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• How to run FFmpeg command in Qprocess to make it work ?

  18 août 2024, par NintySwinty

  I have problem with QProcess. I added FFmpeg and command to Qt process. When I run this and I don't see any changes in folder where should be files .mkv. Somebody said me to add "\n" to the but this don't help. ( I do it on macOS Catalina )

  


  void MainWindow::Recording(){

    qDebug() << "Nagrywam!";

    Qrec.setProcessChannelMode(QProcess::MergedChannels);
    Qrec.setProgram("/Users/nintyswinty/Desktop/Dev/Qt/build-PlazaPCO-Desktop_Qt_5_15_1_clang_64bit-Debug/ffmpeg");
    Qrec.setArguments({"-framerate", "30", "-f", "avfoundation", "-i", "1", "-f", "avfoundation", "-framerate", "30", "-i", "0", "-c:v", "libx264", "-crf", "0", "-preset", "ultrafast", "~/Desktop/PlazaPCO/" + QString::fromStdString(date) + ".mkv\n"});
    Qrec.start();
    Qrec.waitForFinished();

    qDebug() << "Koniec - nagrywam";

}```


  


• h264 restream works when i have no audio in ffserver conf but does not work when i try to add audio

  27 février 2014, par Dnaso

  I am trying to restream an h264 video stream from a camera. All works well when I have NoAudio in my conf file. However when i add audio, even the video stream does not work. Has anyone ever encountered thiss ?

  ffmpeg -i rtsp ://*** -s 320x240 -vcodec copy -acodec copy -s 320x240 -ab 64k http://*:8091/feed1.ffm

• Add black video to video with sound

  4 février 2017, par garrettlynch

  I’m trying to insert 13 seconds of black video at the start of a video that has sound using ffmpeg like so :

  ffmpeg -f lavfi -i "color=c=black:s=720x406:r=25:sar=1/1" -i input.mp4 -filter_complex \
  
  "[0:v] trim=end=13,setpts=PTS-STARTPTS [blackstart]; \
  
  [blackstart] [1:v] concat=n=2:v=1:a=0[out]" \
  
   -map "[out]" -c:a copy output.mp4

  However the sound is not being maintained. What am I doing incorrectly ? -c:a copy does not seem to work should I be using a [1:a] somewhere ?

  garrett-retina:~ garrett-macbookretina$ ffmpeg -f lavfi -i "color=c=red:s=720x406:r=25:sar=1/1" -i input.mp4 -filter_complex \
  
  > "[0:v] trim=end=13,setpts=PTS-STARTPTS [blackstart]; \
  
  > [blackstart] [1:v] concat=n=2:v=1:a=0[out]" \
  
  >  -map "[out]" -c:a copy output.mp4
  
  ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 5.0 (clang-500.2.76) (based on LLVM 3.3svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, lavfi, from 'color=c=red:s=720x406:r=25:sar=1/1':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x406 [SAR 1:1 DAR 360:203], 25 tbr, 25 tbn, 25 tbc
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.100
  
    Duration: 33:59:47.32, start: 0.000000, bitrate: 179 kb/s
  
      Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x406 [SAR 1:1 DAR 360:203], 62 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, stereo, fltp, 114 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [libx264 @ 0x7fa344048400] using SAR=1/1
  
  [libx264 @ 0x7fa344048400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x7fa344048400] profile High, level 3.0
  
  [libx264 @ 0x7fa344048400] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/Users/garrett-macbookretina/Desktop/Best of Luck With the Wall/exports/test.mp4':
  
    Metadata:
  
      encoder         : Lavf57.56.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x406 [SAR 1:1 DAR 360:203], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 (rawvideo) -> trim
  
    Stream #1:0 (h264) -> concat:in1:v0
  
    concat -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  frame=3060008 fps=432 q=-1.0 Lsize=  957795kB time=34:00:00.20 bitrate=  64.1kbits/s speed=17.3x    
  
  video:921972kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.885564%
  
  [libx264 @ 0x7fa344048400] frame I:16585 Avg QP:13.67  size: 49743
  
  [libx264 @ 0x7fa344048400] frame P:770518 Avg QP:16.48  size:    91
  
  [libx264 @ 0x7fa344048400] frame B:2272905 Avg QP:25.11  size:    22
  
  [libx264 @ 0x7fa344048400] consecutive B-frames:  0.9%  0.1%  0.4% 98.6%
  
  [libx264 @ 0x7fa344048400] mb I  I16..4: 10.2% 39.7% 50.1%
  
  [libx264 @ 0x7fa344048400] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.7%  0.0%  0.0%  0.0%  0.0%    skip:99.1%
  
  [libx264 @ 0x7fa344048400] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.2%  0.0%  0.0%  direct: 0.0%  skip:99.8%  L0:46.9% L1:53.1% BI: 0.1%
  
  [libx264 @ 0x7fa344048400] 8x8 transform intra:39.9% inter:52.0%
  
  [libx264 @ 0x7fa344048400] coded y,uvDC,uvAC intra: 86.1% 77.1% 60.4% inter: 0.0% 0.1% 0.0%
  
  [libx264 @ 0x7fa344048400] i16 v,h,dc,p: 66% 10% 13% 11%
  
  [libx264 @ 0x7fa344048400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 20% 14%  6%  7%  7%  7%  7% 11%
  
  [libx264 @ 0x7fa344048400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 19% 11%  7%  9%  8%  8%  7%  9%
  
  [libx264 @ 0x7fa344048400] i8c dc,h,v,p: 59% 19% 17%  5%
  
  [libx264 @ 0x7fa344048400] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fa344048400] ref P L0: 53.9%  4.0% 16.6% 25.5%  0.0%
  
  [libx264 @ 0x7fa344048400] ref B L0: 27.9% 71.6%  0.5%
  
  [libx264 @ 0x7fa344048400] ref B L1: 97.6%  2.4%
  
  [libx264 @ 0x7fa344048400] kb/s:61.71
  
  garrett-retina:~ garrett-macbookretina$