I recently bought a Chromecast device, and I use VLC in my Linux computer to stream videos to our TV. Though not always, sometimes these videos come from YouTube, and I would like to be able to see the video subtitles in the TV, but as the time of writing this, VLC+Chromecast and subtitles don't seem to play along nicely (see https://code.videolan.org/videolan/vlc-android/issues/502).
While a future version of VLC is likely to include this feature, in the meantime I figured out the way to hardcode the subtitles. It is very easy, but time consuming, since we have to encode the video again. The following commands are an example of what needs to be done:
(useful to see the different available formats, and get the one that corresponds to 1280x720)
youtube-dl --list-formats https://www.youtube.com/watch?v=AW138ZTKioM
(and the available subtitles)
youtube-dl --list-subs https://www.youtube.com/watch?v=AW138ZTKioM
(download the video in the required format, -f, and convert the subtitles to the .srt format)
youtube-dl -f 22 --convert-subs srt --write-sub --sub-lang en https://www.youtube.com/watch?v=AW138ZTKioM
(use ffmpeg to reencode with the downloaded subtitles hardcoded)
ffmpeg -i The\ Anthropocene\ -\ The\ age\ of\ mankind\ -\ Docu\ -\ 2017-AW138ZTKioM.mp4 -vf "subtitles='The Anthropocene - The age of mankind - Docu - 2017-AW138ZTKioM.en.srt'" The_age_of_mankind.mp4
Done!
[update: 8/1/2019. Hardcoding the subtitles might be handy in several situations, but for watching YouTube videos via Chromecast, it is actually much easier to use Chromium (I'm using ArchLinux where Chrome is not in the official repositories), which comes with the option of casting YouTube, a given tab, or even the whole desktop).
Showing posts with label YouTube. Show all posts
Showing posts with label YouTube. Show all posts
Sunday, 6 January 2019
Saturday, 9 December 2017
Speeding up / down audio files
My children want to have some of the songs they listen on the radio in their MP3s.
This is a no-brainer. After they find the videos they want in YouTube, I put all the URLs in a file ('bajar.txt') and can get all the MP3 files with the following command.
youtube-dl -a bajar.txt -x --audio-format mp3 -o '%(title)s.%(ext)s'
But the second step is a bit more fun. One of the MP3s is wrong and it plays the songs a bit slower than it should. Instead of buying a new one, I just speed up the MP3 files in the computer before uploading them to the player. This script will just get all the *mp3 files in a directory, speed them up according to the SP factor, and copy them to the directory 'emma_mp3s', ready to upload to my daughter's player (modifying the IFS variable allows having white spaces in the file names)
#!/bin/bash
# mp3speed.sh # Adapted from https://ubuntuforums.org/showthread.php?t=1259851
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
FILES="*.mp3"
mkdir -p emma_mp3s
for f in $FILES
do
AR=96k
SP=1.08897 # Speed up: ini_length * (1/speedup) = final_length
echo Encoding $f
mplayer -af scaletempo -speed $SP $f -vc null -vo null -ao pcm:fast:waveheader:file=$f.wav
ffmpeg -i $f.wav -acodec libmp3lame -ab $AR emma_mp3s/$f
rm $f.wav
done
IFS=$SAVEIFS
This is a no-brainer. After they find the videos they want in YouTube, I put all the URLs in a file ('bajar.txt') and can get all the MP3 files with the following command.
youtube-dl -a bajar.txt -x --audio-format mp3 -o '%(title)s.%(ext)s'
But the second step is a bit more fun. One of the MP3s is wrong and it plays the songs a bit slower than it should. Instead of buying a new one, I just speed up the MP3 files in the computer before uploading them to the player. This script will just get all the *mp3 files in a directory, speed them up according to the SP factor, and copy them to the directory 'emma_mp3s', ready to upload to my daughter's player (modifying the IFS variable allows having white spaces in the file names)
#!/bin/bash
# mp3speed.sh # Adapted from https://ubuntuforums.org/showthread.php?t=1259851
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
FILES="*.mp3"
mkdir -p emma_mp3s
for f in $FILES
do
AR=96k
SP=1.08897 # Speed up: ini_length * (1/speedup) = final_length
echo Encoding $f
mplayer -af scaletempo -speed $SP $f -vc null -vo null -ao pcm:fast:waveheader:file=$f.wav
ffmpeg -i $f.wav -acodec libmp3lame -ab $AR emma_mp3s/$f
rm $f.wav
done
IFS=$SAVEIFS
Friday, 29 October 2010
Youtube videos to MP3 (or mpeg)
Today I wanted to download the music of a YouTube video, in order to show it to some friends off-line. It turns out that this is quite easy (for reference, this is using Ubuntu 10.04 LTS). (Information consulted: http://hubpages.com/hub/Youtube-to-MP3-on-Ubuntu-Linux and http://lookherefirst.wordpress.com/2007/12/15/how-to-convert-flv-files-to-mpg-or-mp3/).
