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• Changing portrait videos to landscape aspect with latest ffmpeg release is breaking

  19 décembre 2016, par zeal

  I am having an issue scaling videos recorded in portrait with the latest version of ffmpeg (2.1). This worked fine in a previous version, but I need the lastest version to fix a different issue.

  I am trying to take any video passed and make it 852 wide by 480 high. It works fine when converting videos that are wider then tall, but when the video is taller then wide it corrupts the video. It actually adds a letter box to the top and bottom, rather then left and right. Also, the meta data shows it as the correct height & width, but its wrong when played in windows.

  Here are the parameters I am using.

  ffmpeg -i INPUT -s 852x480 -r 30 -aspect 1.775 -b:v 2000000 -vcodec mpeg4 -vf "scale=iw*min(852/iw\,480 /ih):ih*min(852/iw\,480 /ih),pad=852:480 :(852-iw)/2:(480 -ih)/2" -ac 2 -b:a 128k -ar 44100 -y OUTPUT

  Console output from ffmpeg -i INPUT -r 30 -b:v 2000000 -vcodec mpeg4 -vf "scale=852:480" -ac 2 -b:a 128k -ar 44100 -y OUTPUT :

  C:\Lib>ffmpeg -i "d\ca96cd13-2995-4794-b753-22be3b918659.mov" -r 30 -b:v 2000000 -vcodec mpeg4 -vf "
  
  scale=852:480" -ac 2 -b:a 128k -ar 44100 -y "d\portx.mp4"
  
  ffmpeg version N-58015-g8cdf4e0 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov 10 2013 18:04:45 with gcc 4.8.2 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32thread
  
  s --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-icon
  
  v --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-
  
  libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
  
  b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr -
  
  -enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --
  
  enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enab
  
  le-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 52.100 / 52. 52.100
  
    libavcodec     55. 41.100 / 55. 41.100
  
    libavformat    55. 21.100 / 55. 21.100
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.102 /  3. 90.102
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'd\ca96cd13-2995-4794-b753-22be3b918659.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 0
  
      compatible_brands: qt
  
      creation_time   : 2013-11-12 15:02:21
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
      encoder         : 7.0.2
  
      encoder-eng     : 7.0.2
  
      date            : 2013-11-12T10:02:21-0500
  
      date-eng        : 2013-11-12T10:02:21-0500
  
      make            : Apple
  
      make-eng        : Apple
  
    Duration: 00:00:15.48, start: 0.000000, bitrate: 780 kb/s
  
      Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 480x360, 7
  
  05 kb/s, 29.98 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2013-11-12 15:02:21
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-11-12 15:02:21
  
        handler_name    : Core Media Data Handler
  
  Output #0, mp4, to 'd\portx.mp4':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 0
  
      compatible_brands: qt
  
      make-eng        : Apple
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
      make            : Apple
  
      encoder-eng     : 7.0.2
  
      date            : 2013-11-12T10:02:21-0500
  
      date-eng        : 2013-11-12T10:02:21-0500
  
      encoder         : Lavf55.21.100
  
      Stream #0:0(und): Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 852x480, q=2-31, 2000 kb/s, 15360
  
   tbn, 30 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2013-11-12 15:02:21
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(und): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128
  
   kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-11-12 15:02:21
  
        handler_name    : Core Media Data Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> mpeg4)
  
    Stream #0:1 -> #0:1 (aac -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  frame=  465 fps=417 q=3.8 Lsize=    4118kB time=00:00:15.52 bitrate=2173.3kbits/s
  
  video:3860kB audio:243kB subtitle:0 global headers:0kB muxing overhead 0.348231%

• Convert HEVC/H.265 video to a more widely supported format using fluent-ffmpeg in Node.js

  21 juin 2021, par Daniel Loiterton

  My app allows users to upload videos from their phones. However, the latest iPhone default format (HEVC / H.265) does not seem to be supported by Chrome and other browsers, so some users cannot stream the videos.

  


  I'm already using fluent-ffmpeg on my Node.js backend to read metadata and extract thumbnails from the uploaded videos. How would I go about converting HEVC videos to something else ? What format/options would be appropriate for streaming to browsers ? Ideally I'd like to keep files fairly small, and I'm willing to sacrifice some quality to that end.

  


• ffmpeg configure for ios - using asm options causes MPx (mp1, mp2, mp3) codecs sound problems

  18 avril 2013, par hard gamer

  I've made many tests to get good performance for video decoding with ffmpeg on low cpu idevices such as iPad 1 and iPhone 3Gs, and see that using asm option when configuring ffmpeg for cross compiling for ios is very very important for performance..

  But when I configure with —enable-asm, the audio stream which using mpx(mp1,mp2,mp) codec sounds squeaky.
  If I configure with —disable-asm option, than mpx(mp1,mp2,mp) codec sounds well but then the performance is %50 percent of the previous one built with the —enable-asm option...

  I've also tested these with the ffmpeg versions that are 0.8, 0.9, 0.10, 0.11, 1.0,1.1,1.2
  All of them produces same results...

  Can anyone have the same problem with me ? Also, any idea how can I fix this issue ? please advice me .. (I can not find any patch to fix this issue on the net or in ffmpeg forums.)

  -MS