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• FFMPEG mkv to mp4 conversion lacks audio

  28 septembre 2017, par Landslyde

  I used ffmpeg to convert an mkv file to mp4 using this command line :

  ffmpeg -i input.mkv -c copy file-1.mp4

  The resulting mp4 plays fine (video and audio) on Linux Mint's Xplayer. But after uploading file-1, it played with no audio. So I uploaded another mp4 file-2, one I didn’t have to convert, and it plays both video and audio without a problem. So whatever’s going on with file-1 seems to be with my use of ffmpeg.

  The player I’m using is called afterglow. But the HTML5 player handles these two files the same way : file-1 & file-2

  Does anyone know why the ffmpeg converted file is soundless when played online ? Is there a different conversion command that ensures converted mkv files will play with sound by online players ?

• Streaming Encoded MPEG-4 live video from a web camera using RTP in C++

  20 juin 2022, par Maad A.Galil

  I have been working on building a video streamer from a webcam using RTP protocol in C++ language in Linux. I was able to use opencv to take frames from the webcam and send them frame by frame to a client app that shows those frames one by one using the same frame per second parameter.

  


  But that is mostly a MJPEG kind of transfer as the encoding used is JPEG encoding with a specific quality for each frame. However, I would like to use MPEG-4 encoding before transferring the video. After a deep search online I found out that ffmpeg is the best for such purpose. But the samples online mostly work through a command line interface to capture a webcam video and save it as a video file with the given encoding and format.

  


  Is there a possibility to encode the webcam "LIVE", and get byte data while encoding the camera stream ?

  


  I would like to use those byte data to transfer it using RTP for example. And then I would like to decode the received byte data and show the video using opencv imshow function for example.

  


• How can I solve this error, file not found error

  11 août 2021, par Kapil Kumar

  from pydub import AudioSegment
sound = AudioSegment.from_mp3("F :\work\online internship\M1ML\Language_Recg\Test.mp3")
sound.export("F :\work\online internship\M1ML\Language_Recg\Test.wav", format="wav")

  


  C :\Users\hp\anaconda3\envs\Language_Recg\python.exe "F :/work/online internship/M1ML/Language_Recg/mp3_wav.py"
C :\Users\hp\anaconda3\envs\Language_Recg\lib\site-packages\pydub\utils.py:170 : RuntimeWarning : Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work
warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)
C :\Users\hp\anaconda3\envs\Language_Recg\lib\site-packages\pydub\utils.py:198 : RuntimeWarning : Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work
warn("Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work", RuntimeWarning)
Traceback (most recent call last) :
File "F :/work/online internship/M1ML/Language_Recg/mp3_wav.py", line 2, in 
sound = AudioSegment.from_mp3("F :\work\online internship\M1ML\Language_Recg\Test.mp3")
File "C :\Users\hp\anaconda3\envs\Language_Recg\lib\site-packages\pydub\audio_segment.py", line 796, in from_mp3
return cls.from_file(file, 'mp3', parameters=parameters)
File "C :\Users\hp\anaconda3\envs\Language_Recg\lib\site-packages\pydub\audio_segment.py", line 728, in from_file
info = mediainfo_json(orig_file, read_ahead_limit=read_ahead_limit)
File "C :\Users\hp\anaconda3\envs\Language_Recg\lib\site-packages\pydub\utils.py", line 274, in mediainfo_json
res = Popen(command, stdin=stdin_parameter, stdout=PIPE, stderr=PIPE)
File "C :\Users\hp\anaconda3\envs\Language_Recg\lib\subprocess.py", line 858, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File "C :\Users\hp\anaconda3\envs\Language_Recg\lib\subprocess.py", line 1311, in _execute_child
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError : [WinError 2] The system cannot find the file specified

  


  Process finished with exit code 1