Newest 'ffmpeg' Questions - Stack Overflow

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• Shell Script - Issue while assigning command from shell script

  18 novembre 2013, par Simon

  I want to build a script for converting a set of .avi movies from a folder to .wmv movies by using the ffmpeg converter.

  My script has the following content :

  for file in *.avi
  do
  replace_string="wmw";
  new_file=${file/avi/$replace_string};
  #echo $new_file
  #echo $file
  ffmpeg -i $file -b:v 2500k /home/alin/WmvMovies/$new_file
  done
  

  However, it doesn't work. I receive the following error : [NULL @ 0x1849040] Unable to find a suitable output format for '/home/alin/WmvMovies/Teo_Pose90.wmw' /home/alin/WmvMovies/Teo_Pose90.wmw: Invalid argument

  However, if I try this independently, it works. If I introduce into shell the following command :

  ffmpeg -i Teo_Pose90.avi -b:v 2500k /home/alin/WmvMovies/Teo_Pose90.wmv
  

  Can someone please explain to me why do I get this behaviour?

• Android:where to store large arrays of frames before encoding ?

  18 novembre 2013, par yarin

  I am facing a programming problem

  I am trying to encode video from camera frames that I have merged with other frames which were retrieved from other layer(like bitmap/GLsurface)

  When I use 320X240 .I can make the merge in real time with fine FPS(~10),but when I try to increase the pixels size I am getting less than 6 FPS.
  It is sensible as my merging function depend on the pixels size.

  So what I ask is, how to store that Arrays of frames for after processing (encode)?

  I don't know how to store this large arrays.

  Just a quick calculation:
  If i need to store 10 frame per second
  and each frame is 960X720 pixel
  so i need to store for 40 second video : 40X10X960X720X(3/2-android factor)=~ 276 MB
  

  it is to much for heap

  any idea?

• Running ffmpeg through a website

  18 novembre 2013, par Andrew Simpson

  I have a website and it allows Users to download images as a video clip.

  They can choose from say mp4, avi, ogg etc.

  I use ffmpeg via the Process Class in C#/Asp.net 4.0 to execute the conversion tool.

  I have noticed in testing that if I forcefully abort this conversion like stopping IIS, ending the wp3 process in task manager) that after a while of doing this if I then look at task manager on the Web Server there are many instances of FFMPEG which have not closed down properly.

  What I would ideally like to do is kill any processes that maybe lingering for that SPECIFIC User (not any other Users/Session) and then start the conversion tool.

  Is it possible to manage/control the FFMPEG process for that User/Session or should I be looking at a queuing system that enables only 1 User at 1 time should be able to use this conversion tool?

  I hope I made this sound clear?

  I could post the code that shows how the Process/ffmpeg is started in C# but I cannot see how this would aid this question.

  Thanks

• ffmpeg : unsync audio after processing

  18 novembre 2013, par QuickSilver

  I am recording a video and using RecordRTC: WebRTC . After receiving the webm video and wav audio at server, I'm encoding it to a mp4 file using ffmpeg(executing shell command via php). But after encoding process, the audio is unsync with video (audio ends before video). How can I fix this?

  js code is here

  ffmpeg command used is :

  ffmpeg -y -i 166890589.wav -i 166890589.webm -vcodec libx264 166890589.mp4
  

  Console output:

  ffmpeg version 0.8.9-6:0.8.9-0ubuntu0.13.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Nov  9 2013 19:15:52 with gcc 4.7.3
  *** THIS PROGRAM IS DEPRECATED ***
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  [wav @ 0x81caa60] max_analyze_duration reached
  Input #0, wav, from '166890589.wav':
    Duration: 00:00:07.05, bitrate: 1411 kb/s
      Stream #0.0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
  [matroska,webm @ 0x823c340] Unknown entry 0x63C5
  [matroska,webm @ 0x823c340] Estimating duration from bitrate, this may be inaccurate
  
  Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 10.00 (10/1)
  Input #1, matroska,webm, from '166890589.webm':
    Duration: 00:00:08.40, start: 0.000000, bitrate: N/A
      Stream #1.0: Video: vp8, yuv420p, 320x240, PAR 1:1 DAR 4:3, 10 tbr, 1k tbn, 1k tbc (default)
  [buffer @ 0x8245620] w:320 h:240 pixfmt:yuv420p
  [libx264 @ 0x82618a0] using SAR=1/1
  [libx264 @ 0x82618a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  [libx264 @ 0x82618a0] profile Main, level 1.1
  [libx264 @ 0x82618a0] 264 - core 123 r2189 35cf912 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=0 b_adapt=1 b_bias=0 direct=1 weightb=0 open_gop=1 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.25 aq=1:1.00
  Output #0, mp4, to '166890589.mp4':
    Metadata:
      encoder         : Lavf53.21.1
      Stream #0.0: Video: libx264, yuv420p, 320x240 [PAR 1:1 DAR 4:3], q=-1--1, 10 tbn, 10 tbc (default)
      Stream #0.1: Audio: libvo_aacenc, 44100 Hz, 2 channels, s16, 200 kb/s
  Stream mapping:
    Stream #1.0 -> #0.0
    Stream #0.0 -> #0.1
  Press ctrl-c to stop encoding
  frame=   84 fps=  0 q=25.0 Lsize=     260kB time=7.06 bitrate= 301.3kbits/s    
  video:83kB audio:172kB global headers:0kB muxing overhead 1.783102%
  frame I:1     Avg QP:17.52  size:  6554
  [libx264 @ 0x82618a0] frame P:41    Avg QP:19.07  size:  1555
  [libx264 @ 0x82618a0] frame B:42    Avg QP:20.01  size:   325
  [libx264 @ 0x82618a0] consecutive B-frames: 33.3%  0.0%  0.0% 66.7%
  [libx264 @ 0x82618a0] mb I  I16..4: 36.7%  0.0% 63.3%
  [libx264 @ 0x82618a0] mb P  I16..4:  3.8%  0.0%  5.0%  P16..4: 34.3%  9.8%  7.1%  0.0%  0.0%    skip:40.0%
  [libx264 @ 0x82618a0] mb B  I16..4:  1.4%  0.0%  0.1%  B16..8: 37.5%  5.5%  0.4%  direct: 2.5%  skip:52.5%  L0:41.4% L1:51.5% BI: 7.2%
  [libx264 @ 0x82618a0] coded y,uvDC,uvAC intra: 40.7% 76.2% 26.8% inter: 10.9% 22.5% 2.7%
  [libx264 @ 0x82618a0] i16 v,h,dc,p: 28% 34% 23% 15%
  [libx264 @ 0x82618a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 28% 21%  3%  4%  4%  5%  3%  3%
  [libx264 @ 0x82618a0] i8c dc,h,v,p: 49% 20% 26%  4%
  [libx264 @ 0x82618a0] Weighted P-Frames: Y:0.0% UV:0.0%
  [libx264 @ 0x82618a0] ref P L0: 62.7%  4.6% 16.3% 16.4%
  [libx264 @ 0x82618a0] ref B L0: 79.0% 21.0%
  [libx264 @ 0x82618a0] kb/s:80.00
  

• Improve FFmpeg/avconv load and speed ?

  18 novembre 2013, par Rahul Jodhani

  when i convert video through ffmpeg/avconv it's take above 95% percentage, is there any way to reduce the converting time?

  Thanks in advanced.