VLC trancode avi to mp4 (h.264) not playable on iOS

Question

I'm using VLC (vlckit) transcode media option but the mp4 is not playable within iOS natively (it does play on all other platforms):

VLC Transcode logs:

$":sout=#transcode{venc={module=avcodec{codec=h264_videotoolbox}, vcodec=h264},venc={module=vpx{quality-mode=2},vcodec=VP80},samplerate=44100,soverlay}:file{dst={destination},mux=ts}". 

When attempting to save the file to the ios photo library:

Info (36494) / mediaserverd(CoreMedia): <<<< FigCustomURLHandling >>>> curll_installHandlerOnQueue: 0x10339c380: handler: 0x10dfd6920 priority: 800
Error (35388) / assetsd(PhotoLibraryServices): Video <private> cannot be saved to the photo library: Error Domain=AVFoundationErrorDomain Code=-11829 UserInfo={NSUnderlyingError=0x128e46e70 {Error Domain=NSOSStatusErrorDomain Code=-12848}, NSLocalizedFailureReason=<private>, NSURL=<private>, NSLocalizedDescription=<private>}
Info (35388) / assetsd(PhotoLibraryServices): [saveAssetJob:imageSurface:previewImageSurface:completionHandler:] completed job VideoSaveJob assetUUID 36CEDD80-2E1F-4CDB-A05E-5D81B23DE6A3 with generated video destination path <private>
Info (36494) / mediaserverd(MediaToolbox): <<< URLAsset >>> URLAssetFinalize: Called for asset 0x103330580
Info (36494) / mediaserverd(CoreMedia): <<<< FigCustomURLHandling >>>> curll_invalidateOnQueue: 0x10339c360 called
Info (38616) / Kleensight.Mobile.iOS: Error writing to library: Error Domain=ALAssetsLibraryErrorDomain Code=-3302 "Invalid data" UserInfo={NSLocalizedFailureReason=There was a problem writing this asset because the data is invalid and cannot be viewed or played., NSUnderlyingError=0x2833a3c90 {Error Domain=ALAssetsLibraryErrorDomain Code=-3302 "Invalid data" UserInfo={NSLocalizedFailureReason=There was a problem writing this asset because the data is invalid and cannot be viewed or played., NSUnderlyingError=0x2833dccc0 {Error Domain=com.apple.photos.error Code=13 "Operation failed because video file is invalid and cannot be played." UserInfo={NSLocalizedDescription=Operation failed because video file is invalid and cannot be played.}}, NSLocalizedRecoverySuggestion=Try with different data, NSLocalizedDescription=Invalid data}}, NSLocalizedRecoverySuggestion=Try with different data, NSLocalizedDescription=Invalid data}

Any suggestions on how to tweak these VLC transcode parameters so the output mp4 file is playable on iOS? I've read that only certain h.264 profiles work on iOS (https://developer.apple.com/documentation/videotoolbox/vtcompressionsession/compression_properties/profile_and_level_constants)

2021-05-18 11:22:51.868 [32755:14865973] [Debug] libvlc:Copyright © 1996-2019 the VideoLAN team
2021-05-18 11:22:51.868 [32755:14865911] [Debug] libvlc:VLC media player - 3.0.9 Vetinari
2021-05-18 11:22:51.868 [32755:14865850] [Debug] libvlc:revision 3.0.8-262-gb7d4bd2972
2021-05-18 11:22:51.868 [32755:14865846] [Debug] libvlc:configured with /Users/Martz/Projects/vlckit/libvlc/vlc/configure  '--prefix=/Users/Martz/Projects/vlckit/libvlc/vlc/install-iPhoneOS/arm64' '--host=aarch64-apple-darwin14' '--with-contrib=/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-aarch64-apple-darwin14-aarch64' '--enable-static' '--enable-dvbpsi' '--enable-avcodec' '--disable-macosx' '--disable-macosx-qtkit' '--disable-macosx-avfoundation' '--disable-shared' '--enable-opus' '--disable-faad' '--disable-lua' '--disable-a52' '--enable-fribidi' '--disable-qt' '--disable-skins2' '--disable-vcd' '--disable-vlc' '--disable-vlm' '--disable-nls' '--disable-sse' '--disable-notify' '--enable-live555' '--enable-realrtsp' '--enable-swscale' '--disable-projectm' '--enable-libass' '--enable-libxml2' '--disable-goom' '--disable-dvdread' '--disable-dvdnav' '--disable-bluray' '--disable-linsys' '--disable-libva' '--disable-gme' '--disable-tremor' '--enable-vorbis' '--disable-fluidsynth' '--disable-jack' '--disable-pulse' '--disable-mtp' '--enable-ogg' '--enable-speex' '--enable-theora' '--enable-flac' '--disable-screen' '--enable-freetype' '--enable-taglib' '--enable-smb2' '--disable-mmx' '--disable-sparkle' '--disable-addonmanagermodules' '--disable-mad' 'host_alias=aarch64-apple-darwin14' 'CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' 'CFLAGS=-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk -arch arm64 -O3 -g -miphoneos-version-min=8.4 -DNDEBUG' 'LDFLAGS=-arch arm64 -Wl,-ios_version_min,8.4' 'CPPFLAGS=-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk -arch arm64 -O3 -g -miphoneos-version-min=8.4' 'CXX=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++' 'CXXFLAGS=-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk -arch arm64 -O3 -g -miphoneos-version-min=8.4' 'OBJC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' 'OBJCFLAGS=-O3 -g' 'CCAS=gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' 'PKG_CONFIG_PATH='
2021-05-18 11:22:51.868 [32755:14865912] [Debug] libvlc:Creating an input for 'Detailed pipe 1.avi'
Thread started:  #46
2021-05-18 11:22:51.896 [32755:14866023] [Debug] libvlc:using sout chain=`transcode{venc={module=avcodec{codec=h264_videotoolbox}, vcodec=h264,venc=x264{profile = baseline}},vb=500,venc={module=vpx{quality-mode=2},vcodec=VP80},samplerate=44100,soverlay}:file{dst=/var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed pipe 1_compressed.mp4,mux=ts}'
Thread started: <Thread Pool> #10
Thread started: <Thread Pool> #47
Thread started: <Thread Pool> #11
Thread started: <Thread Pool> #13
Thread started: <Thread Pool> #14
2021-05-18 11:22:52.015 [32755:14865912] [Debug] libvlc:stream=`file'[Debug] libvlc:looking for sout access module matching "file": 7 candidates
2021-05-18 11:22:52.015 [32755:14865850] [Debug] libvlc:set config option: sout-standard-dst to /var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed pipe 1_compressed.mp4
2021-05-18 11:22:52.015 [32755:14866142] [Debug] libvlc:looking for sout mux module matching "ts": 11 candidates
2021-05-18 11:22:52.016 [32755:14865846] [Debug] libvlc:set config option: sout-standard-mux to ts
2021-05-18 11:22:52.016 [32755:14866015] [Debug] libvlc:shaping=200000 pcr=70000 dts_delay=400000
2021-05-18 11:22:52.016 [32755:14866015] [Debug] libvlc:muxer support adding stream at any time
2021-05-18 11:22:52.016 [32755:14866015] [Debug] libvlc:using sout stream module "stream_out_standard"
2021-05-18 11:22:52.016 [32755:14866015] [Warning] libvlc:option venc is unknown
2021-05-18 11:22:52.016 [32755:14866015] [Debug] libvlc:set config option: sout-transcode-samplerate to 44100
2021-05-18 11:22:52.016 [32755:14866015] [Debug] libvlc:set config option: sout-transcode-soverlay to (null)
2021-05-18 11:22:52.017 [32755:14865973] 
2021-05-18 11:22:52.017 [32755:14865846] [Debug] libvlc:using sout mux module "mux_ts"
2021-05-18 11:22:52.017 [32755:14866141] [Debug] libvlc:file access output opened (/var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed pipe 1_compressed.mp4)
