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• How to improve this Powershell script ?

  3 janvier 2023, par Joan Venge

  I wrote a powershell script that merges go pro video files if they have multiple files. It works when the videos are at the root drive i.e. C :, but otherwise not. The mergevideos.txt file is not created if I run the script from a different directory. Or the txt is created but it's empty. Not sure what's going on when run from a different directory.

  


  So is there a way to fix these issues and refactor this code to make it better ? Ideally I want the script to automatically look at the directory it's in or allows me to specify the directory it should work in so I can just call it from the same location but the videos can be anywhere.

  


  $path = "C:/NewVideos/"
$oldvids = Get-ChildItem -Path $path *.mp4
foreach ($oldvid in $oldvids) {
    $curpath = $oldvid.DirectoryName

    $name = [System.IO.Path]::GetFileNameWithoutExtension($oldvid)
    $ext = [System.IO.Path]::GetExtension($oldvid)
    if ($name.StartsWith("GX01") -and !($name.EndsWith("_merged")))
    {
        $newvid = $curpath + $name + "_merged" + $ext
        if ([System.IO.File]::Exists($newvid))
        {
            Write-Output "$name | ALREADY MERGED"
            continue
        }

        $count = 1

        for ($num = 2; $num -lt 10; $num++)
        {
            $nextpart = $name.Replace("GX01", "GX0" + $num)
            if ([System.IO.File]::Exists($curpath + "/" + $nextpart + $ext))
            {
                $count = $num
            }
        }

        if ($count -eq 1)
        {
            Write-Output "$name | SINGLE VIDEO"
            continue
        }

        $mergefile = $curpath + "mergevideos.txt"
        if (!(Test-Path $mergefile))
        {
            New-Item -path $curpath -name mergevideos.txt -type "file"
        }

        Clear-Content $mergefile

        for ($num = 1; $num -le $count; $num++)
        {
            $nextpart = $name.Replace("GX01", "GX0" + $num)
            $videofilename = "file '" + $nextpart + $ext + "'"
            Add-Content $mergefile $videofilename
        }

         Write-Output "$name | MERGING  $count VIDEOS"
         ffmpeg -f concat -safe 0 -i $mergefile -c copy $newvid
    }
}


  


• ffmpeg headphone convolution audio filter with non standard channel layouts

  4 février 2021, par dts350z

  I am successfully using ffmpeg's headphone convolution audio filter (see ffmpeg filters documentation section 8.78) to make binaural versions of surround sound with up to 16 channels. As long as the channel layouts are recognized by ffmpeg.

  


  I have 32 IRs (16 stereo pairs) in one file and can use it for :

  


  Stereo
5.1,
7.1,
and
7.1.4.4 (16 channels).

  


  The order of the pairs in the IR file is :

  


  FL|FR|FC|LFE|BL|BR|SL|SR|FLC|FRC|TFL|TFR|BC|TC|TBL|TBR

  


  So all of those formats are subsets of the IR file, and in order.

  


  Surround input files, with more than 8 channels, have channels assigned in their headers by previously applied ffmpeg commands.

  


  Such as :

  


  ffmpeg.exe" -y -i %%x -acodec pcm_s24le  -af "pan=7.1+TFL+TFR+TBL+TBR|FL=c0|FR=c1|FC=c2|LFE=c3|SL=c6|SR=c7|BL=c4|BR=c5|TFL=c8|TFR=c9|TBL=c10|TBR=c11" "%%~nx_12ch_mapped.wav"


  


  for 12 channels and :

  


  ffmpeg.exe" -y -i %%x -acodec pcm_s24le -filter_complex "pan=FL+FR+FC+LFE+BL+BR+SL+SR+FLC+FRC+TFL+TFR+BC+TC+TBL+TBR|FL=c0|FR=c1|FC=c2|LFE=c3|BL=c4|BR=c5|SL=c6|SR=c7|FLC=c8|FRC=c9|TFL=c10|TFR=c11|BC=c12|TC=c13|TBL=c14|TBR=c15" "%%~nx_16ch_mapped.wav"


  


  for 16 channels.

