[Libav-user] How to clear real-time buffer?

[salsaman]

Maybe something like this ?

 for (int i = 0; i < input_context->nb_streams; i++) {
  AVStream *s = input_context->streams[i];
  AVCodecContext *cc = s->codec;
  avcodec_flush_buffers(cc);
}



http://lives-video.com
https://www.openhub.net/accounts/salsaman


On Fri, Mar 27, 2020 at 1:08 AM Roger Pack <rogerdpack2 at gmail.com> wrote:

> You'd probably have to drill into dshow.c and maybe add a method to it?
>
> On Thu, Nov 29, 2018 at 6:16 AM DDD ZZZ <mymail67-at-mail.ru at ffmpeg.org>
> wrote:
> >
> > Hi everybody!
> > Here's the part of c++ code that I'm using to access my webcam.
> >
> > **********************************************************************
> > **********************************************************************
> >
> > int Camera::Init(char* file_name,
> >                 char* device_name,
> >                 char* format,
> >                 char* resolution,
> >                 char* frame_rate,
> >                 char* pixel_format)
> > {
> >     av_log(NULL, AV_LOG_INFO, "---INIT STARTED---\n");
> >     avdevice_register_all();
> >     av_register_all();
> >
> >     AVDictionary* properties_collection = NULL;
> >     av_dict_set(&properties_collection, "f", format, NULL);
> >     av_dict_set(&properties_collection, "video_size", resolution, NULL);
> >     av_dict_set(&properties_collection, "framerate", frame_rate, NULL);
> >     av_dict_set(&properties_collection, "pix_fmt", pixel_format, NULL);
> >     AVInputFormat *input_format = av_find_input_format("dshow");
> >     char command_line[256];
> >     sprintf(command_line, "video=%s", device_name);
> >     AVFormatContext *input_context = avformat_alloc_context();
> >     //input_context->flags |= AVFMT_FLAG_NOBUFFER;      //DOESN'T HELP
> >     //input_context->max_picture_buffer = 0;            //ERR
> >
> >     int err_code = 0;
> >     err_code = avformat_open_input(&input_context,
> >                                     command_line,
> >                                     input_format,
> >                                     &properties_collection);
> >
> > //////////////////////////////////////
> > //////////PROBLEM SECTION/////////////
> > //////////////////////////////////////
> >     int i = 0;
> >     while (i++ < 30)
> >     {
> >         Sleep(1000);
> >         //avformat_flush(input_context); //DOESN'T HELP
> >         //av_free(input_context); //ERR
> >     }
> > //////////////////////////////////////
> >     system("pause");
> >     return 0;
> > }
> >
> > **********************************************************************
> > **********************************************************************
> >
> > Right after "avformat_open_input()" it starts reading frames to some
> internal buffer without me even calling "av_read_frame()". After about 10
> seconds it start's giving me error messages:
> >
> > [dshow @ 0014ed40] real-time buffer [VirtualBox Webcam - FULL HD 1080P
> Webcam] [video input]
> > too full or near too full (62% of size: 3041280 [rtbufsize parameter])!
> > frame dropped!
> > ...
> > ...
> > ...
> > [dshow @ 0014ed40] real-time buffer [VirtualBox Webcam - FULL HD 1080P
> Webcam] [video input]
> > too full or near too full (100% of size: 3041280 [rtbufsize parameter])!
> > frame dropped!
> >
> >
> > Q: How to clear this buffer or avoid using it?
> >
> > Thanks in advance.
> >
> >
> >
> > P.S.Please pardon my english.
> >
> > P.P.S.Have a good day.
> >
> >
> > _______________________________________________
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> >
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