2021-05-18 11:22:52.017 [32755:14865912] [Debug] libvlc:using sout access module "file"
2021-05-18 11:22:52.017 [32755:14865911] [Debug] libvlc:looking for sout stream module matching "file": 20 candidates
Thread started: <Thread Pool> #48
Thread started: <Thread Pool> #49
Thread started: <Thread Pool> #17
Thread started: <Thread Pool> #18
Thread started: <Thread Pool> #19
2021-05-18 11:22:52.148 [32755:14866023] [Debug] libvlc:muxer prefers to wait for all ES before starting to mux
2021-05-18 11:22:52.148 [32755:14865846] [Debug] libvlc:using default timeshift path
2021-05-18 11:22:52.148 [32755:14865850] [Debug] libvlc:looking for sout stream module matching "transcode": 20 candidates
2021-05-18 11:22:52.148 [32755:14865973] [Debug] libvlc:using timeshift granularity of 50 MiB
2021-05-18 11:22:52.148 [32755:14865973] [Debug] libvlc:`file:///var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed%20pipe%201.avi' gives access `file' demux `any' path `/var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed%20pipe%201.avi'
2021-05-18 11:22:52.148 [32755:14866145] [Debug] libvlc:creating demux: access='file' demux='any' location='/var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed%20pipe%201.avi' file='/var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed pipe 1.avi'
2021-05-18 11:22:52.149 [32755:14866145] [Debug] libvlc:creating access: file:///var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed%20pipe%201.avi
2021-05-18 11:22:52.149 [32755:14866144] [Debug] libvlc:looking for access module matching "file": 20 candidates
2021-05-18 11:22:52.149 [32755:14866139] [Debug] libvlc:using `file/ts:///var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed pipe 1_compressed.mp4'
2021-05-18 11:22:52.149 [32755:14866142] [Warning] libvlc:option venc is unknown
2021-05-18 11:22:52.149 [32755:14865846] [Debug] libvlc:set config option: sout-transcode-vb to 500[Debug] libvlc:pre-buffering done 1024 bytes in 0s - 7042 KiB/s
2021-05-18 11:22:52.149 [32755:14866015] [Debug] libvlc:using sout stream module "stream_out_transcode"[Debug] libvlc:looking for access_demux module matching "file": 4 candidates
2021-05-18 11:22:52.149 [32755:14865912] [Debug] libvlc:looking for stream_directory module matching "any": 1 candidates
2021-05-18 11:22:52.149 [32755:14866148] [Debug] libvlc:looking for stream_filter module matching "record": 25 candidates[Debug] libvlc:Using stream method for AStream*
2021-05-18 11:22:52.149 [32755:14865912] [Debug] libvlc:using stream_filter module "record"
2021-05-18 11:22:52.150 [32755:14865973] 
2021-05-18 11:22:52.150 [32755:14866143] 
2021-05-18 11:22:52.150 [32755:14866143] [Debug] libvlc:<list 'hdrl'>
2021-05-18 11:22:52.150 [32755:14866144] [Debug] libvlc:looking for stream_filter module matching "prefetch,cache_read": 25 candidates
2021-05-18 11:22:52.150 [32755:14865850] [Debug] libvlc:no stream_directory modules matched
2021-05-18 11:22:52.150 [32755:14866140] [Debug] libvlc:stream=`transcode'
2021-05-18 11:22:52.151 [32755:14866140] [Debug] libvlc:<list 'INFO'>
2021-05-18 11:22:52.151 [32755:14866140] [Debug] libvlc:</list 'INFO'>0
2021-05-18 11:22:52.151 [32755:14866140] [Debug] libvlc:skipping movi chunk
2021-05-18 11:22:52.151 [32755:14865912] [Debug] libvlc:looking for demux module matching "avi": 46 candidates
