Repository: yt-dlp
Issue: Support muxing directly to explicitly specified output filename's container instead of default
Labels: enhancement,triage,core:post-processor

### DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

- [X] I understand that I will be **blocked** if I *intentionally* remove or skip any mandatory\* field

### Checklist

- [X] I'm requesting a feature unrelated to a specific site
- [X] I've looked through the [README](https://github.com/yt-dlp/yt-dlp#readme)
- [X] I've verified that I'm running yt-dlp version **2023.10.13** ([update instructions](https://github.com/yt-dlp/yt-dlp#update)) or later (specify commit)
- [X] I've searched [known issues](https://github.com/yt-dlp/yt-dlp/issues/3766) and the [bugtracker](https://github.com/yt-dlp/yt-dlp/issues?q=) for similar issues **including closed ones**. DO NOT post duplicates
- [X] I've read the [guidelines for opening an issue](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#opening-an-issue)

### Provide a description that is worded well enough to be understood

When downloading a file from a site that uses separate audio and video containers, yt-dlp makes its own decisions about which format should be used, e.g. on YouTube w/ vp9 video and opus audio, the result is muxed to a webm file. This is independent of the filename specified with the `-o filename.ext` option used.

If a filename has an extension that isn't the same as that yt-dlp would normally associate with the output container it chose, the actual filename generated would be filename.webm.mp4 (when `-o filename.mp4` was specified and yt-dlp picked a webm container). 

It is possible to use `--remux-video` or `--remux-audio` to override the final output container format, but as I understand it, this still first uses the internal format picked before remuxing as requested, and it requires specifying the remux container format separately.

My request is two-fold:
* When `-o filename.ext` is specified and `ext` is a recognized destination/remux format, it should be as if `--remux-[audio/video] ext` were specified, so it's not necessary to specify it manually,
* Additionally, as an optimization, when `--remux-[audio/video]` is used, I don't see a need to first go to, e.g. webm then convert again to mp4 instead of just muxing to mp4 directly - at least when there is an explicit muxing step required to merge the disparate audio and video sources or to convert from the original format (i.e. when the detected media isn't just a webm or mp4 that needs to be downloaded).

The verbose output below demonstrates the roundtripping to webm then to mp4 when `--remux-video mp4` is used; it does not show the behavior when using only `-o filename.mp4` which results in `filename.webm.mp4` but I don't think it's necessary to provide that separately as it's the same minus the last step, with a suffix tacked on to the destination file name.

### Provide verbose output that clearly demonstrates the problem

- [X] Run **your** yt-dlp command with **-vU** flag added (`yt-dlp -vU <your command line>`)
- [X] If using API, add `'verbose': True` to `YoutubeDL` params instead
- [X] Copy the WHOLE output (starting with `[debug] Command-line config`) and insert it below

