Repository: yt-dlp
Issue: --merge-output-format mkv / Resulting file is missing bit rate metadata
Labels: external issue,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 have **updated yt-dlp to nightly or master** ([update instructions](https://github.com/yt-dlp/yt-dlp#update-channels))
- [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

Download any video from Youtube using the command line option + argument `--merge-output-format mkv`.

Install [MediaInfo](https://mediaarea.net/en/MediaInfo/Download).

Right click the file and select MediaInfo. Observe that the report will show only "Overall bit rate", there is no bit rate shown for the separate video stream or the audio stream.

Install [MKVToolNix](https://mkvtoolnix.download/downloads.html). Launch MKVToolNix GUI, drag the downloaded file into the source file window, then start multiplexing to a new file. Right click the created file, then select MediaInfo. Observe that the report shows the bit rates for the separate video stream and audio stream.

Can yt-dlp be fixed so that it will include the bit rates for the separate video and audio streams?

### 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
E:\USER\temp_ytdl>yt-dlp.exe -vU -f "(bv*[vcodec~='^(avc|h264)']+ba[acodec~='^(m
p4a|aac)']) / (bv*+ba/b)" --merge-output-format mkv "https://www.youtube.com/wat
ch?v=P9ZFOPj7Q7Y"
[debug] Command-line config: ['-vU', '-f', "(bv*[vcodec~='^(avc|h264)']+ba[acode
c~='^(mp4a|aac)']) / (bv*+ba/b)", '--merge-output-format', 'mkv', 'https://www.y
outube.com/watch?v=P9ZFOPj7Q7Y']
[debug] Encodings: locale cp1252, fs utf-8, pref cp1252, out utf-8 (No VT), erro
r utf-8 (No VT), screen utf-8 (No VT)
[debug] yt-dlp version stable@2024.04.09 from yt-dlp/yt-dlp [ff0779267] (win_exe
)
[debug] Python 3.8.10 (CPython AMD64 64bit) - Windows-2008ServerR2-6.1.7601-SP1
(OpenSSL 1.1.1k  25 Mar 2021)
[debug] exe versions: ffmpeg N-93824-g479a5f644f (fdk), ffprobe N-89595-g40d4b13
228, rtmpdump 2.4-20151223-gfa8646d-OpenSSL_1.0.2n-x86_64-static
[debug] Optional libraries: Cryptodome-3.20.0, brotli-1.1.0, certifi-2024.02.02,
 curl_cffi-0.5.10, mutagen-1.47.0, requests-2.31.0, sqlite3-3.35.5, urllib3-2.2.
1, websockets-12.0
[debug] Proxy map: {}
[debug] Request Handlers: urllib, requests, websockets, curl_cffi
[debug] Loaded 1810 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releas
es/latest
Latest version: stable@2024.04.09 from yt-dlp/yt-dlp
yt-dlp is up to date (stable@2024.04.09 from yt-dlp/yt-dlp)
[youtube] Extracting URL: https://www.youtube.com/watch?v=P9ZFOPj7Q7Y
[youtube] P9ZFOPj7Q7Y: Downloading webpage
[youtube] P9ZFOPj7Q7Y: Downloading ios player API JSON
[youtube] P9ZFOPj7Q7Y: Downloading android player API JSON
WARNING: [youtube] Skipping player responses from android clients (got player re
sponses for video "aQvGIIdgFDM" instead of "P9ZFOPj7Q7Y")
[debug] [youtube] Extracting signature function js_74a3a562_105
[youtube] P9ZFOPj7Q7Y: Downloading player 74a3a562
[debug] Saving youtube-sigfuncs.js_74a3a562_105 to cache
[debug] [youtube] Extracting nsig function with jsinterp
[debug] Saving youtube-nsig.74a3a562 to cache
[debug] [youtube] Decrypted nsig bUYNN4hIPhbqTGAIMGM => DqR0bApKIw-0mg
[debug] Loading youtube-nsig.74a3a562 from cache
[debug] [youtube] Decrypted nsig KJrrNvefEpd1t5X9JTr => sB_8fP3heXFuew
[debug] [youtube] Extracting signature function js_74a3a562_101
[debug] Saving youtube-sigfuncs.js_74a3a562_101 to cache
[youtube] P9ZFOPj7Q7Y: 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, ha
saud, id
[info] P9ZFOPj7Q7Y: Downloading 1 format(s): 135+140
[debug] Invoking http downloader on "https://rr5---sn-nx57ynsk.googlevideo.com/v
ideoplayback?expire=1715793623&ei=d5pEZqKqDNHnsfIP7P6rkAo&ip=51.81.168.52&id=o-A
HZSqT2OHm5g6qKA1rjUO6pbk3YEMCz25VSA4gZoAYRh&itag=135&source=youtube&requiressl=y
es&xpc=EgVo2aDSNQ%3D%3D&mh=bt&mm=31%2C26&mn=sn-nx57ynsk%2Csn-tt1elnel&ms=au%2Con
r&mv=m&mvi=5&pl=19&initcwndbps=588750&vprv=1&svpuc=1&mime=video%2Fmp4&rqh=1&gir=
yes&clen=1288262&dur=216.951&lmt=1406543830951951&mt=1715771575&fvip=5&keepalive
=yes&c=IOS&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cxpc%2Cvp
rv%2Csvpuc%2Cmime%2Crqh%2Cgir%2Cclen%2Cdur%2Clmt&sig=AJfQdSswRQIhANT_tfDzENxNF8z
iW8ZerRGQLLbi5fWrMODYjuf_YQSyAiBDPhMufou1NCmAZz-SGwGsRwUbzqRCStWXl5MJeLU1Mw%3D%3
D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AHWaYeowRQIgOR23
dHBwYYURgRoakgsfvqU-zoVQfMAv8J9TXr6759ICIQCAilSyS2d3P7P4FRVMr7C5OTgA4BRNAb7Ae4Z2
VHpCZw%3D%3D"
[debug] File locking is not supported. Proceeding without locking
[download] Destination: Book Of Love - Late Show (1986) [P9ZFOPj7Q7Y].f135.mp4
[download] 100% of    1.23MiB in 00:00:00 at 15.75MiB/s
[debug] Invoking http downloader on "https://rr5---sn-nx57ynsk.googlevideo.com/v
ideoplayback?expire=1715793623&ei=d5pEZqKqDNHnsfIP7P6rkAo&ip=51.81.168.52&id=o-A
HZSqT2OHm5g6qKA1rjUO6pbk3YEMCz25VSA4gZoAYRh&itag=140&source=youtube&requiressl=y
es&xpc=EgVo2aDSNQ%3D%3D&mh=bt&mm=31%2C26&mn=sn-nx57ynsk%2Csn-tt1elnel&ms=au%2Con
r&mv=m&mvi=5&pl=19&initcwndbps=588750&vprv=1&svpuc=1&mime=audio%2Fmp4&rqh=1&gir=
yes&clen=3485682&dur=217.082&lmt=1406543849090076&mt=1715771575&fvip=5&keepalive
=yes&c=IOS&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cxpc%2Cvp
rv%2Csvpuc%2Cmime%2Crqh%2Cgir%2Cclen%2Cdur%2Clmt&sig=AJfQdSswRAIgKxJ4kfmosu_5535
-DVni1j-SVsVW_KP_5GQKcPAPTBECIE9Qu075JSkCuALloELSDpiHTMe5jJPyu_M0uq9rzLaV&lspara
ms=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AHWaYeowRQIgOR23dHBwYYUR
gRoakgsfvqU-zoVQfMAv8J9TXr6759ICIQCAilSyS2d3P7P4FRVMr7C5OTgA4BRNAb7Ae4Z2VHpCZw%3
D%3D"
[download] Destination: Book Of Love - Late Show (1986) [P9ZFOPj7Q7Y].f140.m4a
[download] 100% of    3.32MiB in 00:00:00 at 30.44MiB/s
[Merger] Merging formats into "Book Of Love - Late Show (1986) [P9ZFOPj7Q7Y].mkv
"
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i "file:Book Of Lo
ve - Late Show (1986) [P9ZFOPj7Q7Y].f135.mp4" -i "file:Book Of Love - Late Show
(1986) [P9ZFOPj7Q7Y].f140.m4a" -c copy -map 0:v:0 -map 1:a:0 -movflags +faststar
t "file:Book Of Love - Late Show (1986) [P9ZFOPj7Q7Y].temp.mkv"
Deleting original file Book Of Love - Late Show (1986) [P9ZFOPj7Q7Y].f140.m4a (p
ass -k to keep)
Deleting original file Book Of Love - Late Show (1986) [P9ZFOPj7Q7Y].f135.mp4 (p
ass -k to keep)

