Telegram Animated Sticker TGS Dependency Lottie - add to Docker Image

[computeronix]

As a feature request,

In PR #1173 there was mention of an external dependency for lottie.

So I don't have to create my own Docker image - could you add this dependency to the Docker image to support the capability in the PR?

[Funatiker]

You are talking about this Dockerfile? https://github.com/42wim/matterbridge/blob/master/tgs.Dockerfile

What is the external dependency that is missing?

[computeronix]

correct, "lottie cairosvg"

In the docker it looks like lottie is mentioned but when I went to ran this variable on Telegram it error'd out saying lottie was not there
MediaConvertTgs="png"

[Funatiker]

This is extremely confusing. The linked Dockerfile does work for me but only for png, not for webp.

Steps to reproduce:

1. Clone Repo as mattermost
2. Make a directory mattermost-config and in it serverlol
3. Run a webserver in serverlol using python3 -m http.server
4. Compile the repo mattermost using sudo docker build . -f tgs.Dockerfile -t matterbridge-lottie
5. Configure a matterbridge.toml in the mattermost-config directory with a telegram, and an XMPP interface, and one bridge for both. Also configure your webserver in it.
6. Start the container from mattermost-config with sudo docker run -ti --name matterbridge --mount "type=bind,source=$(pwd),target=/etc/matterbridge" matterbridge-lottie --debug
7. Send an animated sticker from telegram and receive a PNG (link)

Relevant debug output:

[0033] DEBUG gateway:      [func1:gateway/gateway.go:488] => Send from telegram.mytelegrambot (1873815045) to telegram.mytelegrambot (1873815045) took 200.335µs
[0033] DEBUG telegram:     [HandleDownloadSize:bridge/helper/helper.go:157] Trying to download "file_5.tgs.webp" with size 17984
[0033] DEBUG telegram:     [maybeConvertTgs:bridge/telegram/handlers.go:234] Tgs to PNG conversion enabled, converting 0xc000660940
[0034] DEBUG telegram:     [HandleDownloadData:bridge/helper/helper.go:173] Download OK "file_5.png" 84816

Used config:

[general]
        # this is in the mountpoint we will use in our docker container
        MediaDownloadPath="/etc/matterbridge/serverlol/"
        # the IP address in our local network, and the port announced by python
        MediaServerDownload="https://192.168.178.28:8000"
        # the converted lottie files get quite big, see #1459
        MediaDownloadSize=20000000

[telegram]
        [telegram.mytelegrambot]
        #See https://core.telegram.org/bots#6-botfather 
        #and https://www.linkedin.com/pulse/telegram-bots-beginners-marco-frau
        Token="…:…"
        RemoteNickFormat="<{NICK}> "
        # this enables lottie!
        MediaConvertTgs="png"

[xmpp]
        [xmpp.myxmppbot]
        Server="…:5222"
        #Jid your userid
        Jid="…@…"
        Password="…"
        Muc="…"
        Nick="Bridge"
        RemoteNickFormat="<{NICK}> "

[[gateway]]
        name="testbridge"
        enable=true

        [[gateway.inout]]
        account="telegram.mytelegrambot"
        channel="…"

        [[gateway.inout]]
        account="xmpp.myxmppbot"
        channel="…"

Weirdly, it doesn't for for webp:

$ sudo docker exec matterbridge lottie_convert.py --input-format lottie --output-format webp /etc/matterbridge/serverlol/06303fcc/file_2_tgs.webp /etc/matterbridge/serverlol/06303fcc/file_2_tgs_2.webp
Traceback (most recent call last):
  File "/usr/bin/lottie_convert.py", line 158, in <module>
    exporter.process(an, outfile, **o_options)
  File "/usr/lib/python3.8/site-packages/lottie/parsers/baseporter.py", line 18, in process
    return self.callback(*a, **kw)
  File "/usr/lib/python3.8/site-packages/lottie/exporters/gif.py", line 77, in export_webp
    raise Exception("WebP animations not supported in this system")
Exception: WebP animations not supported in this system

Looks like a certain webp library (libwebp-dev) isn't present in the right version: https://github.com/python-pillow/Pillow/blob/b3bb58746ca97229b728fea110701c9181a01b96/docs/handbook/image-file-formats.rst#saving-sequences https://pillow.readthedocs.io/en/latest/installation.html#building-on-linux

[Funatiker]

@computeronix I couldn't reproduce your bug. I compiles the tgs.Dockerfile as described above and it worked for png. After adding the dependency, I could compile the image, and even create webp files in the docker container.

[42wim]

Fixed in #1476 thanks to @Funatiker