GoPro-VideoConcatenationAndProcessing.ps1

# When GoPro recordings fill a 4GB file, they continue into additional sequential files differentiatedby the second and third characters, such as "GH010136.MP4" to "GH040136.MP4" when recording "0136" spans four files (GH01, GH02, GH03, GH04).
# Group all MP4 files of that GH*.MP4 format by the recording number (last four numbers) and filter by any grouping that contains more than one file, indicating it spans multiple files.

# TODO: Edit for your own FFmpeg install location
# $ffmpegLocation = "~/Tools/ffmpeg/ffmpeg.exe"
$ffmpegLocation = "C:\ProgramData\chocolatey\bin\ffmpeg.exe"
$outputCombinedVideoSuffix = "-combined"

# Get all appropriate GoPro video segments without getting any previously generated combined video files (`-Exclude`).
foreach ($group in (Get-ChildItem GH*.MP4 -Exclude GH*${outputCombinedVideoSuffix}.MP4 | Group-Object -Property { $_.Name.Substring($_.Name.Length - ".MP4".Length - 4, 4) } | ? { ($_.Group | Measure-Object).Count -gt 1 })) {
    # The ffmpeg utility can concatenate a bunch of video files if they are in a text file with a filename list syntax. For each group, we generate that list in a text file, concatenate all the videos within that list via ffmpeg, and then delete the text file.
    $groupName = $group.Name # e.g., "0136" from "GH030136.MP4"
    $groupFiles = $group.Group # e.g., "GH010136.MP4", "GH020136.MP4", "GH030136.MP4"
    $concatFileListName = "${groupName}_files.txt"
    $concatFileListOutput = $groupFiles | Sort-Object -Property LastWriteTime | % { $_.Name } | % { "file '${_}'" }
    $concatFileListOutput > $concatFileListName
    $concatFileOutputName = "GH${groupName}${outputCombinedVideoSuffix}.mp4"
    & ${ffmpegLocation} -f concat -safe 0 -i ./$concatFileListName -c copy $concatFileOutputName
    Remove-Item $concatFileListName
}

## Prior system for processing a single long sports recording

$hockeyAgeGroup = "12U"
$hockeyMyTeam = "Cheyenne ${hockeyAgeGroup}"
$hockeyGameDate = "20201031"
$hockeyGameOpponents = "Wolverines"
$videoLocation = "" # " (tournament)" # " (stands)" # e.g., game type or video location
$gameSuffix = "" # " (2 of 2)" # e.g., series

$hockeyGameName = "${hockeyMyTeam} vs. ${hockeyGameOpponents}${videoLocation}${gameSuffix}"
$videoProjectName = "${hockeyGameDate} ${hockeyGameName}"

$ffmpegLocation = "C:\ProgramData\chocolatey\bin\ffmpeg.exe"
Get-ChildItem | Sort-Object -Property LastWriteTime | ? { $_.Name.EndsWith(".MP4") } | % { $_.Name } | % { "file '" + $_ + "'" } > mylist.txt
& ${ffmpegLocation} -f concat -safe 0 -i ./mylist.txt -c copy $videoProjectName-raw.mp4
#~/Tools/ffmpeg -f concat -safe 0 -i ./mylist.txt -c copy

# Manual step: Find start and end times for next commands

& ${ffmpegLocation} -i "./${videoProjectName}-raw.mp4" -ss 00:17:57 -to 01:05:42 -c copy "${videoProjectName}-trimmed.mp4"

#~/Tools/ffmpeg -i "./${videoProjectName}-raw.mp4" -ss 00:00:00 -to 00:56:00 -c copy "${videoProjectName}-trimmed.mp4"

# Process for YouTube

& ${ffmpegLocation} -i "./${videoProjectName}-trimmed.mp4" -vf yadif,format=yuv420p -force_key_frames "expr:gte(t,n_forced/2)" -c:v libx264 -crf 18 -bf 2 -c:a aac -q:a 1 -ac 2 -ar 48000 -use_editlist 0 -movflags +faststart "${videoProjectName}-processed.mp4"

Measure-Command { ~/Tools/ffmpeg/ffmpeg.exe -i "./${videoProjectName}-trimmed.mp4" -vf yadif,format=yuv420p -force_key_frames "expr:gte(t,n_forced/2)" -c:v libx264 -crf 18 -bf 2 -c:a aac -q:a 1 -ac 2 -ar 48000 -use_editlist 0 -movflags +faststart "${videoProjectName}-processed.mp4" }

Measure-Command { ~/Tools/ffmpeg -i "./${videoProjectName}-trimmed.mp4" -vf yadif,format=yuv420p -force_key_frames "expr:gte(t,n_forced/2)" -c:v libx264 -crf 18 -bf 2 -c:a aac -q:a 1 -ac 2 -ar 48000 -use_editlist 0 -movflags +faststart "${videoProjectName}-processed.mp4" }