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OpenCV on MacOS : Match Camera Index and Name
15 janvier, par rpi_guruI have a builtin camera and a USB webcam connected to my MacOS.


Here is a result of
system_profiler SPCameraDataType -xmlcommand :

<?xml version="1.0" encoding="UTF-8"?>

<plist version="1.0">
<array>
 <dict>
 <key>_SPCommandLineArguments</key>
 <array>
 <string>/usr/sbin/system_profiler</string>
 <string>-nospawn</string>
 <string>-xml</string>
 <string>SPCameraDataType</string>
 <string>-detailLevel</string>
 <string>full</string>
 </array>
 <key>_SPCompletionInterval</key>
 <real>1.1997909545898438</real>
 <key>_SPResponseTime</key>
 <real>1.2810090780258179</real>
 <key>_dataType</key>
 <string>SPCameraDataType</string>
 <key>_detailLevel</key>
 <integer>-1</integer>
 <key>_items</key>
 <array>
 <dict>
 <key>_name</key>
 <string>USB Camera</string>
 <key>spcamera_model-id</key>
 <string>UVC Camera VendorID_3141 ProductID_25453</string>
 <key>spcamera_unique-id</key>
 <string>0x11000000c45636d</string>
 </dict>
 <dict>
 <key>_name</key>
 <string>FaceTime HD Camera</string>
 <key>spcamera_model-id</key>
 <string>FaceTime HD Camera</string>
 <key>spcamera_unique-id</key>
 <string>EAB7A68F-EC2B-4487-AADF-D8A91C1CB782</string>
 </dict>
 </array>
 <key>_parentDataType</key>
 <string>SPHardwareDataType</string>
 <key>_properties</key>
 <dict>
 <key>_name</key>
 <dict>
 <key>_isColumn</key>
 <string>NO</string>
 <key>_isOutlineColumn</key>
 <string>NO</string>
 <key>_order</key>
 <string>0</string>
 </dict>
 <key>spcamera</key>
 <dict>
 <key>_order</key>
 <string>10</string>
 </dict>
 <key>spcamera_model-id</key>
 <dict>
 <key>_order</key>
 <string>30</string>
 </dict>
 <key>spcamera_unique-id</key>
 <dict>
 <key>_order</key>
 <string>40</string>
 </dict>
 <key>volumes</key>
 <dict>
 <key>_detailLevel</key>
 <string>0</string>
 </dict>
 </dict>
 <key>_timeStamp</key>
 <date>2024-11-29T21:57:28Z</date>
 <key>_versionInfo</key>
 <dict>
 <key>com.apple.SystemProfiler.SPCameraReporter</key>
 <string>1.2.0</string>
 </dict>
 </dict>
</array>
</plist>


As you can see, I have a couple of video input devices :
USB Camera&FaceTime HD Camera

The problem is that when I use
cap = cv2.VideoCapture(0), it uses theFaceTime HD Camera.

Can we match the camera index in OpenCV with the camera names ?


P.S. I tried
ffmpeg, but it returned similar result :



ioreg | grep -i camresult :



-
ffmpeg video to rtsp not working, ffmpeg is not reading the video frame by frame [closed]
15 janvier, par Leroy JeslynHere's the ffmpeg command :


gst-launch-1.0 videotestsrc ! decodebin ! videoconvert ! videoscale \
 ! video/x-raw,width=1280,height=720 ! x264enc speed-preset=ultrafast \
 tune=zerolatency ! rtph264pay ! udpsink host=127.0.0.1 port=5000 sync=false \
 ! rtspserver service=0/test


The output was :


