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• FFmpeg av_dump_format showing incorrect output, but ffprobe displays correct metadata

  29 janvier, par グルグル

  I use ffmpeg 7.1 source build on windows and compilation configuration as follow :

  


  configuration:
  --toolchain=msvc
  --arch=x86_64
  --enable-x86asm
  --enable-asm
  --enable-shared
  --enable-w32threads
  --prefix=/D/build


  


  When I use av_dump_format to print metadata of test.mp3, it display the incorrect information.

  


  extern "C"&#xA;{&#xA;#include <libavformat></libavformat>avformat.h>&#xA;}&#xA;&#xA;int main()&#xA;{ &#xA;    av_log_set_level(AV_LOG_DEBUG);&#xA;&#xA;    auto url = "D:/music/test.mp3";&#xA;&#xA;    AVFormatContext* fmt;&#xA;    auto ret = avformat_open_input(&amp;fmt, url, nullptr, nullptr);&#xA;    if (ret &lt; 0)&#xA;    {&#xA;        av_log(nullptr, AV_LOG_ERROR, "Cannot open %s format : %s", url, av_err2str(ret));&#xA;        exit(EXIT_FAILURE);&#xA;    }&#xA;&#xA;    av_dump_format(fmt, 0, url, 0);&#xA;}&#xA;

  


  output

  


  [AVFormatContext @ 000001768E65BC40] Opening 'D:/music/test.mp3' for reading
[file @ 000001768E65C180] Setting default whitelist 'file,crypto,data'
[mp3 @ 000001768E65BC40] Format mp3 probed with size=4096 and score=51
id3v2 ver:4 flags:00 len:35
[mp3 @ 000001768E65BC40] pad 576 576
[mp3 @ 000001768E65BC40] Skipping 0 bytes of junk at 462.
Input #0, mp3, from 'D:/music/test.mp3':
  Metadata:
    encoder         : Lavf58.76.100
  Duration: N/A, bitrate: N/A
  Stream #0:0, 0, 1/14112000: Audio: mp3, 0 channels
      Metadata:
        encoder         : Lavc58.13


  


  You can see the Stream info is useless.

  


  But I use ffprobe which is built with same configuration to print metadata of test.mp3.

  


  It's display normal.

  


  ffprobe version 7.0.1 Copyright (c) 2007-2024 the FFmpeg developers
  built with Microsoft (R) C/C++ Optimizing Compiler Version 19.41.34123 for x64
  configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --prefix=/D/build
  WARNING: library configuration mismatch
  avutil      configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
  avcodec     configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
  avformat    configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
  avdevice    configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
  avfilter    configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
  swscale     configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
  swresample  configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
  libavutil      59.  8.100 / 59. 39.100
  libavcodec     61.  3.100 / 61. 19.100
  libavformat    61.  1.100 / 61.  7.100
  libavdevice    61.  1.100 / 61.  3.100
  libavfilter    10.  1.100 / 10.  4.100
  libswscale      8.  1.100 /  8.  3.100
  libswresample   5.  1.100 /  5.  3.100
Input #0, mp3, from 'D:\music\test.mp3':
  Metadata:
    encoder         : Lavf58.76.100
  Duration: 00:05:00.12, start: 0.025057, bitrate: 128 kb/s
  Stream #0:0: Audio: mp3 (mp3float), 44100 Hz, stereo, fltp, 128 kb/s
      Metadata:
        encoder         : Lavc58.13


  


  Why is av_dump_format not correctly showing stream information ? How can I fix it ?

  


• RTMP Disconnects quickly when the stream is turned on and No index.m3u8 files are being generated in the assigned directory [closed]

  23 avril, par Kartik Salve

  23/4/2025 09:52:58 9408 [INFO] [rtmp connect] id=7K1RWSO1 ip=::1 app=live args={"app":"live","flashVer":"LNX 9,0,124,2","tcUrl":"rtmp://localhost:1935/live","fpad":false,"capabilities":15,"audioCodecs":4071,"videoCodecs":252,"videoFunction":1}
23/4/2025 09:52:58 9408 [INFO] [rtmp play] Join stream. id=7K1RWSO1 streamPath=/live/test  streamId=1 
23/4/2025 09:52:59 9408 [INFO] [rtmp play] Close stream. id=7K1RWSO1 streamPath=/live/test streamId=1
23/4/2025 09:52:59 9408 [INFO] [rtmp disconnect] id=7K1RWSO1


  


  These are the logs, ffmpeg pushes the stream in a different folder when tried manually.

