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• NVENC works only with sudo (ffmpeg & obs)

  4 novembre 2020, par Elysian Flâneur

  I'm using the latest linux-lts kernel on Arch. I have been using software encoder for a while but recently I realized I can used NVENC codec if I run ffmpeg with root privileges.

  


  sudo ffmpeg -i input.mkv -c:v h264_nvenc -rc constqp -qp 28 output.mkv


  


  and afterwards I can use nvenc in both OBS and ffmpeg with non-root user
When I run

  


  ffmpeg -i input.mkv -c:v h264_nvenc -rc constqp -qp 28 output.mkv


  


  Then I reboot my system only to encounter the same problem and requires me to invoke ffmpeg nvenc command with sudo once. I searched everywhere about it but was not able to find a solution.
Here is a screenshot with the problem :
NVENC error on OBS

  


  Then I run this command once

  


  sudo ffmpeg -i input.mkv -c:v h264_nvenc -rc constqp -qp 28 output.mkv

  


  Afterwards I Restart OBS

  


  OBS working fine with NVENC after sudo ffmpeg

  


  Any idea what the reason could be ?

  


• FFMPEG not executing fully through python code but works from cmd

  3 mars 2020, par Shaun Micallef

  I am new to python and am trying to execute a cmd command using python like the following :

  os.system('cmd /c "ffmpeg -i {} -t 00:30 {}"'.format(videURLlink, video_name))

  when executing the above on my laptop it is working but on my pc it is not. the below is the result of the command execution but it doesn’t continue and stops there

  ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190807
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    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
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  [hls @ 0000016fa1800fc0] Skip ('#EXT-X-VERSION:3')
  
  [hls @ 0000016fa1800fc0] Opening 'https://hddn01.skylinewebcams.com/02900101X8TS-1583232346899.ts' for reading
  
  [hls @ 0000016fa1800fc0] Opening 'https://hddn01.skylinewebcams.com/02900101X8TS-1583232354899.ts' for reading
  
  [hls @ 0000016fa1800fc0] Could not find codec parameters for stream 1 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, hls, from 'https://hddn01.skylinewebcams.com/live.m3u8?a=bmnvut6ok8qfirptmtgu2j37c5':
  
    Duration: N/A, start: 18396.450000, bitrate: N/A
  
    Program 0 
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1280x1024, 12 fps, 12 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:1: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
  
      Metadata:
  
        variant_bitrate : 0

  I am using anaconda as the python interpreter and migrated the environment from my laptop to my pc.If I execute the cmd directly through cmd it works. Any idea why ?

• FFmpeg conversion to mp3 works in terminal, not in script

  19 juillet 2013, par user2598172

  I can run

  ffmpeg -i test.m4a -vn -acodec libmp3lame -ab 256k test.mp3

  And it works perfectly. However, when I have the line :

  ./ffmpeg -i "$SONG_SAVE.m4a" -vn -acodec libmp3lame -ab 256k "$SONG_SAVE$EXT" &> /dev/null

  running in a .sh script (downloading the same file that I was able to successfully convert through the terminal), it returns an mp3 file with no audio data. Does anyone have any idea what could be causing this ? Thanks !

  EDIT : here is the whole script :

   #!/bin/bash
  
  
  
  TITLE="$(echo "$1" | ./recode html..ascii | tr -d '\' | tr -s ' ' | sed 's|\ *$||')"
  
  TAG_TITLE="$2"
  
  ARTIST="$(echo "$3" | ./recode html..ascii | tr -d '\' | tr -s ' ')"
  
  ALBUM="$(echo "$4" | ./recode html..ascii | tr -d '\' | tr -s ' ')"
  
  IMG="$5"
  
  TRACK_NUMBER="$6"
  
  TOTAL_TRACKS="$7"
  
  URL="$8"
  
  MIX_TITLE="$9"
  
  CONVERT="${10}"
  
  RECURSIVE="${11}"
  
  SESSION_ID="${12}"
  
  DOWNLOAD_ID="${13}"
  
  SONG_ID="${14}"
  
  
  
  SONG_SAVE="songs/$SONG_ID"
  
  ZIP_SAVE="$SESSION_ID-$DOWNLOAD_ID.zip"
  
  ZIP_DIR="$MIX_TITLE/"
  
  ARTWORK_SAVE="artwork/$MIX_TITLE.png"
  
  SAVE_TITLE="$(echo "$TITLE" | sed 's|/|-|g;s|^\.||g')"
  
  
  
