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• avformat/nuv : return early if header id fails to read

  25 juin 2024, par Kacper Michajłow

  avformat/nuv : return early if header id fails to read
  Fixes use of uninitialized value in memcmp below, reported by MSAN.
  Found by OSS-Fuzz.
  Signed-off-by : Kacper Michajłow <kasper93@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/nuv.c

• Script to bulk merge audio and a video+audio file

  19 février 2021, par Jason Smith

  I have a folder with 52 video+audio files (m3u8 extn)
and 52 audio files (different language)(m4a extn)
The names of the files are same
abcde.m3u8(video)
abcde.m4a(that other language audio only file)

  


  i want to merge them so i have a single file Video+auido1+audio2
and i don't to lose any quality in the merging process

  


  What would be the bash/ffmpeg command to do so ?

  


  Thanks a lot

  


• Audio stuttering every couple of seconds

  27 juin 2019, par Glutch

  I’m merging a video (recorded with ffmpeg, good quality, all solid), with a musicfile.mp3. However every couple of seconds the music stutters and skips slightly. Which seems very strange since simply adding music on top of a video sounds like the engine could relax and take its time, creating no artifacts. (In comparison to recording live desktop footage). Can anyone help me sort this out ?

  System : MacOS MBP 2015, 16gb ram 2.7ghz i5

  ffmpeg -i "temp/1561246948349.mkv" -i "music/happy.mp3" -vcodec copy -filter_complex amix -map 0:v -map 0:a -map 1:a -shortest -b:a 144k "finished/2019-06-22/1561246948349/output.mkv"
  
  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, matroska,webm, from 'temp/1561246948349.mkv':
  
    Metadata:
  
      ENCODER         : Lavf58.20.100
  
    Duration: 00:00:21.50, start: 0.000000, bitrate: 5834 kb/s
  
      Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv422p(progressive), 2880x1800, 30 fps, 30 tbr, 1k tbn, 2000k tbc (default)
  
      Metadata:
  
        ENCODER         : Lavc58.35.100 libx264
  
        DURATION        : 00:00:21.467000000
  
      Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)
  
      Metadata:
  
        ENCODER         : Lavc58.35.100 libvorbis
  
        DURATION        : 00:00:21.496000000
  
  Input #1, mp3, from 'music/happy.mp3':
  
    Metadata:
  
      album           : Random
  
      genre           : Jazz & Blues
  
    Duration: 00:15:59.84, start: 0.025057, bitrate: 186 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 186 kb/s
  
      Metadata:
  
        encoder         : LAME3.100
  
  Stream mapping:
  
    Stream #0:1 (vorbis) -> amix:input0
  
    Stream #1:0 (mp3float) -> amix:input1
  
    amix -> Stream #0:0 (libvorbis)
  
    Stream #0:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  Output #0, matroska, to 'finished/2019-06-22/1561246948349/output.mkv':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Audio: vorbis (libvorbis) (oV[0][0] / 0x566F), 44100 Hz, stereo, fltp, 144 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libvorbis
  
      Stream #0:1: Video: h264 (High 4:4:4 Predictive) (H264 / 0x34363248), yuv422p(progressive), 2880x1800, q=2-31, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        ENCODER         : Lavc58.35.100 libx264
  
        DURATION        : 00:00:21.467000000
  
  frame=  640 fps=0.0 q=-1.0 Lsize=   15227kB time=00:00:21.46 bitrate=5810.3kbits/s speed=33.8x    
  
  video:14888kB audio:318kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 0.139864%