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• ffmpeg output to file but overwrite (not append)

  17 novembre 2019, par omega1

  I need to get the real time audio level from a file and I’m using this to write the level to the file volume.txt

  ffmpeg -i file.mp4 -af astats=metadata=1:reset=10,ametadata=print:key=lavfi.astats.Overall.RMS_level -f null /dev/null 2> volume.txt

  This works, but it appends each value to the file like this which grows significantly :

  [Parsed_ametadata_1 @ 0x7fbae6209ac0] lavfi.astats.Overall.RMS_level=-22.294513
  
  [Parsed_ametadata_1 @ 0x7fbae6209ac0] frame:32   pts:36864   pts_time:0.835918
  
  [Parsed_ametadata_1 @ 0x7fbae6209ac0] lavfi.astats.Overall.RMS_level=-22.194567
  
  [Parsed_ametadata_1 @ 0x7fbae6209ac0] frame:33   pts:38016   pts_time:0.862041
  
  [Parsed_ametadata_1 @ 0x7fbae6209ac0] lavfi.astats.Overall.RMS_level=-22.197214

  But I need it to overwrite with just the current value like this :

  [Parsed_ametadata_1 @ 0x7fbae6209ac0] frame:33   pts:38016   pts_time:0.862041
  
  [Parsed_ametadata_1 @ 0x7fbae6209ac0] lavfi.astats.Overall.RMS_level=-22.197214

  How would I achieve this ?

  Thank you.

• 2023-04-18 18:25:05 INFO discord.player ffmpeg process ##### successfully terminated with return code of 0

  19 avril 2023, par I_am_thing

  I am making a discord music bot with discord.py and ctx, it uses Spotify

  


  I am using FFmpeg for my music feature. This is my !play code

  


  client_id = ''
client_secret = ''
client_credentials_manager = SpotifyClientCredentials(client_id=client_id, client_secret=client_secret)
sp = spotipy.Spotify(client_credentials_manager=client_credentials_manager)

bot.volume = 0.5 # initial volume of the bot (can be changed)

@bot.command()
async def play(ctx, *, track_query):
    # check if the query is a valid Spotify link
    if 'open.spotify.com/track/' in track_query:
        track_id = track_query.split('/')[-1] # extract the track ID from the link
    else:
        # search for tracks with the given name
        track_results = sp.search(q=track_query, type='track', limit=1)
        if len(track_results['tracks']['items']) == 0:
            await ctx.send(f'Sorry, I could not find any track with the name "{track_query}".')
            return
        track_id = track_results['tracks']['items'][0]['id'] # get the track ID for the first search result
    track_info = sp.track(track_id) # get the track information for the given ID
    track_name = track_info['name']
    track_artist = track_info['artists'][0]['name']
    track_duration = time.strftime('%M:%S', time.gmtime(track_info['duration_ms']//1000))
    track_preview_url = track_info['preview_url'] # get the preview URL for the track
    if track_preview_url is None:
        await ctx.send(f'Sorry, the track "{track_name}" by {track_artist} cannot be played.')
        return
    voice_channel = ctx.author.voice.channel
    if voice_channel is None:
        await ctx.send('Please join a voice channel first.')
        return
    voice_client = await voice_channel.connect()
    audio_source = discord.FFmpegPCMAudio(track_preview_url, options="-b:a 128k -bufsize 512k")
    voice_client.play(audio_source, after=lambda e: print('Player error: %s' % e) if e else None)
    voice_client.source = discord.PCMVolumeTransformer(voice_client.source)
    voice_client.source.volume = bot.volume

    # format the embed message
    embed = discord.Embed(title=track_name, description=track_artist, color=0xff8c00)
    embed.add_field(name='Duration', value=track_duration, inline=True)
    embed.set_thumbnail(url=track_info['album']['images'][0]['url'])
    embed.set_footer(text='This music is from https://www.spotify.com/')
    await ctx.send(embed=embed)

    while voice_client.is_playing():
        await asyncio.sleep(1)
    await voice_client.disconnect()


  


  I joined the unofficial ffmpeg discord server no one could find a fix I searched for ages and I couldn't fix it

  


• AAC bitstream not in ADTS format and extradata missing in MPEG-TS output

  6 décembre 2022, par Antonio

  I am using ffmpeg 5.1.2 stable version, and fdk-aac v0.1.6 .
I am trying to encapsulate a LATM/LOAS in an MPEGTS DVB standard output, using this cmdline :

  


  ffmpeg -i <source> -af volume=volume=1dB:precision=fixed -c:a libfdk_aac -latm 1 -b:a 128k -c:v libx264 -pix_fmt yuv420p -preset veryfast -x264-params "nal-hrd=cbr:keyint=50:min-keyint=50" -b:v 3200k -minrate 3200k -maxrate 3200k -bufsize 6400k -flush_packets 0 -f mpegts -mpegts_original_network_id 1 -mpegts_transport_stream_id 1 -mpegts_service_id 1 -mpegts_service_type &#x27;0x19&#x27; -mpegts_flags &#x27;latm&#x27; -mpegts_flags &#x27;system_b&#x27; -mpegts_flags &#x27;nit&#x27; -muxrate 4000000 -metadata service_provider=&#x27;MyRTV&#x27; -metadata service_name=&#x27;My TV&#x27; -tables_version 0 &#x27;udp://238.0.0.1:6000?ttl=1&amp;pkt_size=1316&amp;bitrate=4000000&#x27;&#xA;</source>

  


  It logs and error :

  


  [mpegts @ 0x556dc3e6a840] AAC bitstream not in ADTS format and extradata missing


  


  What am I missing ?
Thanks in advance and best regards

  


  I am trying to encapsulate a LATM/LOAS in an MPEGTS DVB standard output, so expect to have a LOAS/LATM output, but I obtain an ADTS output.