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• Working with raw output from ffmpeg 'gdigrab' on Windows

  7 mars 2023, par jugglingcats

  I'm trying to capture high quality screen recording with the minimum CPU load (what we're recording is already CPU intensive and suffers slowdown if encoding is being done at the same time as screen recording).

  


  I'm using this command :

  


  ffmpeg -f gdigrab -t 00:00:05 -i desktop -pix_fmt yuv420p -vcodec copy -y testing.avi


  


  When I open this in Windows Media Player or VLC it sort of works. It's the right size and duration, but the pixels are messed up, as shown below.

  


  

  


  Ultimately I'd like to be able to re-encode this to something smaller, again using ffmpeg, but I can't find the right ffmpeg incantation/options for this given the raw input file generated by the first command.

  


• DFURTSP Player ffmpeg audio not working iOS

  14 janvier 2016, par MeghaJain

  I am using dfurtspplayer for video and audio streaming an ipcamera stream on my ios device. For reference : https://github.com/durfu/DFURTSPPlayer.
  It crashes with an error :
  malloc : * error for object 0x7ff513290007 : pointer being freed was not allocated
  * set a breakpoint in malloc_error_break to debug

  I think it crashes at av_free_packet(packet) in AudioStreamer.m
  I have everything to resolve it.The stream format i am using is rtsp.When i am playing a normal big bunny video from web its getting played fine but with actual camera stream it crashes.The codec it uses is "mulaw" in audiostreamer.m
  Anybody has a good luck with rtsp video and audio streaming in iOS ? Are there any other good libraries I can use ?

• why ffmpeg is not working in new installation

  3 août 2013, par Hitesh Gupta

  I was working on live encoding from FFmpeg from last few days. One day I re-installed my OS and tried to run FFmpeg commands again after configuration. My publish points get in starting but could not started. Why ? Am I missing any configuration required ?

  The command I am trying to run is :

  ffmpeg -y -re -i D:\video2.mp4 -pix_fmt yuv420p -movflags isml+frag_keyframe -f ismv -threads 0 -c:v libx264 -preset fast -profile:v baseline -map 0:v -b:v:0 800k http://localhost/PPS/PublishPoint.isml/Streams(Encode
  
  r1)

  Output what I got in command prompt is :

  ffmpeg version N-54772-g53c853e Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 16 2013 22:25:42 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 40.100 / 52. 40.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 81.101 /  3. 81.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\video2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.10.100
  
    Duration: 00:00:12.12, start: 0.072562, bitrate: 945 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 704x396 [
  
  SAR 1:1 DAR 16:9], 882 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 64
  
   kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [libx264 @ 00000000047e0860] using SAR=1/1
  
  [libx264 @ 00000000047e0860] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 00000000047e0860] profile Constrained Baseline, level 3.0
  
  [libx264 @ 00000000047e0860] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC cod
  
  ec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 r
  
  ef=2 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed
  
  _ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pski
  
  p=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 deci
  
  mate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyi
  
  nt=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=abr mbtree=1
  
   bitrate=800 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1
  
  :1.00
  
  Output #0, ismv, to 'http://localhost/My_SSMN_PPS/saturday.isml/Streams(Encoder1
  
  )':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.12.102
  
      Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 7
  
  04x396 [SAR 1:1 DAR 16:9], q=-1--1, 800 kb/s, 10000k tbn, 29.97 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame=   13 fps=0.0 q=0.0 size=       2kB time=00:00:00.00 bitrate=N/A dup=2 dro
  
  frame=   29 fps= 29 q=0.0 size=       2kB time=00:00:00.00 bitrate=N/A dup=2 dro
  
  av_interleaved_write_frame(): Unknown error

  Advanced Thanks.