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• From Python, piping images to FFMPEG process with audio input, "-shortest" flag causes output file to contain only 1 frame of video and entire audio

  7 novembre 2023, par b_yang

  From Python, I run FFMPEG and write images to its stdin via pipe, the FFMPEG process has an audio file as input too. Everything works fine like this :

  


  cmd = ['ffmpeg', '-hide_banner', '-y', '-loglevel', 'error', '-f', 'rawvideo', 
'-pix_fmt', 'bgr24', '-video_size', '720x1280', '-r', '30.0', '-an', '-i', '-',
'-i', 'audio.aac', '-acodec', 'copy', 
'-crf', '14', '-pix_fmt', 'yuv420p', 'output.mp4']
proc = subprocess.Popen(cmd, **popen_params)


  


  Because the audio duration might be longer than the video duration, I added a '-shortest' flag (before '-crf') :

  


  cmd = ['ffmpeg', '-hide_banner', '-y', '-loglevel', 'error', '-f', 'rawvideo', 
'-pix_fmt', 'bgr24', '-video_size', '720x1280', '-r', '30.0', '-an', '-i', '-',
'-i', 'audio.aac', '-acodec', 'copy', 
'-shortest', '-crf', '14', '-pix_fmt', 'yuv420p', 'output.mp4']
proc = subprocess.Popen(cmd, **popen_params)


  


  However, with the '-shortest' flag, the resulting output.mp4 contains the entire audio, but only 1 frame of video data. What is going on here ?

  


• yt_dlp gives a strange message : "Seek to desired resync point failed. Seeking to earliest point available instead." and "File ended prematurely"

  16 septembre 2023, par nikita goncharov

  I have a discord bot (discord.py) in python and it can play music. Lastly it had trouble in playing the music, giving some random warnings but it mostly worked. But now it gives me this message :

  


  [matroska,webm @ 000001570fe92d40] Seek to desired resync point failed. Seeking to earliest point available instead.


  


  [matroska,webm @ 000001570fe92d40] File ended prematurely


  


  and also this one

  


  Warning: program compiled against libxml 211 using older 209


  


  As I saw this is a very common warning but I still have no Idea how to fix it.

  


  I will leave the code of the bot down bellow :

  


  Ytdlp setup (I have renamed the librarie to be youtube_dl)

  


  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': True,
    'quiet': True,
    'no_warnings': False,
    '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')
        img = ""
        imgs = ['']
        for image in data.get("thumbnails"):
            img = image["url"]
            imgs.append(image["url"])
        self.image = img
        self.thumbnails = imgs


  


  The play command :

  


  # if message.author.voice_client is not None:
try:
    print(1)
    sessionChannel = message.author.voice.channel
except:
    embedAns = discord.Embed(color=discord.Color.from_rgb(255, 201, 115))
    # embedImg.set_image(url=player.image)
    # embedImg.type = "image"
    embedAns.add_field(name="Player", value=f'To play audio you must join a voice channel!',
                       inline=True)
    embedAns.add_field(name="", value=f'*{message.author.name}*', inline=False)
    # embedImg.image.width = "800"
    await message.channel.send(embed=embedAns)
try:
    print(2)
    await message.author.voice.channel.connect(reconnect=False)
    print(2)
except:
    pass
"""embedAns = discord.Embed(color=discord.Color.from_rgb(102, 196, 250))
# embedImg.set_image(url=player.image)
# embedImg.type = "image"
embedAns.add_field(name="Player", value=f'Succesfuly joined voice channel to play music in {sessionChannel}! Loading in youtube song... Please wait...', inline=True)
embedAns.add_field(name="", value=f'*{message.author.name}*', inline=False)
# embedImg.image.width = "800"
await message.channel.send(embed=embedAns)"""
try:
    print(3)
    load = await message.channel.send(
        f'Succesfuly joined voice channel to play music in {sessionChannel}')
    print(4)
    url = matched.group(1)
    player = await YTDLSource.from_url(url, loop=client.loop, stream=True)
    # Embed = await YTDLSource.from_url(url, loop=client.loop, stream=False)
    sessionChannel.guild.voice_client.play(player, after=lambda e: print(
        f'Player error: {e}') if e else None)
    await load.delete()
    sec = player.duration % 60
    temp = player.duration // 60
    min = temp % 60
    hour = temp // 60
    if hour == 0:
        timeStr = f"{min:02d}:{sec:02d}"
    else:
        timeStr = f"{hour}:{min:02d}:{sec:02d}"
    # await message.reply()
    embedImg = discord.Embed(color=discord.Color.from_rgb(102, 196, 250))
    # embedImg.set_image(url=player.image)
    # embedImg.type = "image"
    embedImg.set_thumbnail(url=player.image)
    embedImg.add_field(name="Player", value=f'Now playing: **{player.title}** \n `{timeStr}`',
                       inline=True)
    embedImg.add_field(name="", value=f'Requested by: {message.author.name}', inline=False)
    # embedImg.image.width = "800"
    await message.channel.send(embed=embedImg)
except Exception as ex:
    embedAns = discord.Embed(color=discord.Color.from_rgb(255, 119, 115))
    # embedImg.set_image(url=player.image)
    # embedImg.type = "image"
    # embedImg.set_thumbnail(url=player.image)
    embedAns.add_field(name="Player Error",
                       value=f'Couldent play audio on {sessionChannel} \n`{ex}`', inline=True)
    embedAns.add_field(name="", value=f'Requested by: {message.author.name}', inline=False)


  


• avcodec/h264dec : Fix data race when updating decode_error_flags

  12 septembre 2023, par Andreas Rheinhardt

  avcodec/h264dec : Fix data race when updating decode_error_flags
  When using multi-threaded decoding, every decoding thread
  
  has its own DBP consisting of H264Pictures and each of these
  
  points to its own AVFrames. They are synced during
  
  update_thread_context via av_frame_ref() and therefore
  
  the threads actually decoding (as well as all the others)
  
  must not modify any field that is copied by av_frame_ref()
  
  after ff_thread_finish_setup().
  Yet this is exactly what happens when an error occurs
  
  during decoding and the AVFrame's decode_error_flags are updated.
  
  Given that these errors only become apparent during decoding,
  
  this can't be set before ff_thread_finish_setup() without
  
  defeating the point of frame-threading ; in practice,
  
  this meant that the decoder did not set these flags correctly
  
  in case frame-threading was in use. (This means that e.g.
  
  the ffmpeg cli tool fails to output its "corrupt decoded frame"
  
  message in a nondeterministic fashion.)
  This commit fixes this by adding a new H264Picture field
  
  that is actually propagated across threads ; the field
  
  is an AVBufferRef* whose data is an atomic_int ; it is
  
  atomic in order to allow multiple threads to update it
  
  concurrently and not to provide synchronization
  
  between the threads setting the field and the thread
  
  ultimately returning the AVFrame.
  This unfortunately has the overhead of one allocation
  
  per H264Picture (both the original one as well as
  
  creating a reference to an existing one), even in case
  
  of no errors. In order to mitigate this, an AVBufferPool
  
  has been used and only if frame-threading is actually
  
  in use. This expense will be removed as soon as
  
  a proper API for refcounted objects (not based upon
  
  AVBuffer) is in place.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/h264_picture.c
  • [DH] libavcodec/h264_slice.c
  • [DH] libavcodec/h264dec.c
  • [DH] libavcodec/h264dec.h