Recherche avancée

Sur d’autres sites (9733)

• avformat_write_header error() error -22 : Could not write header to '' "

  11 septembre 2023, par Saurabh Sharma

  I am trying to extract audio from video byte array file using ffmpeg library and store the output in another byte array.
Here is my implementation :

  


    private byte[] extractAudioFromVideo(byte[] videoBytes) {

        try {
            FFmpegLogCallback.set();
            ByteArrayInputStream videoData = new ByteArrayInputStream(videoBytes);

            ByteArrayOutputStream audioData = new ByteArrayOutputStream();

            FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(videoData);
            grabber.start();
      
            FrameRecorder recorder = new FFmpegFrameRecorder(audioData, grabber.getAudioChannels());
            recorder.setFormat("wav");
            recorder.setAudioCodec(avcodec.AV_CODEC_ID_ADPCM_IMA_WAV);
            recorder.setAudioBitrate(grabber.getAudioBitrate());
            recorder.setAudioChannels(grabber.getAudioChannels());
            recorder.setAudioQuality(0);
            recorder.start();


            // Grab and record audio frames
            Frame audioFrame;
            while ((audioFrame = grabber.grabSamples()) != null) {
                recorder.record(audioFrame);
            }

       
            grabber.stop();
            recorder.stop();
            
            return audioData.toByteArray();
        } catch (FFmpegFrameGrabber.Exception | FrameRecorder.Exception e) {
            e.printStackTrace();
        }


  


  On running the above code, I am running into the error

  


  org.bytedeco.javacv.FrameRecorder$Exception: avformat_write_header error() error -22: Could not write header to ''
    at org.bytedeco.javacv.FFmpegFrameRecorder.startUnsafe(FFmpegFrameRecorder.java:900)
    at org.bytedeco.javacv.FFmpegFrameRecorder.start(FFmpegFrameRecorder.java:406)


  


  On adding FFmpegLogCallback.set() in the above code for detailed logs it says
Error : [wav @ 0x7f9910eb4780] No streams to mux were specified

  


  Info: Input #0, matroska,webm, from 'java.io.ByteArrayInputStream@36d592ba':

Info:   Metadata:

Info:     encoder         : 
Info: Chrome
Info: 

Info:   Duration: 
Info: N/A
Info: , start: 
Info: 0.000000
Info: , bitrate: 
Info: N/A
Info: 

Info:     Stream #0:0
Info: (eng)
Info: : Audio: opus, 48000 Hz, mono, fltp
Info:  (default)
Info: 

Info:     Stream #0:1
Info: (eng)
Info: : Video: h264 (Constrained Baseline), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9]
Info: , 
Info: 30.30 fps, 
Info: 30 tbr, 
Info: 1k tbn, 
Info: 60 tbc
Info:  (default)
Info: 

Error: [wav @ 0x7f9910eb4780] No streams to mux were specified


  


  Can someone please suggest how to resolve it

  


  Thanks

  


• How do I resolve ffmpeg concat command error "unknown keyword..." ?

  6 décembre 2023, par Scorb

  I am trying to concatenate two video files using ffmpeg, and I am receiving an error.

  


  To eliminate compatibility issues between the two videos, I have been concatenating the same video with itself, and the same error persists.

  


  ffmpeg \
  -f concat \
  -safe 0 \
  -i intro_prepped.avi intro_prepped.avi \
  -c copy \
  concat.avi  


  


  And the error output I receive is....

  


  


  [concat @ 0x220d420] Line 1 : unknown keyword 'RIFFf� ?'
intro_prepped.avi : Invalid data found when processing input

  


  


  I have tried various combinations of concat flags and have not been able to get it to work. Has anyone seen this error before ?

  


• How do i fix the error "ffmpeg was not found." in my discord bot ?

  4 janvier 2023, par Anton Abboud

  I am currently trying to make my discord bot play a youtube audio from a URL. However, I can't pass the error "ffmpeg was not found". I have tried to use different solutions but nothing has worked. My code currently looks like this :

  


  import discord
import asyncio
from discord import FFmpegPCMAudio
from discord.utils import get
from discord.ext import commands
from youtube_dl import YoutubeDL

@bot.command(brief="Plays a single video, from a youtube URL")
async def play(ctx, url):
    if not ctx.message.author.voice:
        await ctx.send("{} is not connected to a voice channel".format(ctx.message.author.name))
        return
    else:
        global channel_player
        channel_player = ctx.message.author.voice.channel
    await channel_player.connect()
    YDL_OPTIONS = {'format': 'bestaudio', 'noplaylist':'True'}
    FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}
    voice = get(bot.voice_clients, guild=ctx.guild)

    if not voice.is_playing():
        with YoutubeDL(YDL_OPTIONS) as ydl:
            info = ydl.extract_info(url, download=False)
        URL = info['url']
        voice.play(FFmpegPCMAudio(URL, **FFMPEG_OPTIONS))
        voice.is_playing()
    else:
        await ctx.send("Already playing song")
        return


  


  I am relatively new to coding so if you have any other suggestions on top of (hopefully) the solution to the problem, feel free !

  


  I am relatively new to coding so if you have any other suggestions on top of (hopefully) the solution to the problem, feel free !

  


  I have as I said tried a few different other approaches but nothing has worked. The one that seemed to almost work was to download ffmpeg through libx264 and create files that python could be directed to.

  


  I also tried downloadeing the most recent version of ffmpeg and 7zip to extract it.