### Complete Verbose Output

```shell
[debug] Command-line config: ['-vU', 'https://www.youtube.com/watch?v=bP5Zj4V7gi4&pp=ygUQcGFsZXN0aW5lIG1hc2h1cA%3D%3D', '-o', 'filename.mp4', '--remux-video', 'mp4']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out utf-8 (No ANSI), error utf-8 (No ANSI), screen utf-8 (No ANSI)
[debug] yt-dlp version nightly@2023.10.15.085452 [4e38e2ae9] (zip)
[debug] Python 3.11.4 (CPython x86_64 64bit) - Linux-6.2.0-1008-lowlatency-x86_64-with-glibc2.37 (OpenSSL 3.0.8 7 Feb 2023, glibc 2.37)
[debug] exe versions: ffmpeg 5.1.2 (setts), ffprobe 5.1.2
[debug] Optional libraries: brotli-1.0.9, certifi-2022.09.24, requests-2.28.1, secretstorage-3.3.3, sqlite3-3.40.1, urllib3-1.26.12
[debug] Proxy map: {}
[debug] Request Handlers: urllib
[debug] Loaded 1890 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp-nightly-builds/releases/latest
Available version: nightly@2023.10.28.155411, Current version: nightly@2023.10.15.085452
Current Build Hash: 96574da27638c9f111a2c8f4c76f74a24eaa4ac05b334fbde4c42fbe5a7e2ae2
[debug] Downloading _update_spec from https://github.com/yt-dlp/yt-dlp-nightly-builds/releases/latest/download/_update_spec
Updating to nightly@2023.10.28.155411 ...
ERROR: Unable to write to /usr/local/bin; Try running as administrator
[youtube] Extracting URL: https://www.youtube.com/watch?v=bP5Zj4V7gi4&pp=ygUQcGFsZXN0aW5lIG1hc2h1cA%3D%3D
[youtube] bP5Zj4V7gi4: Downloading webpage
[youtube] bP5Zj4V7gi4: Downloading ios player API JSON
[youtube] bP5Zj4V7gi4: Downloading android player API JSON
[debug] Loading youtube-nsig.9d15588c from cache
[debug] [youtube] Decrypted nsig k6ZKUHjhmtsScn => XghXptH34sBivw
[youtube] bP5Zj4V7gi4: Downloading m3u8 information
[debug] Sort order given by extractor: quality, res, fps, hdr:12, source, vcodec:vp9.2, channels, acodec, lang, proto
[debug] Formats sorted by: hasvid, ie_pref, quality, res, fps, hdr:12(7), source, vcodec:vp9.2(10), channels, acodec, lang, proto, size, br, asr, vext, aext, hasaud, id
[debug] Default format spec: bestvideo*+bestaudio/best
[info] bP5Zj4V7gi4: Downloading 1 format(s): 303+251
[debug] Invoking http downloader on "https://rr3---sn-vgqsknzr.googlevideo.com/videoplayback?expire=1699339676&ei=PIlJZaeEJNjeir4P7uaL4AE&ip=2001%3A559%3A8050%3A0%3A7beb%3A917a%3A264d%3A9830&id=o-AE-gVR3TJjMddcXfaMt4u6U_wzxMuRL5fCFGHdLeGzPW&itag=303&source=youtube&requiressl=yes&mh=eJ&mm=31%2C26&mn=sn-vgqsknzr%2Csn-p5qddn76&ms=au%2Conr&mv=m&mvi=3&pl=48&initcwndbps=736250&vprv=1&svpuc=1&mime=video%2Fwebm&gir=yes&clen=262981004&dur=584.780&lmt=1640438111034427&mt=1699317663&fvip=2&keepalive=yes&fexp=24007246&beids=24350018&c=IOS&txp=5535434&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Csvpuc%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=ANLwegAwRQIhAJv-xMjExqxvK7yie_D2XHAJ_tJqSZBuJ_fKengoZhhaAiAlaIRvtnuK5dptXZSc2IWS3J2wVVkQoAihl2Gw_YUgNg%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AM8Gb2swRAIgaeuS7QCqsHwf9QOxTXShaAEQ1lrPbkwPguTgTcBtteICIBMbnIkD9UFzQtaEE942DeLlETWZfOrBjAs2Ra_v2Hs2"
[download] Destination: filename.f303.webm

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[download] 100% of  250.80MiB in 00:00:25 at 10.02MiB/s  
[debug] Invoking http downloader on "https://rr3---sn-vgqsknzr.googlevideo.com/videoplayback?expire=1699339676&ei=PIlJZbatOO-lir4P3vG9yA4&ip=2001%3A559%3A8050%3A0%3A7beb%3A917a%3A264d%3A9830&id=o-ALy_RQEKDS74Fpuk40wtbeRyhLixAYUMNQzBSDz0qP_o&itag=251&source=youtube&requiressl=yes&mh=eJ&mm=31%2C26&mn=sn-vgqsknzr%2Csn-p5qddn76&ms=au%2Conr&mv=m&mvi=3&pl=48&initcwndbps=1905000&spc=UWF9f1nkM8sMqNuW7Z-PpQ9YVof6gbM&vprv=1&svpuc=1&mime=audio%2Fwebm&gir=yes&clen=9016262&dur=584.801&lmt=1640433629944450&mt=1699317663&fvip=2&keepalive=yes&fexp=24007246&beids=24350018&c=ANDROID&txp=5532434&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cspc%2Cvprv%2Csvpuc%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=ANLwegAwRAIgbv8pFHtiDw6CF2wjwaHt7S11a0zaGRz_b3GfNPUshCsCIEPi-w4DqvJp_ABTb4LWGkKhUsGy_hT9pE6qCuMDn9Cy&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AM8Gb2swRQIgcbcxJYA0KnIDBgWaMMi1XBh3e-ywoin-6vYmRih75Q4CIQCB61T6Ebcehrz080Kx2-D-2EXNPPgtQRgIwePlqxGM-A%3D%3D"
[download] Destination: filename.f251.webm

[download]   0.0% of    8.60MiB at  396.10KiB/s ETA 00:22
[download]   0.0% of    8.60MiB at 1022.09KiB/s ETA 00:08
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[download] 100.0% of    8.60MiB at    9.74MiB/s ETA 00:00
[download] 100% of    8.60MiB in 00:00:00 at 9.46MiB/s   
[Merger] Merging formats into "filename.webm"
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i file:filename.f303.webm -i file:filename.f251.webm -c copy -map 0:v:0 -map 1:a:0 -movflags +faststart file:filename.temp.webm
Deleting original file filename.f303.webm (pass -k to keep)
Deleting original file filename.f251.webm (pass -k to keep)
[VideoRemuxer] Remuxing video from webm to mp4; Destination: filename.mp4
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i file:filename.webm -map 0 -dn -ignore_unknown -c copy -movflags +faststart file:filename.mp4
Deleting original file filename.webm (pass -k to keep)
```