update linux run_command to give more output when stderrs out

linux.py

@@ -4,11 +4,10 @@ import shlex
 import subprocess
 
 def run_command(cmd_str: str, progress_prefix: str = "Progress", look_for: list = ["frame=", "time=", "fps=", "Rendering frame"]) -> bool:
-   """Runs a system command and streams its output live to the console."""
-   # shlex safely handles quotes and paths inside the command string
+   """Runs a system command, streams its output live, and reports errors on failure."""
    args = shlex.split(cmd_str)
 
-   # Redirect stderr to stdout because FFmpeg outputs status updates to stderr
+   # Redirect stderr to stdout to catch all logging/progress in one stream
    process = subprocess.Popen(
         args,
         stdout=subprocess.PIPE,
@@ -18,6 +17,9 @@ def run_command(cmd_str: str, progress_prefix: str = "Progress", look_for: list
     )
    print(f"Executing: {cmd_str[:90]}...")
 
+   # Maintain a small buffer history to display context if a crash occurs
+   output_history = []
+
    # Stream the output live to the terminal
    while True:
         line = process.stdout.readline()
@@ -25,6 +27,12 @@ def run_command(cmd_str: str, progress_prefix: str = "Progress", look_for: list
             break
         if line:
             clean_line = line.strip()
+            output_history.append(clean_line) # Keep history for error reporting
+            
+            # Keep history slim by only keeping the last 20 lines
+            if len(output_history) > 20:
+                output_history.pop(0)
+
             # Only print updates that show progress metrics to keep terminal clean
             if any(metric in clean_line for metric in look_for):
                 sys.stdout.write(f"\r[{progress_prefix}] {clean_line}")
@@ -33,4 +41,16 @@ def run_command(cmd_str: str, progress_prefix: str = "Progress", look_for: list
                 print(f"\n[Alert] {clean_line}")
             
    print("\n") # New line after process finishes
-   return process.returncode == 0
+   
+   # Evaluate success status
+   success = (process.returncode == 0)
+   
+   if not success:
+       print(f"❌ Command failed with exit code: {process.returncode}")
+       print("--- Technical Error Details (Last 5 lines of output) ---")
+       # Print the last 5 captured lines to show the exact point of failure
+       for error_line in output_history[-5:]:
+           print(f"  > {error_line}")
+       print("---------------------------------------------------------")
+
+   return success