Recherche avancée

Sur d’autres sites (11180)

• ffmpeg writes invalid fps to the mp4 container (and in avi it is true). What is the reason ?

  8 juin 2020, par Ivan Sh.

  I need to record frames in real time. To test this situation, I make pts non-linear (since frames may be lost), thus :

  



  // AVFrame
video_frame->pts = prev_pts + 2;


  



  I use libavformat to write to a file. Parameters AVCodecContext and AVStream :

  



  #define STREAM_FRAME_RATE 25
#define CODEC_PIX_FMT  AV_PIX_FMT_YUV420P
#define FRAME_WIDTH 1440
#define FRAME_HEIGHT 900

// AVCodecContext
cc->codec_id = video_codec->id;
cc->bit_rate = 400000;
cc->width = FRAME_WIDTH;
cc->height = FRAME_HEIGHT;
cc->gop_size = 12;
cc->pix_fmt = CODEC_PIX_FMT;

// AVStream
video_stream->time_base = AVRational{ 1, STREAM_FRAME_RATE };
cc->time_base = video_stream->time_base;
cc->framerate = AVRational{ STREAM_FRAME_RATE , 1 };


  



  Write to file :

  



  static int write_frame(AVFormatContext *fmt_ctx, const AVRational *time_base, AVStream *st, AVPacket *pkt)
{
    /* rescale output packet timestamp values from codec to stream timebase */
    //av_packet_rescale_ts(pkt, *time_base, st->time_base);
    pkt->pts = av_rescale_q(pkt->pts, *time_base, st->time_base);
    pkt->dts = av_rescale_q(pkt->dts, *time_base, st->time_base);
    pkt->stream_index = st->index;

    /* Write the compressed frame to the media file. */
    //log_packet(fmt_ctx, pkt);
    //return av_write_frame(fmt_ctx, pkt);
    return av_interleaved_write_frame(fmt_ctx, pkt);
}


  



  If you use the avi container, then the information on the number of frames per second is indicated correctly in the file : 25 fps

  



  

  



  If you use the mp4 container, then the file information about the number of frames per second is indicated incorrectly : 12.5 fps

  



  

  



  Tell me, please, what other settings need to be added ?

  


• Choose Program 2 in ffmpeg

  11 juin 2020, par jilboobs seksi

  I tried to stream a video and i want to choose Program 2 in this command line in ffmpeg. How to do that ?

  



  Input #0, hls, from 'https://videodelivery.net/d0b94c4c5e737af01ff8f6a56e5fc1aa/manifest/video.m3u8':
Duration: 00:34:11.80, start: 0.062089, bitrate: N/A
Program 0
Metadata:
variant_bitrate : 400000
Stream #0:0(en): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 4 kb/s (default)
Metadata:
variant_bitrate : 5200000
comment         : eng
Stream #0:1: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 426x240 [SAR 640:639 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Metadata:
variant_bitrate : 400000
Program 1
Metadata:
variant_bitrate : 800000
Stream #0:0(en): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 4 kb/s (default)
Metadata:
variant_bitrate : 5200000
comment         : eng
Stream #0:2: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Metadata:
variant_bitrate : 800000
Program 2
Metadata:
variant_bitrate : 1800000
Stream #0:0(en): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 4 kb/s (default)
Metadata:
variant_bitrate : 5200000
comment         : eng
Stream #0:3: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 854x480 [SAR 1280:1281 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Metadata:
variant_bitrate : 1800000


  


• I want to get the data of the MPEG2ts data stream

  26 juin 2020, par 夏目たかし

  I want to get the data of the MPEG2ts data stream using FFMPEG.

  


  Delivery side :

  


  ffmpeg -re -i hoge.ts -map 0 -c copy -f mpegts udp://127.0.0.1:5004


  


  Receiver :

  


  ffmpeg -i udp://127.0.0.1:5004 -map 0:1 -codec copy -f data stream.txt


  


  I started two command prompts and both were running on one PC.

  


  disp Delivery side message :

  


  Input #0, mpegts, from 'E:/Day_Flight.mpg':
  Duration: 00:03:14.88, start: 10.000000, bitrate: 4187 kb/s
  Program 1
    Stream #0:0[0x1e1]: Video: h264 (Main) ([27][0][0][0] / 0x001B), 
yuv420p(progressive), 1280x720, 60 fps, 60 tbr, 90k tbn, 180k tbc
    Stream #0:1[0x1f1]: Data: klv (KLVA / 0x41564C4B)
Output #0, mpegts, to 'udp://127.0.0.1:5004':
  Metadata:
    encoder         : Lavf58.47.100
    Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720, q=2-31, 60 fps, 60 tbr, 90k tbn, 90k tbc
    Stream #0:1: Data: klv (KLVA / 0x41564C4B)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)


  


  disp Receiver message :

  


  Input #0, mpegts, from 'udp://127.0.0.1:5004':
  Duration: N/A, start: 1.400000, bitrate: N/A
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), 
yuv420p(progressive), 1280x720, 60 fps, 60 tbr, 90k tbn, 180k tbc
    Stream #0:1[0x101]: Data: klv (KLVA / 0x41564C4B)
Output #0, data, to 'stream.txt':
  Metadata:
    encoder         : Lavf58.47.100
    Stream #0:0: Data: klv (KLVA / 0x41564C4B)
Stream mapping:
  Stream #0:1 -> #0:0 (copy)


  


  However, the contents of steram.txt are empty.
Please give me some advice.