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• Python ffmpeg does not save the mp4 clips to file

  30 janvier 2021, par oo92

  I'm using the ffmpeg Python library to save 60 second mp4 clips to file from Twitch livestreams using its API. This is my code :

  


  current_dir = os.getcwd()

client = TwitchClient(client_id='')
streams_now = client.streams.get_live_streams(limit=100, offset=900)
epoch = str(math.ceil(time.time()))

if not os.path.exists(current_dir + '/twitch_videos/'):
    os.mkdir(current_dir + '/twitch_videos/')

for i in range(0, 1):
    try:
        username = streams_now[i]['channel']['name']
        id = streams_now[i]['id']
        game = streams_now[i]['game']
        game = game.translate(str.maketrans({':': '-', ' ': '-', "'": '', '!': '', '&': '_', '.': '', '+': '_'}))
        streaming = streamlink.streams('http://twitch.tv/' + username)
        stream = streaming["best"].url

        twitch_stream = ffmpeg.input(stream)

        twitch_stream = ffmpeg.filter(twitch_stream,
                                      'fps',
                                      fps=1,
                                      round='up')

        twitch_stream = ffmpeg.output(twitch_stream,
                                      current_dir + '/twitch_videos/' + '%d_' + username + '_' + epoch + '.mp4',
                                      sc_threshold='0',
                                      g='60',
                                      f='segment',
                                      segment_time='600',
                                      segment_format_options='movflags=+faststart',
                                      reset_timestamps='1')frl3dqgn21bbpp6tajjvg5pdevczac
        ffmpeg.run(twitch_stream)


    except:
        pass


  


  I am concatenating the path it should go to, to the name of the file. But the folder is empty after I take a look.

  


• How to convert mp3 data to wav data ?

  12 mai 2023, par Yali

  I have a wav audio file and i extracted data from that wav using python pydub module and i got this data

  


  [-139 18 -215 34 -196 6 -295 -31 -301 -35 -211 13 -93 47
-60 39 -58 7 -17 2]

  


  (this is first 10 data i got more than 1 million data)

  


  from pydub import AudioSegment
import numpy as np

song = AudioSegment.from_file("test.wav")
extract_data = np.array(song.get_array_of_samples())
print(extract_data[:10])


  


  then i converted wav to mp3 using that module and again extracted data from mp3 file and i got this data

  


  [-108 7 -193 24 -223 11 -239 -31 -248 -43 -203 -10 -101 23
-14 24 10 15 24 16]

  


  (this is first 10 data i got more than 1 million data)

  


  song = AudioSegment.from_file("test.wav")
song.export("test.mp3")
mp3_song = AudioSegment.from_file("test.mp3")
extract_data = np.array(mp3_song.get_array_of_samples())
print(extract_data[:10])


  


  and again i converted mp3 to wav now i got mp3 data instead of wav data.

  


  mp3_song = AudioSegment.from_file("test.mp3")
mp3_song.export("test1.wav", format="wav")

song = AudioSegment.from_file("test1.wav")
extract_data = np.array(song.get_array_of_samples())
print(extract_data[:10])


  


  My point is how to convert mp3 data to original wav data ?

  


  please help me,

  


  Thanks.

  


• How to save synthesized audio during streaming distribution

  7 avril 2022, par its-ogawa

  I would like to stream a composite of microphone audio and digital sound sources by ffmpeg and save the delivery to an m3u8 file.

  


  Below are the commands I have actually tried.

  


  ffmpeg -rtbufsize 100M -f dshow -i video=<my webcam="webcam">:audio=<my microphone="microphone"> -re -stream_loop -1 -i <my sound="sound" source="source"> -filter_complex "[0]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=2100|2100,volume@voice=volume=10dB[voice],[1]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,azmq,volume@bgm=volume=0.2[bgm],[voice][bgm]amerge=inputs=2[out]" -map 0:v -map [out]:a -f mpegts -flush_packets 0 udp://XXX.XXX.XXX.XXX:XXX?pkt_size=1316 -f hls -hls_time 5 hls.m3u8&#xA;</my></my></my>

  


  I have played an m3u8 created this way, but I cannot hear the digital sound source that I am supposed to have synthesized.
Even though the synthesized audio was audible when streamed.

  


  Perhaps you need to set up something like -map 0:v -map [out]:a when saving to the m3u8 file, in which case the Output with label 'out' does not exist in any defined filter graph, or was already used elsewhere. message appears and does not work.