  


  

  • I tried changing the location of my file outside of oneDrive to avoid any permission conflicts.

  


  • Manually checked if FFmpeg is correct with this command : C:\ffmpeg\bin\ffmpeg.exe -i rtmp://localhost/live/test -c:v copy -c:a aac -f hls -hls_time 2 -hls_list_size 5 -hls_flags delete_segments output/index.m3u8

  


  • Downgraded NMS to a stable version.

  


  


• Use nvidia hardware acceleration to merge webms with pngs in ffmpeg

  2 février, par Joshi234

  So I need to merge around 18000 webms with with pngs, however on software encoding it's really slow, so I'm trying to use hardware acceleration to make this faster.

  


  I tried a lot of different stuff but none of them seems to work and it gives me generic errors to what I couldn't find anything relavant.

  


  This is the most "succesful" try I had :
ffmpeg -hwaccel cuvid -c:v vp9_cuvid  -i lightray.webm -i card.png -filter_complex "[1]format=argb,colorchannelmixer=aa=0.35[ol];[0][ol]overlay" -colorspace 5 -c:a copy output.webm

  


  Which gives me this error :

  


  ffmpeg version n7.0.1-ffmpeg-windows-build-helpers Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 10.2.0 (GCC)
  configuration: --pkg-config=pkg-config --pkg-config-flags=--static --extra-version=ffmpeg-windows-build-helpers --enable-version3 --disable-debug --disable-w32threads --arch=x86_64 --target-os=mingw32 --cross-prefix=/home/runner/work/ffmpeg-stable-autobuild/ffmpeg-stable-autobuild/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32- --enable-libcaca --enable-gray --enable-libtesseract --enable-fontconfig --enable-gmp --enable-libass --enable-libbluray --enable-libbs2b --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libvorbis --enable-libwebp --enable-libzimg --enable-libzvbi --enable-libmysofa --enable-libopenjpeg --enable-libopenh264 --enable-libvmaf --enable-libsrt --enable-libxml2 --enable-opengl --enable-libdav1d --enable-gnutls --enable-libsvtav1 --enable-libvpx --enable-libaom --enable-nvenc --enable-nvdec --extra-libs=-lz --extra-libs=-lpng --extra-libs=-lm --extra-libs=-lfreetype --extra-libs=-lshlwapi --extra-libs=-lmpg123 --extra-libs=-lpthread --extra-cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCACA_STATIC --enable-amf --enable-libmfx --enable-libaribcaption --enable-gpl --enable-frei0r --enable-librubberband --enable-libvidstab --enable-libx264 --enable-libx265 --enable-avisynth --enable-libaribb24 --enable-libxvid --enable-libdavs2 --enable-libxavs2 --enable-libxavs --extra-cflags='-mtune=generic' --extra-cflags=-O3 --enable-static --disable-shared --prefix=/home/runner/work/ffmpeg-stable-autobuild/ffmpeg-stable-autobuild/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32 --enable-nonfree --enable-libfdk-aac --enable-decklink
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 3 times
[vp9 @ 000001baa2891400] Not all references are available
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 1 times
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 4 times
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 3 times
[vp9 @ 000001baa2891400] Not all references are available
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 12 times
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 4 times
[vp9 @ 000001baa2891400] Not all references are available
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 1 times
[vp9 @ 000001baa2891400] Not all references are available
    Last message repeated 1 times
[vp9 @ 000001baa2891400] Invalid frame marker
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 1 times
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
    Last message repeated 1 times
[vp9 @ 000001baa2891400] Not all references are available


  


  I'm by no means an expert in ffmpeg or in video encoding in general, so I have no idea what this is supposed to mean.