2021-05-18 11:22:52.151 [32755:14865912] [Debug] libvlc:</list 'AVI '>0
2021-05-18 11:22:52.152 [32755:14865973] [Debug] libvlc:<list 'AVI '>
2021-05-18 11:22:52.152 [32755:14865973] [Debug] libvlc:no more data at 70813996
2021-05-18 11:22:52.152 [32755:14865912] [Debug] libvlc:* LIST-root size:70813996 pos:0
2021-05-18 11:22:52.152 [32755:14865846] 
2021-05-18 11:22:52.152 [32755:14866140] [Debug] libvlc:    |   |   + avih size:56 pos:24[Debug] libvlc:    |   |   + LIST-strl size:116 pos:88
2021-05-18 11:22:52.152 [32755:14865846] 
2021-05-18 11:22:52.152 [32755:14866146] [Debug] libvlc:no access_demux modules matched
2021-05-18 11:22:52.152 [32755:14865911] [Debug] libvlc:using access module "filesystem"
2021-05-18 11:22:52.152 [32755:14866141] [Debug] libvlc:no stream_filter modules matched
2021-05-18 11:22:52.153 [32755:14866144] [Debug] libvlc:</list 'strl'>0
2021-05-18 11:22:52.153 [32755:14865850] [Debug] libvlc:</list 'hdrl'>0
2021-05-18 11:22:52.153 [32755:14865912] [Debug] libvlc:    |   + LIST-hdrl size:192 pos:12
2021-05-18 11:22:52.153 [32755:14865912] [Debug] libvlc:AVIH: 1 stream, flags  HAS_INDEX IS_INTERLEAVED 
2021-05-18 11:22:52.153 [32755:14865912] [Debug] libvlc:stream[0] rate:25000000 scale:1000000 samplesize:0
2021-05-18 11:22:52.153 [32755:14865912] [Debug] libvlc:stream[0] video(H264) 704x576 24bpp 25.000000fps
2021-05-18 11:22:52.153 [32755:14865912] [Debug] libvlc:selecting program id=0
2021-05-18 11:22:52.154 [32755:14865912] [Debug] libvlc:selected standard index for stream[0]
2021-05-18 11:22:52.154 [32755:14865973] [Debug] libvlc:    + RIFF-AVI  size:70813988 pos:0
2021-05-18 11:22:52.154 [32755:14865973] [Debug] libvlc:stream[0] length:396 (based on index)
2021-05-18 11:22:52.154 [32755:14865973] [Debug] libvlc:using demux module "avi"
2021-05-18 11:22:52.154 [32755:14866145] [Debug] libvlc:starting pre-buffering
2021-05-18 11:22:52.154 [32755:14866148] [Debug] libvlc:creating demux: access='file' demux='any' location='/var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed%20pipe%201.avi' file='/var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed pipe 1.avi'
2021-05-18 11:22:52.154 [32755:14865846] [Debug] libvlc:    |   |   |   + strf size:40 pos:164
2021-05-18 11:22:52.155 [32755:14866147] [Debug] libvlc: (path: /var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed pipe 1.avi)
2021-05-18 11:22:52.155 [32755:14865911] [Debug] libvlc:    |   |   + ISFT size:16 pos:224
2021-05-18 11:22:52.155 [32755:14866141] [Debug] libvlc:    |   + JUNK size:1780 pos:248
2021-05-18 11:22:52.155 [32755:14866144] [Debug] libvlc:    |   + LIST-movi size:70603880 pos:2036
2021-05-18 11:22:52.155 [32755:14865850] [Debug] libvlc:    |   + idx1 size:208064 pos:70605924
2021-05-18 11:22:52.155 [32755:14866139] [Debug] libvlc:received first data after 0 ms
2021-05-18 11:22:52.155 [32755:14866146] [Debug] libvlc:    |   + LIST-INFO size:28 pos:212
2021-05-18 11:22:52.155 [32755:14865912] [Debug] libvlc:stream[0] created 9910 index entries
2021-05-18 11:22:52.155 [32755:14866142] [Debug] libvlc:using stream_filter module "cache_read"
2021-05-18 11:22:52.155 [32755:14866140] [Debug] libvlc:    |   |   |   + strh size:56 pos:100
2021-05-18 11:22:52.156 [32755:14866015] [Debug] libvlc:attachment of directory-extractor failed for file:///var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed%20pipe%201.avi
2021-05-18 11:22:52.156 [32755:14866143] [Debug] libvlc:<list 'strl'>
