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• using ffmpeg command line with python's subprocess module [on hold]

  3 décembre 2013, par user1485853

  I have few wav files that I can use either of the following command line mentioned here to concatenate

  ffmpeg -f concat -i <(for f in ./*.wav; do echo "file '$f'"; done) -c copy output.wav
  
  ffmpeg -f concat -i <(printf "file '%s'\n" ./*.wav) -c copy output.wav
  
  ffmpeg -f concat -i <(find . -name '*.wav' -printf "file '%p'\n") -c copy output.wav

  anyone know how to convert either of them to work with python's subprocess module, it would be better if your solution is platform independent .

  the <(...) notation does is create a temporary file to
  contain the result, and inserts that file name on the command line. so is there any way to create a temporary file by Python here ?

• Are there any examples/documentation available that demonstrate how to use FFMPEG libraries directly in Python/C instead of the command line ?

  8 janvier 2021, par Zaid Bhat

  I want to perform the operation done by the below command line of FFMPEG but only using the command line. Instead I want to use the underlying libraries directly in Python and C to perform the operation :

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  ffmpeg -i "Filename.ts" -map 0:d -c copy -f data "outputfile.bin" | python ./klvdata_test.py

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  The task at hand is to extract the metadata. Are there any examples/documentation demonstrating the use of underlying libraries of FFMPEG.

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• In-line way to create a thumbnail for a processed video

  11 avril 2022, par Cryden

  Usually, when FFmpeg converts a video the result does not have a thumbnail on my computer, only showing the default blank 'mp4' thumb. I am trying to make a command line that will convert videos and also give the output a thumbnail. I've found a lot of examples of how to pull an image from a video, but not how to in-line make sure it has a thumbnail.

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  The main function I want is for any type of video to be converted to hevc_nvenc/aac/mov_text.

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  Currently, my command looks like this :

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  ffmpeg -i "pth_in.mp4" -i "pth_in.mp4" -movflags faststart -map 0:v:0 -map 1:v -c:v hevc_nvenc -preset slow -map 1:a? -c:a aac -b:a 128k -map 1:s? -c:s ssa -filter:v:0 thumbnail,scale=360:-1,trim=end_frame=1 -c:v:0 mjpeg -disposition:0 attached_pic "pth_out.mp4"

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  where the double input and -filter:v:0 thumbnail,scale=360:-1,trim=end_frame=1 -c:v:0 mjpeg -disposition:0 attached_pic is supposed to create the thumbnail. It DOES, however, as it stands this command will also cause the video's seek bar to malfunction, only working for about 3 seconds using MPC-HC and VLC, although the video will still play in its entirety.

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  Is there any way to do this in 'one' pass like I'm trying ? Or do I have to split it up and do something else ? Is there any other faux pas I'm making ? Thanks for any help !

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