feat: 压缩前后体积对比

顺便也分离文件名冲突处理逻辑

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Python Debugger: Current File with Arguments",
+            "type": "debugpy",
+            "request": "launch",
+            "program": "${file}",
+            "console": "integratedTerminal",
+            "args": "${command:pickArgs}"
+        }
+    ]
+}

cmps_hevc_crf18.py

@@ -46,70 +46,79 @@ def get_duration(file_path: Path):
         raise
 
 
-def read_progress(ostream_line, dur, pbar):
-    if not ostream_line.startswith("out_time_ms="):
+def set_progress(line: str, dur, pbar):
+    if not line.startswith("out_time_ms="):
         return
     try:
-        us = int(ostream_line.split('=')[1])
+        us = int(line.split('=')[1])
         if us < 0:
             return
-        secs = us / 1_000_000
-        if secs > dur * 1.1:  # Allow 10% overshoot
-            pbar.n = dur
-        else:
-            pbar.n = secs
+        current_sec = us / 1_000_000
+        pbar.n = min(current_sec, dur)
         pbar.refresh()
-    except (ValueError, OverflowError):
-        pass
+    except (ValueError, IndexError, OverflowError):
+        return
+
+
+def start_ffmpeg(infile: Path, outfile: Path):
+    cmd = [
+        "ffmpeg", "-y", "-i", str(infile),
+        "-progress", "pipe:1", "-nostats", "-loglevel", "error",
+        *COMPRESS_OPTIONS, str(outfile)
+    ]
+    return subprocess.Popen(
+        cmd,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.STDOUT,
+        bufsize=1,
+        text=True,
+        encoding='utf-8')
+
+
+def clean_on_failure(proc: subprocess.Popen, outfile: Path):
+    if proc.poll() is None:
+        proc.kill()
+        proc.wait()
+    if outfile.exists():
+        try:
+            outfile.unlink()
+        except OSError:
+            pass
 
 
 def hevc_encode(infile: Path, outfile: Path, progress: bool = True):
-    # too heavy bro.
     dur = get_duration(infile)
-    cmd = [
-        "ffmpeg", "-y", "-i", str(infile),
-        "-progress", "pipe:1", "-nostats",
-        *COMPRESS_OPTIONS, str(outfile)
-    ]
     logger.debug(f"Duration: {dur:.2f} seconds")
-    logger.debug(f"Command: {' '.join(cmd)}")
-    proc = subprocess.Popen(
-        cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
-        text=True, encoding='utf-8', bufsize=1)
-    progress = progress and is_tty()
-    pbar = None if not progress else get_progress_bar(
+    proc = start_ffmpeg(infile, outfile)
+    logger.debug(f"Command: {proc.args}")
+
+    pbar = get_progress_bar(
         total=dur, unit='s',
-        bar_format='{l_bar}{bar}| {n:.2f}/{total:.2f}({unit})')
+        bar_format='{l_bar}{bar}| {n:.2f}/{total:.2f}({unit})'
+    ) if progress and is_tty() else None
+
     try:
-        while True:
-            line = proc.stdout.readline()
-            if not line and proc.poll() is not None:
+        for line in iter(proc.stdout.readline, ''):
+            set_progress(line.strip(), dur, pbar)
+            if proc.poll() is not None:
                 break
-            if not pbar:
-                continue
-            read_progress(line.strip(), dur, pbar)
+
         proc.wait()
         if proc.returncode != 0:
-            raise subprocess.CalledProcessError(proc.returncode, cmd)
+            raise subprocess.CalledProcessError(proc.returncode, "ffmpeg")
     except (
         KeyboardInterrupt,
         subprocess.CalledProcessError
     ) as e:
-        if proc.poll() is None:
-            proc.kill()
-            proc.wait()
         logger.error(
             f"Encoding failed with code {proc.returncode}:"
             f" {e.__class__.__name__}")
-        if outfile.exists():
-            try:
-                outfile.unlink()
-            except OSError:
-                pass
+        clean_on_failure(proc, outfile)
         raise
     finally:
         if pbar:
             pbar.close()
+        proc.stdout.close()
 
 
 def build_file_list(srcdir, extensions):
@@ -131,6 +140,23 @@ def make_output_path(infile: Path, outdir: Path = None, relroot: str = None):
     return outdir / rel_path
 
 
+def resolve_output(infile: Path, outfile: Path, rm_original: bool = False):
+    final_out = outfile.with_name(
+        outfile.name.replace(".hevc.mp4", ".mp4"))
+    is_path_conflict = final_out.resolve() == infile.resolve()
+    if is_path_conflict:
+        logger.warning(
+            f"Filename conflict!\n  i: {infile}\n  o: {final_out}")
+        if not rm_original:
+            logger.debug("Renaming original to avoid conflict.")
+            infile.rename(infile.with_stem(infile.stem + '.bak'))
+    logger.debug(f"Output file: {final_out}")
+    outfile.replace(final_out)
+    if rm_original and not is_path_conflict:
+        logger.debug(f"Remove original: {infile}")
+        infile.unlink()
+
+
 def parse_args():
     parser = argparse.ArgumentParser(
         prog=itsme,
@@ -176,7 +202,8 @@ def main():
         errmsg = 'No input files provided'
     if not files:
         raise SystemExit(errmsg)
-    files.sort(key=lambda x: x.stat().st_size)
+    if len(files) > 1:
+        files.sort(key=lambda x: x.stat().st_size)
 
     for idx, infile in enumerate(files, 1):
         logger.info(f"[{idx}/{len(files)}] {infile.name}")
@@ -189,21 +216,13 @@ def main():
         except (OSError, PermissionError) as e:
             logger.error(f"Job failed: {e}")
             raise
-        final_out = outfile.with_name(
-            outfile.name.replace(".hevc.mp4", ".mp4"))
-        if final_out.resolve() == infile.resolve():
-            logger.warning(
-                f"Filename conflict!\n  i: {infile}\n  o: {final_out}")
-            if not args.remove_original:
-                logger.debug("renaming original to avoid conflict.")
-                infile.rename(infile.with_stem(infile.stem + '.bak'))
-            outfile.replace(final_out)
-        else:
-            outfile.replace(final_out)
-            if args.remove_original:
-                logger.debug(f"Remove original: {infile}")
-                infile.unlink()
-        logger.debug(f"Output file: {final_out}")
+
+        isize = infile.stat().st_size / (1024 * 1024)
+        osize = outfile.stat().st_size / (1024 * 1024)
+        logger.info(f"Size deductions: {osize - isize:+.2f} MB")
+        logger.debug(f"  i: {isize:.2f} MB -> o: {osize:.2f} MB")
+
+        resolve_output(infile, outfile, args.remove_original)
 
 
 if __name__ == '__main__':