#!/bin/sh
##
## SCRIPT: 00_ffmpeg_CONVERTmovie_to_h264-aac-mp4.sh
##
## PURPOSE: Convert a movie file (such as '.mpg', '.avi', '.wmv') to
##          a '.mp4' movie file --- with 'h264' video stream and
##          'aac' audio stream.
##
## REFERENCE1:
##
## https://www.streamingmedia.com/Articles/ReadArticle.aspx?ArticleID=133179
## (2019 Jul)
## Here's the basic FFmpeg command line structure:
## 
## ffmpeg -i input.mp4 output.mp4
## 
## FFmpeg can input most container formats natively, including MP4,
## .ts, MOV, AVI, Y4M, MKV, and many others.
## 
## Note that unless you identify an audio or video codec via switches,
## FFmpeg will use the default codecs for each container format
## as well as reasonable encoding parameters.
## 
## ** For the MP4 extension, if you input a 1080p file, FFmpeg will encode
## ** using the H.264 video codec at about 9 to 10 Mbps, the AAC audio codec
## ** at around 130 Kbps, a keyframe interval of 250 frames, the High profile,
## ** and the medium x264 preset.
## 
## *** All of these are customizable, of course, but if all you're trying to do
## *** is to create a video file you can play from a hard drive,
## *** the command above will suffice.
## 
## REFERENCE2: (in case the simple command above does not work)
##
## https://duduf.com/easily-transcode-any-media-to-any-format-using-ffmpeg/
## (2017 Oct)
## 
## An excerpt:
## 
## If you need to change some parameters of the video, you can input
## a new size, change the framerate, change the audio sampling...
## 
## ffmpeg -i "example video.mov" \
##        -vcodec h264 -b:v 10485760 \
##        -s 1998x1080 \
##        -r 24 -acodec aac -b:a 327680 -ar 96000 \
##        "transcoded video.mp4"
##    
## The size is changed to a standard 2K Flat DCP  of 1998 pixels width by 1080 pixels
## height with the -s option, the framerate to 24fps with the -r option, and
## the sound is resampled to 96KHz thanks to the -ar option.
##
## METHOD OF USE: 
##   1) Put this script in the directory of to-be-converted movie files
##      that you want to convert to 'filename_h264-aac.mp4'.
##   2) Edit this script to set the input & output filenames.
##   3) Run the script in a terminal window positioned at the directory
##      that holds this script and the movie files.
##
## DEVELOPED WITH: ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019
##
## Script started: 2021jul15
##


ffmpeg -i \
   input_40sec_640x480_mpeg1-mp2.mpg \
   output_40sec_640x480_h264-aac.mp4
   
#  00_temp.mp4
 
# totem 00_temp.mp4
# ffplay 00_temp.mp4

exit