Recherche avancée

Sur d’autres sites (7359)

• spherical : Change types of bounding and pad to uint32_t

  16 mars 2017, par Vittorio Giovara

  spherical : Change types of bounding and pad to uint32_t
  These values are defined to be 32bit in the specification,
  
  so it makes more sense to store them as fixed width.
  Based on a patch by Micahel Niedermayer <michael@niedermayer.cc>.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DH] libavformat/dump.c
  • [DH] libavformat/matroskadec.c
  • [DH] libavformat/mov.c
  • [DH] libavutil/spherical.h

• Add ’audio/mp3’ and related MIME checks for flash, correct edge case where play({type :’audio/mp3’}) would use HTML5 when preferFlash = true due to seeming lack of Flash support for the MIME type.

  24 juin 2012, par Scott Schiller

  m script/soundmanager2-jsmin.js m script/soundmanager2-nodebug-jsmin.js m script/soundmanager2-nodebug.js m script/soundmanager2.js Add ’audio/mp3’ and related MIME checks for flash, correct edge case where play(type :’audio/mp3’) would use HTML5 when preferFlash = true due to seeming lack of (...)

• FFMPEG Implement RTSP Client, high speed playback

  11 juillet 2021, par TTGroup

  I am writing software to play videos that have been recorded from NVR. I have completed most of the work, but there is one more feature that allows the user to change the play speed such as 0.5x, 2x, 4x, 8x ...

  


  I searched the internet all day and still couldn't find any suggestions. Here is my summary code below.

  


  auto pFormatCtx = avformat_alloc_context();

av_dict_set_int(&opts, "rw_timeout", 5000000, 0);
av_dict_set_int(&opts, "tcp_nodelay", 1, 0);
av_dict_set_int(&opts, "stimeout", 10000000, 0);
av_dict_set(&opts, "user_agent", "Mozilla/5.0", 0);
av_dict_set(&opts, "rtsp_transport", "tcp", 0);
av_dict_set(&opts, "rtsp_flags", "prefer_tcp", 0);
av_dict_set_int(&opts, "buffer_size", BUFSIZE, 0);

int err = avformat_open_input(&pFormatCtx, fullRtspUri, NULL, &opts);
if(err < 0)
    return;
    
err = avformat_find_stream_info(pFormatCtx, NULL);
if (err < 0)
    return;
pFormatCtx->flags |= AVFMT_FLAG_NONBLOCK;
pFormatCtx->flags |= AVFMT_FLAG_DISCARD_CORRUPT;
pFormatCtx->flags |= AVFMT_FLAG_NOBUFFER;       
av_dump_format(pFormatCtx, 0, fullRtspUri, 0);
    
int videoStreamInd = -1;
for (int i = 0; i < pFormatCtx->nb_streams; i++)
{
    AVStream* stream = pFormatCtx->streams[i];
    if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
    {
        if (videoStreamInd == -1)
        {
            videoStreamInd = i;
            break;
        }
    }   
}

if (videoStreamInd == -1)
    return; 
auto videoStream = pFormatCtx->streams[videoStreamInd];

isRunning = true;
while(isRunning)
{
    ret = av_read_frame(pFormatCtx, avPacket);
    if (ret < 0)
        return; 

    if (avPacket->stream_index != videoStreamInd)
        continue;
    
    //Code for render process here............
}


  


  I have read through this NVR API documentation and see support for 2x, 4x speed play as below

  


  Play in 2× Speed:
PLAY rtsp://10.17.133.46:554/ISAPI/streaming/tracks/101?starttime=20170313T230652Z&endtime=20170314T025706Z RTSP/1.0
CSeq:6
Authorization: Digest username="admin", 
realm="4419b66d2485", 
nonce="a0ecd9b1586ff9461f02f910035d0486", 
uri="rtsp://10.17.133.46:554/ISAPI/streaming/tracks/101?starttime=20170313T230652Z&endtime=20170314T025706Z", 
response="fb986d385a7d839052ec4f0b2b70c631"
Session:2049381566;timeout=60
Scale:2.000
User-Agent:NKPlayer-1.00.00.081112

RTSP/1.0 200 OK
CSeq: 6
Session: 2049381566
Scale: 2.000
RTP-Info: url=trackID=1;seq=1,url=trackID=2;seq=1
Date: Tue, Mar 14 2017 10:57:24 GMT


  


  How to play RTSP video with speeds of 0.5x, 2x, 4x ...?
Everyone who can assist me in this case, I am very grateful.