user4426: Is there a good free way to convert iPhone HEVC footage to .mov prores or something similar using a Mac (MacOS 10.12) with Premiere CC 2017?  Googling provides lots of unreliable looking apps from companies I haven't heard of. Any good (preferably free) recommendations?

user4426: Install Homebrew.
Open Terminal.
Install FFMPEG with extra features by entering the following on a single line:
brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-libass  --with-libvorbis --with-libvpx --with-opus --with-x26

Wait about 10 minutes for it to install.  
From the Terminal, run FFMPEG, using a line like this:
ffmpeg -i input.mov -c:v prores -profile:v 3 -c:a pcm_s16le output.mov

input.mov is the name of your HEVC file.  It can also include a full path, but spaces need to be preceded by backslashes  “\”
output.mov is an exported ProRes quicktime movie that will play in Premiere
Do process more than one file at a time:
In terminal, go to the directory where your files are.
for i in *.mov; do ffmpeg -i "$i" -c:v prores -profile:v 3 -c:a pcm_s16le "${i%.*}_out.mov"; done

Output files will appear in the same folder appended with “_out.mov”

user22728: Go with handbrake.  It's a free GUI program for performing transcodes.  It is even used to benchmark processors and graphics cards.

4426: <p>Is there a good free way to convert iPhone HEVC footage to .mov prores or something similar using a Mac (MacOS 10.12) with Premiere CC 2017?  Googling provides lots of unreliable looking apps from companies I haven't heard of. Any good (preferably free) recommendations?</p>
 4426: <p>Install <a href="https://brew.sh/" rel="nofollow noreferrer">Homebrew</a>.</p>

<p>Open Terminal.
Install FFMPEG with extra features by entering the following on a single line:</p>

<pre><code>brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-libass  --with-libvorbis --with-libvpx --with-opus --with-x26
</code></pre>

<p>Wait about 10 minutes for it to install.  </p>

<p>From the Terminal, run FFMPEG, using a line like this:</p>

<pre><code>ffmpeg -i input.mov -c:v prores -profile:v 3 -c:a pcm_s16le output.mov
</code></pre>

<p><code>input.mov</code> is the name of your HEVC file.  It can also include a full path, but spaces need to be preceded by backslashes  “\”</p>

<p><code>output.mov</code> is an exported ProRes quicktime movie that will play in Premiere</p>

<p>Do process more than one file at a time:</p>

<p>In terminal, go to the directory where your files are.</p>

<pre><code>for i in *.mov; do ffmpeg -i "$i" -c:v prores -profile:v 3 -c:a pcm_s16le "${i%.*}_out.mov"; done
</code></pre>

<p>Output files will appear in the same folder appended with “_out.mov”</p>
 22728: <p>Go with handbrake.  It's a free GUI program for performing transcodes.  It is even used to benchmark processors and graphics cards.</p>
