libavcodec

From wiki , I read that FFmpeg is a free software project that produces libraries and programs for handling multimedia data. The most notable parts of FFmpeg are libavcodec, an audio/video codec library used by several other projects, libavformat, an audio/video container mux and demux library, and the ffmpeg command line program for transcoding multimedia files. So ffmpeg is a wrapper of avcodec? And I often hear that people encode video with x264 using ffmpeg. So ffmpeg is also a wrapper of x264? How are they related ? First of all, to clear up some terms: FFmpeg is a software project with

I'm using libavcodec (latest git as of 3/3/10) to encode raw pcm to aac (libfaac support enabled). I do this by calling avcodec_encode_audio repeatedly with codec_context->frame_size samples each time. The first four calls return successfully, but the fifth call never returns. When I use gdb to break, the stack is corrupt. If I use audacity to export the pcm data to a .wav file, then I can use command-line ffmpeg to convert to aac without any issues, so I'm sure it's something I'm doing wrong. I've written a small test program that duplicates my problem. It reads the test data from a file,

I'm currently trying to read small video files sent from a server In order to read a file using libavformat, you are supposed to call av_open_input_file(&avFormatContext, "C:\\path\\to\\video.avi", 0, 0, 0); The problem is that in this case the file is not on the disk, but in memory. What I'm doing for the moment is downloading the file, writing it on the disk using a temporary name, and then calling av_open_input_file with the temporary file name, which is not a very clean solution. In fact what I want is a function like av_open_custom(&avFormatContext, &myReadFunction, &mySeekFunction); but

I set profile_idc, level_idc, extradata et extradata_size of AvCodecContext with the profile-level-id et sprop-parameter-set of the SDP. I separate the decoding of Coded Slice, SPS, PPS and NAL_IDR_SLICE packet : Init: uint8_t start_sequence[]= {0, 0, 1}; int size= recv(id_de_la_socket,(char*) rtpReceive,65535,0); Coded Slice : char *z = new char[size-16+sizeof(start_sequence)]; memcpy(z,&start_sequence,sizeof(start_sequence)); memcpy(z+sizeof(start_sequence),rtpReceive+16,size-16); ConsumedBytes = avcodec_decode_video(codecContext,pFrame,&GotPicture,(uint8_t*)z,size-16+sizeof(start_sequence))

I am receiving a h264 stream where I at least know the size of one frame. The stream is coming in right as I can store it in a file and playback with vlc. Playing back a file is no problem for me as I include the libavformat. But libavformat gives me back an AVPacket which I can directly give to avcodec_decode_video2. In this case I got a bytestream. How can I give the raw h264 stream to the avcodec_decode_video2? How can I wrap my data into a AVPacket. VLC does not need to guess any data. It is more or less easy to decode a stream. This code is working perfect for me: class