synology-thumbgen/.specstory/history/2025-10-12_21-53Z-fix-thumbnail-generation-and-script-creation.md

Fix thumbnail generation and script creation (2025-10-12 21:53Z)

User (2025-10-12 21:53Z)

@2025-09-28_20-12Z-fixing-thumbnail-generation-and-sync-issues.md I have some more thumbs to generate in C:\Users\Nathan\SynologyDrive\YouTube\Streams\MixerTwitch\2025 let's do some things:

• disable funcitonality for webm since synology doesn't even support thumbnailing for it
• create a shell script that does the opposite of nascleanup.sh; it extracts the eadir@ to eadir_tmp so the thumbgen skips the existing frames instead of recalculating them again

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Assistant (gpt-5)

Thought Process

Clarifying user requests

I see the user has two tasks to tackle. First, they want to disable functionality for .webm files in the psthumbgen.py script, which handles thumbnail generation. This means we should modify the code to skip processing .webm files, possibly through a config or flag.

Then, they mentioned creating a shell script that does the opposite of nascleanup.sh, transferring eadir@ to eadir_tmp so that thumbgen doesn't recalculate existing frames. Since they confirmed the need for a script, we’ll proceed with that. Planning file modifications

I need to open and read the psthumbgen.py file to find where .webm processing is managed. I'll use a method like read_file and possibly grep. I also need to create a shell script that does the opposite of nascleanup.sh, so I'll read that script to understand its functionality.

Next, I'll use multi_tool_use.parallel to simultaneously read both scripts. Since this is a multi-step task, I'll create two tasks: one for disabling .webm processing and another for adding the shell script that extracts EAs to eadir_tmp. I'll mark the first task as in progress before moving forward.

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I’m going to scan psthumbgen.py to find where .webm handling is implemented, and read nascleanup.sh to mirror its logic for the new “extract eadir to eadir_tmp” script.

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Tool use: read_file

Read file: c:\Users\Nathan\Desktop\synology-thumbgen\psthumbgen.py

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Tool use: read_file

Read file: c:\Users\Nathan\Desktop\synology-thumbgen\nascleanup.sh

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Thought Process

Adjusting functionality for webm

I need to disable functionality for webm files since Synology doesn't support thumbnailing for them. This means I’ll likely have to modify psthumbgen.py to skip .webm files. Currently, webm is included in valid_exts, so I'll need to adjust it to stop processing them—maybe by excluding webm from valid_exts or modifying the process_file video condition. The user wants to avoid wasting time on unsupported thumbnails, so skipping .webm entirely makes sense. Updating file handling and creating script

I just need to make minimal changes: first, I’ll remove 'webm' from valid_exts and adjust the video checks to exclude it. I should also update the Icaros helper sets so they avoid looking up '.webm'. They had heuristics referencing webm, but it’s probably fine to keep those unaffected since they’re for mapping. To be thorough, I’ll make sure to remove it from supported lists to simplify logic.

Next, I need to create a shell script that does the opposite of nascleanup.sh. This new script should extract the @eaDir to eaDir_tmp, letting thumbgen skip existing frames instead of recalculating them. It suggests copying the @eaDir directories and renaming them as eaDir_tmp alongside the originals. Clarifying directory extraction

The instructions say to "extract the eadir@ to eadir_tmp." There’s a minor typo, using "eadir@" instead of "@eaDir," but looking back at nascleanup, we see they used '@eaDir.' For our task, we want to copy/replace '@eaDir' with 'eaDir_tmp'.

I need to be cautious, though, since an existing 'eaDir_tmp' could be there. My plan is to create a corresponding 'eaDir_tmp' directory for each '@eaDir' subdirectory found. So, for each '@eaDir', I’ll set up a sibling 'eaDir_tmp' directory, keeping the structure intact. This way, we wouldn't overwrite anything already on the NAS, effectively preserving existing data. Creating extraction script

The user mentioned that we want to create a way for thumbgen to skip existing frames instead of recalculating them. The generator verifies if thumbnails already exist in eaDir_tmp and, if they do, it skips generating those sizes. In the code, both create_video_thumbnails and generate_synology_thumbnails check for pre-existence.

So, if we copy the contents from @eaDir to eaDir_tmp, our psthumbgen.py will see those files in 'eaDir_tmp' and bypass generating them. I'll need to create a new shell script for this purpose—perhaps I'll name it extract_eadir_to_tmp.sh, with an input directory path like nascleanup.sh. Creating extraction script details

First, I need to modify the extract_from_icdb_database by removing '.webm' from the get_alphabetical_position icaros_extensions set. I’ll create a patch with four separate hunks afterward.

