int len = avcodec_decode_audio4(avCodecContext, pAudioFrame, &gotFrame, &packet); avcodec_decode_audio4就是用来解码packet中的音频数据,pAudioFrame就是存储了解码结果的数据等信息,需要注意的是,gotFrame这个参数,如果调用之后其值为0,所以当前没有解码的数据,但这种情况不能是解码出错,只有返回值小于0时,...
int aac_type = fmt_ctx->streams[audio_stream_index]->codecpar->profile; int channels = fmt_ctx->streams[audio_stream_index]->codecpar->channels; int sample_rate = fmt_ctx->streams[audio_stream_index]->codecpar->sample_rate; 我们知道AAC的头的格式 Structure AAAAAAAA AAAABCCD EEFFFFGH HH...
check_hr(device->CreateTexture(w, h, 1, D3DUSAGE_DYNAMIC, D3DFMT_L16, D3DPOOL_DEFAULT, &texU_, NULL)); //12b U check_hr(device->CreateTexture(w, h, 1, D3DUSAGE_DYNAMIC, D3DFMT_L16, D3DPOOL_DEFAULT, &texV_, NULL)); //12b V check_hr(device->CreateTexture(w, h, 1, D3DUSA...
五、核心代码 boolFFmpegThread::init(){//判断该摄像机是否能联通if(checkConn && isRtsp) {if(!checkUrl(url, checkTime)) {returnfalse; } }//初始化参数this->initOption();//初始化输入if(!initInput()) {returnfalse; }//初始化视频if(!initVideo()) {returnfalse; }//初始化音频if(!initAu...
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options); 1. 该函数的第一个参数即前面的文件句柄,第二个参数也是用于保存无法识别的信息的AVDictionary的结构,通常可设为NULL。调用方式如: /* retrieve stream information */ if (avformat_find_stream_info(va_ctx.fmt_ctx, NULL) < 0...
video audio To include the stream index ffprobe -loglevel error -show_entries stream=index,codec_type -of csv=p=0 input.foo Example result: 0,video 1,audio In this example the video is the first stream and the audio is the second stream which is the norm but not always the case...
* check out & Retrieve the stream information in the file * then populate pFormatCtx->stream with the proper information * pFormatCtx->streams is just an array of pointers, of size pFormatCtx->nb_streams ---*/if(avformat_find_stream_info(pFormatCtx,NULL)<0){return-1;// Couldn't fi...
if (!audioChannel && !videoChannel) { LOGE("没有音视频"); callHelper->onError(THREAD_CHILD, FFMPEG_NOMEDIA); return; } // 准备完了 通知java 你随时可以开始播放 callHelper->onPrepare(THREAD_CHILD); } 核心代码差不多是这些,现在我们可以先测试一下,编译运行会发现报错 报这个错是因为,FFmpeg的...
Also I had to produce wav files as my output. And it had a framesize of 0. so I just chose a number after a few tests I went with 32. I noticed if I went too big (ex 128) I would get audio glitches. Changed the if statement that breaks out of the loop to check nb_samples...
-async audio sync method -adrift_threshold threshold audio drift threshold -copyts copy timestamps -copytb mode copy input stream time base when stream copying -dts_delta_threshold threshold timestamp discontinuity delta threshold -dts_error_threshold threshold timestamp error delta threshold ...