Recherche avancée

Sur d’autres sites (7431)

• mp3 and multiple image convert to mp4 [on hold]

  16 mai 2017, par Henrik C Wiberg

  I need some guidance to convert an mp3 audio file, along with multiple photos to an mp4 file, using php/laravel.

  It must end with a mp4 file with a slideshow of images along with an audio file.

  How do you recommend me to begin the task ?
  I have this Json :

  {
  
  - data [
  
   {
  
      id: 1,
  
      name: "item 1",
  
      image: "image_1.jpg",
  
      start: "2017-01-01T02:00:00",
  
      end: "2017-01-01T02:30:00"
  
    },
  
    {
  
      id": 2,
  
      name: "item 2",
  
      image: "image_2.jpg",
  
      start: "2017-01-01T02:31:00",
  
      end: "2017-01-01T02:50:00"
  
    },
  
    {
  
      id": 3,
  
      name: "item 3",
  
      image: "image_3.jpg",
  
      start: "2017-01-01T02:51:00",
  
      end: "2017-01-01T03:00:00"
  
    }
  
  ],
  
  - meta {
  
     audiofile: {
  
      mp3: 'example.com/audio/audiofile.mp3',
  
      start: "2017-01-01T02:00:00",
  
      end: "2017-01-01T03:00:00"  
  
   }
  
  }   

  This json must be converted to one mp4 file, where image has to be placed and displayed on a timeline while ’audiofile.mp3’ is playing.

  Or do you know some code samples I can see ? :-)

• After transcoding using ffmpeg, I found audio bitrate is not the value I expected

  16 mai 2017, par penny

  I used ffmpeg to transcode some files into new format and with certain parameters. After transcoding, I found some output file’s metadata is not what I expected, the output value is not the same with I set in the cmd line.

  Before transcoding I check the media info of the inputfile :

  ffmpeg -i dz2015082000010.mpg

  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-9)
  configuration : —enable-static —enable-memalign-hack —enable-libx264
  —enable-gpl —enable-pthreads —enable-version3 —enable-avisynth —enable-bzlib —enable-iconv —enable-zlib —enable-nonfree —extra-cflags=-I/usr/local/include/ —extra-ldflags=-L/usr/local/lib —enable-debug=3 —disable-optimizations —enable-nonfree —enable-libmp3lame libavutil 55. 34.101 / 55. 34.101 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.101 /
  57. 56.101 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 / 4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 /
  54. 1.100 Input #0, mpeg, from ’dz2015082000010.mpg’ : Duration : 00:01:49.30, start : 0.685389, bitrate : 15723 kb/s
  Stream #0:0[0x1e0] : Video : mpeg2video (Main), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], 15000 kb/s, 25 fps, 25 tbr,
  90k tbn, 50 tbc
  Stream #0:1[0x1c0] : Audio : mp2, 48000 Hz, stereo, s16p, 384 kb/s At least one output file must be specified

  Next, transcoding with the cmd line :

  ffmpeg -i dz2015082000010.mpg -vcodec libx264 -b:v 4000k -s 1920x1080 -r 25 -g 25  -vprofile main -acodec aac -strict -2 -b:a 128k -ac 2 -ar 44100 -y output.ts

  After transcoding, I check the media info of the output file :

  ffmpeg -i output.ts    

  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 4.8.3 (GCC) 20140911 (Red Hat
  4.8.3-9) configuration : —enable-static —enable-memalign-hack —enable-libx264 —enable-gpl —enable-pthreads —enable-version3 —enable-avisynth —enable-bzlib —enable-iconv —enable-zlib —enable-nonfree —extra-cflags=-I/usr/local/include/ —extra-ldflags=-L/usr/local/lib —enable-debug=3 —disable-optimizations —enable-nonfree —enable-libmp3lame libavutil 55. 34.101 / 55. 34.101 libavcodec 57. 64.101
  / 57. 64.101 libavformat 57. 56.101 / 57. 56.101
  libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100
  / 6. 65.100 libswscale 4. 2.100 / 4. 2.100
  libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100
  / 54. 1.100 Input #0, mpegts, from ’full-2.ts’ : Duration :
  00:01:49.30, start : 1.456778, bitrate : 4455 kb/s Program 1
  Metadata :
  service_name : Service01
  service_provider : FFmpeg
  Stream #0:0[0x100] : Video : h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr,
  90k tbn, 50 tbc
  Stream #0:1[0x101] : Audio : aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 4 kb/s At least one output file must be
  specified

  I don’t know why the audio bitrate is changed to 4 kb/s after transcoding, I set the value with -b:a 128k before, anybody can help me ? BTW, the output file sounds all right.

• Looping back and forth through frames with ffmpeg

  18 mai 2017, par sebb

  I have a set of ten PNG frames that I’d like to convert to a "boomerang style" mp4 file (i.e go from frame 1 to frame 10, then from 9 to 2). I’d like to find something similar to ImageMagick’s patrol cycle, but can’t figure out how to to it with ffmpeg.

  I thought it would be possible to do this using concat but :

  • I think it’s dirty
  • My command simply does not work :)

  Here’s my command so far :

  -framerate 5 -i "concat:01.png|02.png|03.png|04.png|05.png|06.png|07.png|08.png|09.png|10.png|09.png|08.png|07.png|06.png|05.png|04.png|03.png|02.png" -pix_fmt yuv420p output.mp4

  I get a video file but it just goes from 1 to 10 once.

  Here’s ffmpeg’s saying hello :

  ffmpeg version N-86098-g3fefaea Copyright (c) 2000-2017 the FFmpeg developers
  
  
  
    built with gcc 6.3.0 (GCC)
  
  
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
  
  
    libavutil      55. 63.100 / 55. 63.100
  
  
  
    libavcodec     57. 96.101 / 57. 96.101
  
  
  
    libavformat    57. 72.101 / 57. 72.101
  
  
  
    libavdevice    57.  7.100 / 57.  7.100
  
  
  
    libavfilter     6. 89.101 /  6. 89.101
  
  
  
    libswscale      4.  7.101 /  4.  7.101
  
  
  
    libswresample   2.  8.100 /  2.  8.100
  
  
  
    libpostproc    54.  6.100 / 54.  6.100

  Anyone has an idea ?

  Thanks !