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• ffmpeg does not recognize long string filter in execv

  4 mai 2023, par incertia

  I am writing some simple python script to call ffmpeg and concat some clips together. However, it doesn't work for reasons I am unable to explain.

  


  below is a working version of the code after some debugging

  


  inputs = sorted(list(askopenfilenames()))
n = len(inputs)

filter = []
for i in range(n):
    filter.append("[{}:v]".format(i))
    filter.append("[{}:a]".format(i))
filter.append("concat={}:v=1:a=1".format(n))
filter.append("[v]")
filter.append("[a]")
filter = " ".join(filter)

fargs = zip(itertools.repeat('-i'), inputs)
fargs = itertools.chain(
    ["ffmpeg"],
    itertools.chain.from_iterable(fargs),
    ["-filter_complex", '"{}"'.format(filter), "-vsync", "vfr", "-map", "[v]", "-map", "[a]"],
    ["-c:v", "libx264", "-crf", "{}".format(quality)],
    ["-c:a", "aac", "-b:a", "192k"],
    [out]
    )

os.execvp("ffmpeg", list(fargs))


  


  but the entire fargs construction causes ffmpeg to complain about the filter chain when quotes are not utilized. e.g. by utilizing the below process

  


  fargs = itertools.chain(
    ["ffmpeg", "-loglevel", "debug"],
    itertools.chain.from_iterable(fargs),
    #["-filter_complex", '"{}"'.format(filter), "-vsync", "vfr", "-map", "[v]", "-map", "[a]"],
    ["-filter_complex", filter, "-vsync", "vfr", "-map", "[v]", "-map", "[a]"],
    ["-c:v", "libx264", "-crf", "{}".format(quality)],
    ["-c:a", "aac", "-b:a", "192k"],
    [out]
    )


  


  we see that ffmpeg somehow sees this as multiple arguments

  


  Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '[0:v]'.
Reading option '[0:a]' ... matched as output url.
Reading option '[1:v]' ... matched as output url.
Reading option '[1:a]' ... matched as output url.
Reading option '[2:v]' ... matched as output url.
Reading option '[2:a]' ... matched as output url.
Reading option 'concat=3:v=1:a=1' ... matched as output url.
Reading option '[v]' ... matched as output url.
Reading option '[a]' ... matched as output url.


  


  even though a simple print(list(fargs)) yields

  


  ['ffmpeg', '-loglevel', 'debug', '-i', 'a.mp4', '-i', 'b.mp4', '-i', 'c.mp4', '-filter_complex', '[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] concat=3:v=1:a=1 [v] [a]', '-vsync', 'vfr', '-map', '[v]', '-map', '[a]', '-c:v', 'libx264', '-crf', '20', '-c:a', 'aac', '-b:a', '192k', 'asdf.mp4']


  


  implying that the long filter string is being passed to ffmpeg as a single argument.

  


• lavfi/vf_vpp_qsv : check output format string against NULL pointer

  9 janvier 2023, par Haihao Xiang

  lavfi/vf_vpp_qsv : check output format string against NULL pointer
  This is in preparation for reusing the code for other QSV filters. E.g.
  
  deinterlacing_qsv may have an option array without format option
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavfilter/vf_vpp_qsv.c

• What is the most efficient way to convert wav audio string to an ogg file without writing it to disk ?

  1er janvier 2023, par Saurabh Kumar Karn

  My final objective is to use TTS to get some Indic text converted into audio and pass that audio to a messaging system that accepts mp3 and ogg. Ogg is preferred.

  


  I am on Ubuntu and my flow for getting audio string is something like this.

  


  

  1. Text in Indic language is passed to an API

  


  2. API returns a json with a key value called audioContent. audioString = response.json()['audio'][0]['audioContent']

  


  3. The decoded string is arrived by using this decode_string = base64.b64decode(dat)

  


  


  I am currently converting it to mp3 and as you can see I am writing the wave file first and then converting it into an mp3.

  


  wav_file = open("output.wav", "wb")
decode_string = base64.b64decode(audioString)
wav_file.write(decode_string)

# Convert this to mp3 file
print('mp3file')
song = AudioSegment.from_wav("output.wav")
song.export("temp.mp3", format="mp3")


  


  Is there a way to convert audioString directly to ogg file without doing the io ?

  


  I've tried torchaudio and pyffmpeg to load audioString and do the conversion but it doesn't seem to be working.