How do I convert .webm files downloaded from 4chan threads to .mp4 files?

[soucouyant]

When i download a 4chan thread the files are in .webm format, is there a way to auto convert them to .mp4?

[mikf]

Use FFmpeg with an exec post processor.
The specifics might depend on your OS etc, but this works for me:

{
    "extractor": {
        "4chan": {
            "postprocessors": [
                {
                    "name": "exec",
                    "filter": "extension == 'webm'",
                    "command": ["ffmpeg", "-i", "{_path}", "{_path[:-5]}.mp4"]
                },
                {
                    "name": "exec",
                    "filter": "extension == 'webm'",
                    "command": "rm {_path}"
                }
            ]
        }
    }
}

[soucouyant]

this isn't working for me.

i'm getting

gallery-dl: error: unrecognized arguments: --config-open when i try to do gallery-dl --config-open

when i download a 4chan thread, nothing happens to convert after it downloads the .webms

my config file looks like this:

{
    "extractor": {
      "twitter":{
        "username": "_username_",
        "password": "_password_",
        "filename": "{author[name]}-{author[id]}({author[date]:%Y%m%d_%H%M%S})-{tweet_id}_{num}.{extension}",
      "reddit": {
        "client-id": "_client-id_",
        "user-agent": "Python:<_user_>:v1.0 (by /u/_username_)",
      "4chan": {
        "postprocessors": [
                {
                    "name": "exec",
                    "filter": "extension == 'webm'",
                    "command": ["ffmpeg", "-i", "{_path}", "{_path[:-5]}.mp4"]
                },
                {
                    "name": "exec",
                    "filter": "extension == 'webm'",
                    "command": "del {_path}"
                }
            ]
        }
    },
    "downloader": {

    },
    "output": {

    },
    "postprocessor": {

    }
}}}

(where the italics are personal data i write in.) is there any personal data/username etc. i needed to fill in for the 4chan post processor? i just copy and pasted what you typed up as is to the .json file

[Hrxn]

@soucouyant What's your gallery-dl version?

[soucouyant]

1.27.0-dev

when i try the command to update it only shows me that a new update is available, but doesn't update

[mikf]

when i download a 4chan thread, nothing happens to convert after it downloads the .webms

Because all your options are inside extractor.twitter.

Try this config

{
    "extractor": {
      "twitter":{
        "username": "_username_",
        "password": "_password_",
        "filename": "{author[name]}-{author[id]}({author[date]:%Y%m%d_%H%M%S})-{tweet_id}_{num}.{extension}"
      },
      "reddit": {
        "client-id": "_client-id_",
        "user-agent": "Python:<_user_>:v1.0 (by /u/_username_)"
      },
      "4chan": {
        "postprocessors": [
            {
                "name": "exec",
                "filter": "extension == 'webm'",
                "command": ["ffmpeg", "-i", "{_path}", "{_path[:-5]}.mp4"]
            },
            {
                "name": "exec",
                "filter": "extension == 'webm'",
                "command": "del {_path}"
            }
        ]
      }
    },
    "downloader": {

    },
    "output": {

    },
    "postprocessor": {

    }
}

The "the command to update" only works for executables. If you've installed gallery-dl in a different way, you should use that method to update (e.g. py -m pip install -U gallery-dl). The update feature was implemented at some point during v1.27.0 development, so maybe it is simply not done in your 1.27.0-dev version.

You also don't need --config-open for anything here. That's just meant as a convenience or user-friendly method for opening the config file in a text editor.

---

At the very least, I've found a stupid inconsequential bug regarding update options:

gallery-dl/gallery_dl/option.py

Line 210 in c514752

if util.EXECUTABLE or 1:

[soucouyant]

that was it - thank you!