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• Modifying incorrect h.264 dimension in existing video file

  11 juin 2015, par RichyJ

  After searching a lot, I’m more confused than ever !! To summarise :

  I recorded a video using my HTC One M8, using 1920x1088 resolution, and it came out fine. The next day, for some reason, in the settings I changed to 1920x1080 and the next video was weird - green bar across the top, diagonal green lines throughout and odd colour stripes. The underlying image was fine, although there seem to be some ’frame jumps’ at times. Unfortunately, this second video contained a section I would like to keep, so I’m trying to fix it...

  I’ve learned a bit about AVC/H.264, but it’s pretty confusing. Essentially, I wonder whether I can just change the ’1080’ in the file info to ’1088’ and salvage the footage - there’s no audio to worry about. I read that since 1080 is not directly divisible by 16, most encoders actually do 1088 then the player discards the remaining 8 lines at playback time. I wonder whether this is the root of the problem ? I tried to get into NALs, SPS/PPS etc, but couldn’t really fathom whether this was even relevant to my problem. A hex search didn’t even find anything that looked like the NALs given as examples elsewhere :

  Finding SPS/PPS data strings

  What does this NAL header data mean ?

  Fetching dimensions of a video

  I’ve loaded both files into a Hex editor and compared as best I can (around the moov and avcC parts), but haven’t fixed it yet. One of the single byte changes I made and saved to a new ’test’ file brought up additional info in the mediainfo program, showing that the original recording was at 1088 - this hadn’t been there before, but it still played wrongly. I found info regarding the encoding of height and width (units-1 * 16) but couldn’t work out how to use this info in practice.

  I tried ffmpeg and dumping to raw video, but couldn’t make this play at all as a yuv file.

  So, my question is, will I be able to change just one byte (or a few) in the file, to make it read as 1088 to the player, or am I looking in totally the wrong direction ?!? Is this even possible ? As I say, the actual images look intact throughout, just the colours are wrong and the lines are there, so I believe it’s something to do with YCrCb problems, but at this point, I’m lost...

  I know this isn’t specifically about programming, but the above links were all from this site, so thought it might be OK to ask here. Any help would be much appreciated !!

  I’ve recreated the conditions and done 2 short clips at 1080 and 1088 for you to see the problem but as I’m new, I can’t post them here yet. They’re on my Photobucket page if you are willing to look at them (hope this isn’t breaking the rules !!). The blueish line at the bottom is the windowsill...

  1088 still

  1080 still

• discord.py music bot can't play next song

  6 décembre 2020, par bork

  I'm making a discord music bot using ffmpeg and youtube-dl. I have a premade playlist of urls that would play the list of songs once a user chooses it.
  
this is my code for playing the audio

  


  ydl_opts = {
            'format': 'bestaudio', 
            'noplaylist':'True',
            'youtube_include_dash_manifest': False
            }
FFMPEG_OPTIONS = {
            'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5',
            'options': '-vn'
            }

songs = url[playlist]
dur_min = 0
pre_dur_sec = 0
with YoutubeDL(ydl_opts) as ydl:
    for i in songs:
        info = ydl.extract_info(i, download = False)
        dur = info['duration']
        playlist_songs.append(info)

playlist_songs_copy = playlist_songs.copy()
for i in playlist_songs_copy:
    info = playlist_songs.pop(0)
    URL = info['formats'][0]['url']
    player = FFmpegPCMAudio(URL, **FFMPEG_OPTIONS)
    q.append(player)
    q_playlist.append(playlist)

if not voice.is_playing():
    source = q.pop(0)  
    playlist = q_playlist.pop(0)
    dur_min = duration_min.pop(0)
    dur_sec = duration_sec.pop(0)  
    voice.play(source, after = lambda e: play_next(ctx, source))      
    voice.is_playing()
    await ctx.send(f'```nim\n*Now Playing:*\nplaylist {playlist}: {name[playlist]}\n\n{content[playlist]}\n\ntotal duration: {dur_min}:{dur_sec}```')


  


  and this is my code for playing the next song

  


  def play_next(ctx, source):
    voice = get(client.voice_clients, guild = ctx.guild)
    if len(q) >= 1:
        try:
            del combine_q[0]
            source = q.pop(0)
            playlist = q_playlist.pop(0)
            dur_min = duration_min.pop(0)
            dur_sec = duration_sec.pop(0)

        except:
            pass

        voice.play(source, after = lambda e: play_next(ctx, source))
        try:
            asyncio.run_coroutine_threadsafe(ctx.send(f'```nim\n*Now Playing:*\nplaylist {playlist}: {name[playlist]}\n\n{content[playlist]}\n\ntotal duration: {dur_min}:{dur_sec}```'), client.loop)
        
        except:
            asyncio.run_coroutine_threadsafe(ctx.send('```nim\nPlaying the next song...```'), client.loop)
        
    else:
        time.sleep(30) 
        if not voice.is_playing():
            asyncio.run_coroutine_threadsafe(voice.disconnect(), client.loop)
            asyncio.run_coroutine_threadsafe(ctx.send("```nim\nNo more songs in queue.```"),client.loop)
            voice.is_paused()


  


  Up till today, it's been working fine. But I was using the bot just now and instead of playing the song and sending the message "Playing the next song..." as usual, it just stopped and spammed the message for about 30 times before it disconnected. When I checked the logs, it showed
socket.send() raised exception
, which was also spammed in the terminal. When I tried making the bot reconnect, it joined my voice channel but didn't respond to any commands and would keep making the discord "connecting" noise. It wouldn't even leave with my .leave command unless I completely turned it off via the script.

  


  The same connecting problem would continue even after I reran the script and would only stop after I restarted my VS Code which is really odd...

  


  After some testing I found out that as of now, the bot is only able to play two songs before breaking. I really need help as this just happened randomly and I'm unable to find anything online about the problem.

  


• Anomalie #2003 (Nouveau) : calculer_select, jointures complexes

  25 février 2011, par Jean-Jacques Puig

  Bonjour, J’ai observé un dysfonctionnement dans les recherches sur des données traitées par le plugin forms_and_tables_2_0 ; cependant, je rapporte ce problème ici car il ne me semble pas évident que la correction doive se faire du côté de ce plugin. Le problème vient d’une combinaison du critère (...)