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• ffprobe reading wrong frame rate, any workarounds besides MediaInfo ?

  20 mai 2023, par Minty

  I want to check the frame rate of many videos. I decided to employ ffprobe :

  


  ffprobe -v error -select_streams v -of default=noprint_wrappers=1:nokey=1 -show_entries stream=r_frame_rate faulty.mkv =

  


  500/21


  


  That can't be right, what kind of fps is 500/21 ?

  


  ffprobe faulty.mkv (version 4.3.5-0+deb11u1+rpt3)

  


  Stream #0:0: Video: (...), 23.81 fps, 23.81 tbr, 1k tbn, 23.98 tbc (default)


  


  At least ffprobe 4 read the correct codec timescale i.e. 23.98 tbc (default), but in later versions tbc has been deprecated :

  


  Stream #0:0: Video: (...), 23.81 fps, 23.81 tbr, 1k tbn (default)


  


  However, MediaInfo gets it right :

  


  mediainfo faulty.mkv =

  


  (...)
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
(...)


  


  I tried using -count_packets to then divide nb_read_packets of the stream by the duration of the file, I'm getting 1 second per hour error. This is much better compared to 23,8095, but packets are not frames, and only the prohibitively, unusably slow -count_frames gets me the exact value.

  


  The rest of my workflow uses ffprobe, so I'm reluctant to switch to MediaInfo completely. I get that the file is, well, faulty, but if mediainfo can do it, is there a way to make sure the correct frame rate is read with ffprobe without decoding the entire file as -count_frames seems to do ?

  


• FFMPEG - Accurately cutting video/audio and merging multiple videos together

  8 février 2023, par 3EK

  This post has been updated since the original post

  


  thanks in advance for any help I get with this...

  


  I am working with 4 video assets....all stereo audio, same a/v spec.

  


  intro -
mainvideo -
midroll_video (advert) -
endboard

  


  I need to add an audio only cross fade between the 2 video elements part2.mp4 and pip.mp4. These 2 videos are made by the code (rather than being 2 of the 4 videos listed above). I have added in the code as kindly instructed by @Баяр Гончикжапов but unfortunately it is still not working. See conversation below for more info/ the part i need help with.

  


  Thanks in advance !

  


  This is the code I am using.

  


  
# Input parameters
mainvideo=mezzfile.mp4
endboard=endboard.mp4
intro=sting.mp4
midroll_video=midroll.mp4

tailtime=20
fadelength=0.2
midroll_edit_value=00:11:31.600

# Time calculations to define cut point
duration=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 $mainvideo)
endboard_cut_point=$(echo "scale=2;$duration-$tailtime" | bc)

duration=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 $mainvideo)
midroll_cut_point=$(echo "scale=2;$duration-$midroll_edit_value" | bc)

# Safety check
tbn_main=$(ffprobe -v error -select_streams v -show_entries stream=time_base -of default=noprint_wrappers=1:nokey=1 $mainvideo)
tbn_main=${tbn_main#*/}
tbn_intro=$(ffprobe -v error -select_streams v -show_entries stream=time_base -of default=noprint_wrappers=1:nokey=1 $intro)
tbn_intro=${tbn_intro#*/}
tbn_end=$(ffprobe -v error -select_streams v -show_entries stream=time_base -of default=noprint_wrappers=1:nokey=1 $endboard)
tbn_end=${tbn_end#*/}

if [[ $(( ($tbn_intro+$tbn_main+$tbn_end)/3 )) -ne $tbn_main ]]; then
  echo "WARNING: source video files have the different timebase."
  echo "The use of the concat demuxer will produce incorrect output."
  echo "Re-encoding is highly recommended."
  read -s -k $'?Press any key to exit.\n'
  exit 1
fi

# Trim the main part of mainvideo
ffmpeg -hide_banner -y -i $mainvideo -to $midroll_edit_value -c copy part1.mp4

ffmpeg -hide_banner -y -i $mainvideo -ss $midroll_edit_value -to $endboard_cut_point -c copy part2.mp4

ffmpeg -hide_banner -y -i $mainvideo -ss $midroll_edit_value -to $duration -c copy part2av.mp4


# Trim the tail of mainvideo and overlay it onto endboard
ffmpeg -hide_banner -y \
  -i $mainvideo \
  -i $endboard \
  -filter_complex \
    "[0:v]select='gt(t,$duration-$tailtime)',scale=w=iw/2.03:h=ih/2.03,setpts=PTS-STARTPTS[v_tail]; \
     [0:a]aselect='gt(t,$duration-$tailtime)',asetpts=PTS-STARTPTS[a_out]; \
     [1:v][v_tail]overlay=format=auto[v_out]" \
  -map "[v_out]" \
  -map "[a_out]" \
  -video_track_timescale $tbn_main \
  pip.mp4

ffmpeg -hide_banner -y -i "part2.mp4" -i "part2av.mp4" -i "pip.mp4" \
  -filter_complex \
     -map "[0:v];" 
     -map "[1:a];" 
     -map "[2:v]" 
     -c copy "part2pip.mp4" \

# Pass all parts through the concat demuxer
[ -f filelist.txt ] && rm filelist.txt
for f in $intro part1.mp4 $midroll_video part2pip.mp4; do echo "file '$PWD/$f'" >> filelist.txt; done
ffmpeg -hide_banner -y -f concat -safe 0 -i filelist.txt -c copy TEST_FILE.mp4

# Sweep the table
rm pip.mp4 part1.mp4 part2.mp4 filelist.txt```


  


• 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)