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• how to make ffmpeg output frames at correct rate down to millisecond

  9 février 2017, par Pavel K.

  using ffmpeg, i am fetching frames from udp stream (hd264 at 25 fps) using following command :

  ffmpeg -loglevel debug -i udp ://231.20.20.146:2005 -fflags nobuffer -r 1 -preset ultrafast -vf scale=432:243 -f image2pipe -vcodec ppm pipe:1

  at the other end of the pipe i am running a very simple binary which outputs the time at which it receives a frame.

  however, even though i specify fps 1, frames enter the pipe with some delay, with 100-200ms delay.

  what causes this delay ? is it the decoding of the frames and encoding of ppm image ? and how can i force ffmpeg to send images at least at the correct distance between each other, so that each frame would arrive exactly 1000ms after previous frame ?

  ps. the first 6 frames are buffered and enter the pipe almost at once. here is an example of recorded ms values :

  5350
  5368
  5385
  5493
  5599
  5676
  5785
  6221
  7243
  8235
  9218
  10219
  11227
  12268
  13268
  14242
  15288
  16219
  17297
  18222
  19284
  20272

• ffmpeg / mencoder converting a video with correct setting

  22 août 2016, par Rick T

  I have an avi video file that plays on my Onn-W7 player Link to avi video file that works and backup link to avi file that works. I’m trying to convert some other video files over so that they will also play on it. I’ve tried handbrake, ffmpeg and mencoder but the video fails to work most likely do to the fact I have some settings wrong in the conversion process but I don’t know which ones any ideas how to fix this

  Here’s the settings of the avi file that works below :

  General
  
  Complete name                            : /tmp/ONN.avi
  
  Format                                   : AVI
  
  Format/Info                              : Audio Video Interleave
  
  File size                                : 11.0 MiB
  
  Duration                                 : 3mn 1s
  
  Overall bit rate                         : 508 Kbps
  
  Writing application                      : MEncoder Sherpya-MinGW-20060312-4.1.0
  
  Writing library                          : MPlayer
  
  
  
  Video
  
  ID                                       : 0
  
  Format                                   : MPEG-4 Visual
  
  Format profile                           : Simple@L3
  
  Format settings, BVOP                    : No
  
  Format settings, QPel                    : No
  
  Format settings, GMC                     : No warppoints
  
  Format settings, Matrix                  : Default (H.263)
  
  Codec ID                                 : XVID
  
  Codec ID/Hint                            : XviD
  
  Duration                                 : 3mn 1s
  
  Bit rate                                 : 371 Kbps
  
  Width                                    : 160 pixels
  
  Height                                   : 128 pixels
  
  Display aspect ratio                     : 5:3
  
  Original display aspect ratio            : 5:4
  
  Frame rate                               : 15.000 fps
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Compression mode                         : Lossy
  
  Bits/(Pixel*Frame)                       : 1.207
  
  Stream size                              : 8.00 MiB (73%)
  
  Writing library                          : XviD 1.1.0 (UTC 2005-11-22)
  
  
  
  Audio
  
  ID                                       : 1
  
  Format                                   : MPEG Audio
  
  Format version                           : Version 1
  
  Format profile                           : Layer 2
  
  Codec ID                                 : 50
  
  Duration                                 : 3mn 1s
  
  Bit rate mode                            : Constant
  
  Bit rate                                 : 128 Kbps
  
  Channel(s)                               : 2 channels
  
  Sampling rate                            : 44.1 KHz
  
  Compression mode                         : Lossy
  
  Stream size                              : 2.77 MiB (25%)
  
  Alignment                                : Split accross interleaves
  
  Interleave, duration                     : 26 ms (0.39 video frame)
  
  Interleave, preload duration             : 522 ms

  The ffmpeg command I tried is :

  ffmpeg -i "video_to_convert.mp4" -c:v libxvid -vf scale=160x128,setsar=1 -b:v 800k -r 15 -c:a libtwolame -ac 2 -ar 44100 -b:a 128k -y video_converted.avi

• Encoder (codec png) not found for output stream #0:0 [duplicate]

  7 juin 2016, par Anubhav Dhawan

  This question already has an answer here :

  • ffmpeg & png watermark issue
    
    2 answers
    

  I’m trying to create a NodeJS app that converts a video into a GIF image.

  I’m using node-gify plugin for this purpose, which uses FFmpeg and GraphicsMagick.

