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• download part youtube video with ffmpeg ?

  1er août 2020, par testoflow

  I can't get this right
  
ffmpeg works well so can you help me ?

  


  #I can't get this right

  


  #!/bin/bash
var=$(xclip -o)

if [ -z $var ]; then  
    echo 'copia url a descargar al portapapeles'  
fi  

printf "(1) download part of video without audio\n"
printf "(2) download part of audio\n"
echo
echo -n 'opcion: '
read opcion
case $opcion in
    "1") c=$(youtube-dl -g $var | awk '{ if(NR==1) print $0 }' | sed 's/^/"/;s/$/"/')  && echo -n 'start time: ' && read segundos && echo -n 'duration: ' && read duration &&  ffmpeg -i $c -ss $segundos -t $duration probe.mp4;;  
    "2") b=$(youtube-dl -g $var | awk '{ if(NR==2) print $0 }' | sed 's/^/"/;s/$/"/')  && echo $b && ffmpeg -ss 0 -i $b  -t 10 probe.mp3;;  
esac  


  


• ffmpeg extracts only part of 1 audio stream from .ts file

  6 juillet 2020, par Shakalakah

  Here is what ffprobe input.ts shows :

  


    libavutil     56. 55.100 / 56. 55.100
  libavcodec    58. 93.100 / 58. 93.100
  libavformat       58. 47.100 / 58. 47.100
  libavdevice       58. 11.100 / 58. 11.100
  libavfilter         7. 86.100 /  7. 86.100
  libswscale          5.  8.100 /  5.  8.100
  libswresample       3.  8.100 /  3.  8.100
  libpostproc       55.  8.100 / 55.  8.100
Input #0, mpegts, from 'D:\Downloads\TEST\audio.ts':
  Duration: 02:22:29.67, start: 0.000000, bitrate: 51 kb/s
  Program 1
    Stream #0:0[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 83 kb/s


  


  So the length of .ts file is 2h:22m:29.67s and looks like it contains only audio (AAC) : when i open it in Windows Media Player i can jump to any position within the 2h:22m range and hear sound playing, and there is no video on the screen. This makes me think the extracted audio will also be of 2h:22m length, but i get only a 51m:14s file.

  I tried the following commands :

  1) ffmpeg -i input.ts -vn -acodec copy outputaudio.aac

  2) ffmpeg -i input.ts -map 0:v -map 0:a -c copy outputaudio.aac (as far as i understood this is "extract ALL audiotracks" command)

  3) ffmpeg -i input.ts -ss 00:00:00 -t 02:22:29.6 -q:a 0 -map a outputaudio.aac (to force extraction to the full length, i.e. 2h:22m)

  4) ffmpeg -i input.ts -map 0:a outputaudio.aac -map 0:v outputonlyvideo.avi (i heard this is an alternative way to force extraction of full-length audio through simultaneous extraction of video. Though looks like my .ts has no video, i decided to try this command too and got an error message : Stream map '0:v' matches no streams)

  What am i doing wrong ? Which alternative commands can i try ?

  Is it possible, that the real length of audio stream is 51m:14s only ? But why i can listen to all 2h:22m length in Windows Media Player - could 51m:14s piece be somehow looped inside .ts to create an impression of 2h:22m length ?

  


• FFmpeg concat filter part 2

  16 juin 2020, par Narek Aydinyan

  I have videos. The video files have a different count of video tracks.

  



  video1 = 1 video stream + 1 audio stream.

  



  video2 = 2 video stream + 1 audio stream.

  



  The output result should be 2(concatenated) video streams, 1 audio stream.

  



  The same issue for the Audio case solved in my previous question(FFmpeg concat filter).
Also, I want to mark that I need to generate a video track with custom size.
For example, I can do this with color filter but this filter has fixed image sizes(https://ffmpeg.org/ffmpeg-utils.html#toc-Color) 
Thanks in advance