以下是代码：这是控制台主要内容 应用程序，代码编译和运行，视频被捕获但不是 音频。
FFmpegBinariesHelper.RegisterFFmpegBinaries();
ffmpeg.av_register_all();
ffmpeg.avcodec_register_all();
ffmpeg.avformat_network_init();
AVFormatContext* context = ffmpeg.avformat_alloc_context();
int video_stream_index = 0;
ffmpeg.av_register_all();
ffmpeg.avcodec_register_all();
ffmpeg.avformat_network_init();
//open rtsp
if (ffmpeg.avformat_open_input(&context, "rtsp://user:pass@IPAddress/axis-media/media.amp?", null, null) != 0)
{
return ;
}
if (ffmpeg.avformat_find_stream_info(context, null) < 0)
{
return;
}
//search video stream
for (int i = 0; i < context->nb_streams; i++)
{
if (context->streams[i]->codec->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
video_stream_index = i;
}
AVPacket packet;
ffmpeg.av_init_packet(&packet);
//open output file
AVOutputFormat* fmt = ffmpeg.av_guess_format("mp4", null, null);
// AVFormatContext* oc = ffmpeg.avformat_alloc_context();
AVFormatContext* oc = null;
ffmpeg.avformat_alloc_output_context2(&oc, fmt, null, null);
oc->oformat = fmt;
ffmpeg.avio_open2(&oc->pb, "test.mp4", ffmpeg.AVIO_FLAG_WRITE, null, null);
AVStream* stream = null;
int cnt = 0;
//start reading packets from stream and write them to file
ffmpeg.av_read_play(context);//play RTSP
while (ffmpeg.av_read_frame(context, &packet) >= 0 && cnt < 1000)
{//read 100 frames
if (packet.stream_index == video_stream_index)
{//packet is video
if (stream == null)
{//create stream in file
stream = ffmpeg.avformat_new_stream(oc, context->streams[video_stream_index]->codec->codec);
ffmpeg.avcodec_copy_context(stream->codec, context->streams[video_stream_index]->codec);
stream->sample_aspect_ratio = context->streams[video_stream_index]->codec->sample_aspect_ratio;
ffmpeg.avformat_write_header(oc, null);
}
packet.stream_index = stream->id;
ffmpeg.av_interleaved_write_frame(oc, &packet);
cnt++;
}
ffmpeg.av_free_packet(&packet);
ffmpeg.av_init_packet(&packet);
}
ffmpeg.av_read_pause(context);
ffmpeg.av_write_trailer(oc);
ffmpeg.avio_close(oc->pb);
ffmpeg.avformat_free_context(oc);
答案 0 :(得分：0)
我找到了添加音频代码的方法，现在音频正在复制并与视频同步。这是代码：
AVFormatContext* ifcx = null;
AVCodecContext* v_iccx = null;
AVCodec* v_icodec = null;
AVStream* v_ist = null;
int v_index;
AVCodecContext* a_iccx = null;
AVCodec* a_icodec = null;
AVStream* a_ist = null;
int a_index;
DateTime timenow, timestart;
AVFormatContext* ofcx;
AVOutputFormat* ofmt;
AVStream* ost;
AVPacket packet;
string sFileInput;
string sFileOutput;
sFileInput = rtspUrl;
var startNumber = 0;
var filePrefix = "camera" + cameraId;
// create folder if not exist
if (!Directory.Exists(destinationFolder))
{
Directory.CreateDirectory(destinationFolder);
}
var files = Directory.GetFiles(destinationFolder, "*" + filePrefix + "*");
if (files.Any())
{
var lastFile = files.Last();
var temp = lastFile.Substring(lastFile.Length - 7, 3);
if (int.TryParse(temp, out startNumber))
{
startNumber++;
}
}
string NextFile = string.Format("{0}\\{1}-{2:000}.mp4", destinationFolder, filePrefix, startNumber);
//EventLog.WriteEntry(sSource, "Capturing " + NextFile );
sFileOutput = NextFile;
FFmpegBinariesHelper.RegisterFFmpegBinaries();
// Initialize library
ffmpeg.av_log_set_level(ffmpeg.AV_LOG_DEBUG);
ffmpeg.av_register_all();
ffmpeg.avcodec_register_all();
ffmpeg.avformat_network_init();
//
// Input
//
AVFormatContext** tmpIfcx = &ifcx;
var ts = new CancellationTokenSource();
CancellationToken ct = ts.Token;
var task = new Task<int>(() => Avformat_open_input_async(tmpIfcx, sFileInput),ct);
task.Start();
task.Wait(2000);
if (!task.IsCompleted)
{
ts.Cancel();
//EventLog.WriteEntry(sSource, "Waiting on task Avformat_open_input_async ", EventLogEntryType.Warning);
task.Wait(2000);
//EventLog.WriteEntry(sSource, "Timeout callling " + sFileInput, EventLogEntryType.Error);
return;
}
var result = task.Result;
//open rtsp
// ifcx = tmpIfcx;
if (result != 0)
{
EventLog.WriteEntry(sSource, "ERROR: Cannot open input file " + sFileInput, EventLogEntryType.Error);
return;
}
if (ffmpeg.avformat_find_stream_info(ifcx, null) < 0)
{
EventLog.WriteEntry(sSource, "ERROR: Cannot find stream info\n", EventLogEntryType.Error);
ffmpeg.avformat_close_input(&ifcx);
