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• Inputing a List of Files for Concatenation with Node.js Module fluent-ffmpeg

  26 juin 2018, par carpiediem

  Version information

  • fluent-ffmpeg version : 2.1.2
  • ffmpeg version : 3.4.2
  • OS : Windows 10

  Code to reproduce

  ffmpeg('C:/path/to/list.txt').mergeToFile('C:/path/to/out.mp4', 'C:/path/to/temp');

  list.txt :

  file 'C:/path/to/chunk01.ts'
  
  file 'C:/path/to/chunk02.ts'
  
  file 'C:/path/to/chunk03.ts'
  
  file 'C:/path/to/chunk04.ts'

  Note : I’ve tried both absolute and relative paths, with the same result.

  Expected results

  A video file at C:/path/to/out.mp4 that matches the 4 files in list.txt, concatenated end-to-end.

  Observed results

  An empty file at C:/path/to/out.mp4 with 0 duration and only 15kB in size. No errors were thrown.

  This is the command that I’m trying to duplicate (it works as expected, with relative paths in list.txt) :

  C:/path/to> ffmpeg -f concat -i list.txt -c copy out.ts

  stdout & stderr

  stdout was empty. stderr is copied below (with file names modified to match the ones above) :

  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
  
    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
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, tty, from 'C:/path/to/list.txt':
  
    Duration: 00:00:00.08, bitrate: 42 kb/s
  
      Stream #0:0: Video: ansi, pal8, 640x400, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 (ansi) -> concat
  
    concat -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 000001e385b45040] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 000001e385b45040] profile High 4:4:4 Predictive, level 3.0, 4:4:4 8-bit
  
  [libx264 @ 000001e385b45040] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'C:/path/to/out.mp4':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 640x400, q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.107.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=    2 fps=0.0 q=-1.0 Lsize=      15kB time=00:00:00.04 bitrate=3099.0kbits/s speed=1.55x
  
  video:14kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.619430%
  
  [libx264 @ 000001e385b45040] frame I:1     Avg QP:12.71  size:  8083
  
  [libx264 @ 000001e385b45040] frame P:1     Avg QP:29.71  size:  5928
  
  [libx264 @ 000001e385b45040] mb I  I16..4: 87.9%  0.0% 12.1%
  
  [libx264 @ 000001e385b45040] mb P  I16..4:  9.3%  0.0%  0.0%  P16..4:  0.4%  0.0%  0.0%  0.0%  0.0% skip:90.3%
  
  [libx264 @ 000001e385b45040] coded y,u,v intra: 17.9% 0.0% 0.0% inter: 0.1% 0.0% 0.0%
  
  [libx264 @ 000001e385b45040] i16 v,h,dc,p: 88%  8%  4%  0%
  
  [libx264 @ 000001e385b45040] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 31% 19%  3%  2%  3%  7%  4%  3%
  
  [libx264 @ 000001e385b45040] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 000001e385b45040] kb/s:1401.10

• Pass options containing spaces to ffmpeg using fluent-ffmpeg

  10 janvier 2019, par dansumption

  I am writing a Node script which copies and re-tags some of my MP4 files using fluent-ffmpeg

  It doesn’t work with any metadata that contains spaces. The code that does the copying/tagging looks something like this :

  const ffmpeg = require('fluent-ffmpeg');
  
  
  
  const inputFilename = 'path/to/original.m4a';
  
  const outputFilename = 'path/to/new.m4a';
  
  
  
  const options = [
  
      '-metadata', 'artist=Someone',
  
      '-metadata', 'album=Some title',
  
      // ...etc
  
  ];
  
  
  
  ffmpeg(inputFilename)
  
    .outputOptions(options)
  
    .saveToFile(outputFilename);

  This results in an error :

  events.js:183
  
        throw er; // Unhandled 'error' event
  
  
  
  An error occurred: ffmpeg exited with code 1: title: Invalid argument

  I have tried putting Some title in single quotes, double quotes and no quotes. I have tried escaping the spaces in it. I have tried passing the options array as single options rather than tuples, for example : '-metadata album="Some title"' - but whatever I try, it still throws an error when there are spaces.

  (It may be relevant to note that this is on Windows)

  Can anyone suggest a way of getting it to work ?

• Node.js - Buffer Data to Ffmpeg

  24 septembre 2017, par user8568709

  I used Node.js and Ffmpeg to create animations. Because I was trying to avoid third-party avi/mp4 parsers, I decided to output the animation as raw rgb24 data file and then use some program to convert it to mp4 file.

  I found that Ffmpeg is free and open source which can do exactly it. So, I made a Node.js application which allocates a Buffer of size 1920 x 1080 x 3 (width times height times number of bytes per pixel), then I created a rendering context library, and finally I animated frame by frame and saved each frame consecutivelly in a binary file (using fs module).

  Then I invoked Ffmpeg to convert it to mp4 file and it works very good. Animations are pretty easy to make and Ffmpeg does its job correctly.

  However, the only problem is because it is very slow and eats space on hard disk. I want to create very long animations (more than a hour). The final mp4 file is relativelly small, but raw video file is extremelly big. About ninety percents of each frame are black pixels, so Ffmpeg comress it very good, but raw file cannot be compressed and it takes sometimes mor ethan 100 Gigabytes. Also, there is very unnecessary double processing same data. Firstly I process it in Node.js to save data to file, and then Ffmpeg reads it to convert it to mp4. There is a lot of unnecessary work.

  So, I’m looking for a way (and I’m pretty sure it is possible, but I didn’t find a way to do it yet) to output raw video data (one frame at a time) to Ffmpeg process (without saving anything to the hard disk).

  My goal is to do the following :

  1. Open Ffmpeg process
  2. Render a frame in Node.js
  3. Output raw byte stream to Ffmpeg
  4. Wait for Ffmpeg to encode it and append to mp4 file
  5. Let Ffmpeg wait for my Node.js process to render next frame

  ---

  Is there a way to achieve it ? I really don’t see a reason to post code, because my current code has nothing to do with the question I’m asking here. I don’t struggle with syntax errors or implementation problems. No, instead I just don’t know which parameters to pass to Ffmpeg process in order to achieve what I’ve already explained.

  I’ve searched in documentation to find out which parameters I need to pass to Ffmpeg process in order to let it read raw data from stdin instead from file, and also to wait until my Node.js process render next frame (so to disable time limit) because rendering a frame may take more than 24 hours. Therefore, Ffmpeg process should wait without time limit. However, I didn’t find anything about it in documentation.

  I know how to write to stdin from Node.js and similar technical stuff, so no need to explain it. The only question(s) here :

  1. Which parameters to pass to Ffmpeg ?
  2. Do I need to create Ffmpeg process (using child_process) with some special options ?

  ---

  Thank you in advance. Please, take it easy, this is my first question ! :)