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  • FFMPEG not "cutting" as expected

    10 février 2021, par mornindew

    I am using FFMPEG (from a java application) via a simple system.process and trying to cut a video into chunks. I am attempting to cut it into 10 second increments. My FFMPEG commands look like :

    



    ffmpeg -i SampleVideo.mp4 -ss 00:00:00.00 -t 00:00:10.00 -strict -2 1438458522836/1438458522836_0.mp4
ffmpeg -i SampleVideo.mp4 -ss 00:00:10.01 -t 00:00:20.00 -strict -2 1438458522836/1438458536306_1.mp4
ffmpeg -i SampleVideo.mp4 -ss 00:00:20.01 -t 00:00:30.00 -strict -2 1438458522836/1438458546042_2.mp4
ffmpeg -i SampleVideo.mp4 -ss 00:00:30.01 -t 00:00:40.00 -strict -2 1438458522836/1438458561165_3.mp4
ffmpeg -i SampleVideo.mp4 -ss 00:00:40.01 -t 00:00:50.00 -strict -2 1438458522836/1438458577187_4.mp4
ffmpeg -i SampleVideo.mp4 -ss 00:00:50.01 -t 00:01:00.00 -strict -2 1438458522836/1438458587935_5.mp4


    



    They look correct to me but my videos are not coming out in 10 second increments. They seem to be getting "split" in random spots. Any ideas on what I am doing wrong ?

    



    For reference :

    



    video 0 == 10 seconds
video 1 == 20 seconds
Video 2 == 30 seconds
Video 3 == 32 seconds
Video 4 == 22 seconds
Video 5 == 12 seconds


    



    Any help would be appreciated.

    


  • Controlling "Real-Time" sending rate in RTP Streaming with FFMpeg

    14 décembre 2020, par Robert_Ordis

    I'm trying to build an experimental audio telephony system with ffmpeg to talk some G.711 VoIP machine.

    


    Then, I tried this command.

    


    .\ffmpeg.exe -re -f dshow -i audio="CABLE Output (VB-Audio Virtual Cable)" -ac 1 -ab 64k -ar 8000 -f mulaw -f rtp "rtp://192.168.3.175:4449?fifo_size=240&localrtpport=5100&pkt_size=240"


    


    In WireShark capturing, the audio in each packets was actually divided in each around 30[ms].

    


    However, 17- 18 packets was sent together once per 500[ms].

    


    Sent audio was correct, but in this situation, an opponent machine can't treat this correctly.

    


    How do I send these packets in per "UNDER 0.5 SEC" ?

    


  • The C compiler "clang.exe" is not able to compile a simple test program

    8 octobre 2020, par M. Bilal Asif

    I am trying to compile shell script that compiles the C project library, but i am stuck at this when it comes to compile the nmake part.

    


    I am using NDK 21 and cmake version is 3.10

    


    I am using shell script using bash same as defined here, i want to compress this library as they showing in the docs running ./android.sh

    


    Please check the link : https://github.com/tanersener/mobile-ffmpeg#52-build-scripts

    


    here is the attached log :

    


    DEBUG: Downloading library source: cpu-features

DEBUG: Checking if cpu-features is already downloaded at /d/Bilals/Projects/GithubProjects/mobile-ffmpeg/src/cpu-features

INFO: cpu-features library already downloaded

INFO: cpu-features already downloaded. Source folder found at /d/Bilals/Projects/GithubProjects/mobile-ffmpeg/src/cpu-features

-- Building for: NMake Makefiles
-- Check for working C compiler: D:/Bilals/PcBackupData/sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe
CMake Error: Generator: execution of make failed. Make command was: "nmake" "/NOLOGO" "cmTC_adf3f\fast"
-- Check for working C compiler: D:/Bilals/PcBackupData/sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe -- broken
CMake Error at D:/Bilals/PcBackupData/sdk/cmake/3.10.2.4988404/share/cmake-3.10/Modules/CMakeTestCCompiler.cmake:52 (message):
  The C compiler

    "D:/Bilals/PcBackupData/sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: D:/Bilals/Projects/GithubProjects/mobile-ffmpeg/android/build/cpu-features/arm/CMakeFiles/CMakeTmp
    
    Run Build Command:"nmake" "/NOLOGO" "cmTC_adf3f\fast"
    The system cannot find the file specified
    Generator: execution of make failed. Make command was: "nmake" "/NOLOGO" "cmTC_adf3f\fast"
    

  

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:9 (project)


-- Configuring incomplete, errors occurred!
See also "D:/Bilals/Projects/GithubProjects/mobile-ffmpeg/android/build/cpu-features/arm/CMakeFiles/CMakeOutput.log".
See also "D:/Bilals/Projects/GithubProjects/mobile-ffmpeg/android/build/cpu-features/arm/CMakeFiles/CMakeError.log".


    


    and here is my environmental variables

    


    enter image description here

    


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