return;
}
//search video stream
v_index = -1;
a_index = -1;
for (int ix = 0; ix < ifcx->nb_streams; ix++)
{
if (ifcx->streams[ix]->codec->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
{
v_ist = ifcx->streams[ix];
v_icodec = ifcx->video_codec;
v_index = ix;
v_iccx = ifcx->streams[ix]->codec;
}
if (ifcx->streams[ix]->codec->codec_type == AVMediaType.AVMEDIA_TYPE_AUDIO)
{
a_ist = ifcx->streams[ix];
a_icodec = ifcx->video_codec;
a_index = ix;
a_iccx = ifcx->streams[ix]->codec;
}
}
if (v_index < 0)
{
EventLog.WriteEntry(sSource, "ERROR: Cannot find input video stream\n",EventLogEntryType.Error);
ffmpeg.avformat_close_input(&ifcx);
return;
}
//
// Output
//
//open output file
ofmt = ffmpeg.av_guess_format(null, sFileOutput, "mp4");
// ffmpeg.format
ofcx = ffmpeg.avformat_alloc_context();
ofcx->oformat = ofmt;
ffmpeg.avio_open(&ofcx->pb, sFileOutput, ffmpeg.AVIO_FLAG_WRITE);
// Create output stream
ost = ffmpeg.avformat_new_stream( ofcx, (AVCodec *) v_iccx->codec );
AVStream* a_ost = ffmpeg.avformat_new_stream(ofcx, (AVCodec*)a_iccx->codec);
//ost = ffmpeg.avformat_new_stream(ofcx, ifcx->video_codec);
ffmpeg.avcodec_copy_context(ost->codec, v_iccx);
ffmpeg.avcodec_copy_context(a_ost->codec, a_iccx);
ffmpeg.avcodec_open2(v_iccx, v_icodec, null);
ffmpeg.avcodec_open2(a_iccx, a_icodec, null);
// Assume r_frame_rate is accurate
var avRational = new AVRational();
avRational.den = ost->r_frame_rate.den * 2;
avRational.num = ost->r_frame_rate.num ;
var aaRational = new AVRational();
aaRational.den = a_ost->r_frame_rate.den ;
aaRational.num = a_ost->r_frame_rate.num ;
ost->r_frame_rate = avRational;
ost->avg_frame_rate = ost->r_frame_rate;
ost->time_base = av_inv_q(ost->r_frame_rate);
ost->codec->time_base = ost->time_base;
a_ost->r_frame_rate = aaRational;
a_ost->avg_frame_rate = a_ost->r_frame_rate;
a_ost->time_base = av_inv_q(a_ost->r_frame_rate);
a_ost->codec->time_base = a_ost->time_base;
ffmpeg.avformat_write_header(ofcx, null);
//start reading packets from stream and write them to file
ffmpeg.av_dump_format(ifcx, 0, ifcx->filename.ToString(), 0);
ffmpeg.av_dump_format(ofcx, 0, ofcx->filename.ToString(), 1);
timestart = timenow = DateTime.Now;
ffmpeg.av_init_packet(&packet);
if (segmentLength == 0)
segmentLength = 15;
var dateToEnd = DateTime.Now.AddMinutes(segmentLength);
//EventLog.WriteEntry(sSource, "date to end capture " + dateToEnd.ToString());
while ( (dateToEnd - DateTime.Now).TotalMinutes > 0 && IsCapturing)
{
if (endDateTime.HasValue && DateTime.Compare(DateTime.Now, endDateTime.Value) >= 0)
{
ffmpeg.av_packet_unref(&packet);
ffmpeg.av_init_packet(&packet);
IsCapturing = false;
break;
}
int readFrame = -1;
try
{
readFrame = ffmpeg.av_read_frame(ifcx, &packet);
}
catch(Exception ex)
{
EventLog.WriteEntry(sSource, $"Error av_read_frame {ex.ToString()}", EventLogEntryType.Error);
break;
}
if (readFrame < 0)
{
EventLog.WriteEntry(sSource, "reafFrame < 0 " + NextFile, EventLogEntryType.Error);
ffmpeg.av_packet_unref(&packet);
ffmpeg.av_init_packet(&packet);
break;
}
if (packet.stream_index == v_index)
{ //packet is video
packet.stream_index = v_ist->index;
ffmpeg.av_interleaved_write_frame(ofcx, &packet);
}
if (packet.stream_index == a_index)
{ //packet is audio
SetPacketProperties(&packet, a_iccx, a_ist);
ffmpeg.av_interleaved_write_frame(ofcx, &packet);
}
ffmpeg.av_packet_unref(&packet);
ffmpeg.av_init_packet(&packet);
}
ffmpeg.av_read_pause(ifcx);
ffmpeg.av_write_trailer(ofcx);
ffmpeg.avio_close(ofcx->pb);
ffmpeg.avformat_free_context(ofcx);
ffmpeg.avformat_network_deinit();
答案 1 :(得分：0)
private unsafe void SetPacketProperties(AVPacket* packet, AVCodecContext* codecContext, AVStream* stream)
{
packet->pts = ffmpeg.av_rescale_q_rnd(packet->pts, codecContext->time_base, stream->time_base, AVRounding.AV_ROUND_NEAR_INF | AVRounding.AV_ROUND_PASS_MINMAX);
packet->dts = ffmpeg.av_rescale_q_rnd(packet->dts, codecContext->time_base, stream->time_base, AVRounding.AV_ROUND_NEAR_INF | AVRounding.AV_ROUND_PASS_MINMAX);
packet->duration = (int)ffmpeg.av_rescale_q(packet->duration, codecContext->time_base, stream->time_base);
packet->stream_index = stream->index;
}