From c88008a68f2bf95b591acd20fa37070ca21741ba Mon Sep 17 00:00:00 2001
From: Peter Bubestinger-Steindl <p.bubestinger@av-rd.com>
Date: Mon, 4 Nov 2019 22:55:07 +0100
Subject: [PATCH] Added "streamhash" recipe.

---
 index.html | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/index.html b/index.html
index 8bae9ae..4116073 100644
--- a/index.html
+++ b/index.html
@@ -1997,6 +1997,47 @@
     </div>
     <!-- ends Get checksum for video/audio stream -->
 
+    <!-- Get checksum for all video/audio streams -->
+    <label class="recipe" for="get_streamhash">Get individual checksums for all video/audio streams ("Streamhash")</label>
+    <input type="checkbox" id="get_streamhash">
+    <div class="hiding">
+      <h5>Get individual checksums for all video/audio streams ("Streamhash")</h5>
+      <p><code>ffmpeg -i <em>input_file</em> -map 0 -f streamhash -hash md5 - -v quiet</code></p>
+      <p>
+      The outcome is very similar to that of "-f hash", except you get one hash
+      per-stream, instead of one (summary) hash.  Another benefit is that you
+      don't have to know which streams, or how many to expect in the source
+      file. This is very handy for hashing mixed born-digital material.
+      </p>
+      <p>
+      This script will perform a fixity check on all audio and video streams in
+      the file and return one hashcode for each one.  This is useful for e.g.
+      be able to change to container/codec format later on and validate it
+      matches the original source.
+      </p>
+      <p>
+      The output is formatted for easily processing it further in any kind of
+      programming/scripting language.
+      </p>
+      <dl>
+        <dt>ffmpeg</dt><dd>starts the command</dd>
+        <dt>-i <em>input_file</em></dt><dd>path, name and extension of the input file</dd>
+        <dt>-map 0</dt><dd>map ALL streams from input file to output. If you omit this, ffmpeg chooses only the first "best" (*) stream: 1 for audio, 1 for video (not all streams).</dd>
+        <dt>-f streamhash -hash md5</dt><dd>produce a checksum hash per-stream, and set the hash algorithm to md5. See the official <a href="https://www.ffmpeg.org/ffmpeg-formats.html#streamhash-1" target="_blank">documentation on streamhash</a> for other algorithms and more details.</dd>
+        <dt>-</dt><dd>FFmpeg syntax requires a specified output, and <code>-</code> is just a place holder. No file is actually created. Choose an output filename to write the hashcode lines into a textfile.</dd>
+        <dt>-v quiet</dt><dd>(Optional) Disables FFmpeg's processing output. With this option it's easier to see the text output of the hashes.</dd>
+      </dl>
+      <p>
+      The output looks like this, for example (1 video, 2 audio streams):
+      <code>
+      0,v,MD5=89bed8031048d985b48550b6b4cb171c
+      0,a,MD5=36daadb543b63610f63f9dcff11680fb
+      1,a,MD5=f21269116a847f887710cfc67ecc3e6e
+      </code>
+      <p class="link"></p>
+    </div>
+    <!-- ends Get checksum for all video/audio streams -->
+
     <!-- QCTools Report -->
     <label class="recipe" for="qctools">QCTools report (with audio)</label>
     <input type="checkbox" id="qctools">