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• ffmpeg Output file #0 does not contain any stream when trying to access 1 of 2 audio streams

  7 juillet 2019, par nulltorpedo

  ffmpeg -i input.mkv  -map 0:2 -c copy -strict -2  audio.mkv

  Hi I have the above command. The output shows that there are 2 audio streams. I want to copy just the ac3 audio (actually I want to convert it but even this copy does not work). I have truncated the output print where there is metadata

  NEW updated sample with full log which results in same message

  ffmpeg -i input.mka -map 0:0 -c:a libfdk_aac   aac_out.m4a
  
  ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.3 (crosstool-NG 1.20.0) 20150311 (prerelease)
  
    configuration: --prefix=/usr --incdir='${prefix}/include/ffmpeg' --arch=i686 --target-os=linux --cross-prefix=/usr/local/x86_64-pc-linux-gnu/bin/x86_64-pc-linux-gnu- --enable-cross-compile --enable-optimizations --enable-pic --enable-gpl --enable-shared --disable-static --enable-version3 --enable-nonfree --enable-libfaac --enable-encoders --enable-pthreads --disable-bzlib --disable-protocol=rtp --disable-muxer=image2 --disable-muxer=image2pipe --disable-swscale-alpha --disable-ffserver --disable-ffplay --disable-devices --disable-bzlib --disable-altivec --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --disable-vaapi --disable-decoder=amrnb --disable-decoder=ac3 --disable-decoder=ac3_fixed --disable-encoder=zmbv --disable-encoder=dca --disable-encoder=ac3 --disable-encoder=ac3_fixed --disable-encoder=eac3 --disable-decoder=dca --disable-decoder=eac3 --disable-decoder=truehd --cc=/usr/local/x86_64-pc-linux-gnu/bin/x86_64-pc-linux-gnu-ccache-gcc --enable-yasm --enable-libx264 --enable-encoder=libx264
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, matroska,webm, from '/volume1/..../input.mka':
  
    Metadata:
  
      encoder         : libebml v1.3.9 + libmatroska v1.5.2
  
      creation_time   : 2019-07-07 06:19:20
  
    Duration: 02:29:21.98, start: 0.000000, bitrate: 640 kb/s
  
      Stream #0:0(eng): Audio: ac3, 48000 Hz, 5.1(side), 640 kb/s
  
      Metadata:
  
        BPS-eng         : 640000
  
        DURATION-eng    : 02:29:21.984000480
  
        NUMBER_OF_FRAMES-eng: 280062
  
        NUMBER_OF_BYTES-eng: 716958720
  
        _STATISTICS_WRITING_APP-eng: mkvmerge v35.0.0 ('All The Love In The World') 64-bit
  
        _STATISTICS_WRITING_DATE_UTC-eng: 2019-07-07 06:19:20
  
        _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
  Output #0, ipod, to 'aac_out.m4a':
  
    Metadata:
  
      encoder         : libebml v1.3.9 + libmatroska v1.5.2
  
  Output file #0 does not contain any stream

• lavfi/dnn : Async Support for TensorFlow Backend

  8 août 2021, par Shubhanshu Saxena

  lavfi/dnn : Async Support for TensorFlow Backend
  This commit enables async execution in the TensorFlow backend
  
  and adds function to flush extra frames.
  The async execution mechanism executes the TFInferRequests on
  
  a separate thread which is joined before the next execution of
  
  same TFRequestItem/while freeing the model.
  The following is the comparison of this mechanism with the existing
  
  sync mechanism on TensorFlow C API 2.5 CPU variant.
  Async Mode : 4m32.846s
  
  Sync Mode : 5m17.582s
  The above was performed on super resolution filter using SRCNN model.
  Signed-off-by : Shubhanshu Saxena <shubhanshu.e01@gmail.com>
  

  • [DH] libavfilter/dnn/dnn_backend_tf.c
  • [DH] libavfilter/dnn/dnn_backend_tf.h
  • [DH] libavfilter/dnn/dnn_interface.c

• Python video player using ffpyplayer.player with audio repeated cracking at end of clip

  18 janvier 2021, par sunyaer

  I am using the codes below to do a video player. For video clips cut using this command : "ffmpeg -i PrideAndPrejudice.mp4 -ss 00:50:31 -t 00:03:30 OutPutPP.mp4", there is audio crack that keeps repeating a couple of times when the picture stops at the end of the video. I suspect there may be some issues with the codes of QTimer, but as I am quite new to Python and ffmpeg, and can't figure out what exactly the problem is, not to mention how to fix it. Your help would be greatly appreciated.

  


      self.timer = QTimer()
    self.timer.setInterval(50)
    self.timer.start()
    self.timer.timeout.connect(self.showFrame)


  


  This is the whole codes :

  


   from ffpyplayer.player import MediaPlayer
 import sys
 from PyQt5.QtWidgets import *
 from PyQt5.QtGui import QPixmap, QImage, QImageReader
 from PyQt5.QtCore import QTimer

class MyApp(QWidget):
    def __init__(self, name, parent=None):
        super(MyApp, self).__init__(parent)
        self.label = QLabel()
        self.qimg = QImage()
        self.val = ''

        self.player = MediaPlayer("PrideAndPrejudice005030.mp4")
        self.timer = QTimer()
        self.timer.setInterval(50)
        self.timer.start()
        self.timer.timeout.connect(self.showFrame)

        layout = QVBoxLayout()
        layout.addWidget(self.label)
        self.setLayout(layout)
        self.setWindowTitle(name)

        # self.showFullScreen()

    def showFrame(self):
        frame, self.val = self.player.get_frame()
        if frame is not None:
            img, t = frame
            self.qimg = QImage(bytes(img.to_bytearray()[0]), img.get_size()[0], img.get_size()[1],
                               QImage.Format_RGB888)
            self.label.setPixmap(QPixmap.fromImage(self.qimg))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    t = MyApp(sys.argv[0])
    t.show()
    sys.exit(app.exec_())