp4live \ file_mp4_recorder.cpp file in mpeg4ip. The program supports h264 + AAC (raw stream) writing method, using the dynamic library mp4v2-2.0.0, do not use the older version of mpeg4ip, because it will be efficient when recording large files, the following describes some mp4v2 interfaces. Mp4filehandle mp4create (const char * filename, uint32_t flags)Function: Creat

H264 RTP Header Parsing ProcessCombined with naldecoder. c Analysis Protocol Analysis: Each RTP datagram consists of the header and payload. The meaning of the first 12 bytes of the header is fixed, the load can be audio or video data. The parameter set of the active sequence remains unchanged in the same encoding video sequence, and the parameter set of the active image remains unchanged in the same encoding image. H.264The encoder must set

H264 specifies three major grades, each of which supports a specific set of encoding functions and a specific class of applications. 1. Baseline profile: The I-and p-slices support intra-and inter-frame encoding and context-based adaptive variable-length encoding (cavlc ). It is mainly used for real-time video communication, such as videophone, conference TV, and wireless communication. 2. Main profile: supports video interlace, B-frame encoding,

units (FUS ).0 1 2 30 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 4 5 6 7 8 9 0 1+- +-+| Fu indicator | fu header |+-+ ||| Fu payload ||| +-+|:... Optional RTP padding |+- +-+ Figure 14. RTP payload format for FU-A The fu indicator octet has the following format: + --------------- +| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |+-+| F | NRI | type |+ --------------- + The fu header has the following format: + --------------- +| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |+-+| S | E | r | type |+ --------------- + 3. SDP

Source code of the h264 decoder, port the h264 decoding part of FFMPEG to Android, perform in-depth deletion optimization, and pass the verification in the simulator (320x480. ProgramJNI architecture. The interface, file reading, and video display are all made in Java. The underlying video decoding uses C to meet the speed requirements. In this version, the nal is split from the

In the previous article, I talked about how to use JNI for h264 encoding, but the efficiency is not very practical. After several days of hard work, refer to the real-time coding problem of Android with reference to http://www.javaeye.com/problems/27244. Two important classes: mediarecorder parcelfiledescriptor Mediarecorder is a collection encoding class provided by Android, while parcelfiledescriptor is a class that uses Socket to implement setout

When FFMPEG was recently used for h264 encoding, it was found that the video encoding was delayed, rather than real-time Encoding. After some research, we found thatAvcodec_open2Function When encoder is enabled, SetAvdictionaryThe key code is as follows: Avcodec_open2 function: int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options); Solution: Avdictionary * Param = NULL; // h26