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• avcodec/videotoolboxenc : Fix bitrate doesn't work as expected

  16 juillet 2024, par Zhao Zhili

  avcodec/videotoolboxenc : Fix bitrate doesn't work as expected
  Commit 4ef5e7d4722 add qmin/qmax support to videotoolbox encoder.
  
  The default value of (qmin, qmax) is (2, 31), which makes bitrate
  
  control doesn't work as users' expectations.
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavcodec/videotoolboxenc.c

• ffmpeg volume not work in complex filter

  6 février 2018, par rick lee

  "volume" filter does not work in complex filter. The volume is not affected in the converted audio.

  env : Mac OS 10.12.6

  ffmpeg -i /path/bg.mp3 -y -filter_complex [0:0]volume=0[output] -map 
  
  [output] -acodec libmp3lame -write_xing 0 /path/mixed.mp3

  full log =====================================================================

  liqideMacBook-Pro:pinyin-api work$ ffmpeg -i 
  
  /Users/work/dev/codebase/pinyin/pinyin-api/test/resources/bg_audio2.mp3 
  
  -y -filter_complex [0:0]volume=0.1[output] -map [output] -acodec 
  
  libmp3lame -f mp3 -write_xing 0 /Users/work/dev/codebase/pinyin/pinyin-
  
  api/test/resources/mixed3.mp3
  
  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.1 --enable-
  
  shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --
  
  enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-
  
  gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-
  
  opencl --enable-videotoolbox --disable-lzma
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mp3, from '/Users/work/dev/codebase/pinyin/pinyin-
  
  api/test/resources/bg_audio2.mp3':
  
    Metadata:
  
      title           : 喜洋洋
  
      album           : 贺岁新年音乐会
  
      encoder         : Lavf56.4.101
  
    Duration: 00:02:43.58, start: 0.025057, bitrate: 128 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 (mp3) -> volume
  
    volume -> Stream #0:0 (libmp3lame)
  
  Press [q] to stop, [?] for help
  
  Output #0, mp3, to '/Users/work/dev/codebase/pinyin/pinyin-
  
  api/test/resources/mixed3.mp3':
  
    Metadata:
  
      TIT2            : 喜洋洋
  
      TALB            : 贺岁新年音乐会
  
      TSSE            : Lavf57.83.100
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp
  
      Metadata:
  
        encoder         : Lavc57.107.100 libmp3lame
  
  [libmp3lame @ 0x7fad80001a00] Trying to remove 1152 samples, but the 
  
  queue is empty
  
  size=    2556kB time=00:02:43.57 bitrate= 128.0kbits/s speed=51.7x
  
  video:0kB audio:2556kB subtitle:0kB other streams:0kB global 
  
  headers:0kB muxing overhead: 0.003782%
  
  liqideMacBook-Pro:pinyin-api work$

  =====================================================================

• I thought adding double quotes if you have spaces in file or folder directories would work here, but it doesn't ?

  17 novembre 2022, par Newb Coder

  for %%f in ("F:\folder\another subfolder + name that has a space like this and (that also has these round brackets here somewhere) and [these square brackets]\folder 3\file1 [info in square brackets - [more, info in a nested square bracket]].mkv") 
    do ffmpeg -ss 00:18:22.000 -i "%%f" -ss 00:00:0.500 -t 00:03:5.000 -c copy "%%~nf+1.mkv"


  


  This is my batch script, that I um, stole from someone, (coz why reinvent the wheel when the wheel already exists and tested working by someone else, right ?) which has worked on many other single and multiple media files at once that don't have spaces in them or file directories that don't, but as soon as I add one that does like in the above example, the batch script refuses to work.

  


  Google'd a bit and read that you need to add quotes. Well I tried both double and single quotes and they don't work... So why doesn't quotes work in this instance...?