Download and merge multiple video files (from twitch or youtube)

Last year I posted how to download and merge clips manually, recently I threw together a script that takes a twitch video, downloads the mp4 files, and them merges them all.

You'll have to download and compile ffmpeg which is a hassle, but since I use this script often it's worth the trouble.

#!/bin/bash
tempfolder=$(mktemp -d --tmpdir=./)

pushd $tempfolder
read -p "Input the date (YYYY-MM-DD): " date
echo "files:"
youtube-dl -e $@    # lists the file titles
echo "choosing one"
default_name=$(youtube-dl -e $@ 2>&1| head -1)
read -p "Name is $default_name. Override?: " name
if [ -z "$name" ]; then
    name=$default_name
fi

youtube-dl $@
file=$(mktemp --tmpdir=./)
for i in *.flv; do
    echo "file '$i'";
done > $file
ffmpeg -f concat -i $file -c copy "$date - $name.mp4"
mv "$date - $name.mp4" ..

popd
rm -r $tempfolder

The script will actually take multiple links as well, and concat them in order according to the twitch IDs.

Downloading and trimming clips

There are two ways to download the clips, and get them the converted for Mythtv (the right times, etc)

1) twitchtv:
# youtube-dl "http://www.twitch.tv/riotgamesoceania/b/457578762"
downloads many parts
# for i in *.flv; do echo "file '$i'"; done > inputs.txt
# ffmpeg -f concat -i inputs.txt -c copy output.mp4

Youtube doesn't need this, because they show up as one file. However, they do still need to be trimmed. If you need to trim it then, mark the times.

For example:
'input.webm' start: 5:27:00 end: 8:28:28
Then you can convert the file with ffmpeg:
# ffmpeg -y -ss 5:27:00 -t 3:01:28 -i 'input.webm' -c copy 'output.webm'