CanRun = true;
//FFmpegDLL目錄查找和設定
FFmpegBinariesHelper.RegisterFFmpegBinaries();
#region ffmpeg 初始化
// 初始化注冊ffmpeg相關的編碼器
ffmpeg.av_register_all();
ffmpeg.avcodec_register_all();
ffmpeg.avformat_network_init();
#endregion
#region ffmpeg 日志
// 設定記錄ffmpeg日志級別
//ffmpeg.av_log_set_level(ffmpeg.AV_LOG_VERBOSE);
//av_log_set_callback_callback logCallback = (p0, level, format, vl) =>
//{
// if (level > ffmpeg.av_log_get_level()) return;
// var lineSize = 1024;
// var lineBuffer = stackalloc byte[lineSize];
// var printPrefix = 1;
// ffmpeg.av_log_format_line(p0, level, format, vl, lineBuffer, lineSize, &printPrefix);
// var line = Marshal.PtrToStringAnsi((IntPtr)lineBuffer);
// Console.Write(line);
//};
//ffmpeg.av_log_set_callback(logCallback);
#endregion
AVFormatContext* i_fmt_ctx;
AVStream* i_video_stream = null;
AVFormatContext* o_fmt_ctx;
AVStream* o_video_stream;
/* should set to null so that avformat_open_input() allocate a new one */
i_fmt_ctx = null;
if (ffmpeg.avformat_open_input(&i_fmt_ctx, url, null, null) != 0)
{
return;
}
if (ffmpeg.avformat_find_stream_info(i_fmt_ctx, null) < 0)
{
return;
}
//av_dump_format(i_fmt_ctx, 0, argv[1], 0);
/* find first video stream */
for (uint i = 0; i < i_fmt_ctx->nb_streams; i++)
{
if (i_fmt_ctx->streams[i]->codec->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
{
i_video_stream = i_fmt_ctx->streams[i];
break;
}
}
ffmpeg.avformat_alloc_output_context2(&o_fmt_ctx, null, null, filename);
/*
* since all input files are supposed to be identical (framerate, dimension, color format, ...)
* we can safely set output codec values from first input file
*/
o_video_stream = ffmpeg.avformat_new_stream(o_fmt_ctx, null);
{
AVCodecContext* c;
c = o_video_stream->codec;
c->bit_rate = 400000;
c->codec_id = i_video_stream->codec->codec_id;
c->codec_type = i_video_stream->codec->codec_type;
c->time_base.num = i_video_stream->time_base.num;
c->time_base.den = i_video_stream->time_base.den;
//fprintf(stderr, "time_base.num = %d time_base.den = %d\n", c->time_base.num, c->time_base.den);
c->width = i_video_stream->codec->width;
c->height = i_video_stream->codec->height;
c->pix_fmt = i_video_stream->codec->pix_fmt;
//printf("%d %d %d", c->width, c->height, c->pix_fmt);
c->flags = i_video_stream->codec->flags;
c->flags |= ffmpeg.CODEC_FLAG_GLOBAL_HEADER;
c->me_range = i_video_stream->codec->me_range;
c->max_qdiff = i_video_stream->codec->max_qdiff;
c->qmin = i_video_stream->codec->qmin;
c->qmax = i_video_stream->codec->qmax;
c->qcompress = i_video_stream->codec->qcompress;
}
//DateTime StartTime = DateTime.Now;
//DateTime StopTime = StartTime.AddSeconds(Secodes);
ffmpeg.avio_open(&o_fmt_ctx->pb, filename, ffmpeg.AVIO_FLAG_WRITE);
ffmpeg.avformat_write_header(o_fmt_ctx, null);
long last_pts = 0;
long last_dts = 0;
long pts = 0;
long dts = 0;
while (CanRun)
{
AVPacket i_pkt;
ffmpeg.av_init_packet(&i_pkt);
i_pkt.size = 0;
i_pkt.data = null;
if (ffmpeg.av_read_frame(i_fmt_ctx, &i_pkt) < 0)
break;
/*
* pts and dts should increase monotonically
* pts should be >= dts
*/
i_pkt.flags |= ffmpeg.AV_PKT_FLAG_KEY;
pts = i_pkt.pts;
i_pkt.pts += last_pts;
dts = i_pkt.dts;
i_pkt.dts += last_dts;
i_pkt.stream_index = 0;
ffmpeg.av_interleaved_write_frame(o_fmt_ctx, &i_pkt);
//if (DateTime.Now > StopTime)
//{
// CanRun = false;
//}
}
last_dts += dts;
last_pts += pts;
ffmpeg.avformat_close_input(&i_fmt_ctx);
ffmpeg.av_write_trailer(o_fmt_ctx);
ffmpeg.avcodec_close(o_fmt_ctx->streams[0]->codec);
ffmpeg.av_freep(&o_fmt_ctx->streams[0]->codec);
ffmpeg.av_freep(&o_fmt_ctx->streams[0]);
ffmpeg.avio_close(o_fmt_ctx->pb);
ffmpeg.av_free(o_fmt_ctx);
以上是代碼，局域網的rtsp流保存正常，但是外網rtsp流保存之后播放視頻的有13秒的空資料，如保存20秒的視頻資料，局域網的rtsp流是完成的20秒視頻，外網的視頻也是20秒，但有13秒是無資料的（不明白是不是沒有資料），總之播放視頻的13秒是黑屏的。有大神幫忙看下嗎
uj5u.com熱心網友回復：
無影像的時候有聲音沒有，如果是只收到I幀沒有P幀，也會花屏，不會徹底沒影像。uj5u.com熱心網友回復：
沒有聲音，不是花屏，就是沒有任何影像，相當于是黑屏狀態，比如我用VLC播放該視頻，前面13秒顯示的vlc的logo頁。
轉載請註明出處，本文鏈接：https://www.uj5u.com/net/268044.html
標籤：C#
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