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• FFMPEG real-time buffer full frame dropped

  27 janvier 2015, par Burgaz

  I’m using FFMPEG on windows with direct show.
  I’m streaming RTMP (command below) and i need very low latency.
  Once run I get the following errors : [dshow @ 024ce800] real-time buffer 204% full ! frame dropped !

  ffmpeg -threads 6 -f dshow -i video=UScreenCapture -s 1920x1080 -an -vco
  dec libx264 -x264opts keyint=25:min-keyint=20 -b:v 1024k -preset ultrafast -tune zerolatency -crf 22 -r 10 -pix_fmt yuv420p -f flv rtmp ://server...

  Do you have an idea how to handle this kind of error ?

  Thanks
  Ronen

• Unable to convert .mp3 to .m4a using ffmpeg [closed]

  4 mai 2013, par rahulg

  I am fully aware the legal constraints in using libfaac but this is just for my testing purpose.

  I have compiled ffmpeg with faac enabled. So when I tried to convert an .mp3 to a .m4a here is the error that I am getting. Please provide a resolution to this problem. I tried it on two different sources of .mp3, still I am getting the same error.

  [user@ip-10-161-13-26 ~]$ ffmpeg  -i Kalimba.mp3 -c:a libfaac Kalimba.m4a
  
  ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on May  4 2013 09:33:27 with gcc 4.4.6 20120305 (Red Hat 4.4.6-4)
  
    configuration: --enable-libfaac --enable-nonfree --disable-yasm
  
    libavutil      51. 54.100 / 51. 54.100
  
    libavcodec     54. 23.100 / 54. 23.100
  
    libavformat    54.  6.100 / 54.  6.100
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     2. 77.100 /  2. 77.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
  [mp3 @ 0x2464680] Header missing
  
  [mp3 @ 0x2463100] max_analyze_duration 5000000 reached at 5015510
  
  [mp3 @ 0x2463100] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'Kalimba.mp3':
  
    Metadata:
  
      publisher       : Ninja Tune
  
      track           : 1
  
      album           : Ninja Tuna
  
      artist          : Mr. Scruff
  
      album_artist    : Mr. Scruff
  
      title           : Kalimba
  
      genre           : Electronic
  
      composer        : A. Carthy and A. Kingslow
  
      date            : 2008
  
    Duration: 00:05:50.60, start: 0.000000, bitrate: 191 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16, 192 kb/s
  
      Stream #0:1: Video: mjpeg, yuvj420p, 512x512, 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        title           : thumbnail
  
        comment         : Cover (front)
  
  Output #0, ipod, to 'Kalimba.m4a':
  
    Metadata:
  
      publisher       : Ninja Tune
  
      track           : 1
  
      album           : Ninja Tuna
  
      artist          : Mr. Scruff
  
      album_artist    : Mr. Scruff
  
      title           : Kalimba
  
      genre           : Electronic
  
      composer        : A. Carthy and A. Kingslow
  
      date            : 2008
  
      Stream #0:0: Video: none, q=2-31, 128 kb/s, 90k tbn
  
      Metadata:
  
        title           : thumbnail
  
        comment         : Cover (front)
  
      Stream #0:1: Audio: none, 0 channels, 128 kb/s
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (mjpeg -> ?)
  
    Stream #0:0 -> #0:1 (mp3 -> libfaac)
  
  Encoder (codec none) not found for output stream #0:0

  MP3 file is at http://db.tt/HtpEBpFU

  Also while using Faac independently I get this weird error for any file.

  Freeware Advanced Audio Coder
  
  FAAC 1.28
  
  
  
  Couldn't open input file sample.mp3

• Reducing the bit rate is dropping the audio stream [closed]

  19 février 2013, par user977505

  I'm a newbie to the ffmpeg, x264 commands and conversion. So please bear w/ me.

  I've a H.264 content w/ very high bit rate and I'm using ffmepg, x264 commands to reduce the bit rate. The bit rate is getting reduced but the problem is the output doesn't have the audio stream anymore.

  Here are the commands, I'm using :

  ffmpeg.exe  -i King_Maker_Leader.mp4 -pix_fmt yuv420p -vf scale=1024:576 -r 24 \
    -f yuv4mpegpipe - | x264.exe  —bitrate 1664 —demuxer y4m \
    —preset slow —ref 3 —threads 6 —thread-input —no-scenecut \
    —no-interlaced —stats King_Maker_Leader.stats —vbv-bufsize 3328000 \
    —vbv-maxrate 1996 —pass 1 —output NUL —profile main —level 3.1 —sar 1:1 \
    —tune film —keyint 96 -
  ffmpeg.exe  -i King_Maker_Leader.mp4 -pix_fmt yuv420p -vf scale=1024:576 \
  
    -r 24 -f yuv4mpegpipe - | x264.exe  —bitrate 1664 —demuxer y4m \
  
    —preset slow —ref 3 —threads 6 —thread-input —no-scenecut \
  
    —no-interlaced —stats King_Maker_Leader.stats —vbv-bufsize 3328000 \
  
    —vbv-maxrate 1996 —pass 2 —output King_Maker_Leader_generated.mp4 \
  
    —profile main —level 3.1 —sar 1:1 —tune film —keyint 96 -
  

  I cannot figure out what is wrong with the above commands.

  I'm attaching the partial logs from pass 2 command that show the input has two streams (video and audio) and the output has only video stream.

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '..\yathrakkarude_sathruka.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.6.101
  
    Duration: 00:01:00.37, start: 0.000000, bitrate: 8587 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x576 [
  
  SAR 16:11 DAR 20:11], 8073 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 508
  
   kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, yuv4mpegpipe, to 'pipe:':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.25.104
  
      Stream #0:0(eng): Video: rawvideo (I420 / 0x30323449), yuv420p, 1024x576 [SA
  
  R 45:44 DAR 20:11], q=2-31, 200 kb/s, 90k tbn, 24 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> rawvideo)
  
  Press [q] to stop, [?] for help
  
  [yuv4mpegpipe @ 016d5800] Encoder did not produce proper pts, making some up.
  
  y4m [info]: 1024x576p 45:44 @ 24/1 fps (cfr)
  
  x264 [info]: using SAR=1/1
  
  x264 [warning]: VBV buffer (2000000) > level limit (14000)
  
  x264 [info]: using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT