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• How do i get ffprobe to parse 'TAG : timecode' into ffmpeg 'drawtext' command ? (Bash Terminal)

  4 juin 2019, par Myles

  I have a .mov file that contains original source timecode metadata but i can’t figure out a way to get ffmpeg to burn the original timecode into the picture.

  If i open the original file in QuickTime Player we can see it displays the true timecode on the far left :
  

  I can also see that ffprobe is able to see the metadata when i run the following :

  Command :

  ffprobe -i test.mov -show_streams

  Abbreviated Result :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2018-11-05T14:20:51.000000Z
  
      timecode        : 09:59:53:00
  
    Duration: 00:16:37.64, start: 0.000000, bitrate: 1680 kb/s

  So i can see that ffprobe is able to determine the start timecode of the file in its metadata results. The question is how to i pass that information into an ffmpeg command so that the timecode seen by ffprobe is what gets used when i convert the file for timecode burn-in ?

  An example of a standard burnt in timecode command would be this :

  ffmpeg -i test.mov -vcodec libx264 -cmp 22 -vf
  "drawtext=fontfile=DroidSansMono.ttf : timecode=’09:59:53:00’ : r=25 :
  x=(w-tw)/2 : y=h-(2*lh) : fontcolor=white : box=1 : boxcolor=0x00000099"
  -y test_bitc.mov

  The only problem there though is that i’ve had to manually put the timecode in myself. I want the command to use the existing timecode metadata as the timecode input value so the same command can be used on multiple files.

  Does anyone know how to do this ?

• PHP cannot run a python script that uses ffmpeg (when the python script runs in terminal)

  10 février, par dr3kiki

  In my website, a user uploads an audio file that gets mixed by a python script. The python script uses ffmpeg to translate the files, however it doesn't work when I try executing via php due to ffmpeg, I get this error

  


  usr/local/lib/python3.9/site-packages/pydub/utils.py:170 : RuntimeWarning : Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work")

  


  The python script can run (with no errors) in the Linux terminal and ffmpeg can run separately also in the terminal (in the website's directory).

  


  I have tried linking the environment with php with putenv("/usr/bin/ffmpeg") which had no luck, as well as linking to the usr/local/lib/python3.9/site-packages/ directory in the same way, also no luck.

  


• FFMPEG Command working ok from terminal but not when launched as a process

  16 juin 2023, par Pit Digger

  I am launching an FFMPEG process from C++ , the command is workign fine from command line, but gives error when laucnhed from code. What could cause this ?

  


  [AVFilterGraph @ 0x3cfadc0] Error parsing filterchain '"[0:v]split=3[v1][v2][v3] ;[v1]copy[v1out] ;[v2]scale=w=1280:h=720[v2out] ;[v3]scale=w=640:h=360[v3out]"'

  


  AVFilterGraph @ 0x3cfadc0] Trailing garbage after a filter : split=3[v1][v2][v3] ;[v1]copy[v1out] ;[v2]scale=w=1280:h=720[v2out] ;[v3]scale=w=640:h=360[v3out]"

  


  Command :

  


  ffmpeg -re -i input.mp4 -c copy -filter_complex "[0:v]split=3[v1][v2][v3] ;[v1]copy[v1out] ;[v2]scale=w=1280:h=720[v2out] ;[v3]scale=w=640:h=360[v3out]" -map [v1out] -c:v:0 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v:0 1M -maxrate:v:0 2M -minrate:v:0 2M -bufsize:v:0 2M -preset fast -g 48 -sc_threshold 0 -keyint_min 48 -map [v2out] -c:v:1 libx264 -x264-params 'nal-hrd=cbr:force-cfr=1' -b:v:1 1M -maxrate:v:1 1M -minrate:v:1 1M -bufsize:v:1 1M -preset fast -g 48 -sc_threshold 0 -keyint_min 48 -map [v3out] -c:v:2 libx264 -x264-params 'nal-hrd=cbr:force-cfr=1' -b:v:2 500K -maxrate:v:2 500K -minrate:v:2 500K -bufsize:v:2 500K -preset fast -g 48 -sc_threshold 0 -keyint_min 48 -map a:0 -c:a:0 aac -b:a:0 96k -ac 2 -map a:0 -c:a:1 aac -b:a:1 96k -ac 2 -map a:0 -c:a:2 aac -b:a:2 48k -ac 2 -avoid_negative_ts 1 -f hls -hls_time 6 -hls_list_size 15 -hls_flags independent_segments -hls_segment_type mpegts -hls_segment_filename /output/stream_%v_data%02d.ts -master_pl_name index.m3u8 -var_stream_map 'v:0,a:0 v:1,a:1 v:2,a:2' /output/stream_%v.m3u8