Then, I’ll compose the new script extract_eadir_to_tmp.sh with a bash shebang. The usage will be $0 <directory>, and I'll use find to locate directories named '@eaDir'. For each found directory, I’ll set up a temporary directory and copy contents from @eaDir to eaDir_tmp using rsync if available, or fallback to cp if not. I’ll make sure to keep the output messages concise, avoiding excessive comments. Finally, I'll run read_lints on psthumbgen.py and update the necessary items.

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I'll add todos for the two tasks, then disable .webm processing in psthumbgen.py, check for linter issues, and create the new extraction script that copies @eaDir to eaDir_tmp.

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Tool use: todo_write

Todo List

• [-] Disable .webm processing in psthumbgen.py
• Create extract_eadir_to_tmp.sh to copy @eaDir into eaDir_tmp

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I'll update psthumbgen.py to skip .webm files and then check for any linter errors.

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Tool use: read_file

Read file: c:\Users\Nathan\Desktop\synology-thumbgen\psthumbgen.py

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Thought Process

Evaluating webm functionality

I need to implement changes regarding webm functionality. The user mentioned that Synology doesn't support thumbnails for webm files, so I should disable processing for them. This means modifying the code to exclude .webm in the valid extensions list and in the file processing functions. If they’re not supported, generating thumbnails would just be a waste of effort. So, I’ll remove webm from valid_exts and associated lists in the code. Adjusting webm settings

I’m considering the processing of .webm in the Icaros helper sets. Although it’s included only for mapping, it’s clear that the user wants to disable functionality for webm entirely since Synology doesn’t support thumbnailing. So, I’ll modify the code to exclude .webm from valid_exts, process_file, and supported_exts to prevent any confusion or log spam if the function is mistakenly called. Even though it’s not critical, removing it will streamline things. Completing webm adjustments and scripting

I need to remove all occurrences of .webm in both find_files and process_file lists for thoroughness. I’ll also add disclaimers to comments about earlier tasks, but I'll keep it minimal. Then, I am tasked with creating a shell script that extracts '@eaDir' directories to 'eaDir_tmp' for thumbgen to skip existing frames. This script should replicate any existing '@eaDir/filename' into 'eaDir_tmp/filename'. I’m considering whether to copy those files or create symlinks instead. Clarifying file duplication process

On Synology Linux, when handling '@eaDir', I need to be careful not to lose thumbnail information. Since moving files could erase that data, making duplicates in 'eaDir_tmp' is a better approach by using copy instead of move. The copying process means retaining the original '@eaDir'.

I’ll need to copy the contents of '@eaDir/' into 'eaDir_tmp/' at the same directory level. This requires iterating through each '@eaDir' directory, creating sibling 'eaDir_tmp' folders if they don’t exist, and copying the contents accordingly. Implementing script and file edits

I want to invert the functionality of the existing nascleanup.sh to create a new script, extract_eadir_to_tmp.sh. This will find all '@eaDir' directories, create corresponding 'eaDir_tmp' folders, and copy the complete directory structure while preserving it. I’ll ensure that if thumbnails exist in 'eaDir_tmp', process_file will skip generating them again.

I also need to disable webm processing in psthumbgen.py and update valid_exts to remove '.webm'. While I need to keep comments minimal, I want to document the intentional exclusion of webm for clarity. Finally, I will apply the necessary changes and then run lints to ensure everything is correct.

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I'm updating the code to skip .webm files, then I'll create the new extract_eadir_to_tmp.sh script that copies @eaDir into eaDir_tmp to pre-seed thumbnails.

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Tool use: apply_patch

Apply patch for c:\Users\Nathan\Desktop\synology-thumbgen\psthumbgen.py

*** Begin Patch
*** Update File: c:\Users\Nathan\Desktop\synology-thumbgen\psthumbgen.py
@@
 def find_files(dir):
     # Only process formats that Synology doesn't handle well
     # Exclude common images (jpg, png, gif, etc.) since NAS handles them fine
-    valid_exts = ('mp4', 'webm', 'avi', 'mkv', 'mov', 'wmv', 'flv', 'm4v', 'ts',
+    valid_exts = ('mp4', 'avi', 'mkv', 'mov', 'wmv', 'flv', 'm4v', 'ts',
                   'psd', 'blend')
@@
-    if file_ext in ['.mp4', '.webm', '.avi', '.mkv', '.mov', '.wmv', '.flv', '.m4v', '.ts']:
+    if file_ext in ['.mp4', '.avi', '.mkv', '.mov', '.wmv', '.flv', '.m4v', '.ts']:
         create_video_thumbnails(file_path, thumb_dir)
*** End Patch

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I disabled .webm handling in psthumbgen.py. I'll mark that todo complete, then create a new shell script to copy @eaDir to eaDir_tmp recursively so thumbgen skips regenerating frames.

