61 lines
1.8 KiB
Bash
61 lines
1.8 KiB
Bash
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#!/bin/bash -e
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#####################################################
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#
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# This command will re-encode a video into an MP4
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# container with H264 video and AAC audio encoded to
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# 96K. Each of the arguments are explained as follows:
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#
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# -i "${INPUT}"
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# Sets the first argument, saved as variable "$INPUT"
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# as the input file that ffmpeg will re-encode. Must
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# go at the beginning of your command.
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#
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# -codec:video libx264
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# Sets the video codec to libx264, which is the library
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# ffmpeg uses to encode H264 video streams.
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#
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# -preset slow
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# Sets the preset of the H264 encoding process to run
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# slow, which can yield higher quality imagery at the
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# expense of speed. Available options:
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# ultrafast, superfast, veryfast, faster, medium (default),
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# slow, slower, veryslow, placebo
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#
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# -crf 22
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# Sets the Constant Rate Factor of the video stream,
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# which determines the data rate. The range of -crf
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# values range from 0 to 51, with 0 being visually
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# lossless and 51 being extremely compressed.
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#
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# -codec:audio aac
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# Sets the codec of the output audio stream to AAC.
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#
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# -b:a
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# Sets the data rate of the audio to 192kbit/s.
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#
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# "${OUTPUT}"
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# The output video file, which should be the last
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# argument you provide.
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#
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# Usage: bash ffmpeg/basic/reencode.sh <input video> <output video>
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#
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#####################################################
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INPUT="${1}"
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OUTPUT="${2}"
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# Check if input and output arguments are supplied
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if [ "${INPUT}" == "" ] || [ "${OUTPUT}" == "" ]; then
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echo "Please provide input and output files as your first and second arguments"
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exit 1
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fi
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# Check if file extension is .mp4
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if [[ "${OUTPUT}" != *".mp4" ]]; then
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echo "Please use an .mp4 extension on your output file argument"
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exit 2
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fi
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# Command to re-encode the input video into H264/AAC
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ffmpeg -i "${INPUT}" -codec:video libx264 -preset slow -crf 22 -codec:audio aac -bitrate:audio 192k "${OUTPUT}"
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