Sur d’autres sites (7246)

• Is there a way to integrate FFmpeg into own C#-Solution using Visual Studio ?

  17 avril 2023, par stupidbutseeking

  I can't figure out how to use FFmpeg in my own C#-Project.
I downloaded the win64 gpl shared release with the libs from https://github.com/BtbN/FFmpeg-Builds/releases but I can't find a way to integrate it into my existing Visual Studio Solution.

  


  I also tried to compile the libs following this guide : https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT for win x64
and also this https://github.com/microsoft/FFmpegInterop
but none worked.

  


  When I reference the dlls (using the Dependency-Manager from VS) it will complain that the references are invalid or not supported.

  


  I also created a new VS Project but the same problem occured. I read in some forum that the target framework has to be netstandard2.0.

  


  I think I missed something but I cant find out what it is.

  


• Recording with python librtmp RTMP shrinks. Please help because i´m asking for solution for 2 months and i cant solve this

  21 décembre 2022, par Yojuan

  The code for capturing a video stream using python librtmp is this :

  


  import librtmp

conn = librtmp.RTMP('rtmp://some_program', live=True)
conn.connect()
stream = conn.create_stream(update_buffer=True)
        
f = open("my_program.flv", 'wb')
while True:
    try:
        data=stream.read(1024)
        if data:
            f.write(data)
            f.flush()
    except:
        print("Error during stream")


  


  The duration of the program is of 1 hour, but when i play the video, the duration becomes in 59 min and 52 secs or 59 min and 56 secs.... but in the most cases the duration is 1 hour exactly.

  


  I noticed that the first record always is perfect but in some cases the second shrinks. (when i use the function for second time or more)

  


  First i thought the problem was on ffmpeg because i use it to encode the video but it isnt because the video without encoding (the raw capture) shrinks anyway and i have other program that capture the same video with duration of 1 hour every time.

  


  I want to know if somebody knows what happends. I suppose that there is a buffer that is not being emptied correctly or something like that. Please help !

  


• ffmpeg video duration is not equal to duration after hls process

  9 décembre 2022, par Timur Khazhiev

  Problem

  


  For videofile input I preprocess/encode it to libx264. Then I'm trying to cut video into 2 second chunks except last one (last one being < 2 seconds) using hls processing

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  ffmpeg -v error -i video.mp4 -x264-params "keyint=60:min-keyint=60:scenecut=0" 
-hls_time 2 -hls_list_size 0 -hls_segment_filename chunk%03d.ts index.m3u8


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  which follows this problem

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  then looking into index.m3u8 file reveals that sum of all chunks' durations does not add up to original video duration :

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  % ffprobe -loglevel quiet -print_format flat -show_entries format=duration index.m3u8     

format.duration="204.880000"

% ffprobe -loglevel quiet -print_format flat -show_entries format=duration video.mp4 

format.duration="204.892813"


  &#xA;

  Moreover duration of a chunk in index.m3u8 is not the same as in chunk file.

  &#xA;

  % ffprobe -loglevel quiet -print_format flat -show_entries format=duration chunk000.ts

format.duration="2.023222"

% cat index.m3u8
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:2.000000,
chunk000.ts
#EXTINF:2.000000,
chunk001.ts
#EXTINF:2.000000,
chunk002.ts
...


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  Misc

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  Used these videos : Me at the zoo and I finally found a useful monorail.

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  OS : macos Monterey 12.3.1 (21E258)

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  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
built with Apple clang version 14.0.0 (clang-1400.0.29.102)
configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --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
libavutil      57. 28.100 / 57. 28.100
libavcodec     59. 37.100 / 59. 37.100
libavformat    59. 27.100 / 59. 27.100
libavdevice    59.  7.100 / 59.  7.100
libavfilter     8. 44.100 /  8. 44.100
libswscale      6.  7.100 /  6.  7.100
libswresample   4.  7.100 /  4.  7.100
libpostproc    56.  6.100 / 56.  6.100


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  What I tried

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  • Preprocess/transcode video before proceeding with hls

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  • Force keyframes before proceeding with hls

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  • Use 1, 3, 4 seconds chunks

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  • Use different GOP sizes

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  • -hls_flags split_by_time

  &#xA;

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  but it leads to same result or very unequal chunks

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  Questions

  &#xA;

  &#xA;
  1. Is it ok or I'm missing something ?

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  2. If not, what parameters/options should I use to force chunks to be precisely 2 seconds ?

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