主动判断是否有音频

biz/ffmpeg.py

@@ -45,7 +45,6 @@ def parse_ffmpeg_task(task_info, template_info):
         output_file = "out_" + str(time.time()) + ".mp4"
         task = FfmpegTask(tasks, output_file=output_file)
         overall = template_info.get("overall_template")
-        task.mute = False
         task.center_cut = template_info.get("crop_mode", None)
         task.frame_rate = template_info.get("frame_rate", 25)
         if overall.get('source', ''):

entity/ffmpeg.py

@@ -167,6 +167,7 @@ class FfmpegTask(object):
                 output_args.append("1")
             video_output_str = "[0:v]"
             audio_output_str = ""
+            audio_track_index = 0
             effect_index = 0
             for input_file in self.input_file:
                 input_args.append("-i")
@@ -242,19 +243,18 @@ class FfmpegTask(object):
                 input_index = input_args.count("-i")
                 input_args += MUTE_AUDIO_INPUT
                 filter_args.append(f"[{input_index}:a]acopy[a]")
+                audio_track_index += 1
                 audio_output_str = "[a]"
             else:
                 audio_output_str = "[0:a]"
+                audio_track_index += 1
             for audio in self.audios:
                 input_index = input_args.count("-i")
                 input_args.append("-i")
                 input_args.append(audio.replace("\\", "/"))
-                if audio_output_str == "":
+                audio_track_index += 1
-                    filter_args.append(f"[{input_index}:a]acopy[a]")
+                filter_args.append(f"{audio_output_str}[{input_index}:a]amix[a]")
-                    audio_output_str = "[a]"
+                audio_output_str = "[a]"
-                else:
-                    filter_args.append(f"{audio_output_str}[{input_index}:a]amix[a]")
-                    audio_output_str = "[a]"
             if audio_output_str:
                 output_args.append("-map")
                 output_args.append(audio_output_str)
@@ -276,6 +276,8 @@ class FfmpegTask(object):
                     elif isinstance(input_file, FfmpegTask):
                         f.write("file '" + input_file.get_output_file() + "'\n")
             input_args += ["-f", "concat", "-safe", "0", "-i", _tmp_file]
+            from util.ffmpeg import probe_video_audio
+            self.mute = not probe_video_audio(_tmp_file, "concat")
             output_args.append("-map")
             output_args.append("0:v")
             output_args.append("-c:v")

util/ffmpeg.py

@@ -16,8 +16,12 @@ def to_annexb(file):
         if not os.path.exists(file):
             return file
         logger.info("ToAnnexb: %s", file)
-        ffmpeg_process = subprocess.run(["ffmpeg", "-y", "-hide_banner", "-i", file, "-c", "copy", "-bsf:v", "h264_mp4toannexb",
+        ffmpeg_process = subprocess.run(["ffmpeg", "-y", "-hide_banner", "-i", file,
-                        "-f", "mpegts", file+".ts"])
+                                         "-f", "lavfi", "-i", "anullsrc=cl=stereo:r=48000",
+                                         "-map", "0:v", "-map", "1:a",
+                                         "-c:v", "copy", "-bsf:v", "h264_mp4toannexb",
+                                         "-c:a", "aac", "-b:a", "128k", "-ar", "48000", "-ac", "2",
+                                         "-f", "mpegts", file+".ts"])
         span.set_attribute("ffmpeg.args", json.dumps(ffmpeg_process.args))
         logger.info("ToAnnexb: %s, returned: %s", file, ffmpeg_process.returncode)
         span.set_attribute("ffmpeg.code", ffmpeg_process.returncode)
@@ -128,6 +132,27 @@ def probe_video_info(video_file):
         return int(width), int(height), float(duration)
 
 
+def probe_video_audio(video_file, type=None):
+    tracer = get_tracer(__name__)
+    with tracer.start_as_current_span("probe_video_audio") as span:
+        span.set_attribute("video.file", video_file)
+        args = ["ffprobe", "-hide_banner", "-v", "error", "-select_streams", "a", "-show_entries", "stream=index", "-of", "csv=p=0"]
+        if type == 'concat':
+            args.append("-safe")
+            args.append("0")
+            args.append("-f")
+            args.append("concat")
+        args.append(video_file)
+        result = subprocess.run(args, stderr=subprocess.STDOUT, **subprocess_args(True))
+        span.set_attribute("ffprobe.args", json.dumps(result.args))
+        span.set_attribute("ffprobe.code", result.returncode)
+        logger.info("probe_video_audio: %s", result.stdout.decode('utf-8').strip())
+        if result.returncode != 0:
+            return False
+        if result.stdout.decode('utf-8').strip() == '':
+            return False
+        return True
+
 # Create a set of arguments which make a ``subprocess.Popen`` (and
 # variants) call work with or without Pyinstaller, ``--noconsole`` or
 # not, on Windows and Linux. Typical use::