  Here’s my sample code :

  var gify = require('./');
  
  var http = require('http');
  
  var fs = require('fs');
  
  
  
  var opts = {
  
    height: 300,
  
    rate: 10
  
  };
  
  
  
  console.time('convert');
  
  gify('out.mp4', 'out.gif', opts, function(err) {
  
    if (err) throw err;
  
    console.timeEnd('convert');
  
    var s = fs.statSync('out.gif');
  
    console.log('size: %smb', s.size / 1024 / 1024 | 0);
  
  });

  And here’s my console error :

  > gify@0.2.0 start /home/daffodil/repos/node-gify-master
  
  > node example.js
  
  
  
  /home/daffodil/repos/node-gify-master/example.js:24
  
    if (err) throw err;
  
             ^
  
  
  
  Error: Command failed: /bin/sh -c ffmpeg -i out.mp4 -filter:v scale=-1:300 -r 10 /tmp/IP5OXJZELd/%04d.png
  
  ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --disable-yasm
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42mp41
  
      creation_time   : 2005-02-25 02:35:57
  
    Duration: 00:01:10.00, start: 0.000000, bitrate: 106 kb/s
  
      Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, stereo, fltp, 19 kb/s (default)
  
      Metadata:
  
        creation_time   : 2005-02-25 02:35:57
  
        handler_name    : Apple Sound Media Handler
  
      Stream #0:1(eng): Video: mpeg4 (Advanced Simple Profile) (mp4v / 0x7634706D), yuv420p, 192x242 [SAR 1:1 DAR 96:121], 76 kb/s, 15 fps, 15 tbr, 600 tbn, 1k tbc (default)
  
      Metadata:
  
        creation_time   : 2005-02-25 02:35:57
  
        handler_name    : Apple Video Media Handler
  
      Stream #0:2(eng): Data: none (rtp  / 0x20707472), 4 kb/s (default)
  
      Metadata:
  
        creation_time   : 2005-02-25 02:35:57
  
        handler_name    : hint media handler
  
      Stream #0:3(eng): Data: none (rtp  / 0x20707472), 3 kb/s (default)
  
      Metadata:
  
        creation_time   : 2005-02-25 02:35:57
  
        handler_name    : hint media handler
  
  Output #0, image2, to '/tmp/IP5OXJZELd/%04d.png':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42mp41
  
      Stream #0:0(eng): Video: png, none, q=2-31, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2005-02-25 02:35:57
  
        handler_name    : Apple Video Media Handler
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (mpeg4 (native) -> ? (?))
  
  Encoder (codec png) not found for output stream #0:0
  
  
  
      at ChildProcess.exithandler (child_process.js:213:12)
  
      at emitTwo (events.js:100:13)
  
      at ChildProcess.emit (events.js:185:7)
  
      at maybeClose (internal/child_process.js:827:16)
  
      at Socket.<anonymous> (internal/child_process.js:319:11)
  
      at emitOne (events.js:90:13)
  
      at Socket.emit (events.js:182:7)
  
      at Pipe._onclose (net.js:471:12)
  
  </anonymous>

  PS : I had a couple of problems installing FFmpeg on my Ubuntu 14.04.

  • First, FFmpeg is removed from Ubuntu 14.04 (legal issues AFAIK). But I managed to apt-get it through this.
  • Second, when I tried to ./configure (as mentioned in its README.md), I got this error - yasm/nasm not found or too old. Use --disable-yasm for a crippled build.. So I used ./configure --disable-yasm instead, and it (somehow) worked.

  Update #1

  After read this log a couple of times, I managed to produce a sample GIF from my mp4 file, by changing the command, which example.js tries to run :

  From

  ffmpeg -i out.mp4 -filter:v scale=-1:300 -r 10 /tmp/Lz43nx6wv1/%04d.png

  To

  ffmpeg -i out.mp4 -filter:v scale=-1:300 -r 10 out.gif

  But it’s still using command line, I need to do this by code.

  So I dived into the code and found that this wrong url is coming from the plugin’s index.js :

  ...
  
  
  
  // tmpfile(s)
  
    var id = uid(10);
  
    var dir = path.resolve('/tmp/' + id);
  
    var tmp  = path.join(dir, '/%04d.png');
  
  
  
  ...

  Is this an issue with the plugin, or am I doing something wrong here ?
  In any case, please put the correct stub here, because I don’t want to touch this part unless I know what I’m doing ?

  Update #2

  Now I installed zlib1g-dev, and then reinstalled both FFmpeg and graphicsMagick, and now I see this error :

  gm convert: No decode delegate for this image format (/tmp/ZQbEAynAcf/0702.png).

  Thanks in advance :)