The first step is to get the aptly named script youtube-dl. The version available in Ubuntu 10.04 is 2010.04.04, but this does not work properly anymore, and it gives the following error when trying to download a video:
If we download the latest version (2010.10.24) from http://bitbucket.org/rg3/youtube-dl/wiki/Home, and just copy the file to /usr/bin/youtube-dl, then we have no trouble and the video (in .flv format) is saved:
Then, in order to convert it to an MP3 you will need ffmpeg and the libmp3lame0 library (and in Ubuntu 10.04, perhaps also in others, the package libavcodec-unstripped-52, so that ffmpeg cand find libmp3lame). With this in place, a small script will take care of everything:
As an example:
Despite its name, we can also use the script as-is to convert Youtube videos for example to mpeg format:
The first step is to get the aptly named script youtube-dl. The version available in Ubuntu 10.04 is 2010.04.04, but this does not work properly anymore, and it gives the following error when trying to download a video:
angelv~$ youtube-dl http://www.youtube.com/watch?v=BTwhEPiv0U8
[youtube] Setting language
[youtube] BTwhEPiv0U8: Downloading video info webpage
[youtube] BTwhEPiv0U8: Extracting video information
ERROR: format not available for video
angelv~$
If we download the latest version (2010.10.24) from http://bitbucket.org/rg3/youtube-dl/wiki/Home, and just copy the file to /usr/bin/youtube-dl, then we have no trouble and the video (in .flv format) is saved:
angelv~$ youtube-dl http://www.youtube.com/watch?v=BTwhEPiv0U8
[youtube] Setting language
[youtube] BTwhEPiv0U8: Downloading video webpage
[youtube] BTwhEPiv0U8: Downloading video info webpage
[youtube] BTwhEPiv0U8: Extracting video information
[download] Destination: BTwhEPiv0U8.flv
[download] 100.0% of 7.73M at 59.74k/s ETA 00:00
angelv~$ ls -lt *flv
-rw-r--r-- 1 angelv dialout 8100631 2010-10-29 10:01 BTwhEPiv0U8.flv
angelv~$
Then, in order to convert it to an MP3 you will need ffmpeg and the libmp3lame0 library (and in Ubuntu 10.04, perhaps also in others, the package libavcodec-unstripped-52, so that ffmpeg cand find libmp3lame). With this in place, a small script will take care of everything:
#!/bin/bash
x=$RANDOM.flv
youtube-dl --output=$x "$1"
ffmpeg -i $x -ar 44100 -ab 160k -ac 2 "$2"
rm $x
As an example:
angelv~/temp$ yt2mp3 http://www.youtube.com/watch?v=BTwhEPiv0U8 chiclana.mp3
[youtube] Setting language
[youtube] BTwhEPiv0U8: Downloading video webpage
[youtube] BTwhEPiv0U8: Downloading video info webpage
[youtube] BTwhEPiv0U8: Extracting video information
[download] Destination: 17660.flv
[download] 100.0% of 7.73M at 59.97k/s ETA 00:00
FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
configuration: --extra-version=4:0.5.1-1ubuntu1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --e\
nable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc \
--enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
libavutil 49.15. 0 / 49.15. 0
libavcodec 52.20. 1 / 52.20. 1
libavformat 52.31. 0 / 52.31. 0
libavdevice 52. 1. 0 / 52. 1. 0
libavfilter 0. 4. 0 / 0. 4. 0
libswscale 0. 7. 1 / 0. 7. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Mar 4 2010 12:41:55, gcc: 4.4.3
Seems stream 0 codec frame rate differs from container frame rate: 49.99 (4999/100) -> 25.00 (25/1)
Input #0, flv, from '17660.flv':
Duration: 00:03:24.44, start: 0.000000, bitrate: 253 kb/s
Stream #0.0: Video: h264, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 253 kb/s, 25 tbr, 1k tbn, 49.99 tbc
Stream #0.1: Audio: aac, 22050 Hz, stereo, s16
Output #0, mp3, to 'chiclana.mp3':
Stream #0.0: Audio: libmp3lame, 44100 Hz, stereo, s16, 160 kb/s
Stream mapping:
Stream #0.1 > #0.0
Press [q] to stop encoding
size= 4003kB time=204.93 bitrate= 160.0kbits/s
video:0kB audio:4003kB global headers:0kB muxing overhead 0.000781%
angelv~/temp$ ls -lt *mp3
-rw-r--r-- 1 angelv dialout 4098644 2010-10-29 10:34 chiclana.mp3
angelv~/temp$ Despite its name, we can also use the script as-is to convert Youtube videos for example to mpeg format:
angelv@vaso:~$ yt2mp3 http://www.youtube.com/watch?v=McdD9Ng4VnY funny.mpg
angelv@pilas:~$ youtube-dl --extract-audio --audio-format=mp3 http://www.youtube.com/watch?v=suTKOmmoBtw[youtube] Setting language[youtube] suTKOmmoBtw: Downloading video webpage[youtube] suTKOmmoBtw: Downloading video info webpage[youtube] suTKOmmoBtw: Extracting video information[download] Destination: suTKOmmoBtw.flv[download] 100.0% of 13.89M at 80.60k/s ETA 00:00[avconv] Destination: suTKOmmoBtw.mp3angelv@pilas:~$
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