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• ffmpeg.autogen ffmpeg.avformat_write_header(ofmt_ctx, null) error -22

  17 mai 2019, par errod1

  Error when writing the file header, when copying a video streaming to an mp4 file, when the source is a file it executes without errors, but when it is a url type rtmp: // it gives error -22

  C# Visual2015 ffmpeg.autogen 4.1.0.4

• An error occured 'maybe incorrect parameters such as bit_rate, rate, width or height' when I encode my video

  17 mai 2019, par Crystal

  I always use this source code when I encode my videos. they are almost 1920x1080 videos. but An error occured when I tried to encode a 7680x3840 video.

      ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
      built with gcc 5.4.0 (GCC)
      configuration: --enable-gpl --enable-version3 --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
      libavutil      55. 34.100 / 55. 34.100
      libavcodec     57. 64.101 / 57. 64.101
      libavformat    57. 56.100 / 57. 56.100
      libavdevice    57.  1.100 / 57.  1.100
      libavfilter     6. 65.100 /  6. 65.100
      libswscale      4.  2.100 /  4.  2.100
      libswresample   2.  3.100 /  2.  3.100
      libpostproc    54.  1.100 / 54.  1.100
      [avisynth @ 03af8040] Stream #0: not enough frames to estimate rate; consider increasing probesize
      Guessed Channel Layout for Input Stream #0.1 : stereo
      Input #0, avisynth, from 'a.mp4.avs':
      Duration: 00:00:01.85, start: 0.000000, bitrate: 2 kb/s
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 7680x3840, 60 fps, 60 tbr, 60 tbn, 60 tbc
      Stream #0:1: Audio: pcm_f32le, 48000 Hz, stereo, flt, 3072 kb/s
      [libx264 @ 054c5c20] VBV maxrate specified, but no bufsize, ignored
      [libx264 @ 054c5c20] frame MB size (480x240) > level limit (8192)
      [libx264 @ 054c5c20] DPB size (4 frames, 460800 mbs) > level limit (0 frames, 32768 mbs)
      [libx264 @ 054c5c20] MB rate (6912000) > level limit (245760)
      [libx264 @ 054c5c20] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
      x264 [error]: malloc of size 152432416 failed
      Stream mapping:
      Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
      Stream #0:1 -> #0:1 (pcm_f32le (native) -> aac (native))
      Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  there is a strange message. 'malloc of size 152432416 failed' I think this is memory problem but I have no idea to solve this problem.

  This is avs file

      PluginPath = "D:\Application\Frame_Doubling_Set_Drag_And_Drop\ffmpeg-Convert-TrueMotion-x86_Newer_Svpflow\_exe\"
  
      LoadPlugin(PluginPath + "ffms2.dll")
      LoadPlugin(PluginPath + "svpflow1.dll")
      LoadPlugin(PluginPath + "svpflow2.dll")
      LoadPlugin(PluginPath + "mvtools2.dll")
  
      Video=FFVideoSource("a.mp4", threads=8) 
      Audio=FFAudioSource("a.mp4")
      Audiodub(Video, Audio)
  
      Import(PluginPath + "InterFrame2.avsi")
  
      InterFrame(GPU=true, Preset="Medium", FrameDouble=true, NewNum=60000, NewDen=1000, Cores=8)

  and this is batch file

      @echo off
  
      CD /D "%~dp1"
      cls
  
      set DestPath=%~dp1
  
      set Src0=%~nx1
      set Src1=%~n1
  
      set DestExt=.mp4
  
      set Dest0=%DestPath%\%Src1%-Cnv%DestExt%
      set Dest1=%DestPath%\%Src1%-Cnv-New%DestExt%
  
      set exe=%~dp0_exe\ffmpeg.exe
      set Opt1=-i
      set Opt2=-c:v libx264 -b:v 200000k -minrate 10k -maxrate 200000k -profile:v high -level 4.1 -pix_fmt yuv420p
      set Opt3=-c:a aac -ab 192k
      set Opt4=-f mp4
  
      If Not Exist "%Src0%" (echo. && echo  [ %Src0% ] Not Found. && echo. && pause && Goto End)
  
      If Exist "%Dest0%" set Dest0=%Dest1%
  
      "%exe%" %Opt1% "%Src0%" %Opt2% %Opt3% %Opt4% "%Dest0%"
  
      :End
      If Not Exist "%Dest0%" (echo. && pause)
      rem pause
      pause

  What's my problem?

• Terminating FFMPEG from Python using Linux

  17 mai 2019, par smartzer

  So I have a project that listens for button inputs in Python, and records video from a camera and an external microphone once a certain button is pressed, now when I want to stop recording, I press another button and stop recording on my camera and the microphone, and then I call ffmpeg using the subprocess module:

  mergeFiles = subprocess.Popen("sudo ffmpeg -i /home/pi/Video/video.mov -i /home/pi/Audio/test.wav -acodec copy -vcodec copy -map 0:v -map 1:a -shortest /media/pi/USB/Output/output.mkv", shell=True)
  

  to merge the audio and video files I just created.

  Now once I call ffmpeg, it doesn't stop until I send the process a signal interrupt from the keyboard... is there a way to either have the process stop as soon as it's done merging, or to automatically terminate/kill ffmpeg after a certain amount of time?

  I have read up on other posts like this and none of the solutions work for me. I can't kill the process using the PID because every time I look up ffmpeg's PID, it is a different ID, and calling something like mergeFiles.kill() doesn't work for me.

• Meaning of "ffprobe -v trace demo.mp4" output

  17 mai 2019, par bluesky

  The 'mdat box' of Mp4 file may at the last of file. I want to know the position of 'mdat' box using 'ffmpeg' or 'ffprobe'.

  Mp4 consists of 'ftyp', 'moov' and 'mdat' BOX. each BOX consists of "BoxHeader" and "BoxData". "BoxHeader" consists of "BoxSize(4Byte)", "BoxType(4Byte)", "BoxLargesize(8Byte, only have when box size exceeding the range of 4Byte expression, then the value of BoxSize is 1)".

  In program, you could first read 8 Byte and know the size of 'ftyp box', then seek the size and read 8 Byte to know if the next box is 'moov box'. If not 'moov', it shoud be 'mdat box', then seek cross 'mdat box' to find 'mdat box'...

  But I want to use 'ffprobe' to find the position of 'moov'. I use 'ffprobe -v trace demo.mp4', and output is like below

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc8fd000e00] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc8fd000e00] type:'ftyp' parent:'root' sz: 28 8 41044500
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc8fd000e00] ISO: File Type Major Brand: mp42
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc8fd000e00] type:'moov' parent:'root' sz: 17943 36 41044500
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc8fd000e00] type:'mvhd' parent:'moov' sz: 108 8 17935
  

  I want to know the meaning of type:'ftyp' parent:'root' sz: 28 8 41044500: type:'ftyp' parent:'root'is easy to know, sz: 28 8 41044500 is really make me confused, I guess 28 is size of ftyp box,but the meaning of 8 41044500 is what?

  Could you explain the meaning of sz: 28 8 41044500, and where could find the doc?

• FFMPEG : Add a offset in the Scene Change Detection

  17 mai 2019, par steph

  I am trying to add a frame offset(o) in ffmpeg scene detection filter:

  For example: ...filter:v "select='gt(scene,X) generates frame 10, 34, 300.

  I looking for a new construction with o=10 generates frame 20, 44, 310...

  Thank you for help!