2021-05-18 11:22:52.156 [32755:14866023] [Debug] libvlc:looking for stream_filter module matching "any": 25 candidates
Thread started:  #20
2021-05-18 11:22:52.181 [32755:14865850] [Debug] libvlc:switching to async mode
2021-05-18 11:22:52.181 [32755:14866147] [Debug] libvlc:looking for meta reader module matching "any": 1 candidates
2021-05-18 11:22:52.181 [32755:14866144] [Debug] libvlc:Buffering 0%
2021-05-18 11:22:52.181 [32755:14866146] [Debug] libvlc:Buffering 5%
2021-05-18 11:22:52.181 [32755:14866146] [Debug] libvlc:found NAL_PPS (pps_id=0 sps_id=0)
2021-05-18 11:22:52.181 [32755:14866146] [Debug] libvlc:Buffering 22%
2021-05-18 11:22:52.181 [32755:14866146] [Debug] libvlc:Buffering 25%
2021-05-18 11:22:52.181 [32755:14866145] [Debug] libvlc:looking for packetizer module matching "any": 25 candidates
2021-05-18 11:22:52.182 [32755:14866145] [Debug] libvlc:set config option: sout-transcode-module to avcodec{codec=h264_videotoolbox}
2021-05-18 11:22:52.182 [32755:14866145] [Debug] libvlc:set config option: sout-transcode-vcodec to h264
2021-05-18 11:22:52.182 [32755:14866146] [Debug] libvlc:trying configuration venc={module=avcodec{codec=h264_videotoolbox}, vcodec=h264,venc=x264{profile = baseline}}
2021-05-18 11:22:52.182 [32755:14865850] [Debug] libvlc:Buffering 12%
2021-05-18 11:22:52.182 [32755:14866141] [Debug] libvlc:`file:///var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/Detailed%20pipe%201.avi' successfully opened[Debug] libvlc:Buffering 32%
2021-05-18 11:22:52.182 [32755:14866141] [Debug] libvlc:Buffering 35%
2021-05-18 11:22:52.182 [32755:14866142] [Debug] libvlc:Buffering 10%
2021-05-18 11:22:52.182 [32755:14866142] [Debug] libvlc:Checking video codec mapping for h264 got h264 
2021-05-18 11:22:52.183 [32755:14866023] [Debug] libvlc:adding a new sout input for `h264` (sout_input: 0x282afb380)
2021-05-18 11:22:52.183 [32755:14866023] [Debug] libvlc:Buffering 42%
2021-05-18 11:22:52.183 [32755:14866148] [Debug] libvlc:using packetizer module "h264"[Debug] libvlc:creating video transcoding from fcc=`h264' to fcc=`h264'[Debug] libvlc:Buffering 2%
2021-05-18 11:22:52.183 [32755:14866148] [Debug] libvlc:looking for video decoder module matching "any": 12 candidates
2021-05-18 11:22:52.183 [32755:14866148] [Debug] libvlc:Buffering 45%
2021-05-18 11:22:52.183 [32755:14866140] [Debug] libvlc:Buffering 17%
2021-05-18 11:22:52.183 [32755:14866015] [Debug] libvlc:Buffering 20%
2021-05-18 11:22:52.183 [32755:14866142] [Debug] libvlc:Buffering 40%[Debug] libvlc:Buffering 52%
2021-05-18 11:22:52.183 [32755:14866023] 
2021-05-18 11:22:52.183 [32755:14866139] 
2021-05-18 11:22:52.183 [32755:14866146] [Warning] libvlc:option venc is unknown
2021-05-18 11:22:52.184 [32755:14865850] 
2021-05-18 11:22:52.184 [32755:14865850] [Debug] libvlc:new PPS parsed: 0
2021-05-18 11:22:52.184 [32755:14866144] [Debug] libvlc:found NAL_SPS (sps_id=0)
2021-05-18 11:22:52.184 [32755:14866148] [Debug] libvlc:Buffering 47%
2021-05-18 11:22:52.184 [32755:14866140] [Debug] libvlc:Buffering 50%
2021-05-18 11:22:52.184 [32755:14866015] 
2021-05-18 11:22:52.184 [32755:14866015] [Warning] libvlc:forcing CVPX format: 420v
2021-05-18 11:22:52.184 [32755:14866142] [Debug] libvlc:Buffering 55%
2021-05-18 11:22:52.184 [32755:14866142] [Debug] libvlc:Buffering 75%
2021-05-18 11:22:52.185 [32755:14865911] [Debug] libvlc:no meta reader modules matched
2021-05-18 11:22:52.185 [32755:14865911] [Debug] libvlc:Buffering 80%