  [ "$TAG_TITLE" == "false" ] && unset TITLE
  
  [ "$ARTIST" == "false" ] && unset ARTIST
  
  [ "$ALBUM" == "false" ] && unset ALBUM
  
  [ "$IMG" == "false" ] && unset IMG
  
  [ "$TRACK_NUMBER" == "false" ] && unset TRACK_NUMBER TOTAL_TRACKS
  
  [ "$CONVERT" == "false" ] && unset CONVERT
  
  [ "$RECURSIVE" == "false" ] && unset RECURSIVE
  
  
  
  while [ -f "SONG_SAVE".part ]; do
  
      sleep 2
  
  done
  
  
  
  if [ -f "$SONG_SAVE".m4a ]; then
  
      EXT=".m4a"
  
      touch "$SONG_SAVE$EXT"
  
  elif [ -f "$SONG_SAVE".mp3 ]; then
  
      EXT=".mp3"
  
      touch "$SONG_SAVE$EXT"
  
  else
  
      curl -Lso "$SONG_SAVE".part "$URL"
  
  
  
      if [ -n "$(file -b "$SONG_SAVE".part | grep "MPEG ADTS")" ]; then
  
          EXT=".mp3"
  
      elif [ -n "$(file -b "$SONG_SAVE".part | grep "MPEG v4")" ]; then
  
      EXT=".m4a"
  
  else
  
      EXT=".txt"
  
      echo "Unable to download: $URL. Sorry ):" > "$SONG_SAVE".part
  
  fi
  
  
  
  mv "$SONG_SAVE".part "$SONG_SAVE$EXT"
  
  fi
  
  
  
  if [ -n "$CONVERT" ] && [ "$EXT" == ".m4a" ]; then
  
  EXT=".mp3"
  
  if [ ! -f "$SONG_SAVE$EXT" ]; then
  
      ./ffmpeg -i "$SONG_SAVE.m4a" -vn -acodec libmp3lame -ab 256k "$SONG_SAVE$EXT"         &> /dev/null
  
      fi
  
  fi
  
  
  
  if [ "$EXT" == ".mp3" ]; then
  
      ./eyeD3 --remove-images -t "$TITLE" -a "$ARTIST" -A "$ALBUM" -n "$TRACK_NUMBER" -N     "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      if [ -n "$IMG" ]; then
  
      [ ! -f "$ARTWORK_SAVE" ] && curl -Lso "$ARTWORK_SAVE" "$IMG"
  
          ./eyeD3 --add-image="$ARTWORK_SAVE":FRONT_COVER "$SONG_SAVE$EXT" &> /dev/null
  
      fi
  
  elif [ "$EXT" == ".m4a" ]; then
  
  if [ -n "$IMG" ]; then
  
      [ ! -f "$ARTWORK_SAVE" ] && curl -Lso "$ARTWORK_SAVE" "$IMG"
  
      if [ -n "$TRACK_NUMBER" ]; then
  
          ./mp4tags -P "$ARTWORK_SAVE" -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" -t "$TRACK_NUMBER" -T "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      else
  
          ./mp4tags -P "$ARTWORK_SAVE" -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" "$SONG_SAVE$EXT" &> /dev/null
  
      fi
  
  else
  
      if [ -n "$TRACK_NUMBER" ]; then
  
          ./mp4tags -r P -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" -t "$TRACK_NUMBER" -T "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      else
  
          ./mp4tags -r P -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" "$SONG_SAVE$EXT" &> /dev/null
  
          fi
  
      fi
  
  fi
  
  
  
  if [ -n "$RECURSIVE" ]; then
  
      cd archives
  
      mkdir -p "$ZIP_DIR"
  
      chmod 777 "$ZIP_DIR"
  
      cp "../$SONG_SAVE$EXT" "$ZIP_DIR$SAVE_TITLE$EXT"
  
      ./zip -q -0 -D -r "$ZIP_DIR$ZIP_SAVE" "$ZIP_DIR$SAVE_TITLE$EXT" &> /dev/null
  
      rm -f "$ZIP_DIR$SAVE_TITLE$EXT"
  
      printf "archives/$ZIP_DIR$ZIP_SAVE\n$MIX_TITLE.zip\n$EXT\n"
  
      echo "$(du -h "$ZIP_DIR$ZIP_SAVE" | tr '\t' '\n' | head -1)"
  
  else
  
      printf "$SONG_SAVE$EXT\n$SAVE_TITLE$EXT\n$EXT"
  
  fi