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Tool use: todo_write

Todo List

• Disable .webm processing in psthumbgen.py
• [-] Create extract_eadir_to_tmp.sh to copy @eaDir into eaDir_tmp

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Thought Process

Applying code changes

I’m planning to use apply_patch to add a new file while keeping in mind that comments should be minimal unless critical. A small header is okay, and I need to maintain indentation since it's a new file. The previous task disabled .webm, and I think skipping it in find_files and process_file should be enough. I'll run read_lints on psthumbgen.py after making changes and apply_patch to create the script. I’ll include status updates before tool calls throughout this process. Implementing user rules

I have two main actions: first, I’ll run read_lints, then create the file. While the order isn’t critical, I could run read_lints in parallel with nothing else, but starting with it seems more straightforward. The user's user_rules state that a script should only be generated if specified, and they did specify creating a shell script. I want to ensure the code remains concise and avoid heavy formatting. I’ll make changes using tools without directly outputting code, but I will provide a summary in my final message. Following instructions on code changes

Given that the environment uses code edit tools for file generation, the user will see it in the editor. The instructions specify that I should never output code to the user unless requested, and the user only asked to create a script, not to see the content. So I won’t print the script code. Now, I’ll focus on running read_lints and ensure everything is set up correctly before proceeding further!

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I'll run a quick linter check on psthumbgen.py, then create the new extract_eadir_to_tmp.sh script that mirrors @eaDir into eaDir_tmp with existing thumbnails so psthumbgen.py skips regenerating them.

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Tool use: read_lints

Read lints for 1 file

Lint paths:

• c:\Users\Nathan\Desktop\synology-thumbgen\psthumbgen.py

Lint results

Lint errors for psthumbgen.py

Message	Range	Severity
Import "ImageDraw" is not accessed	12:24-12:33	DIAGNOSTIC_SEVERITY_HINT
Import "ImageFont" is not accessed	12:35-12:44	DIAGNOSTIC_SEVERITY_HINT
Variable "dirs" is not accessed	84:15-84:19	DIAGNOSTIC_SEVERITY_HINT
Variable "all_streams" is not accessed	578:9-578:20	DIAGNOSTIC_SEVERITY_HINT
Import "sqlite3" is not accessed	676:16-676:23	DIAGNOSTIC_SEVERITY_HINT
Import "hashlib" is not accessed	677:16-677:23	DIAGNOSTIC_SEVERITY_HINT
Variable "drive" is not accessed	895:13-895:18	DIAGNOSTIC_SEVERITY_HINT
Variable "dnames" is not accessed	921:24-921:30	DIAGNOSTIC_SEVERITY_HINT
Import "struct" is not accessed	981:16-981:22	DIAGNOSTIC_SEVERITY_HINT
Import "glob" is not accessed	982:16-982:20	DIAGNOSTIC_SEVERITY_HINT
Import "re" is not accessed	983:16-983:18	DIAGNOSTIC_SEVERITY_HINT
Variable "dirs" is not accessed	1067:35-1067:39	DIAGNOSTIC_SEVERITY_HINT
"file_path" is not accessed	1212:44-1212:53	DIAGNOSTIC_SEVERITY_HINT

---

Thought Process

Creating shell script for Synology NAS

I need to develop a shell script that essentially reverses what nascleanup.sh does. This new script should copy contents from @eaDir to eaDir_tmp to allow thumbgen to skip recalculating existing frames. I see that we've already disabled webm in our Python code, which aligns with the initial requirements since Synology doesn't support thumbnailing for webm. The script should be in Bash and focus on ensuring that standard Synology thumbnail files are preserved in the eaDir_tmp path. Examining thumbnail directory structure

I need to look into how psthumbgen expects the thumb_dir to be structured. In process_file, thumb_dir is set to combine the base directory and filename under eaDir_tmp. So, for each file, the thumbnails should be in a specific path. We have to replicate the structure from @eaDir to eaDir_tmp. For each @eaDir directory, I’ll create a corresponding eaDir_tmp directory and copy over the necessary files, skipping any that already exist. The ultimate aim is to facilitate thumbgen in skipping existing thumbnail frames. I also need to ensure that permissions are set correctly on eaDir_tmp and create a script named extract_eadir_to_tmp.sh to accept the target directory path. Designing the extraction script

The script I'm conceptualizing shouldn’t stop services since it only involves read-only copying for extraction purposes. Although the NAS might restrict access, we can run it as a user. I’m outlining the script to be used like this: ./extract_eadir_to_tmp.sh /volume1/... or possibly a Windows path.

I need to validate the argument first, then look for any directories that contain @eaDir. For each of these directories, I’ll calculate the source and destination paths, ensuring the destination directory exists. I plan to copy relevant thumbnail files, specifically anything that matches SYNOPHOTO_THUMB_* and SYNOVIDEO_VIDEO_SCREENSHOT.jpg. To simplify, I think I’ll use the cp -n command to copy these files, mostly focusing on JPGs, since that's what Synology uses frequently. Refining the script with rsync

I realize I need to add the -n option to prevent overwriting any existing files during the copy process. I also have to be cautious about path names that might contain reserved characters. Using find with -print0 and reading with while read -d '' could simplify this.

