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• while using opencv in python getting error —>[h264 @ 0x7fd8f4027fc0] error while decoding MB 12 46, bytestream -6 "

  22 janvier 2021, par Himanshu sharma

  I am getting this error —> " [h264 @ 0x7fd8f4027fc0] error while decoding MB 12 46, bytestream -6 "
  
while straming IP camera in python using opencv module.
  
As this error occure, i can't ableenter image description here to save video. You can see this in video enter image description here

  


  Python-> 3.8.5 (default, Jul 28 2020, 12:59:40) [GCC 9.3.0] on linux OS-
Ubuntu - 20.04
OpenCV - 4.4.0
opencv-contrib-python==4.4.0.46

  


  ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
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
himanshu@himanshu-H81M-S:~$ 


  


• Works on FFMPEG 4, but FFMPEG 3 says emerge has unconnected output ?

  23 novembre 2020, par Karl Messner

  I'm combining an intro (.mp4/stereo) with video (.mp4/MONO) and and outdo (.mp4/stereo)

  


  ALSO, I want to add a background music. (.mp3/stereo) to the video. Adding stereo music to mono video. Then concat.

  


  It works fine on my MacOS localhost FFMPEG 4.x, but I upload to HostUpon, running FFMPEG 3.x and get this error :

  


  Filter amerge has a unconnected output

  


  I've tried a million variations of channel layout and pan configurations but the docs aren't clear enough for a newb. Any help greatly appreciated.

  


  /usr/local/bin/ffmpeg -report -i videos/intro720.mp4 -i videos/raw.mp4 -i videos/outro720.mp4 -i videos/music.mp3 -filter_complex " \
[0] scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1[v0]; \
[1] scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1[v1]; \
[2] scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1[v2]; \
[3:a]volume=.015[a0]; \
[1:a][a0]amerge[amix]; \
[v0][0:a:0] [v1][aMix] [v2][2:a:0] concat=n=3:v=1:a=1[v][a]" -map "[v]" -map "[a]" -f mp4 videos/out1606134367mp4 2>&1

ffmpeg started on 2020-11-23 at 07:26:07
Report written to "ffmpeg-20201123-072607.log"
ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
  configuration: --enable-gpl --enable-nonfree --enable-shared --enable-libmp3lame --enable-libx264 --enable-libfdk-aac --enable-libtheora --enable-libvorbis --enable-libxvid --enable-libfreetype --enable-libvpx
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/intro720.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.12.100
    episode_sort    : 0
    season_number   : 0
    media_type      : 0
    hd_video        : 0
  Duration: 00:00:08.34, start: 0.023220, bitrate: 331 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 16:15 DAR 256:135], 269 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 53 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/raw.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2020-11-18 19:47:11
    com.android.version: 10
    com.android.manufacturer: Google
    com.android.model: Pixel XL
  Duration: 00:01:15.98, start: 0.000000, bitrate: 17097 kb/s
    Stream #1:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m), 1920x1080, 16997 kb/s, SAR 1:1 DAR 16:9, 29.91 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2020-11-18 19:47:11
      handler_name    : VideoHandle
    Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 95 kb/s (default)
    Metadata:
      creation_time   : 2020-11-18 19:47:11
      handler_name    : SoundHandle
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/outro720.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.12.100
    episode_sort    : 0
    season_number   : 0
    media_type      : 0
    hd_video        : 0
  Duration: 00:00:09.15, start: 0.023220, bitrate: 208 kb/s
    Stream #2:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 198 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[mp3 @ 0x10c5e40] Skipping 0 bytes of junk at 138.
[mp3 @ 0x10c5e40] Estimating duration from bitrate, this may be inaccurate
Input #3, mp3, from 'videos/music.mp3':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6mp41
    encoder         : Lavf57.19.100
  Duration: 00:01:56.69, start: 0.000000, bitrate: 192 kb/s
    Stream #3:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
Filter amerge has a unconnected output


  


• VLC - standard output 'dst=-' stopped working

  2 juin 2020, par gdogg371

  Using VLC 3 I had the following command working perfectly a few months back :

  



  "G:\VLC\vlc" --ffmpeg-hw --avcodec-hw=any dshow:// :dshow-vdev="Video (00 Pro Capture HDMI 4K+)" :dshow-adev="Audio (2- 00 Pro Capture HDMI 4K+)" :dshow-threads=8 :dshow-aspect-ratio=16\:9 :dshow-size="3840x2160" :dshow-pixel_format=yuv444p16le :dshow-tune=film :dshow-preset=lossless :dshow-profile=main10 show-vcodec=hevc_nvenc :dshow-fps=50 :dshow-crf=0 :dshow-acodec=mp4a :dshow-stereo-mode=5 :dshow-force-surround-sound=0 :dshow-ab=128 :dshow-samplerate=44100 :no-dshow-config :live-caching=300 --sout "#transcode{venc=ffmpeg,vcodec=mp2v,threads=8,aspect=16:9,width=3840,height=2160,fps=50,acodec=a52,ab=1500,channels=6,samplerate=48000,soverlay}:standard{access=file,dst=-,mux=ts}"


  



  ...however dst=- suddenly seems to be causing a problem. I get the following error :

  



  -- logger module started --
main: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
file error: write error: Bad file descriptor
stream_out_standard error: no suitable sout access module for `file/ts://-'
main error: stream chain failed for `transcode{venc=ffmpeg,vcodec=mp2v,threads=8,aspect=16:9,width=3840,height=2160,fps=50,acodec=a52,ab=1500,channels=6,samplerate=48000,soverlay}:standard{access=file,dst=-,mux=ts}'
main error: cannot start stream output instance, aborting
file error: write error: Bad file descriptor
stream_out_standard error: no suitable sout access module for `file/ts://-'
main error: stream chain failed for `transcode{venc=ffmpeg,vcodec=mp2v,threads=8,aspect=16:9,width=3840,height=2160,fps=50,acodec=a52,ab=1500,channels=6,samplerate=48000,soverlay}:standard{access=file,dst=-,mux=ts}'
main error: cannot start stream output instance, aborting
-- logger module stopped --


  



  Previous behaviour observed was that VLC would open and start streaming. The purpose of this exercise is to pipe the VLC output into a PVR called NPVR.

  



  I have tried uninstalling VLC and downloading a fresh install, but I still have the same issue. Any ideas ?