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• How can I use variables in long PowerShell command without breaking the command

  15 octobre 2020, par AFouquet

  I want to use ffmpeg to convert .m4a files in to .mp3 files.

  


  I can do it for each single file, but that takes a lot of effort to type in.

  


  ffmpeg -i '.\song.m4a' -ac 2 -b:a 192k '.\song.mp3'


  


  Is there a way to do this with powershell using variables ?
ex :

  


  ffmpeg -i $v -ac 2 -b:a 192k $v.mp3


  


  The problem with this is that then the -ac flag is taken as part of the path and not of ffmpeg anymore.

  


  Is there a way around this in powershell ?
  
Or could this be done with an array ? If I use $v=Get-ChildItem -Name and iterate over the array with a foreach loop in to the ffmpeg command.

  


  I am very new to PowerShell and don't have a lot of experience but it seems to me that should be possible to do.

  


  I would appreciate any help I can get.

  


• ffmpeg concat image with video, but output extra long

  11 octobre 2020, par Morris

  My goal : To concat an image (foo.jpg) with a video (bar.mp4, 3 seconds long). Show foo.jpg for 2 seconds only. Output video should be just around 5 seconds long.

  


  I used :

  


  ffmpeg -loop 1 -t 2 -framerate 1 -i foo.jpg -f lavfi -t 2 -i anullsrc -i bar.mp4 -filter_complex "[0][1][2:v][2:a] concat=n=2:v=1:a=1 [vpre][a];[vpre]fps=24,scale=32:24[v]" -map "[v]" -map "[a]" out.mp4


  


  I think the command means :
Loop foo.jpg for 2 seconds at framerate of 1 frame per second. At the same time, add silent audio track to the 2-second foo.jpg video.
Then concat with bar.mp4.
Make final output framerate 24 fps. Scale it to 32x24 dimension (intentionally tiny for testing).

  


  Expected : output to be about 5 seconds long in total.

  


  Reality : output is 3 minutes and 38 seconds long. The first 5 seconds is perfect. After that, video just stays silent with the 5th-second frame frozen until the end.

  


  My research shows that it might be related to -video_track_timescale

  


  This command also fails with same over-long result (I added -video_track_timescale 600) :

  


  ffmpeg -loop 1 -t 2 -framerate 1 -i foo.jpg  -f lavfi -t 2 -i anullsrc -i bar.mp4 -filter_complex "[0][1][2:v][2:a] concat=n=2:v=1:a=1 [vpre][a];[vpre]fps=24,scale=32:24[v]" -map "[v]" -map "[a]" -video_track_timescale 600 out.mp4


  


  Additional info about file bar.mp4 :

  


  $ ffmpeg -i bar.mp4 
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bar.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:01.94, start: 0.000000, bitrate: 641 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/unknown/smpte170m), 480x360 [SAR 1:1 DAR 4:3], 354 kb/s, 24.58 fps, 24.58 tbr, 113734695.00 tbn, 49.16 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 280 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified


  


• Video with music taking long time

  1er octobre 2020, par Konduri Sai Aditya

  Hi I am rendering video with filters and adding audio at the end. But while running it is taking a long time and rendering continuously. Can anyone help me where I am wrong ? below is the command

  


   ffmpeg -i test.png -i test.mp4 -i test.mp3  -y -filter_complex "[1:v]scale=1422:800[scale1],[scale1]rotate=0:c=black@0:ow=rotw(0):oh=roth(0)[rotate0],[0:v][rotate0]overlay=258.04:107.71[mediaoverlayout0],color=black@0:451x137[c1],[c1]setsar=1,drawtext=fontfile='/Windows/fonts/Peddana-Regular.ttf':text='ADITYA':fontsize=121.199:fontcolor=#1e8bc3:line_spacing=16.91,rotate=0:ow=rotw(0):oh=roth(0):c=black@0[rottext1],[mediaoverlayout0][rottext1]overlay=x=544.63:y=263.076[out]" -vcodec libx264 -map "[out]" -map 2:a -preset veryfast -c:a copy -pix_fmt yuv420p op.mp4