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• FFmpeg : canvas and crop work separately but result in black screen when combined

  25 janvier, par didi00

  I'm working on a video processing pipeline with FFmpeg, where I :

  


  

  • Create a black canvas using the color filter.

  


  • Crop a region from my video input.

  


  • Overlay the cropped region onto the black canvas.

  


  


  Both the canvas and the crop display correctly when tested individually. However, when I attempt to combine them (overlay the crop onto the canvas), the result is a black screen.
What Works :

  


  Black Canvas Alone :

  


  ffmpeg -filter_complex "color=c=black:s=1920x1080[out]" -map "[out]" -f nut - | ffplay 
-


  


  This shows a plain black screen, as expected.

  


  Cropped Region Alone :

  


  ffmpeg -f v4l2 -input_format yuyv422 -framerate 60 -video_size 1920x1080 -i /dev/video0 
\ -vf "crop=1024:192:0:0" -f nut - | ffplay -


  


  This shows the cropped region of the video correctly.

  


  When I combine these steps to overlay the crop onto the black canvas, I get a black screen :

  


  ffmpeg -f v4l2 -input_format yuyv422 -framerate 60 -video_size 1920x1080 -i /dev/video0 
\-filter_complex "color=c=black:s=1920x1080,format=yuv420p[background]; \
[0:v]crop=1024:192:0:0,format=yuv420p[region0]; \
[background][region0]overlay=x=0:y=0[out]" \
-map "[out]" -f nut - | ffplay -


  


  Environment :

  


  

  • OS : Linux (Debian-based)

  


  • FFmpeg Version : [Insert version, e.g., 4.x or 5.x]

  


  • Capture Card Format : yuyv422

  


  


  Question :

  


  Why does the pipeline result in a black screen when combining the canvas and the crop, even though both work separately ? Is this an issue with pixel format compatibility, or is there something I'm overlooking in the overlay filter setup ?

  


• Error : Unable to extract uploader id - Youtube, Discord.py

  22 juillet 2024, par nikita goncharov

  I have a very powerful bot in discord (discord.py, PYTHON) and it can play music in voice channels. It gets the music from youtube (youtube_dl). It worked perfectly before but now it doesn't want to work with any video.
I tried updating youtube_dl but it still doesn't work
I searched everywhere but I still can't find a answer that might help me.

  


  This is the Error : Error: Unable to extract uploader id

  


  After and before the error log there is no more information.
Can anyone help ?

  


  I will leave some of the code that I use for my bot...
The youtube setup settings :

  


  youtube_dl.utils.bug_reports_message = lambda: ''


ytdl_format_options = {
    'format': 'bestaudio/best',
    'outtmpl': '%(extractor)s-%(id)s-%(title)s.%(ext)s',
    'restrictfilenames': True,
    'noplaylist': True,
    'nocheckcertificate': True,
    'ignoreerrors': False,
    'logtostderr': False,
    'quiet': True,
    'no_warnings': True,
    'default_search': 'auto',
    'source_address': '0.0.0.0',  # bind to ipv4 since ipv6 addresses cause issues sometimes
}

ffmpeg_options = {
    'options': '-vn',
}

ytdl = youtube_dl.YoutubeDL(ytdl_format_options)


class YTDLSource(discord.PCMVolumeTransformer):
    def __init__(self, source, *, data, volume=0.5):
        super().__init__(source, volume)

        self.data = data

        self.title = data.get('title')
        self.url = data.get('url')
        self.duration = data.get('duration')
        self.image = data.get("thumbnails")[0]["url"]
    @classmethod
    async def from_url(cls, url, *, loop=None, stream=False):
        loop = loop or asyncio.get_event_loop()
        data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download=not stream))
        #print(data)

        if 'entries' in data:
            # take first item from a playlist
            data = data['entries'][0]
        #print(data["thumbnails"][0]["url"])
        #print(data["duration"])
        filename = data['url'] if stream else ytdl.prepare_filename(data)
        return cls(discord.FFmpegPCMAudio(filename, **ffmpeg_options), data=data)



  


  Approximately the command to run the audio (from my bot) :

  


  sessionChanel = message.author.voice.channel
await sessionChannel.connect()
url = matched.group(1)
player = await YTDLSource.from_url(url, loop=client.loop, stream=True)
sessionChannel.guild.voice_client.play(player, after=lambda e: print(
                                       f'Player error: {e}') if e else None)


  


• How to call ffmpeg video command in android

  22 mars 2021, par connor449

  I am trying to use this command :

  


  FFmpeg.execute("-f android_camera -i 0:0 -r 30 -pixel_format bgr0 -t 00:00:05 <record file="file" path="path">");</record>

  


  from this library :

  


  https://github.com/tanersener/mobile-ffmpeg

  


  The command tells the camera to start recording according to the specifications defined in the command.

  


  As a brand new android developer, I have the following question :

  


  Where/how do I add this command into my code ? I am following the basic tutorial on android that shows you how to make an app with a text field and a button. I want to use the button as a way to trigger this video command. Below is my code in MainActivity.kt :

  


  package com.example.camera&#xA;&#xA;import androidx.appcompat.app.AppCompatActivity&#xA;import android.content.Intent&#xA;import android.os.Bundle&#xA;import android.view.View&#xA;import android.widget.EditText&#xA;import com.arthenica.mobileffmpeg.FFmpeg;&#xA;&#xA;&#xA;&#xA;const val EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE"&#xA;&#xA;class MainActivity : AppCompatActivity() {&#xA;    override fun onCreate(savedInstanceState: Bundle?) {&#xA;        super.onCreate(savedInstanceState)&#xA;        setContentView(R.layout.activity_main)&#xA;    }&#xA;&#xA;    /** Called when the user taps the Send button */&#xA;    fun sendMessage(view: View) {&#xA;        val editText = findViewById<edittext>(R.id.editText)&#xA;        val message = editText.text.toString()&#xA;        val intent = Intent(this, DisplayMessageActivity::class.java).apply {&#xA;            putExtra(EXTRA_MESSAGE, message)&#xA;        }&#xA;  &#xA;&#xA;        startActivity(intent)&#xA;    }&#xA;}&#xA;</edittext>

  


  Is this the right file to add the command in ? If so, how do I add it ? For now, I just want the video to start recording after I click the button on the app.

  


  I tried this :

  


          val intent = Intent(FFmpeg.execute("-f android_camera -i 0:0 -r 30 -pixel_format bgr0 -t 00:00:05"))


  


  but I got this error :

  


  e: /Users/AndroidStudioProjects/camera/app/src/main/java/com/example/camera/MainActivity.kt: (27, 22): None of the following functions can be called with the arguments supplied: 
public constructor Intent(p0: Intent!) defined in android.content.Intent
public constructor Intent(p0: String!) defined in android.content.Intent