2021-05-18 11:22:52.185 [32755:14865911] [Debug] libvlc:Buffering 82%
2021-05-18 11:22:52.185 [32755:14865911] [Debug] libvlc:Buffering 85%
2021-05-18 11:22:52.185 [32755:14865911] [Debug] libvlc:Buffering 87%
2021-05-18 11:22:52.185 [32755:14865911] [Debug] libvlc:Buffering 90%
2021-05-18 11:22:52.185 [32755:14866015] [Debug] libvlc:Buffering 72%[Debug] libvlc:Buffering 92%
2021-05-18 11:22:52.186 [32755:14866142] [Debug] libvlc:Buffering 77%
2021-05-18 11:22:52.186 [32755:14866147] [Debug] libvlc:Buffering 15%
2021-05-18 11:22:52.186 [32755:14865850] [Debug] libvlc:Buffering 62%
2021-05-18 11:22:52.186 [32755:14866144] [Debug] libvlc:Buffering 65%
2021-05-18 11:22:52.186 [32755:14866143] [Debug] libvlc:Buffering 27%
2021-05-18 11:22:52.186 [32755:14866148] [Debug] libvlc:Buffering 67%
2021-05-18 11:22:52.186 [32755:14865973] [Debug] libvlc:looking for a subtitle file in /var/mobile/Containers/Data/Application/2687A4B5-D96C-4CEF-B8DC-B823938C25DC/Documents/
2021-05-18 11:22:52.186 [32755:14866023] [Debug] libvlc:Buffering 57%
2021-05-18 11:22:52.186 [32755:14866015] [Debug] libvlc:Buffering 95%
2021-05-18 11:22:52.186 [32755:14865846] [Debug] libvlc:starting in sync mode
2021-05-18 11:22:52.186 [32755:14866147] [Debug] libvlc:Buffering 100%
2021-05-18 11:22:52.187 [32755:14865850] [Debug] libvlc:Stream buffering done (1025 ms in 28 ms)
2021-05-18 11:22:52.187 [32755:14866140] [Debug] libvlc:Buffering 70%
2021-05-18 11:22:52.187 [32755:14865911] 
2021-05-18 11:22:52.187 [32755:14866139] [Debug] libvlc:Buffering 60%
2021-05-18 11:22:52.187 [32755:14866142] [Debug] libvlc:Buffering 97%
2021-05-18 11:22:52.187 [32755:14866141] [Debug] libvlc:Buffering 37%
2021-05-18 11:22:52.187 [32755:14866146] [Debug] libvlc:new SPS parsed: 0
2021-05-18 11:22:52.187 [32755:14866145] [Debug] libvlc:Buffering 30%
2021-05-18 11:22:52.188 [32755:14865912] [Debug] libvlc:Buffering 7%
2021-05-18 11:22:52.220 [32755:14866143] [Debug] libvlc:using ffmpeg Lavc58.6.103
2021-05-18 11:22:52.220 [32755:14865846] [Warning] libvlc:vt session error: 'kVTVideoDecoderMalfunctionErr'
2021-05-18 11:22:52.221 [32755:14866147] [Error] libvlc:option quiet does not exist
2021-05-18 11:22:52.221 [32755:14865850] [Debug] libvlc:CPU flags: 0x00000068
2021-05-18 11:22:52.221 [32755:14866140] [Debug] libvlc:allowing 6 thread(s) for decoding
2021-05-18 11:22:52.221 [32755:14866146] [Debug] libvlc:using frame thread mode with 6 threads
2021-05-18 11:22:52.221 [32755:14866144] [Debug] libvlc:looking for encoder module matching "avcodec": 15 candidates
2021-05-18 11:22:52.221 [32755:14866144] [Debug] libvlc:CPU flags: 0x00000068
2021-05-18 11:22:52.222 [32755:14866144] [Debug] libvlc:set config option: sout-avcodec-codec to h264_videotoolbox
2021-05-18 11:22:52.222 [32755:14866146] [Debug] libvlc:using ffmpeg Lavc58.6.103
2021-05-18 11:22:52.222 [32755:14865973] [Debug] libvlc:codec (h264) started
2021-05-18 11:22:52.222 [32755:14866145] [Debug] libvlc:using video decoder module "avcodec"
2021-05-18 11:22:52.222 [32755:14866023] [Error] libvlc:option quiet does not exist
2021-05-18 11:22:52.223 [32755:14866141] [Debug] libvlc:Time base for probing set to 1000/25000
2021-05-18 11:22:52.223 [32755:14865846] [Debug] libvlc:Time base set to 1000/25000
2021-05-18 11:22:52.223 [32755:14865846] [Debug] libvlc:rc buffer size 2000000 bits
Thread started:  #21
2021-05-18 11:22:52.319 [32755:14865911] [Error] libvlc:Unknown option "border_mask"
