libzmq | ZeroMQ core engine in C++ , implements | Pub Sub library

 by   zeromq C++ Version: v4.3.4 License: MPL-2.0

kandi X-RAY | libzmq Summary

kandi X-RAY | libzmq Summary

libzmq is a C++ library typically used in Messaging, Pub Sub applications. libzmq has no bugs, it has no vulnerabilities, it has a Weak Copyleft License and it has medium support. You can download it from GitHub.

ZeroMQ core engine in C++, implements ZMTP/3.1
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            kandi-support Support

              libzmq has a medium active ecosystem.
              It has 8556 star(s) with 2255 fork(s). There are 403 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 264 open issues and 1483 have been closed. On average issues are closed in 185 days. There are 10 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of libzmq is v4.3.4

            kandi-Quality Quality

              libzmq has 0 bugs and 0 code smells.

            kandi-Security Security

              libzmq has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              libzmq code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              libzmq is licensed under the MPL-2.0 License. This license is Weak Copyleft.
              Weak Copyleft licenses have some restrictions, but you can use them in commercial projects.

            kandi-Reuse Reuse

              libzmq releases are available to install and integrate.
              Installation instructions, examples and code snippets are available.
              It has 671 lines of code, 2 functions and 18 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

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            libzmq Key Features

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            libzmq Examples and Code Snippets

            No Code Snippets are available at this moment for libzmq.

            Community Discussions

            QUESTION

            CMake find_package for another library in same project
            Asked 2022-Apr-09 at 00:17

            I want to make a builder project that checks out sub-modules and builds them as a group, and I would like to build them in a single pass.

            ...

            ANSWER

            Answered 2022-Apr-09 at 00:17

            find_package() doesn't actually look at the global targets list, it has its own targets list that only prevents other find calls from refetching

            instead of creating an alias target call find_package_handle_standard_args in a Find<>.cmake module for each class

            so for this case a Findcppzmq.cmake

            Source https://stackoverflow.com/questions/71788085

            QUESTION

            ffmpeg copy codec outputs in slowmotion
            Asked 2022-Apr-08 at 00:16

            i have the following scenario that is driving me crazy:

            i have a capture device. Here the ffprobe on it:

            ...

            ANSWER

            Answered 2022-Apr-08 at 00:16

            *.mjpeg is a raw stream format. FFmpeg documentation states of raw muxers: "They do not store timestamps or metadata." So, instead try storing the data in an mp4 container:

            Source https://stackoverflow.com/questions/71783986

            QUESTION

            ffmpeg - Lower volume of background music for dialog in a video
            Asked 2022-Mar-09 at 16:36

            I have a video with some background music in it.

            I wish to add a piece of spoken dialogue at a particular location in the video, such that the background music is lowered for the entire duration of the dialogue audio.

            I found a similar solution using sidechaincompress, which just works for mp3. I made some changes to it so that it includes the video too (-map 0:v). However, now the audio is cut short as soon as the dialogue ends.

            ...

            ANSWER

            Answered 2022-Mar-09 at 16:36

            Try this (the short clip inserted at 3-second mark):

            Source https://stackoverflow.com/questions/71383922

            QUESTION

            ffmpeg error "output file #0 does not contain any stream" with FORFILES
            Asked 2022-Feb-03 at 22:07

            I'm trying to convert all the songs in a folder from flac to alac. All the files in the folder are flac.

            What I'm writing:

            ...

            ANSWER

            Answered 2022-Feb-03 at 22:07

            The forfiles command is a nasty beast, because there are several caveats:

