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• Read and check the duration of small mp4 files in a directory then concatenate into 3 mins each then assign a unique name in BASH

  23 septembre 2020, par super_nooba

  OS : Darwin Kernel Version 19.6.0

  


  Step 1 : Scan all the files until it reaches 3 mins of duration

  


  for f in *.mp4; 
do ffmpeg -i "$f" 2>&1 | grep "Duration" \
   | grep -o " [0-9:.]*, " | head -n1 | tr ',' ' ' \
   | awk -F: '{ print ($1 * 3600) + ($2 * 60) + $3 }')


  


  How do I assign a variable or loop until it reaches the combination of different videos until 3 mins minimum and 4 mins max ?

  


  Step 2 : Concatenate and assign a unique name when 3 mins is reached

  


  ffmpeg -i concat $f


  


  Step 3 : Resize to 1080p and fit to screen (spatial conform to fit)

  


  Step 4 : Continue until all the files have been concatenated

  


• How do steps for make FFMPEG

  11 août 2017, par mobina varmazyar

  I do step 1 to step 6. I am sure that I take NDK and ffmepeg source in valid address but when I execute

  ./build_android.sh

  in the terminal the following lines will be shown :

  @mv103 telegram

  Can send for me libraries whose can successfully did step 1 to 6 ?

  /build_android.sh: line 8: --prefix=/root/桌面/rajabi/android-ndk-
  
  r12b/sources/ffmpeg-3.3.3/android/arm: No such file or directory
  
  ./build_android.sh: line 9: --enable-shared: command not found

• Frame accurate seeking over extracted stream using ffmpeg

  7 septembre 2017, par nsp

  I am doing the following :

  Step 1 :
  Extracting a part of an 10min long mp4 clip, between 00:01:00.000 to 00:02:00.000 using the following option :

  ffmpeg -ss 60.000 -t 60.000 -i input.mp4 -copyts -an -c copy extracted_minute.mp4

  Step 2 : Use the following command to extract 10 second out of the 1 minute extracted clip (extracted_minute.mp4) and further encode it :

  ffmpeg -seek_timestamp 1 -ss 60.000 -i extracted_minute.mp4 -t 10.000 -copyts -an -filter:v "select='between(t\\,60.000\\,70.000)'[out];[out]setpts=PTS-STARTPTS" -c:v libx264 -y 10sec_encode.mp4

  I am facing issues when I try to seek on the extracted media in Step 2. I see that the "-ss/-t" option in "Step 2" somehow seems to operate on timestamps (starting from 0) and not the original timestamps (which had to start from 60) that are present in the stream, even though -copyts option is used. If I use -ss 0 and -t 10 in Step 2, I am able to extract frames. But, not when I use -ss 60 and -t 10.

  Am I missing something here, or is this the expected behavior from FFmpeg ?
  Is there any other method in which I can do frame accurate seeking for Step 2 ?

  Note :

  1. I need to be able to extract sequences from an already extracted stream
  2. Using -copyts option so that i have control over the exact sequences that I am extracting