我用iPhone SE(11.4.1)和1080H / 30 fps录制了一段视频。我想用ffmpeg尽可能多地提取单个冻结帧


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我用iPhone SE,iOS版本11.4.1(15G77)录制了一个视频。

我想以最佳可用质量提取尽可能多的单个和冻结帧。我想我每秒最多可以获得30个冻结帧?

随着ffmpeg -i /tmp/IMG_1234.MOV -r 1/1 /tmp/$filename%03d.bmp 我只得到一个每秒冻结帧。

我需要做些什么才能获得尽可能多的不同/个别冻结帧?

下一步是提取不是整个视频的冻结帧,而是仅从位置a到位置b。例如,从00:05到00:10(mm:ss)的所有帧。

这些是ffmpeg关于文件的信息:

ffmpeg -i /home/merlin/Downloads/IMG_8087.MOV 
ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  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, mov,mp4,m4a,3gp,3g2,mj2, from '/home/merlin/Downloads/IMG_8087.MOV':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2018-09-04T05:43:47.000000Z
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone SE
    com.apple.quicktime.software: 11.4.1
    com.apple.quicktime.creationdate: 2018-09-04T07:43:47+0200
  Duration: 00:00:17.48, start: 0.000000, bitrate: 15925 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 15818 kb/s, 29.98 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2018-09-04T05:43:47.000000Z
      handler_name    : Core Media Data Handler
      encoder         : H.264
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 95 kb/s (default)
    Metadata:
      creation_time   : 2018-09-04T05:43:47.000000Z
      handler_name    : Core Media Data Handler
    Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2018-09-04T05:43:47.000000Z
      handler_name    : Core Media Data Handler
    Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2018-09-04T05:43:47.000000Z
      handler_name    : Core Media Data Handler
At least one output file must be specified

提前谢谢您抽出宝贵的时间:)

Answers:


1

看起来这个-r 30/1参数做了我想要的。

ffmpeg -i /tmp/IMG_1234.MOV -r 30/1 /tmp/$filename%03d.bmp

不知道是否有更多参数可以获得更加清晰的冻结帧。


-r 30够了,不需要分裂。如果您的帧看起来不清晰,那很可能是运动模糊,这是原始视频的一部分。视频播放时你不会察觉到。寻求查看:superuser.com/questions/377343 / ...
slhck
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