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• Problems using Cuda for video transcoding [closed]

  19 août 2022, par Jay Adlard

  I just bought a new pc as my faithful old windows 7 i7 laptop died. Now the laptop had both intel and nvidea gtx660m chips. When I transcoded video with handbrake the intel graphics managed 8fps when I changed over to the nvidia it managed 80fps and the graphics card got nice and hot so was obviously working.

  


  The new machine i bought is a i9 with an nvidea gtx780 running windows 10. When I tried to transcode some video hoping for it to use the cpu and Gpu but no joy,the card stays cool power usage is only a handful of watts higher than it running something simple.I had been using handbrake but I read it doesn’t support Cuda so why the laptop speeded up I don’t know. A friend of mine that is into ffmpeg came round found that ffmpeg reports no Cuda yet the card works fine in every other respect. Unlike the rest of the machine the graphics card wasn’t new but it looked like new…

  


  One thing to note I am not talking about nvenc as the quality is rather poor, no point in capturing uncompressed files cleaning them up and not using an encoder that will do 2 pass and an exhaustive search.
Can anyone recommend a reasonably priced encoder that will use the Cuda cores ?

  


  Has anyone got any idea what the problem is ?

  


• Problem with ffplay from webcam stream using complex filters

  29 mai 2022, par efelbar

  I'm trying to stream video from a webcam (at /dev/video2) through ffplay to scale and recolor it, add some text, and then reduce the number of colors with palettes. I don't get any errors, but running the ffplay command :

  


  ffplay -i /dev/video2 -vf "hflip,\
  colorbalance=\
    rs=0.4:\
    bs=-0.4\
  ,\
  scale=\
    trunc(iw/8):\
    trunc(ih/8)\
  ,\
  drawtext=\
    text=\
      'efelbar':\
      fontcolor=white:\
      fontsize=10:\
      box=1:\
      boxcolor=black:\
      boxborderw=5:\
      x=(w-text_w)/2:\
      y=(h-text_h)/2\
  ,\
  split[s0][s1];\
  [s0]palettegen=\
    max_colors=16\
  [p];\
  [s1][p]paletteuse"


  


  seems to stall, and fails to produce video output.

  


  Running the simpler command ffplay -i /dev/video2 -vf "split[s0][s1];[s0]palettegen=max_colors=16[p];[s1][p]paletteuse", which takes a stream from a webcam and (should) reduce the number of colors, results in it just sitting there without showing the actual output stream. This might just be a performance issue because I'm on older hardware, but it doesn't give output relfective of that.

  


  The output of that command is as follows :

  


  ffplay version n5.0 Copyright (c) 2003-2022 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-shared --enable-version3
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, video4linux2,v4l2, from '/dev/video2':B sq=    0B f=0/0   
  Duration: N/A, start: 254970.739108, bitrate: 147456 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn


  


  I'm running this on a thinkpad t420s, so I definitely wouldn't be surprised if my laptop just can't process video that quickly. If that is the case, suggestions for optimizations would be great !

  


• cannot hear audio after saving RTSP stream as ts or avi or mp4 files using ffmpeg command

  28 mai 2022, par ewang

  I am still new to ffmpeg and trying to save RTSP stream from the IP camera (Meraki MV2) via RTSP link (rtsp ://192.168.0.80:9000/live) to local laptop (Windows 10) as ts file, or avi or mp4 files, but none of them can hear sound. In Meraki MV2 camera dashboard audio is enabled
meraki dashboard audio enabled screenshot

  


  And below is the ffmpeg command i used :

  


  ffmpeg -use_wallclock_as_timestamps 1 -rtsp_transport tcp -i rtsp://192.168.0.80:9000/live -f mpegts -b 400k -r 25 -vcodec libx264 -s 640x480 -aspect 4:3 -bufsize 6000k -acodec aac -ab 56k -ac 2 -ar 22050 -bf 0 -level 30 -y record_a_v.ts


  


  In below part of the result log, noticed Steam mapping has a #0:1 -> #0:0 and #0:0 -> #0:1, is it supposed to be crossed or not really ?

  


  Input #0, rtsp, from 'rtsp://192.168.0.80:9000/live':
  Metadata:
    title           : www rtsp live
    comment         : LIVE555 Streaming Media v2017.01.26
  Duration: N/A, start: 1653723857.755958, bitrate: N/A
  Stream #0:0: Audio: aac (LC), 48000 Hz, mono, fltp
  Stream #0:1: Video: h264 (High), yuvj420p(pc, smpte170m, progressive), 1920x1080, 90k tbr, 90k tbn
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (aac (native) -> aac (native))


  


  Here are the last section of the result log :

  


