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• 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


  


• 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 ?

  


• CLI Extract date/time stamp (timestamp) from quicktime or mpeg files

  25 mai 2020, par vy32

  Is there a way to extract a date/time or a timestamp from various multi-media container files with Quicktime or MPEG2/MPEG4 ? I'm looking ideally for a command line tool. I have been able to get timestamps using ffprobe, part of the ffmpeg suite, but I haven't gotten the year, month and date. The camera had a clock so I'm pretty sure that this information was available.

  



  The history of this data file is that it was first shot on miniDV and transferred to a Mac over Firewire 800 using QuicktimePlayer to record the video. I'm told that the miniDV format is motion jpeg. The file command reports that the file is ISO Media, Apple QuickTime movie, Apple QuickTime (.MOV/QT).

  



  % ffprobe -f lavfi -i "movie=filename.mov,fps=fps=25[out0]" -show_frames -show_streams -show_entries frame=pkt_pts_time -of csv=p=0 2>&1 | head -30
ffprobe version 4.2.2 Copyright (c) 2007-2019 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-librsvg --enable-libtheora --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-libjack --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-indev=jack --enable-opencl --disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox --enable-sdl2 --disable-securetransport --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-x86asm --enable-libx265 --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid --enable-nonfree --enable-libfdk-aac
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, lavfi, from 'movie=/Volumes/SanDiskSSD/Movies/Italy22.mov,fps=fps=25[out0]':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
0.000000
0.040000
0.080000
0.120000
0.160000
0.200000
0.240000
0.280000
0.320000
0.360000
0.400000
0.440000
0.480000
0.520000
0.560000
%


  



  I want output showing the year, month and date that this was shot.