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I'm trying to install GStreamer into a docker container in a Raspberry Pi with Raspbian. It works ok but v4l2h264enc is not available.

# gst-inspect-1.0 v4l2h264enc
No such element or plugin 'v4l2h264enc'

I have tried to follow the same installation but installing directly to Raspbian and everything worked fine with v4l2h264enc included.

This is my Dockerfile:

# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

FROM ubuntu:19.10

# Use GCE apt servers
ARG GCE_REGION=us-west1
RUN cp /etc/apt/sources.list /etc/apt/sources.list.orig && \
    sed -i "s/archive.ubuntu.com/${GCE_REGION}.gce.archive.ubuntu.com/g" /etc/apt/sources.list

# Install essentials
RUN \
    apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
        curl \
        build-essential \
        ca-certificates \
        git \
        vim

WORKDIR /opt


ARG GST_BUILD_VERSION=1.18

# cloner repo for each gstreamer module
RUN git clone https://github.com/GStreamer/gst-build && cd gst-build && git checkout ${GST_BUILD_VERSION}

WORKDIR /opt

# Install base build deps
RUN \
    apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
        autopoint \
        autoconf \
        automake \
        autotools-dev \
        libtool \
        gettext \
        bison \
        flex \
        gtk-doc-tools \
        libtool-bin \
        libgtk2.0-dev \
        libgl1-mesa-dev \
        libopus-dev \
        libpulse-dev \
        libgirepository1.0-dev \
        libv4l-dev \
        libmount-dev \
        libva-dev \
        libusrsctp-dev \
        libvpx-dev


RUN \
    apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
        libwebrtc-audio-processing-dev \
        libssl-dev \
        libsrtp2-dev

ARG USRSCTP_VERSION=6ce0f8fe7455e566a6833684ec5983547658856d
RUN \
    git clone https://github.com/sctplab/usrsctp.git && \
    cd usrsctp && git checkout ${USRSCTP_VERSION} && \
    ./bootstrap && ./configure --prefix=/usr && \
        make && make install && make clean

# Install meson build deps
RUN \
    apt-get update && apt install -y python3-pip python-gi-dev ninja-build && \
    pip3 install meson

# Install libnice from source
ARG LIBNICE_VERSION=d6087ae5e0c1de2555f64d792c144d49bd816920
RUN \
    git clone https://gitlab.freedesktop.org/libnice/libnice.git && \
    cd libnice && git checkout ${LIBNICE_VERSION} && \
    meson build --prefix=/usr && \
    ninja -C build install

# Build and install gst-plugins-ugly from source
# This package includes the x264 encoder for non-nvenc accelerated pipelines.
RUN \
    apt-get update && apt install -y libx264-155 libx264-dev

# Install meson build deps
RUN \
    apt-get update && apt install -y python3-pip python-gi-dev ninja-build && \
    pip3 install meson

# Build gstreamer
RUN \
    cd /opt/gst-build && \
    meson builddir && \
    ninja -C builddir