ffmpeg version 7.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers 
 built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-
libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth 
--enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libqui
rc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 
--enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable
-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-
cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-lib
shaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enab
le-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --e
nable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 libavutil 59. 39.100 / 59. 39.100
 libavcodec 61. 19.100 / 61. 19.100
 libavformat 61. 7.100 / 61. 7.100
 libavdevice 61. 3.100 / 61. 3.100
 libavfilter 10. 4.100 / 10. 4.100
 libswscale 8. 3.100 / 8. 3.100
 libswresample 5. 3.100 / 5. 3.100
 libpostproc 58. 3.100 / 58. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Render/fire3.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: mp41isom
 creation_time : 2025-01-08T13:10:15.000000Z
 Duration: 00:01:21.79, start: 0.000000, bitrate: 12799 kb/s
 Stream #0:0[0x1](und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 12798 kb/s, 14 fps, 14 tbr, 14k tbn (default)
 Metadata:
 creation_time : 2025-01-08T13:10:15.000000Z
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 encoder : AVC Coding
[out#0/rtsp @ 00000178486d9a00] Codec AVOption b:a (set bitrate (in bits/s)) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some decoder which was not actually used for any stream.
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0000017848d200c0] using SAR=1/1
[libx264 @ 0000017848d200c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000017848d200c0] profile High, level 3.1, 4:2:0, 8-bit
[libx264 @ 0000017848d200c0] 264 - core 164 r3192 c24e06c - H.264/MPEG-4 AVC codec - Copyleft 2003-2024 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 d
eblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_q
p_offset=-2 threads=22 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 
direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=14 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=1000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00



This is were the output stopped, instead of reading the video frame by frame, it stops here and runs indefinitely. I tried to use VLC and python script to read the rtsp url, but that didn't work.
I tried the alternative using GStreamer, but i couldn't install rtsp-server on Windows 11.


Thank you for your time, any suggestion or answers are appreciated. The end goal is to convert a video to a rtsp url.


-
FFMPEG convert videos using Automator [closed]
8 janvier, par FilipProI'm trying to use Apple Automator (v2.10, Sonoma 14.7.1, Apple M1) to select a folder and convert all MP4 files to WMV files using FFMPEG. The user is supposed to export files from Final Cut Pro in MP4, put them in a folder of their choice and then start the automation by having to select the folder where MP4 files are saved.


FFMPEG is installed via Homebrew and the installation folder was found via "which ffmpeg" ( /opt/homebrew/bin/ffmpeg ).


This is the worklow I currently have : Full Automator Workflow


- 

-
Run AppleScript


- 

- 

on run {input, parameters}

 tell application "System Events"
 activate
 return text returned of (display dialog "Enter administrator password" default answer "" with hidden answer)
 end tell

 return input
end run






- 

-
Run Shell script (/bin/zsh, no input required)


- 

- 

sudo -S id -u






- 

-
Ask for Finder elements


- 

- Select folder, starting from "Downloads" folder, no multiple selection




-
Run Shell script (/bin/zsh, input as arguments)


- 

- 

cd "$1"

for f in *.mp4; do
 osascript -e "display notification \"Converting file: $f \" with title \"Video Conversion\""
 sudo /opt/homebrew/bin/ffmpeg -i "$f" -c:v wmv2 -b:v 3000k -c:a wmav2 -b:c 192k "${f%.*}.wmv"
 if [ $? -eq 0 ]; then
 osascript -e "display notification \"Converted file: $f \" with title \"Video Conversion\""
 else
 osascript -e "display notification \"Error converting file: $f \" with title \"Video Conversion\""
 fi
done






- 











The actual script (step 4) works perfectly if handtyped in Terminal but FFMPEG return "Error opening output files : Invalid argument" when run within the Automator workflow.


This is the output of step 4 (I added *REDACTED FOR PRIVACY* instead of actual filenames) :


ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers
built with Apple clang version 16.0.0 (clang-1600.0.26.4)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
libavutil 59. 39.100 / 59. 39.100
libavcodec 61. 19.100 / 61. 19.100
libavformat 61. 7.100 / 61. 7.100
libavdevice 61. 3.100 / 61. 3.100
libavfilter 10. 4.100 / 10. 4.100
libswscale 8. 3.100 / 8. 3.100
libswresample 5. 3.100 / 5. 3.100
libpostproc 58. 3.100 / 58. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '*REDACTED FOR PRIVACY*':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: isommp41mp42
creation_time : 2024-12-30T17:06:35.000000Z
Duration: 00:00:15.00, start: 0.000000, bitrate: 5122 kb/s
Stream #0:0[0x1](und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 5119 kb/s, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 24k tbn (default)
Metadata:
creation_time : 2024-12-30T17:06:35.000000Z
handler_name : Core Media Video
vendor_id : [0][0][0][0]
Trailing garbage at the end of a stream specifier: c
Error opening output file *REDACTED FOR PRIVACY*.
Error opening output files: Invalid argument”


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