Recherche avancée

Sur d’autres sites (13851)

• avcodec/proresenc_anatoliy : Mark impossible case as unreachable

  3 octobre 2021, par Andreas Rheinhardt

  avcodec/proresenc_anatoliy : Mark impossible case as unreachable
  Alternative fix for fix Coverity issue 1440385 (instead of
  
  6106177ad66ab28f44520534f386239d2405eeab).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/proresenc_anatoliy.c

• Issue with ffmpeg command : Copying video and audio streams

  27 juillet 2023, par sadra hoseini

  I am trying to use ffmpeg to copy both the video and audio streams from an input file to an output file without any re-encoding. I have used the following command :

  


  ffmpeg -i "file.mp4" -c:v copy -c:a copy "Path.mp4"


  


  However, I'm encountering an issue, and the command doesn't seem to work as expected. The output file is not being generated or the process terminates with an error. I've checked that "file.mp4" exists, and "Path.mp4" is the intended output path.

  


  Could someone please help me identify what might be causing this problem ? Are there any common pitfalls with the -c:v copy and -c:a copy options that I should be aware of ? If there are any alternative approaches to copy both video and audio streams without re-encoding, I'd appreciate learning about those as well.

  


  Thank you for your assistance !

  


• 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.