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• avcodec/amrwbdec : Mark default switch as unreachable

  3 octobre 2021, par Andreas Rheinhardt

  avcodec/amrwbdec : Mark default switch as unreachable
  Alternative fix for Coverity issue #1473499
  
  instead of a3bb269db92601e2dc0e99352468d02f7b26c7c2.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/amrwbdec.c

• how to copy mp4 file generated by FFMPEG spawn using another FFMPEG spawn

  2 mai 2021, par Abadi

  I am using the following code that records screen on Linux and the output is an mp4 file.

  


  const transcodeStreamToOutput = spawn('ffmpeg',[
'-hide_banner',
'-loglevel', 'error',
// disable interaction via stdin
'-nostdin',
// screen image size
'-s', `${BROWSER_SCREEN_WIDTH}x${BROWSER_SCREEN_HEIGHT}`,
// video frame rate
'-r', `${VIDEO_FRAMERATE}`,
// hides the mouse cursor from the resulting video
'-draw_mouse', '0',
// grab the x11 display as video input
'-f', 'x11grab',
    '-i', `${DISPLAY}`,
// grab pulse as audio input
'-f', 'pulse',
    '-ac', '2',
    '-i', 'default',
// codec video with libx264
'-c:v', 'libx264',
    '-pix_fmt', 'yuv420p',
    '-profile:v', 'main',
    '-preset', 'veryfast',
    '-x264opts', 'nal-hrd=cbr:no-scenecut',
    '-minrate', `${VIDEO_BITRATE}`,
    '-maxrate', `${VIDEO_BITRATE}`,
    '-g', `${VIDEO_GOP}`,
// apply a fixed delay to the audio stream in order to synchronize it with the video stream
'-filter_complex', 'adelay=delays=1000|1000',
// codec audio with aac
'-c:a', 'aac',
    '-b:a', `${AUDIO_BITRATE}`,
    '-ac', `${AUDIO_CHANNELS}`,
    '-ar', `${AUDIO_SAMPLERATE}`,
// adjust fragmentation to prevent seeking(resolve issue: muxer does not support non seekable output)
'-movflags', 'frag_keyframe+empty_moov',
// set output format to mp4 and output file to stdout
'-f', 'mp4', '-'
]


  


  ) ;

  


  I need to run ffmpeg -i captured.mp4 -c copy new.mp4 using another spawn process on the output.
I tried the following :

  


  const newStdOut =  spawn('ffmpeg',[

    '-i', `${transcodeStreamToOutput.stdout}`, 
    '-codec:v', 'copy', 
    '-codec:a', 'copy', 
    '-f', 'mp4', '-'
    ]
);


  


  But it is not working. I would appreciate any help.

  


• slowmotion and fastmotion using FFmpeg takes a long time

  22 novembre 2018, par Bhavik Nathani

  FFmpeg takes a long time in Video Processing Like Slowmotion, Fastmotion, Reverse Video, Compress Video e.t.c.

  Is there any solution to reduce the time taken in video processing or any alternative library for Video Processing like FFmpeg ? But it should be faster than FFmpeg.