  


  So here is a working convolution command. Again it works for stereo, 5.1, 7.1 and 16 channel surround input files (only the gain needs changing for the different channel count inputs) :

  


  ffmpeg.exe" -hide_banner -y -i "%%~nx_48KHz.wav" -i "%parent%\My-IR.wav" -filter_complex "[1:0]pan=stereo|c0=c0|c1=c1[fl];[1:0]pan=stereo|c0=c2|c1=c3[fr];[1:0]pan=stereo|c0=c4|c1=c5[fc];[1:0]pan=stereo|c0=c6|c1=c7[lfe];[1:0]pan=stereo|c0=c8|c1=c9[bl];[1:0]pan=stereo|c0=c10|c1=c11[br];[1:0]pan=stereo|c0=c12|c1=c13[sl];[1:0]pan=stereo|c0=c14|c1=c15[sr];[1:0]pan=stereo|c0=c16|c1=c17[flc];[1:0]pan=stereo|c0=c18|c1=c19[frc];[1:0]pan=stereo|c0=c20|c1=c21[tfl];[1:0]pan=stereo|c0=c22|c1=c23[tfr];[1:0]pan=stereo|c0=c24|c1=c25[bc];[1:0]pan=stereo|c0=c26|c1=c27[tc];[1:0]pan=stereo|c0=c28|c1=c29[tbl];[1:0]pan=stereo|c0=c30|c1=c31[tbr];[0:a][fl][fr][fc][lfe][bl][br][sl][sr][flc][frc][tfl][tfr][bc][tc][tbl][tbr]headphone=gain=32:map=FL|FR|FC|LFE|BL|BR|SL|SR|FLC|FRC|TFL|TFR|BC|TC|TBL|TBR[fh]" -map [fh]:a  "%%~nx_h_binaural.flac"


  


  Which gives results :

  


  Guessed Channel Layout for Input Stream #0.0 : hexadecagonal
Input #0, wav, from 'Black Hole Sun_7.1.4.4_16ch_mapped_48KHz.wav':
  Duration: 00:05:19.19, bitrate: 24576 kb/s
    Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, hexadecagonal, flt, 24576 kb/s
Input #1, wav, from 'D:\Google Drive\16ch Virtual_Surround\\My-IR.wav':
  Duration: 00:00:01.00, bitrate: 49194 kb/s
    Stream #1:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 32 channels, flt, 49152 kb/s
Stream mapping:
  Stream #0:0 (pcm_f32le) -> headphone:in0
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  headphone -> Stream #0:0 (flac)
Press [q] to stop, [?] for help
[Parsed_pan_0 @ 000001c26da4b180] Pure channel mapping detected: 0 1
[Parsed_pan_1 @ 000001c26da4b680] Pure channel mapping detected: 2 3
[Parsed_pan_2 @ 000001c26da4b780] Pure channel mapping detected: 4 5
[Parsed_pan_3 @ 000001c26da4bc80] Pure channel mapping detected: 6 7
[Parsed_pan_4 @ 000001c26da4ab80] Pure channel mapping detected: 8 9
[Parsed_pan_5 @ 000001c26da4b280] Pure channel mapping detected: 10 11
[Parsed_pan_6 @ 000001c26da4a280] Pure channel mapping detected: 12 13
[Parsed_pan_7 @ 000001c26da4b980] Pure channel mapping detected: 14 15
[Parsed_pan_8 @ 000001c26da4af80] Pure channel mapping detected: 16 17
[Parsed_pan_9 @ 000001c26da4b880] Pure channel mapping detected: 18 19
[Parsed_pan_10 @ 000001c26da4b080] Pure channel mapping detected: 20 21
[Parsed_pan_11 @ 000001c26da4be80] Pure channel mapping detected: 22 23
[Parsed_pan_12 @ 000001c26da4ba80] Pure channel mapping detected: 24 25
[Parsed_pan_13 @ 000001c26da4a180] Pure channel mapping detected: 26 27
[Parsed_pan_14 @ 000001c26da4b380] Pure channel mapping detected: 28 29
[Parsed_pan_15 @ 000001c26da4a580] Pure channel mapping detected: 30 31
[flac @ 000001c26d605440] encoding as 24 bits-per-sample
Output #0, flac, to 'Black Hole Sun_7.1.4.4_16ch_mapped_h_binaural.flac':
  Metadata:
    encoder         : Lavf58.33.100
    Stream #0:0: Audio: flac, 48000 Hz, stereo, s32 (24 bit), 128 kb/s (default)
    Metadata:
      encoder         : Lavc58.59.102 flac
size=   64546kB time=00:05:19.18 bitrate=1656.6kbits/s speed=3.12x
video:0kB audio:64538kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.012541%


  


  However for channel layouts that need to skip some of the IRs, such as 4.0, 5.0, and 7.1.4 (12 channels) I can't figure out how to make it work. In the 12 channel case, I even cut the IR file down to 24 channels (12 pairs) and tried this :

