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• FFmpeg matlab error : At least one output file must be specified ? [closed]

  3 mars, par as moh

  I'm trying to get I frames from a video using Matlab using this command system(sprintf('ffmpeg -i testVid.mp4 -vf "select=eq(pict_type\,I)" -vsync vfr output_%03d.png')); ,but i get this message

  


   ffmpeg version 7.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers 
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project) 
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint 
  libavutil      59. 39.100 / 59. 39.100 
  libavcodec     61. 19.100 / 61. 19.100 
  libavformat    61.  7.100 / 61.  7.100 
  libavdevice    61.  3.100 / 61.  3.100 
  libavfilter    10.  4.100 / 10.  4.100 
  libswscale      8.  3.100 /  8.  3.100 
  libswresample   5.  3.100 /  5.  3.100 
  libpostproc    58.  3.100 / 58.  3.100 
Trailing option(s) found in the command: may be ignored. 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testVid.mp4': 
  Metadata: 
    major_brand     : isom 
    minor_version   : 512 
    compatible_brands: isomiso2avc1mp41 
    encoder         : Lavf57.83.100 
  Duration: 00:00:02.02, start: 0.000000, bitrate: 12798 kb/s 
  Stream #0:0[0x1](eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1280x720 [SAR 1:1 DAR 16:9], 12662 kb/s, 29.74 fps, 30 tbr, 90k tbn (default) 
      Metadata: 
        handler_name    : VideoHandler 
        vendor_id       : [0][0][0][0] 
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 121 kb/s (default) 
      Metadata: 
        handler_name    : SoundHandler 
        vendor_id       : [0][0][0][0] 
At least one output file must be specified 


  


  i searched and tried many cases but i don't know where is the problem, any help please ?

  


• aacenc_tns : clamp filter direction energy measurement

  8 février, par Lynne

  aacenc_tns : clamp filter direction energy measurement
  The issue is that :
  float en[2] ;
  
  ...
  
  tns->n_filt[w] = is8 ? 1 : order != TNS_MAX_ORDER ? 2 : 3 ;
  
  for (g = 0 ; g < tns->n_filt[w] ; g++) 
  
      tns->direction[w][g] = slant != 2 ? slant : en[g] < en[!g] ;
  
  When using the AAC Main profile, n_filt = 3, and slant is by
  
  default 2 (normal long frames), g can go above 1.
  en is the evolution of energy in the frequency domain for every
  
  band at the given window. E.g. whether the energy is concentrated
  
  at the top of each band, or the bottom.
  For 2-pole filters, its straightforward.
  
  For 3-pole filters, we need more than 2 measurements.
  This commit properly implements support for 3-pole filters, by measuring
  
  the band energy across three areas.
  Do note that even xHE-AAC caps n_filt to 2, and only AAC Main allows
  
  n_filt == 3.
  Fixes https://trac.ffmpeg.org/ticket/11418
  

  • [DH] libavcodec/aacenc_tns.c

• avcodec/amfdec,rkmppdec : Use correct extradata with BSFs

  11 juin, par Andreas Rheinhardt

  avcodec/amfdec,rkmppdec : Use correct extradata with BSFs
  Otherwise the extradata used would be ISOBMFF if the input is
  
  even though we use the *_mp4toannexb BSFs to convert it to
  
  annex B to feed it to the actual decoder.
  (The mediacodec decoders also use said BSFs, yet they process
  
  the extradata in a way that works even when using the ISOBMFF
  
  extradata ; in fact, using the converted extradata would break
  
  their check for whether to warn for missing extradata for
  
  the ISOBMFF without-in-band-header profiles.
  Furthermore, there are several users of the *_mp4toannexb BSFs
  
  that don't ever touch extradata. They have not been touched.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/amfdec.c
  • [DH] libavcodec/decode_bsf.h
  • [DH] libavcodec/rkmppdec.c