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• Video Encode different parts of video using different bitrates

  8 février 2015, par khateeb

  If I’ve a video like : video-lectures

  

  And I need to encode the slides with high bitrate (as it’s the most important to the user) and encode the rest of the view with low bitrate.

  1. Select the part to encode with high bitratre.
     

  2. Separately Encoding the different parts with different bitrates.

  

  3. Combine the different parts into one video.

  The purpose is to reduce the total file-size to be published online, hence reduce the bandwidth needed.
  I need to do that using ffmpeg.
  I’ll use that approach in encoding video-lectures recorded with still camera (180 degree view like the images above), since I know which regions are more useful to students (board and slides) than other regions.

• What is the proper input format for drawtext's timecode option in fluent-ffmpeg (node.js) ?

  24 janvier 2023, par Gil Dekel

  I am trying to generate short video clips from 3 images with a simple millisecond counter at the top left per user request. So far I was able to generate the clips using the videoshow npm lib, no issues here.

  



  However, when I try to add the timer via fluent-ffmpeg's drawtext filter to an already generated video, I run into the following issue.

  



  Here's what I have so far :

  



  ffmpeg('video.mp4')
    .on('error', function(err, stdout, stderr) {
      console.log("ffmpeg stdout:\n" + stdout);
      console.log("ffmpeg stderr:\n" + stderr);
    })
    .videoCodec('libx264')
    .format('mp4')
    .fps(fps)
    .complexFilter([
        {
            filter: 'drawtext',
            options: {
                fontsize: 15,
                timecode: '00\:00\:00\:00',  //<--- Issue is most likely here
                fontsize: 32,
                fontcolor: 'white',
                boxcolor: 'black',
                box: 1
            }
        }
    ]).save('out.mp4');


  



  From what I found online I am quite convinced that my problem is with the timecode input format. Here's my error log :

  



  ffmpeg stderr:
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-nonfree
  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 'video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 00:00:01.03, start: 0.000000, bitrate: 585 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x1136 [SAR 923:924 DAR 130:231], 573 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    Metadata:
      handler_name    : VideoHandler
[Parsed_drawtext_0 @ 0x7f91aa700700] Both text and text file provided. Please provide only one
[AVFilterGraph @ 0x7f91aa700440] Error initializing filter 'drawtext' with args 'fontsize=32:timecode=00:00:00:00:fontcolor=white:boxcolor=black:box=1'
Error initializing complex filters.
Invalid argument


  



  Specifically this :

  



  [Parsed_drawtext_0 @ 0x7f91aa700700] Both text and text file provided. Please provide only one


  



  When I run what should be the equivalent to my code in shell, it works perfectly :

  



  ffmpeg -i video.mp4 \
       -vf drawtext="fontsize=15:timecode='00\:00\:00\:00':rate=60:fontsize=32:fontcolor='white':\
           boxcolor=0x000000AA:box=1" \
       -f mp4 out.mp4


  



  I already spent a whole day trying to find any previous solutions to this problem, or documentation online regarding the proper format of drawtext's timecode option within node.js with no luck. It seems most of the information out there is for bash/shell use. I need to do this programmatically on a server per request, and I just can't find the right example to solve this.

  



  Any help to resolve this would be appreciated.

  


• Video duration not detected by moviepy

  27 août 2023, par Kyv

  I have downloaded a video online, and wanted to add a background sound to it.
I followed this link :
Combining an audio file with video file in python
But, while reading the file

  


  my_clip = mpe.VideoFileClip('file.mp4')


  


  I get the error [mov,mp4,m4a,3gp,3g2,mj2 @ 00000152769e78c0] moov atom not found : path/to/file.mp4 Invalid data found when processing input from line 320 in the github resource https://github.com/victorcampos7/tensorflow-ffmpeg/blob/master/ffmpeg_reader.py
How to overcome this issue ?
  
The video I am testing on : https://simgool.com/salon/SHY4xAqxVZ