            • it is slow (particularly because it cannot run internal commands of the hosting command prompt);
            • it handles wildcards differently than most other commands, hence /M *.* does not match all files but only such with an extension; to really match all files, use /M * or skip it since it is the default anyway;
            • it applies backslash-escaping, which is particularly annoying with paths ending in \, like the root directory of a drive /P "D:\", which causes a syntax error since the closing quotation mark is considered as escaped; to work around that, preferably append a . like /P "D:\.", or remove the quotation marks like /P D:\, though this exposes potential whitespaces or special characters to the parser;
            • all of the special @-variables that return the path and/or name of iterated items provide the values in quoted manner, which is particularly frustrating when it comes to concatenation;
            • it iterates over both files and directories that match the given mask; to distinguish between them you could use the special @isdir variable, but you will need an if statement for this (like if @isdir==FALSE or if @isdir==TRUE), which is an internal cmd.exe command, requiring its explicit instantiation even when you would not need it else;
            • handling of the command behind /C and its arguments is terribly implemented, leading to the problem that directly running external commands (so without cmd /C) may fail, unless you are aware of the mostly working fix by stating the command name twice (like /C "command.exe command.exe --parameter argument");
            • even its basically nice /D option (which is the only reason why forfiles might suit better than for) to filter for the relative last modification date (but not time) is badly implemented when a positive number (like /D +1) is used, because this uselessly points to the future;

            All of these issues lead me to the point that I suggest not to use forfiles and to use a standard for loop instead, like this (note also the changed mask *.flac):

            Source https://stackoverflow.com/questions/70781120

            QUESTION

            Where are Python headers included in MacOS Monterey arm64
            Asked 2022-Jan-24 at 09:32

            I am currently struggling to find the python headers on my system and can't include them therefore into a C++ application

            this is my cmake file -->

            ...

            ANSWER

            Answered 2022-Jan-24 at 09:32

            It seems to me that the first problem is with the order of these lines:

            Source https://stackoverflow.com/questions/70831506

            QUESTION

            Inconsistent frame number with ffmpeg
            Asked 2022-Jan-16 at 00:46

            I'm having regularly issue with hvc1 videos getting an inconsistent number of frames between ffprobe info and FFmpeg info, and I would like to know what could be the reason for this issue and how if it's possible to solve it without re-encoding the video.

            I wrote the following sample script with a test video I have

            I split the video into 5-sec segments and I get ffprobe giving the expected video length but FFmpeg gave 3 frames less than expected on every segment but the first one.

            The issue is exactly the same if I split by 10 seconds or any split, I always lose 3 frames.

            I noted that the first segment is always 3 frames smaller (on ffprobe) than the other ones and it's the only consistent one.

            Here is an example script I wrote to test this issue :

            ...

            ANSWER

            Answered 2022-Jan-11 at 22:08

            The source of the differences is that FFprobe counts the discarded packets, and FFmpeg doesn't count the discarded packets as frames.

            Your results are consistent with video stream that is created with 3 B-Frames (3 consecutive B-Frames for every P-Frame or I-Frame).

            According to Wikipedia:

            I‑frames are the least compressible but don't require other video frames to decode.
            P‑frames can use data from previous frames to decompress and are more compressible than I‑frames.
            B‑frames can use both previous and forward frames for data reference to get the highest amount of data compression.

            When splitting a video with P-Frame and B-Frame into segments without re-encoding, the dependency chain breaks.

            • There are (almost) always frames that depends upon frames from the previous segment or the next segment.
            • The above frames are kept, but the matching packets are marked as "discarded" (marked with AV_PKT_FLAG_DISCARD flag).

            For the purpose of working on the same dataset, we my build synthetic video (to be used as input).

            Building synthetic video with the following command:

            Source https://stackoverflow.com/questions/70578206

            QUESTION

            Chrome MediaRecorder is randomly generating corrupted video files
            Asked 2021-Dec-23 at 13:17
            • Chrome: Version 96.0.4664.55 (Official Build) (x86_64)
            • System: Mac Catalina 10.15.5

            I am using this code to generate small stand alone videos from a MediaRecorder:

            ...

