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• ffmpeg : capture rtsp stream continously without stoping

  21 décembre 2019, par Santhosh Yedidi

  I am trying to capture an rtsp stream

  ffmpeg -rtsp_transport tcp -i "rtsp://...." -acodec copy -vcodec copy file.ts

  But this will only record for few seconds and stop

  ffmpeg version n4.1.2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20181127
  
    configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [rtsp @ 0x564a002b4e80] max delay reached. need to consume packet
  
  [rtsp @ 0x564a002b4e80] RTP: missed 3 packets
  
  [h264 @ 0x564a002b8a80] out of range intra chroma pred mode
  
  [h264 @ 0x564a002b8a80] error while decoding MB 8 43
  
  [h264 @ 0x564a002b8a80] concealing 1401 DC, 1401 AC, 1401 MV errors in I frame
  
  Input #0, rtsp, from 'rtsp://...':
  
    Metadata:
  
      title           : RTSP Session/2.0
  
    Duration: N/A, start: 0.463333, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, progressive), 1280x960, 15 fps, 100 tbr, 90k tbn, 30 tbc
  
  Output #0, mpegts, to 'file.ts':
  
    Metadata:
  
      title           : RTSP Session/2.0
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, progressive), 1280x960, q=2-31, 15 fps, 100 tbr, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  380 fps= 16 q=-1.0 Lsize=    6962kB time=00:00:24.86 bitrate=2293.5kbits/s speed=1.06x    
  
  video:6416kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 8.512586%

  How to keep the recording continous

• FFMPEG Generate video clips and concatenate them all

  8 février 2020, par lms702

  I have a bunch of images (.png) and audio files (.wav) that I want to combine and concatenate. For example, if I have a1.wav, i1.png, a2.wav, and i2.png, I want to output a video that is a1.wav overlayed onto i1.png, then (concatenated to a2.wav overlayed onto i2.png.

  Currently, my approach is to save each individual clip and then concatenate them all at the end.

  To save each clip, I use this command (in a loop for all of my clips) :

  ffmpeg -i {imageFile} -i {audioFile} -nostdin -qscale:v 1 -vcodec libx264 -pix_fmt yuv420p {outputFile.mp4}``

  It outputs an mp4 that kind of works - the playback is really buggy but works in full screen.

  My current approach to concatenating has not been at all successful. I create a list of the clip names and put it into filename then call this command :

  ffmpeg -f concat -i {filename} -c copy clips/finalOutput.mp4

  This outputs a pretty jumbled video and this error repeated :

  [mp4 @ 000001cdec110740] Non-monotonous DTS in output stream 0:1; previous: 1045041, current: 604571; changing to 1045042. This may result in incorrect timestamps in the output file.

  So, a few questions.

  What is the best way to go about this process ?

  Should I be saving each clip or is there a better way to do it all in one command ?

  If I do save each clip, is there a better file format I should use ?

  Plz help with the concatenation command.

  Also note that because I am automating this with python I can build arbitrarily large commands, though that might not be ideal.

  I am very new to this and I would really appreciate any help !

• vp9 : split superframes in the filtering stage before actual decoding

  13 novembre 2016, par Anton Khirnov

  vp9 : split superframes in the filtering stage before actual decoding
  Significantly increases the efficiency of frame threading, since
  
  individual frames in a superframe can now be decoded in parallel.
  

  • [DBH] configure
  • [DBH] libavcodec/vp9.c