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--- doc:appunti:linux:video:olive_editor_ovexml [2023/09/28 16:45] – niccolo
+++ doc:appunti:linux:video:olive_editor_ovexml [2023/09/28 18:03] (current) – [Proof of concept program] niccolo
@@ Line 2: / Line 2: @@
 **[[https://www.olivevideoeditor.org/|Olive Video Editor]]** is the most open video editor in the world. From its completely configurable render pipeline to its open source codebase, every aspect of it is designed to provide users with as much control as possible over both their work and their workflow.
+===== The project can be saved as an XML file =====
 A feature that I really apreciated is the ability to save the project file into an XML file (with the **.ovexml** extension). Being addicted to the **GNU/Linux command** line and **ffmpeg** I immediately tried to convert an Olive project into an ffmpeg script.
+===== A walk inside the OVEXML =====
 Here I explain some findings on an **OVEXML** file created with **Olive v.0.2**.
@@ Line 51: / Line 55: @@
 </code>
-As you can see the frame numbers are represented as rationales. Being my framerate 29.97 (i.e. 30000/1001) the math is as follow **1001 / 200 * 30000 / 1001 = 150** (i.e. 150 frames clip length). Beare to perform always the multiplication before the divisions, so that you surely get a whole number, without approximation.
+As you can see the frame numbers are represented as rational numbers. Being my footages shot at 29.97 FPS (i.e. 30000/1001) the math is as follow: **1001 / 200 * 30000 / 1001 = 150** (i.e. 150 frames clip length). Beware to perform always the multiplications before the divisions, so that you surely get a whole number, without approximation.
 The most challenging part was to understand how the clips are ordered into the timeline. Unfortunately the **%%<content>%%** nodes into the track are listed rougly in the order they are added to the project, the order does not correspond to the timeline order.
@@ Line 68: / Line 72: @@
 </code>
-The ASCII string **%%AwAAAAgAAAAFAAAABwAAAAYAAAA=%%** is actually a base64 encoded binary string that you can decode on the command line into binary:
+The ASCII string **%%AwAAAAgAAAAFAAAABwAAAAYAAAA=%%** is actually a base64 encoded binary string that you can decode on the command line into a binary file:
 <code bash>
@@ Line 81: / Line 85: @@
 Hence the timeline sequence of clip elements: #3, #8, #5, #7 and #6 (32 bit unsigned integers, little endian).
+===== Proof of concept program =====
+Here you can find my Python script that I used to parse an Olive Editor project file, the output is the ordered list of all the clips used, with the **footage filename**, the **start frame** and the **length** of the clip (in frames).
+**{{.:olive:olive-ovexml-list-clips-in-project.py.txt|olive-ovexml-list-clips-in-project.py}}**