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• ffmpeg cut a video + make a rescaled preview (proxie)

  3 décembre 2020, par Hugo Monsieur

  I would like to cut (mulicut if possible else it's ok) a mp4 and generate the cut + a preview file in 360p.

  


  My goal is to achieve something that looks like that :

  


  `ffmpeg -y -progress /dev/stdout -i media.mp4
-vf "select='+between(t,0,25)',setpts=N/FRAME_RATE/TB"
-af "aselect='+between(t,0,25)’,asetpts=N/SR/TB"
-filter_complex split=2[mvideo][pvideo]
-map [mvideo] media_cut.mp4
-map [pvideo] -vf scale=-1:360 media_preview.mp4`


  


  Here, a first -vf select filter to multicut the media, a split filter to generate both the cut media and a resized cut with a second -vf on scale that keep aspect ratio with a width of 360.

  


  I can't mix filter with filter complex that's why i have no idea how to do it.

  


  Thanks a lot for your tips.

  


• Issue with yt-dlp and FFMPEG Converting Webm to MP4 for 360 video : Unsupported channel layout "ambisonic 1"

  22 janvier 2024, par William L W L

  I am trying to convert .webm files to mp4. These are 360 videos that have been downloaded using yt-dlp.

  


  I have been using this command successfully, but it does not work on an M2 macbook pro. It works fine on PC.

  


  ffmpeg -y -i "/Users/x/Movies/Tropical_Rainforest_360.webm" -c:v libx265 -preset fast -crf 21 -vf "scale=4096x4096:out_range=full" -pix_fmt yuvj420p -aspect 1:1 -movflags faststart "/Users/x/Movies/Tropical_Rainforest_360.mp4"


  


  The error messages are as follows :

  


  [aac @ 0x12ae1fea0] Unsupported channel layout "ambisonic 1"
[aac @ 0x12ae1fea0] Qavg: nan
[aost#0:1/aac @ 0x12ae1fc30] Error while opening encoder - maybe incorrect parameters such as bit_rate, rate, width or height.
Error while filtering: Invalid argument
[swscaler @ 0x110dd0000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x120158000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x130208000] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 1 times
[out#0/mp4 @ 0x600003f8c480] Nothing was written into output file, because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A    
Conversion failed!



  


  Context : I work in an educational setting which caters for vulnearble pupils. We cannot use Youtube in real time, this is mainly due to adverts or suggested videos that may trigger our pupils. Some children have mental health issues. Some children have also not been outdoors for several months/years due to medical conditions. We use 360 videos and VR to help bring the outside world inside, The YoutubeVR app is not an option since there is no way to install adblockers.

  


  The same script above works fine on a PC virtual machine which I can remote into from my Mac.

  


• FFMPEG returns negative values and stops rendering

  15 janvier 2020, par Mike

  While trying to get a 16:9 aspect output from any resolution input, I keep running into errors.

  This is, what I prompt :

  ffmpeg -i "input.mp4" -i "overlay.png" -strict -2 -vcodec h264 -aspect 16:9 -filter_complex "[0]scale=604:-2,pad=604:340:(604-iw)/2:(340-ih)/2[v];[v][1]overlay=x=W-w-5:y=H-h-5" -an "output.mp4"

  Errors are :

  [0] => [Parsed_pad_1 @ 0xeffca0] Negative values are not acceptable.
  
  [1] => [Parsed_pad_1 @ 0xeffca0] Failed to configure input pad on Parsed_pad_1
  
  [2] => Error configuring complex filters.
  
  [3] => Invalid argument

  I’m happy for any help.