For anybody else irritated by watching all of the short segments stitched togeth...

For anybody else irritated by watching all of the short segments stitched together by the video player at the Internet Archive, I wrote this script to concatenate the mp4 segments and re-encode as a single mp4 file.

  #!/bin/sh
  
  DIR=$1
  
  BASE=$(basename $DIR)
  
  echo copying from $DIR to create $BASE.mp4
  
  # copy the files over
  mkdir $BASE
  cp -v $DIR/*.xml .
  cp -v $DIR/*.mp4 $BASE/
  
  echo done copying
  echo convert segments to ts files
  
  # convert all the mp4 files to intermediate transport stream format
  for f in $BASE/?????.mp4; do
      echo "$f -> $f.ts"
      ffmpeg -i $f -c copy -bsf:v h264_mp4toannexb -f mpegts $f.ts > /dev/null 2>&1
  done
  
  # concatenate all the ts files and then re-encode them to mp4
  echo concatenate ts files and re-encode as mp4
  (cd $BASE;
   ffmpeg -i $(echo -n "concat:"; for f in *.ts; do echo -n "$f|"; done) -c copy -bsf:a aa  c_adtstoasc ../$BASE.mp4
  )
  
  # clean up
  echo clean up
  rm -rf $BASE
  echo done