[Feature] Add manual post processing arguments

[Hash6232]

Just a simple toggle/input combo pair in Advanced options or in a dedicated menu so I can make yt-dlp re-encode/remux downloaded videos on the fly.

[ ] Enable remux  
[x] Enable re-encode  

Format: [ mp4 ▼ ]
        ├─ avi
        ├─ flv
        ├─ gif
        ├─ mkv
        ├─ mov
        ├─ mp4
        ├─ webm
        ├─ aac
        ├─ aiff
        ├─ alac
        ├─ flac
        ├─ m4a
        ├─ mka
        ├─ mp3
        ├─ ogg
        ├─ opus
        ├─ vorbis
        └─ wav

Post processing arguments: [_______________________________________]
                           (e.g. VideoConvertor:-vf scale=-1:360)

I was thinking of a pair of two mutually exclusive toggles which enable remux or re-encoding, then a select picker that lets you choose a format from a list (both remux and re-encode support the same values) and finally an input field (enabled only when choosing re-encode) where you can paste the necessary ppa arguments.

Bonus points for a way to save these as presets so I can choose the right ppa arguments on the fly when selecting re-encode:

--audio-format FORMAT           Format to convert the audio to when -x is
                                used. (currently supported: best (default),
                                aac, alac, flac, m4a, mp3, opus, vorbis,
                                wav). You can specify multiple rules using
                                similar syntax as --remux-video
--audio-quality QUALITY         Specify ffmpeg audio quality to use when
                                converting the audio with -x. Insert a value
                                between 0 (best) and 10 (worst) for VBR or a
                                specific bitrate like 128K (default 5)
--remux-video FORMAT            Remux the video into another container if
                                necessary (currently supported: avi, flv,
                                gif, mkv, mov, mp4, webm, aac, aiff, alac,
                                flac, m4a, mka, mp3, ogg, opus, vorbis,
                                wav). If the target container does not
                                support the video/audio codec, remuxing will
                                fail. You can specify multiple rules; e.g.
                                "aac>m4a/mov>mp4/mkv" will remux aac to m4a,
                                mov to mp4 and anything else to mkv
--recode-video FORMAT           Re-encode the video into another format if
                                necessary. The syntax and supported formats
                                are the same as --remux-video
--postprocessor-args NAME:ARGS  Give these arguments to the postprocessors.
                                Specify the postprocessor/executable name
                                and the arguments separated by a colon ":"
                                to give the argument to the specified
                                postprocessor/executable. Supported PP are:
                                Merger, ModifyChapters, SplitChapters,
                                ExtractAudio, VideoRemuxer, VideoConvertor,
                                Metadata, EmbedSubtitle, EmbedThumbnail,
                                SubtitlesConvertor, ThumbnailsConvertor,
                                FixupStretched, FixupM4a, FixupM3u8,
                                FixupTimestamp and FixupDuration. The
                                supported executables are: AtomicParsley,
                                FFmpeg and FFprobe. You can also specify
                                "PP+EXE:ARGS" to give the arguments to the
                                specified executable only when being used by
                                the specified postprocessor. Additionally,
                                for ffmpeg/ffprobe, "_i"/"_o" can be
                                appended to the prefix optionally followed
                                by a number to pass the argument before the
                                specified input/output file, e.g. --ppa
                                "Merger+ffmpeg_i1:-v quiet". You can use
                                this option multiple times to give different
                                arguments to different postprocessors.
                                (Alias: --ppa)

[nlogozzo]

Just a simple toggle/input combo pair in Advanced options or in a dedicated menu so I can make yt-dlp re-encode/remux downloaded videos on the fly.

What is the need for this? Parabolic chooses already to remux/recode a video depending on the file format you choose from the list.
Most of the times it remuxes unless it's an webm with requires a recode:

arguments.push_back("--remux-video");
arguments.push_back(StringHelpers::lower(m_fileType.str()));
if(m_fileType == MediaFileType::WEBM)
{
    arguments.push_back("--recode-video");
    arguments.push_back(StringHelpers::lower(m_fileType.str()));
}

finally an input field (enabled only when choosing re-encode) where you can paste the necessary ppa arguments.

As far as adding a post-processing arguments field to advanced options of a download, I could do that.

[Hash6232]

What is the need for this? Parabolic chooses already to remux/recode a video depending on the file format you choose from the list.

My bad, I somehow missed the very first entry in the "Add Download" modal. Regarding post processing, an area in "Preferences" where I can add key+value pairs can definitely be handy. Although a simple input field to inject the ppa will do the trick, most of the times this might become a routine depending on the source of the files and where one plans to upload them. Having a list of presets (saved beforehand in "Preferences") to chose from and a input field as fallback is how I've seen other frontends tackle this feature

[nlogozzo]

Having a list of presets (saved beforehand in "Preferences") to chose from and a input field as fallback is how I've seen other frontends tackle this feature

This sounds like a good idea - will implement it !