# FFmpeg Execution + Progress


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### run_ffmpeg_with_progress

``` python

def run_ffmpeg_with_progress(
    cmd:List, # The ffmpeg command and arguments
    total_duration:Optional=None, # Total duration in seconds for a determinate bar, else indeterminate
    description:str='Processing', # Description text for the progress bar
    verbose:bool=False, # If True, prints detailed ffmpeg output
    progress_callback:Optional=None, # Optional callback receiving current progress in seconds
)->None: # Raises FileNotFoundError or subprocess.CalledProcessError on failure

```

*Run an ffmpeg command with a progress bar.*

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### parse_progress_line

``` python

def parse_progress_line(
    line:str, # A line of stderr output from ffmpeg
)->Optional: # Current time in seconds, or None if the line has no progress info

```

*Parse a progress line from ffmpeg stderr output.*

``` python
assert parse_progress_line("out_time_ms=1000000") == 1.0
assert parse_progress_line("time=00:00:02.50") == 2.5
assert parse_progress_line("frame=10") is None
assert parse_progress_line("garbage") is None
print("progress parsing OK")
```