  


  ffmpeg.exe" -hide_banner -y -i "%%~nx_48KHz.wav" -i "%parent%\IR-Files\A16_12ch_IR 12_Pairs_A16_Order.wav" -filter_complex "[1:0]pan=stereo|c0=c0|c1=c1[fl];[1:0]pan=stereo|c0=c2|c1=c3[fr];[1:0]pan=stereo|c0=c4|c1=c5[fc];[1:0]pan=stereo|c0=c6|c1=c7[lfe];[1:0]pan=stereo|c0=c8|c1=c9[bl];[1:0]pan=stereo|c0=c10|c1=c11[br];[1:0]pan=stereo|c0=c12|c1=c13[sl];[1:0]pan=stereo|c0=c14|c1=c15[sr];[1:0]pan=stereo|c0=c16|c1=c17[tfl];[1:0]pan=stereo|c0=c18|c1=c19[tfr];[1:0]pan=stereo|c0=c20|c1=c21[tbl];[1:0]pan=stereo|c0=c22|c1=c23[tbr];[0:a][fl][fr][fc][lfe][bl][br][sl][sr][tfl][tfr][tbl][tbr]headphone=gain=10:map=FL|FR|FC|LFE|BL|BR|SL|SR|TFL|TFR|TBL|TBR[fh]" -map [fh]:a  "%%~nx_h_binaural.flac"


  


  But it gives the following output :

  


  Input #0, wav, from 'Mistral Wind m_12ch_mapped norm 0dB_48KHz.wav':
  Duration: 00:07:26.43, bitrate: 18432 kb/s
    Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 12 channels, flt, 18432 kb/s
Input #1, wav, from 'D:\Google Drive\16ch Virtual_Surround\\IR-Files\A16_12ch_IR 12_Pairs_A16_Order.wav':
  Duration: 00:00:01.00, bitrate: 36866 kb/s
    Stream #1:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 24 channels, flt, 36864 kb/s
Stream mapping:
  Stream #0:0 (pcm_f32le) -> headphone:in0
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  headphone -> Stream #0:0 (flac)
Press [q] to stop, [?] for help
[auto_resampler_0 @ 000002a4ffb4f980] Cannot select channel layout for the link between filters auto_resampler_0 and Parsed_headphone_12.
[auto_resampler_0 @ 000002a4ffb4f980] Unknown channel layouts not supported, try specifying a channel layout using 'aformat=channel_layouts=something'.
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!


  


  and I can't figure out where to put the suggested aformat=channel_layouts=something.

  


  Suggestions ?

  


• recording live stream video from tv card using ffmpeg at window [on hold]

  6 décembre 2013, par user2688423

  I want to record live stream every 1 second from tv card(tv signal) using ffmpeg in window.

  first of all, to record live video from tv card, I tried below.

  1. First I tried this.

  ffmpeg -list_devices true -f dshow -i dummy

  then the result is

  " [dshow @ 000000000024e6fe0] DirectShow video devices
  [dshow @000000000024e6fe0] "SKYTV HD USB Maxx Video Capture"
  [dshow @
  000000000024e6fe0] DirectShow audio devices
  [dshow @
  000000000024e6fe0] "Analog Audio In(SKYTV HD USB Ma" "

  so I tried

  ffmpeg -f dshow -i video="SKYTV HD USB Maxx Video Capture" -r 20
  -threads 0 D ://test.mkv

  But it didn't work. the Error message is

  "[dshow@000000000034d920] Could not run filter
  video=SKYTV HD USB
  Maxx Video Capture : Input/output error"

  I use the device called 'SKYTV HD USB Maxx Video Capture' for getting tv signal(TV card).

  1. The First way deosn't work, I tried different way.

  ffmpeg -y -f vfwcap -i list

  then the result is
  "

  [dshow @ 00000000003fd760] Driver 0

  [dshow @ 00000000003fd760] Microsoft WDM Image Capture (Win32)
  [dshow @ 00000000003fd760] Version : 6.1.7601.17514 list : Input/output error

  "

  so I tried

  ffmpeg -y -f vfwcap -r 25 -i 0 D ://out.mp4

  then, there is some out.mp4 file in D drive but the file is nothing.
  (I think it is not TV signal)

  what should i do to record live video every 1 second from tv card(tv signal) using ffmpeg in window ? And How can I set channel at tvcard(Because I want to get tv signal, there are many channels).

  Please help..!