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• How to concatenate variables and strings as a full path for the "output file" of an ffmpeg command in a bash script

  12 mai 2022, par djspatule

  I'm trying to learn to bash scripting and I tried to use variables and arguments, etc. to specify a complex output file name to a ffmpeg command as follows :

  


  for file in "$1"/*; do
    #get the name of each file in the directory (without the path nor the extension)
    filename=$(basename $file .mp3)
    #use mimic for Text To Speech. Difficult to install but good and natural voices.
    ~/Desktop/mimic1/mimic -t "$filename" -o $1/wavefile.wav
    #converts the wav file outputed by mimic into mp3
    ffmpeg -i $1/wavefile.wav -f mp3 "${1}/${filename} (title).mp3"
done



  


  But the "${1}/${filename} (title).mp3" part in particular really doesn't seem to work...

  


  Indeed, if I run script.sh ./, I get a file called (title).mp3

  


  Can you help me figure out what it is I'm doing wrong ?
Thanks a million in advance.
Best,

  


  P.S. : i also get earlier in the terminal's output basename: extra operand ‘.mp3’...like my whole code is wrong....?

  


• Revision a1f15814be : Clamp decoded feature data Not all segment feature data elements are full-range

  27 novembre 2012, par John Koleszar

  Changed Paths : Modify /vp9/common/vp9_seg_common.c Modify /vp9/common/vp9_seg_common.h Modify /vp9/decoder/vp9_dboolhuff.c Modify /vp9/decoder/vp9_dboolhuff.h Modify /vp9/decoder/vp9_decodframe.c Modify /vp9/encoder/vp9_bitstream.c Modify /vp9/encoder/vp9_boolhuff.c (...)

• Cut a video in between key frames without re-encoding the full video using ffpmeg ? [closed]

  13 juillet 2024, par bguiz

  I would like to cut a video at the beginning at any particular timestamp, and it need to be precise, so the nearest key frame is not good enough.

  


  Also, these videos are rather long - an hour or longer - so I would like to avoid re-encoding this altogether if possible, or otherwise only re-encode a minimal fraction of the total duration. Thus, would like to maximise the use of -vcodec copy.

  


  How can I accomplish this using ffmpeg ?

  


  NOTE : See scenario, and my own rough idea for a possible solution below.

  


  ---

  


  Scenario :

  


  

  • Original video

    

    • Length of 1:00:00

    


    • Has a key frame every 10s

    


    


  


  • Desired cut :

    

    • From 0:01:35 through till the end

    


    


  


  • Attempt #1 :

    

    • Using -ss 0:01:35 -i blah.mp4 -vcodec copy, what results is a file where :

    


    • audio starts at 0:01:30

    


    • video also starts at 0:01:30

    


    • this starts both the audio and the video too early

    


    


  


  • using -i blah.mp4 -ss 0:01:35 -vcodec copy, what results is a file where :

    

    • audio starts at 0:01:35,

    


    • but the video is blank/ black for the first 5 seconds,

      

      • until 0:01:40, when the video starts

      


      


    


    • this starts the audio on time,
but the video starts too late

    


    


  


  


  ---

  


  Rough idea

  


  

  • (1) cut 0:01:30 to 0:01:40

    

    • re-encode this to have new key frames,
including one at the target time of 0:01:35

    


    • then cut this to get the 5 seconds from 0:01:35 through 0:01:40

    


    


  


  • (2) cut 0:01:40 through till the end

    

    • without re-encoding, using -vcodec copy

    


    


  


  • (3) ffmpeg concat the first short clip (the 5 second one)
with the second long clip

  


  


  I know/ can work out the commands for (2) and (3), but am unsure about what commands are needed for (1).