---------------------------------------------------

General
Unique ID                                : 82742846397301302004546982710879441108 (0x3E3FB14B5A44C52500940031778FD0D4)
Complete name                            : E:\USER\temp_ytdl\Book Of Love - Late Show (1986) [P9ZFOPj7Q7Y].mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 4.50 MiB
Duration                                 : 3 min 37 s
Overall bit rate                         : 174 kb/s
Frame rate                               : 29.970 FPS
Writing application                      : Lavf58.27.103
Writing library                          : Lavf58.27.103
ErrorDetectionType                       : Per level 1

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L3.1
Format settings                          : CABAC / 3 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 3 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 3 min 36 s
Width                                    : 854 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 16:9
Active width                             : 486 pixels
Active display aspect ratio              : 1.010
Frame rate mode                          : Constant
Frame rate                               : 29.970 (30000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Default                                  : Yes
Forced                                   : No

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : A_AAC-2
Duration                                 : 3 min 37 s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 44.1 kHz
Frame rate                               : 43.066 FPS (1024 SPF)
Compression mode                         : Lossy
Default                                  : Yes
Forced                                   : No

---------------------------------------------------

General
Unique ID                                : 280540080071693167673469279249637603123 (0xD30E0DD84212962509948D5234607733)
Complete name                            : E:\USER\temp_ytdl\Book Of Love - Late Show (1986) (MKVToolNix).mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 4.46 MiB
Duration                                 : 3 min 37 s
Overall bit rate                         : 172 kb/s
Frame rate                               : 29.970 FPS
Encoded date                             : 2024-05-15 11:22:32 UTC
Writing application                      : mkvmerge v48.0.0 ('Fortress Around Your Heart') 64-bit
Writing library                          : libebml v1.4.0 + libmatroska v1.6.0 / Lavf58.27.103

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L3.1
Format settings                          : CABAC / 3 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 3 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 3 min 36 s
Bit rate                                 : 44.4 kb/s
Width                                    : 854 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 16:9
Active width                             : 486 pixels
Active display aspect ratio              : 1.010
Frame rate mode                          : Constant
Frame rate                               : 29.970 (30000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.004
Stream size                              : 1.15 MiB (26%)
Language                                 : English
Default                                  : Yes
Forced                                   : No

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : A_AAC-2
Duration                                 : 3 min 37 s
Bit rate                                 : 126 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 44.1 kHz
Frame rate                               : 43.066 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 3.25 MiB (73%)
Language                                 : English
Default                                  : Yes
Forced                                   : No
```