Okay, so I've refactored those except WindowsError blocks into calls to a function and fixed the os.devnull bug, but I still can't get the triple chain working. I added calls to ffmpeg_proc.stdout.close() and sox_proc.stdout.close(), but I really am not sure where to put them. The following code works if SoX isn't part of the chain (that is, if vol == 1), but not otherwise (the Nero encoder says "truncation error" after it finishes; the same error I get if omit the close() calls): > while True: > if queue[position].audio: > if queue[position].vol != 1: > queue[position].ffmpeg_cmd = [ > queue[position].ffmpeg_exe, > '-i', queue[position].ifile, > '-f', 'sox', '-' > ] > queue[position].sox_cmd = [ > queue[position].sox_exe, > '-t', 'sox', '-', > '-t', 'wav', '-', > 'vol', str(queue[position].vol) > ] > else: > queue[position].ffmpeg_cmd = [ > queue[position].ffmpeg_exe, > '-i', queue[position].ifile, > '-f', 'wav', '-' > ] > queue[position].nero_aac_cmd = [ > queue[position].nero_aac_exe, > '-ignorelength', > '-q', str(queue[position].aac_quality), > '-if', '-', > '-of', queue[position].outdir + queue[position].prefix + '.m4a' > ] > print(queue[position].ffmpeg_cmd) > print(queue[position].sox_cmd) > print(queue[position].nero_aac_cmd) > try: > ffmpeg_proc = subprocess.Popen(queue[position].ffmpeg_cmd, > stdout=subprocess.PIPE, stderr=open(os.devnull, 'w')) > except WindowsError as exc: > log_windows_error(exc, queue[position].ffmpeg_cmd, 'critical') > break > if queue[position].vol != 1: > try: > sox_proc = subprocess.Popen(queue[position].sox_cmd, > stdin=ffmpeg_proc.stdout, stdout=subprocess.PIPE, > stderr=open(os.devnull, 'w')) > wav_pipe = sox_proc.stdout > except WindowsError as exc: > log_windows_error(exc, queue[position].sox_cmd, 'critical') > break > else: > wav_pipe = ffmpeg_proc.stdout > try: > nero_aac_proc = subprocess.Popen(queue[position].nero_aac_cmd, > stdin=wav_pipe) > except WindowsError as exc: > log_windows_error(exc, queue[position].nero_aac_cmd, 'critical') > break > finally: > ffmpeg_proc.stdout.close() > if queue[position].vol != 1: > sox_proc.stdout.close() > ffmpeg_proc.wait() > if queue[position].vol != 1: > sox_proc.wait() > nero_aac_proc.wait() > break
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