            ANSWER

            Answered 2021-Dec-09 at 09:48

            I moved the creation of the MediaRecorder instance to the recurrent function and now it is working properly:

            Source https://stackoverflow.com/questions/70214933

            QUESTION

            ffmpeg - script to extract 1st frame of each second with deinterlacing
            Asked 2021-Dec-22 at 04:45

            i'm trying to write a shell script to analyse some videos by using the first frame of each second of video as a basis. i'm using ffmpeg to extract the frames. i thought i'd hit gold when this thread came up in my searches, but it doesn't handle the deinterlacing.

            i'm using a time-based approach that works well for various formats as long as the video is progressive. it doesn't work so well for interlaced video (only the first field is output in that case, creating a half-height image). i've tried various combinations of deinterlacing (yadif/bwdif) with select but the filter chains i create either cause errors or still return a half-sized image.

            here is my call w/a filter that works correctly for progressive video source :
            ffmpeg -i $infile -vf "select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))" -vsync 0 $outfile

            the following still return only half-height images for interlaced source :
            ... -vf "bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"

            ... -vf "bwdif=0,select='between(mod(n\,$ips)\,1\,2)'" -- $ips is images per second

            ... -vf "select='between(mod(n\,$ips)\,1\,2)',bwdif=0"

            i've also tried various permutations of the above w/explicit frame reference (-r, -vframes, ...), still no joy.

            can someone help me with the syntax ?

            --EDIT--
            here is the complete output of running the command with the first filter :

            ...

            ANSWER

            Answered 2021-Dec-22 at 04:45

            Your input is detected as interlaced but with half-height (288) and double the framerate (50). This may be due to missing or unrecognized boundary markers in the JPEG2000 packets. I assume this is meant to be PAL --> 720x576@25i.

            Try using the tinterlace filter first to interleave the input "frames" to double-height and half fps, and then continue the original sequence of filters.

            "tinterlace=mode=merge,bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"

            Source https://stackoverflow.com/questions/70380430

            QUESTION

            Apache mpm event shared memory error - ffmpeg-python Error while opening encoder for output stream #0:1 when accessed by multiple instances
            Asked 2021-Dec-09 at 12:42
            EDIT:

            I kinda figured out, the problem needs to deal with apache mpm event... When I send my request on the first client, my script is getting executed linear. When I send my request from the second client, he is literally starting at that point in the code where the last request currently is. So that might be a problem with shared memory between those threads, but I'm not an apache professional, maybe somebody has an idea?
            I used apache mpm prefork before, so every request is getting his own process and own memory etc., but there was a problem reading jpg files with that one and it worked after I changed apache to mpm event, see the following: https://github.com/python-pillow/Pillow/issues/5834#issue-comment-box

            Inside my VM (running same apache version with mpm event) everything is working fine.

            I've got a python script with flask running via wsgi on an apache2 webserver. Inside of that script I got following lines (458-461):

            ...

            ANSWER

            Answered 2021-Dec-04 at 15:39

            Okay, for the love of God Im done... needed 4 days for that **** to find out, I had an apache mod activated (fcgid) which literally assign every single line of ur code to a single thread... so I deactivated that one and now its working without any issues...

            So in short - what I did:

            Source https://stackoverflow.com/questions/70221356

            QUESTION

            ffmpeg stops encoding after two frames
            Asked 2021-Dec-09 at 04:08

            I have a HEVC encoded 4k Video captured from a Reolink IP-Cam with VLC Player 3.0.14. I want to extract each frame of the video but the encoding stops after only two frames. This also happens when I try to convert into another video format. This happens on Windows and Ubuntu with different ffmpeg versions.

            My command is:

            ...

            ANSWER

            Answered 2021-Dec-09 at 04:08

            MP4s may have an edit list which tell the player to construct a virtual playback timeline. Occasionally, this timeline can leave out frames needed to decode stream correctly, or the sync samples table may be wrong.

            Add -ignore_editlist to demux the stream without any edits.

            ffmpeg.exe -ignore_editlist 1 -i vlc-record-2021-06-07-08h01m03s-rtsp___192.168.178.92_554_h265Preview_01_main-.mp4 output/%05d.jpg

            Source https://stackoverflow.com/questions/70272945

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install libzmq

            To build from sources, see the INSTALL file included with the distribution.

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            Libzmq is mainly written in C++98 with some optional C++11-fragments. For configuration either autotools or CMake is employed. See below for some lists of platforms, where libzmq has been successfully compiled on.
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