      Last message repeated 4 times
Error while decoding stream #0:0: Invalid argument:00:09.44 bitrate=  79.3kbits/s dup=0 drop=2 speed=1.38x
    Last message repeated 1 times
[aac @ 0000027bec8ee780] Queue input is backward in time
Error while decoding stream #0:0: Invalid argument
[mpegts @ 0000027bee8cfac0] Non-monotonous DTS in output stream 0:1; previous: 868241, current: 867392; changing to 868242. This may result in incorrect timestamps in the output file.
Error while decoding stream #0:0: Invalid argument
    Last message repeated 12 times
Error while decoding stream #0:0: Invalid argument:00:09.90 bitrate= 111.7kbits/s dup=0 drop=2 speed=1.35x
    Last message repeated 6 times
Error while decoding stream #0:0: Invalid argument:00:10.51 bitrate= 121.5kbits/s dup=0 drop=2 speed=1.34x
    Last message repeated 19 times
Error while decoding stream #0:0: Invalid argument:00:11.01 bitrate= 137.9kbits/s dup=0 drop=2 speed=1.31x
    Last message repeated 10 times
Error while decoding stream #0:0: Invalid argument:00:11.51 bitrate= 145.2kbits/s dup=0 drop=2 speed=1.29x
    Last message repeated 9 times
Error while decoding stream #0:0: Invalid argument:00:12.12 bitrate= 154.5kbits/s dup=0 drop=2 speed=1.29x
    Last message repeated 21 times
Error while decoding stream #0:0: Invalid argument:00:12.50 bitrate= 167.7kbits/s dup=0 drop=2 speed=1.26x
    Last message repeated 8 times
Error while decoding stream #0:0: Invalid argument:00:13.08 bitrate= 160.2kbits/s dup=0 drop=2 speed=1.25x
    Last message repeated 11 times
Error while decoding stream #0:0: Invalid argument:00:13.61 bitrate= 154.0kbits/s dup=0 drop=2 speed=1.24x
    Last message repeated 8 times
Error while decoding stream #0:0: Invalid argument:00:14.11 bitrate= 148.5kbits/s dup=0 drop=2 speed=1.23x
    Last message repeated 16 times
Error while decoding stream #0:0: Invalid argument:00:14.61 bitrate= 143.5kbits/s dup=0 drop=2 speed=1.22x
    Last message repeated 10 times
Error while decoding stream #0:0: Invalid argument:00:15.14 bitrate= 138.4kbits/s dup=0 drop=2 speed=1.21x
    Last message repeated 18 times
Error while decoding stream #0:0: Invalid argument:00:15.62 bitrate= 134.2kbits/s dup=0 drop=2 speed= 1.2x
    Last message repeated 6 times
Error while decoding stream #0:0: Invalid argument:00:16.14 bitrate= 129.9kbits/s dup=0 drop=2 speed=1.19x
    Last message repeated 15 times
Error while decoding stream #0:0: Invalid argument:00:16.64 bitrate= 251.9kbits/s dup=0 drop=2 speed=1.19x
    Last message repeated 9 times
Error while decoding stream #0:0: Invalid argument:00:17.11 bitrate= 245.1kbits/s dup=0 drop=2 speed=1.18x
    Last message repeated 15 times
frame=  125 fps=8.3 q=27.0 size=     512kB time=00:00:17.66 bitrate= 237.5kbits/s dup=0 drop=2 speed=1.17x

[q] command received. Exiting.

frame=  125 fps=8.2 q=-1.0 Lsize=     922kB time=00:00:17.75 bitrate= 425.1kbits/s dup=0 drop=2 speed=1.16x
video:843kB audio:2kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.064729%
[libx264 @ 0000027bee8cd640] frame I:1     Avg QP:17.27  size: 54983
[libx264 @ 0000027bee8cd640] frame P:124   Avg QP:22.65  size:  6516
[libx264 @ 0000027bee8cd640] mb I  I16..4:  4.2% 60.5% 35.2%
[libx264 @ 0000027bee8cd640] mb P  I16..4:  0.1%  2.4%  0.4%  P16..4: 39.2% 11.9% 10.2%  0.0%  0.0%    skip:35.9%
[libx264 @ 0000027bee8cd640] 8x8 transform intra:77.2% inter:55.0%
[libx264 @ 0000027bee8cd640] coded y,uvDC,uvAC intra: 93.1% 91.5% 65.1% inter: 26.5% 37.1% 6.2%
[libx264 @ 0000027bee8cd640] i16 v,h,dc,p:  8%  2%  8% 81%
[libx264 @ 0000027bee8cd640] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11%  9% 24%  5% 16% 12% 12%  6%  6%
[libx264 @ 0000027bee8cd640] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25%  9% 16%  6% 11% 14%  6%  6%  6%
[libx264 @ 0000027bee8cd640] i8c dc,h,v,p: 64% 12% 20%  5%
[libx264 @ 0000027bee8cd640] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000027bee8cd640] ref P L0: 77.9% 10.9%  7.7%  3.5%
[libx264 @ 0000027bee8cd640] kb/s:435.85
[aac @ 0000027bec8ee780] Qavg: 65536.000


  


  Can anyone help checking where went wrong ? Thanks