fix ffmpeg

xlib/ffmpeg/__init__.py

@@ -1 +1 @@
-from .ffmpeg import probe, run, run_play
+from .ffmpeg import probe, run

xlib/ffmpeg/ffmpeg.py

@@ -1,8 +1,8 @@
 import json
 import subprocess
+from typing import Union
 
-
-def run(args, pipe_stdin=False, pipe_stdout=False, pipe_stderr=False, quiet_std_err=False):
+def run(args, pipe_stdin=False, pipe_stdout=False, pipe_stderr=False, quiet_stderr=False) -> Union[subprocess.Popen,None]:
     """
     run ffmpeg process
 
@@ -10,11 +10,12 @@ def run(args, pipe_stdin=False, pipe_stdout=False, pipe_stderr=False, quiet_std_
     otherwise None
     """
     args = ['ffmpeg'] + args
+
     stdin_stream = subprocess.PIPE if pipe_stdin else None
     stdout_stream = subprocess.PIPE if pipe_stdout else None
     stderr_stream = subprocess.PIPE if pipe_stderr else None
 
-    if quiet_std_err and not pipe_stderr:
+    if quiet_stderr and not pipe_stderr:
         stderr_stream = subprocess.DEVNULL
 
     try:
@@ -53,20 +54,3 @@ def probe(filename):
         raise Exception('ffprobe', out, err)
     return json.loads(out.decode('utf-8'))
 
-
-def run_play():
-    args = ['ffplay',
-            '-f', 'rawvideo',
-            '-pix_fmt', 'bgr24',
-            '-s', '256x144',
-            '-'
-            ]
-    stdin_stream = subprocess.PIPE
-    stdout_stream = None
-    stderr_stream = None#subprocess.DEVNULL
-
-    try:
-        return subprocess.Popen(args, stdin=stdin_stream, stdout=stdout_stream, stderr=stderr_stream)
-    except Exception as e:
-        print('ffplay exception: ', e)
-    return None

xlib/io/IOThreadLinesReader.py

@@ -0,0 +1,56 @@
+import threading
+import time
+from io import IOBase
+from typing import List
+from collections import deque
+
+class IOThreadLinesReader:
+    """
+    continuously reads lines from IO in background thread.
+    """
+
+    def __init__(self, io : IOBase, max_lines=None):
+        self._io = io
+        self._lock = threading.Lock()
+        self._lines = deque(maxlen=max_lines)
+
+        threading.Thread(target=self._proc, daemon=True).start()
+
+    def _proc(self):
+        io = self._io
+        lock = self._lock
+        lines = self._lines
+
+        while not io.closed and io.readable():
+            line = io.readline()
+            lock.acquire()
+            lines.append(line.decode('utf-8').rstrip())
+            lock.release()
+            if len(line) == 0:
+                break
+            time.sleep(0.01)
+
+    def get_lines(self, wait_new=True, till_eof=False) -> List[str]:
+        """
+        """
+        lock = self._lock
+        lines = self._lines
+
+        result = []
+        while True:
+
+            if len(lines) != 0:
+                lock.acquire()
+                result += lines
+                lines.clear()
+                lock.release()
+
+                if till_eof and len(result[-1]) != 0:
+                    continue
+
+                return result
+
+            if not till_eof and not wait_new:
+                return None
+            time.sleep(0.001)
+

xlib/io/__init__.py

@@ -1 +1,2 @@
 from .IO import FormattedMemoryViewIO, FormattedFileIO
+from .IOThreadLinesReader import IOThreadLinesReader

xlib/player/VideoFilePlayer.py

@@ -3,10 +3,10 @@ from typing import Tuple
 
 import numpy as np
 from xlib import ffmpeg as lib_ffmpeg
+from xlib import io as lib_io
 
 from .FramePlayer import FramePlayer
 
-
 class VideoFilePlayer(FramePlayer):
     """
     Play video track from the video file using subprocess ffmpeg.
@@ -125,22 +125,23 @@ class VideoFilePlayer(FramePlayer):
                 '-map', f'0:v:{self._stream_idx}',
                 'pipe:']
 
-        self._ffmpeg_proc = lib_ffmpeg.run (args, pipe_stdout=True, pipe_stderr=True)
-        return self._ffmpeg_proc is not None
+        self._ffmpeg_proc = ffmpeg_proc = lib_ffmpeg.run (args, pipe_stdout=True, pipe_stderr=True)
+        self._ffmpeg_proc_stderr_lines = None
+        if ffmpeg_proc is not None:
+            self._ffmpeg_proc_stderr_lines = lib_io.IOThreadLinesReader(ffmpeg_proc.stderr, max_lines=5)
+            return True
+        return False
 
     def _ffmpeg_next_frame(self, frames_idx_offset=1):
         frame_buffer = None
 
         while frames_idx_offset != 0:
             frame_buffer = self._ffmpeg_proc.stdout.read(self._ffmpeg_height*self._ffmpeg_width*3)
+
             if len(frame_buffer) == 0:
-                err = self._ffmpeg_proc.stderr.read()
-                err_lines =  err.decode('utf-8').split('\r\n')
-                err = '\r\n'.join(err_lines[-5:])
-
-                # End reached
+                # unpredicted end reached
+                err = '\r\n'.join(self._ffmpeg_proc_stderr_lines.get_lines(till_eof=True)[-5:])
                 self._ffmpeg_stop()
-
                 return None, err
             frames_idx_offset -= 1