Instead of basic copying, I think using rsync would be effective because it can maintain the directory structure while copying recursively. I’ll utilize options like --ignore-existing to skip files that are already there, and include the specific thumbnail patterns I need. However, I should note that mapping the source from @eaDir to the destination in eaDir_tmp might be tricky with rsync, and using --filter for transformations doesn’t seem straightforward. I’ll have to figure out a cleaner way to handle that. Looping through directories for extraction

I'm designing a script that will loop through the directories in @eaDir. The script starts by finding each @eaDir directory in the target location and then iterates through its entries, creating corresponding eaDir_tmp directories. For each known thumbnail file, I’ll check if it exists in the source directory and only copy it if the destination doesn't already have it.

After copying, I'll adjust permissions to make sure they are writable, as psthumbgen needs the destination directory to exist and be modifiable. I want to keep things simple by including a dry-run flag and respecting the user's request to generate this shell script. Once everything is structured properly, I'll apply the patch to add the new file and update the task list to complete.

---

I'll create a new extract_eadir_to_tmp.sh script that copies thumbnails from each @eaDir/<filename> into eaDir_tmp/<filename> without overwriting, so your Python thumbgen will skip regenerating existing images.

---

Tool use: apply_patch

Apply patch for c:\Users\Nathan\Desktop\synology-thumbgen\extract_eadir_to_tmp.sh

*** Begin Patch
*** Add File: c:\Users\Nathan\Desktop\synology-thumbgen\extract_eadir_to_tmp.sh
+#!/bin/bash
+
+# Extract existing Synology thumbnails from @eaDir into eaDir_tmp so thumbgen skips regeneration
+# Usage: ./extract_eadir_to_tmp.sh /volume1/YourShare/path
+
+set -euo pipefail
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <directory_path>"
+    exit 1
+fi
+
+TARGET_DIR="$1"
+
+if [ ! -d "$TARGET_DIR" ]; then
+    echo "Error: '$TARGET_DIR' is not a directory"
+    exit 1
+fi
+
+echo "=== Extracting @eaDir thumbnails to eaDir_tmp ==="
+echo "Target: $TARGET_DIR"
+
+# For every @eaDir/<name> directory, copy known thumbnail files to eaDir_tmp/<name>
+find "$TARGET_DIR" -type d -name '@eaDir' -print0 | while IFS= read -r -d '' EADIR; do
+    PARENT_DIR="$(dirname "$EADIR")"
+
+    # Each immediate subdir under @eaDir corresponds to a source filename
+    find "$EADIR" -mindepth 1 -maxdepth 1 -type d -print0 | while IFS= read -r -d '' ENTRY; do
+        BASENAME="$(basename "$ENTRY")"
+        DEST_DIR="$PARENT_DIR/eaDir_tmp/$BASENAME"
+
+        mkdir -p "$DEST_DIR"
+
+        # Copy without overwriting existing files in eaDir_tmp
+        for F in \
+            SYNOVIDEO_VIDEO_SCREENSHOT.jpg \
+            SYNOPHOTO_THUMB_XL.jpg \
+            SYNOPHOTO_THUMB_B.jpg \
+            SYNOPHOTO_THUMB_M.jpg \
+            SYNOPHOTO_THUMB_PREVIEW.jpg \
+            SYNOPHOTO_THUMB_S.jpg; do
+            if [ -f "$ENTRY/$F" ] && [ ! -f "$DEST_DIR/$F" ]; then
+                cp "$ENTRY/$F" "$DEST_DIR/$F"
+            fi
+        done
+    done
+done
+
+echo "=== Done. Existing thumbnails copied into eaDir_tmp where available. ==="
+
*** End Patch

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Tool use: todo_write

Todo List

• Disable .webm processing in psthumbgen.py
• Create extract_eadir_to_tmp.sh to copy @eaDir into eaDir_tmp

---

• I disabled .webm from processing in psthumbgen.py by removing it from valid_exts and from the video extensions check.
• I added extract_eadir_to_tmp.sh to mirror existing @eaDir thumbnails into eaDir_tmp without overwriting so psthumbgen.py skips regenerating.

Run:

# on the NAS
chmod +x extract_eadir_to_tmp.sh
./extract_eadir_to_tmp.sh "/volume1/Hydra/YouTube/Streams/MixerTwitch/2025"

# on Windows to generate
pwsh -NoProfile -File .\psthumbgen.py --directory "C:\Users\Nathan\SynologyDrive\YouTube\Streams\MixerTwitch\2025"

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