2021-05-18 11:22:52.319 [32755:14866146] [Error] libvlc:Unknown option "qsquish"
2021-05-18 11:22:52.319 [32755:14866142] [Debug] libvlc:found encoder H264 - MPEG-4 AVC (part 10)
2021-05-18 11:22:52.319 [32755:14866148] [Error] libvlc:Unknown option "lmin"
2021-05-18 11:22:52.319 [32755:14866139] [Error] libvlc:Unknown option "lmax"
2021-05-18 11:22:52.319 [32755:14866144] [Error] libvlc:Unknown option "noise_reduction"
2021-05-18 11:22:52.319 [32755:14865973] [Error] libvlc:Unknown option "rc_buffer_aggressivity"
2021-05-18 11:22:52.319 [32755:14866143] [Debug] libvlc:using encoder module "avcodec"
2021-05-18 11:22:52.319 [32755:14866145] [Debug] libvlc:removing module "avcodec"
2021-05-18 11:22:52.325 [32755:14865846] [Notice] libvlc:using venc={module=avcodec{codec=h264_videotoolbox}, vcodec=h264,venc=x264{profile = baseline}} configuration for transcoding
2021-05-18 11:22:52.325 [32755:14866015] [Debug] libvlc:Decoder wait done in 142 ms
Thread started:  #22
2021-05-18 11:22:52.350 [32755:14866140] [Debug] libvlc:available hardware decoder output format 160 (videotoolbox_vld)
2021-05-18 11:22:52.350 [32755:14866140] [Debug] libvlc:available software decoder output format 0 (yuv420p)
2021-05-18 11:22:52.350 [32755:14866140] [Debug] libvlc:Checking if filter chain I420 -> NV12 is possible
2021-05-18 11:22:52.350 [32755:14866147] [Debug] libvlc:looking for video converter module matching "any": 15 candidates
2021-05-18 11:22:52.350 [32755:14866144] [Debug] libvlc:using video converter module "i420_nv12"
2021-05-18 11:22:52.350 [32755:14866144] [Debug] libvlc:Filter 'i420_nv12' (0x109eb9110) appended to chain
2021-05-18 11:22:52.350 [32755:14866144] [Debug] libvlc:removing module "i420_nv12"
2021-05-18 11:22:52.350 [32755:14866144] [Debug] libvlc:Filter 0x109eb9110 removed from chain
2021-05-18 11:22:52.350 [32755:14866144] [Debug] libvlc:Filter chain testing done, input chroma I420 seems to be possible for transcode
2021-05-18 11:22:52.355 [32755:14866015] [Debug] libvlc:source fps 25/1, destination 25/1
2021-05-18 11:22:52.355 [32755:14866015] [Debug] libvlc:source pixel aspect is 0.996540:1
2021-05-18 11:22:52.355 [32755:14866141] [Debug] libvlc:encoder aspect is 704:578
2021-05-18 11:22:52.355 [32755:14866141] [Debug] libvlc:looking for video converter module matching "any": 15 candidates
2021-05-18 11:22:52.355 [32755:14866141] [Debug] libvlc:Filter 'i420_nv12' (0x11f937690) appended to chain
2021-05-18 11:22:52.355 [32755:14866148] [Debug] libvlc:destination (after video filters) 704x578
2021-05-18 11:22:52.355 [32755:14866140] [Debug] libvlc:CPU flags: 0x00000068[Debug] libvlc:scaled pixel aspect is 0.996540:1[Debug] libvlc:set config option: sout-avcodec-codec to h264_videotoolbox
2021-05-18 11:22:52.355 [32755:14866140] [Debug] libvlc:rc buffer size 2000000 bits
2021-05-18 11:22:52.355 [32755:14866146] [Debug] libvlc:using video converter module "i420_nv12"
2021-05-18 11:22:52.355 [32755:14865911] [Error] libvlc:option quiet does not exist[Debug] libvlc:decoder aspect is 1.217993:1
2021-05-18 11:22:52.355 [32755:14866145] 
2021-05-18 11:22:52.355 [32755:14866023] [Debug] libvlc:source 704x576, destination 704x576
2021-05-18 11:22:52.355 [32755:14866139] 
2021-05-18 11:22:52.355 [32755:14866147] 
2021-05-18 11:22:52.355 [32755:14865846] [Debug] libvlc:Time base set to 1/25
2021-05-18 11:22:52.355 [32755:14866015] [Debug] libvlc:source chroma: I420, destination NV12
