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• Convert form 30 to 60fps by increasing speed, not duplicating frames, using FFmpeg

  12 août 2018, par Matt Pellegrini

  I have a video that is incorrectly labelled at 30fps, it is actually 60fps and so looks like it’s being played at half speed. The audio is fine, that is, the soundtrack finishes half way through the video clip. I’d like to know how, if possible to fix this, that is double the video speed, making it 60fps and meaning that the audio and video are synced.

  The file is H.264 and the audio MPEG-4 AAC.

  File details as given by ffmpeg, as requested :

  ffmpeg version 0.8.9-6:0.8.9-0ubuntu0.13.10.1, Copyright (c) 2000-2013 the Libav developers
  
  built on Nov  9 2013 19:09:46 with gcc 4.8.1
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './Tignes60fps.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2014-01-13 02:23:09
  
      Duration: 00:08:33.21, start: 0.000000, bitrate: 5690 kb/s
  
      Stream #0.0(eng): Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 5609 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
  
  Metadata:
  
      creation_time   : 2014-01-13 02:23:09
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 156 kb/s
  
  Metadata:
  
        creation_time   : 2014-01-13 02:23:09
  
  At least one output file must be specified

• music bot stopping music entirely instead of skipping one song discord.py

  26 septembre 2018, par Y4h L

  When i use my skip command, my program stops playing music, instead of skipping a song.
  Here’s the code :

  queues = {}
  
  players = {}
  
  opts = {
  
              'default_search': 'auto',
  
              'quiet': True,
  
          }
  
  voice_states = {}
  
  
  
  class voice:
  
      def __init__(self, client):
  
          self.client = client
  
  
  
      @commands.command(pass_context=True)
  
      async def skip(self, ctx):
  
          id = ctx.message.server.id
  
          players[id].stop()
  
  
  
      @commands.command(
  
          pass_context=True
  
      )
  
      async def play(self, ctx, url):
  
          server = ctx.message.server
  
          channel = ctx.message.author.voice.voice_channel
  
          try:
  
              await self.client.join_voice_channel(channel)
  
          except:
  
              print(" ")
  
          if server.id not in players or players[server.id].is_done():
  
              server = ctx.message.server
  
              voice_client = self.client.voice_client_in(server)
  
              player = await voice_client.create_ytdl_player(url, after=lambda: queue(server.id), ytdl_options=opts)
  
              players[server.id] = player
  
              await self.client.say('Now Playing ' )
  
              player.start()
  
          else:
  
              server = ctx.message.server
  
              voice_client = self.client.voice_client_in(server)
  
              player = await voice_client.create_ytdl_player(url, after=lambda: queue(server.id),  ytdl_options=opts)
  
  
  
              if server.id in queues:
  
                  queues[server.id].append(player)
  
              else:
  
                  queues[server.id] = [player]
  
              await self.client.say('Now Playing ' )
  
              await self.client.say('Video queued.')
  
  
  
      def queue(self, id):
  
          if queues[id] != []:
  
              player = queues[id].pop(0)
  
              players[id] = player
  
              player.start()
  
  
  
  def setup(client):
  
      client.add_cog(voice(client))

  i receive no error codes,
  just no queue.
  Fixes to my code or own solutions are appreciated.
  Sorry, for long code, but you need all the context

• Trying to use openH264 as an alternative to libX264 in FFMPEG C project

  18 octobre 2019, par tishu

  I have an application that transcodes a video frame by frame using FFMPEG and x264 encoder. I am looking to release this application but the licensing of x264 made me switch to using openh264 instead.

  I managed to compile everything smoothly (openh264 then FFMPEG with enable-openh264). I am now trying to correct the encoder setup in my C code as what worked for libx264 doesn’t work anymore. Unfortunately I found very limited C/C++ examples of FFMPEG/openh264, i would appreciate any link/hint.

  I am using the following code (dec_ctx is the AVCodecContext of the video I am decoding)

              enc_ctx->height = dec_ctx->height;
  
              enc_ctx->width = dec_ctx->width;
  
              enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
  
              /* take first format from list of supported formats */
  
              enc_ctx->pix_fmt = encoder->pix_fmts[0];
  
              /* video time_base can be set to whatever is handy and supported by encoder */
  
              enc_ctx->time_base = dec_ctx->time_base;
  
  
  
              enc_ctx->gop_size      = 120; /* emit one intra frame every twelve frames at most */
  
              enc_ctx->max_b_frames = 16;
  
              enc_ctx->scenechange_threshold = 0;
  
              enc_ctx->rc_buffer_size = 0;
  
              enc_ctx->me_method = ME_ZERO;
  
  
  
              enc_ctx->ticks_per_frame = dec_ctx->ticks_per_frame * ifmt_ctx->streams[i]->time_base.den * ifmt_ctx->streams[i]->r_frame_rate.num/ifmt_ctx->streams[i]->r_frame_rate.den;
  
              // Set Ultrafast profile. internal name for this preset is baseline
  
              av_opt_set(enc_ctx->priv_data, "preset", "placebo", AV_OPT_SEARCH_CHILDREN);

  I get the following errors in the output with the [OpenH264] tag :

  [OpenH264] this = 0x0000000019C126C0, Warning:bEnableFrameSkip = 0,bitrate can't be controlled for RC_QUALITY_MODE,RC_BITRATE_MODE and RC_TIMESTAMP_MODE without enabling skip frame.
  
  Output #0, mp4, to 'C:\Dev\temp\geoVid.mp4':
  
  Stream #0:0: Video: h264 (libopenh264), yuv420p, 720x480, q=2-31, 200 kb/s, 90k tbn, 180k tbc
  
  Stream #0:1: Audio: aac, 48000 Hz, stereo, fltp, 96 kb/s
  
  [OpenH264] this = 0x0000000019C126C0, Warning:Actual input framerate fAverageFrameRate = 0.000000 is quite different from framerate in setting 60.000000, please check setting or timestamp unit (ms), start_Ts = 0
  
  [OpenH264] this = 0x0000000019C126C0, Warning:Actual input framerate fAverageFrameRate = 0.000000 is quite different from framerate in setting 60.000000, please check setting or timestamp unit (ms), start_Ts = 0

  The output video file just plays black frames. Any hint or link to some doc would be appreciated. I have been trying to understand these errors but not too sure how to enable "skip frame" or why it is complaining about my input framerate (this is the same input as when I encode successfully with libx264)