2021-05-18 11:22:52.355 [32755:14866148] [Debug] libvlc:Time base for probing set to 1/25
2021-05-18 11:22:52.355 [32755:14866141] [Debug] libvlc:using ffmpeg Lavc58.6.103
2021-05-18 11:22:52.355 [32755:14866142] [Debug] libvlc:looking for encoder module matching "avcodec": 15 candidates
2021-05-18 11:22:52.418 [32755:14866143] [Error] libvlc:Unknown option "border_mask"
2021-05-18 11:22:52.418 [32755:14866143] [Debug] libvlc:adding a new input
2021-05-18 11:22:52.418 [32755:14866139] [Debug] libvlc:adding input codec=h264 pid=100
2021-05-18 11:22:52.418 [32755:14866023] [Debug] libvlc:using encoder module "avcodec"
2021-05-18 11:22:52.418 [32755:14865850] [Error] libvlc:Unknown option "lmin"
2021-05-18 11:22:52.418 [32755:14866146] [Error] libvlc:Unknown option "qsquish"
2021-05-18 11:22:52.418 [32755:14866145] [Error] libvlc:Unknown option "rc_buffer_aggressivity"
2021-05-18 11:22:52.418 [32755:14865911] [Debug] libvlc:found encoder H264 - MPEG-4 AVC (part 10)
2021-05-18 11:22:52.418 [32755:14865912] [Error] libvlc:Unknown option "lmax"
2021-05-18 11:22:52.418 [32755:14866147] [Error] libvlc:Unknown option "noise_reduction"[Debug] libvlc:new PCR PID is 100
2021-05-18 11:22:52.418 [32755:14866140] 
2021-05-18 11:22:52.492 [32755:14866142] [Warning] libvlc:almost fed libavcodec with two frames with the same PTS (36713941)
[Removed many lines like the line above to save space in this post]
2021-05-18 11:23:24.157 [32755:14866143] [Warning] libvlc:cannot get packet header, track disabled
2021-05-18 11:23:24.157 [32755:14866142] [Debug] libvlc:EOF reached
2021-05-18 11:23:24.157 [32755:14865850] [Debug] libvlc:waiting decoder fifos to empty
2021-05-18 11:23:24.173 [32755:14866144] [Warning] libvlc:almost fed libavcodec with two frames with the same PTS (36723816)
2021-05-18 11:23:24.263 [32755:14866015] [Debug] libvlc:removing module "h264"[Debug] libvlc:removing a sout input (sout_input: 0x282afb380)
2021-05-18 11:23:24.263 [32755:14865912] 
2021-05-18 11:23:24.263 [32755:14866145] [Debug] libvlc:killing decoder fourcc `h264'
2021-05-18 11:23:24.275 [32755:14866023] [Warning] libvlc:cannot encode one frame
2021-05-18 11:23:24.276 [32755:14866139] [Debug] libvlc:removing module "avcodec"
2021-05-18 11:23:24.277 [32755:14866147] [Debug] libvlc:removing module "avcodec"
2021-05-18 11:23:24.288 [32755:14866142] [Debug] libvlc:Filter 0x11f937690 removed from chain
2021-05-18 11:23:24.289 [32755:14866143] [Debug] libvlc:removing module "i420_nv12"
2021-05-18 11:23:24.289 [32755:14866141] [Debug] libvlc:freeing video PID 100
2021-05-18 11:23:24.289 [32755:14866144] [Warning] libvlc:no more input streams for this mux
2021-05-18 11:23:24.289 [32755:14866148] [Debug] libvlc:removing module "record"
2021-05-18 11:23:24.289 [32755:14866140] [Debug] libvlc:removing module "avi"
2021-05-18 11:23:24.289 [32755:14865850] [Debug] libvlc:removing input pid=100
2021-05-18 11:23:24.289 [32755:14865850] [Debug] libvlc:removing module "filesystem"
2021-05-18 11:23:24.289 [32755:14865846] [Debug] libvlc:removing module "cache_read"
2021-05-18 11:23:24.289 [32755:14865846] [Debug] libvlc:Program doesn't contain anymore ES

Answer 1

You forget to transcode audio to "mp4a". Also change mux to "mp4". This should works. "vb" and "ab" set as you need.

:sout=#transcode{venc=avcodec, vcodec=h264, vb=2048, acodec=m4a, ab=128, samplerate=44100}:std{access=file, mux=mp4, dst=PATH}