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• ffmpeg : Resource temporarily unavailable

  26 octobre 2015, par Cabbage soup

  I’m trying to run ffmpeg on a linux server (info from uname -a) :

  Linux comp32 2.6.32-279.14.1.el6.x86_64 #1 SMP Tue Nov 6 11:21:14 CST 2012 x86_64 x86_64 x86_64 GNU/Linux

  ffmpeg (together with the required encoders and decoders) compiles successfully on the system, but when I try to perform a basic operation like the following : ffmpeg -v debug -i example.m4v image%d.jpg, I get a slightly cryptic error message :

  ffmpeg version 2.8.1 Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 4.7.1 (GCC)
  
  configuration: --prefix=/users/albanie/local/usr
  
  libavutil      54. 31.100 / 54. 31.100
  
  libavcodec     56. 60.100 / 56. 60.100
  
  libavformat    56. 40.101 / 56. 40.101
  
  libavdevice    56.  4.100 / 56.  4.100
  
  libavfilter     5. 40.101 /  5. 40.101
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.101 /  1.  2.101
  
  Splitting the commandline.
  
  Reading option '-v' ... matched as option 'v' (set logging level) with argument 'debug'.
  
  Reading option '-i' ... matched as input file with argument 'example.m4v'.
  
  Reading option 'image%d.jpg' ... matched as output file.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option v (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file example.m4v.
  
  Successfully parsed a group of options.
  
  Opening an input file: example.m4v.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] ISO: File Type Major Brand: M4V
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] Before avformat_find_stream_info() pos: 185580655 bytes read:927102 seeks:1
  
  [h264 @ 0x2ee3720] no picture
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] After avformat_find_stream_info() pos: 24214 bytes read:959870 seeks:2 frames:3
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'example.m4v':
  
  Metadata:
  
    major_brand     : M4V
  
    minor_version   : 512
  
    compatible_brands: isomiso2avc1
  
    encoder         : Lavf56.25.101
  
  Duration: 00:13:47.93, start: 0.033333, bitrate: 1793 kb/s
  
  Stream #0:0(und), 2, 1/30000: Video: h264 (High), 4 reference frames (avc1 / 0x31637661), yuv420p(left), 720x576 [SAR 64:45 DAR 16:9], 1001/60000, 1656 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(eng), 1, 1/48000: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
  Metadata:
  
    handler_name    : SoundHandler
  
  Successfully opened the file.
  
  Parsing a group of options: output file image%d.jpg.
  
  Successfully parsed a group of options.
  
  Opening an output file: image%d.jpg.
  
  Successfully opened the file.
  
  detected 32 logical cores
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'video_size' to value '720x576'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'time_base' to value '1/30000'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'pixel_aspect' to value '64/45'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'frame_rate' to value '30000/1001'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] w:720 h:576 pixfmt:yuv420p tb:1/30000 fr:30000/1001 sar:64/45 sws_param:flags=2
  
  [format @ 0x2f750c0] compat: called with args=[yuvj420p|yuvj422p|yuvj444p]
  
  [format @ 0x2f750c0] Setting 'pix_fmts' to value 'yuvj420p|yuvj422p|yuvj444p'
  
  [auto-inserted scaler 0 @ 0x2f75f00] Setting 'flags' to value 'bicubic'
  
  [auto-inserted scaler 0 @ 0x2f75f00] w:iw h:ih flags:'bicubic' interl:0
  
  [format @ 0x2f750c0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [AVFilterGraph @ 0x303f720] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed
  
  [auto-inserted scaler 0 @ 0x2f75f00] picking yuvj420p out of 3 ref:yuv420p alpha:0
  
  [swscaler @ 0x2f664a0] deprecated pixel format used, make sure you did set range correctly
  
  [auto-inserted scaler 0 @ 0x2f75f00] w:720 h:576 fmt:yuv420p sar:64/45 -> w:720 h:576 fmt:yuvj420p sar:64/45 flags:0x4
  
  [mjpeg @ 0x2ee96c0] Forcing thread count to 1 for MJPEG encoding, use -thread_type slice or a constant quantizer if you want to use multiple cpu cores
  
  [mjpeg @ 0x2ee96c0] intra_quant_bias = 96 inter_quant_bias = 0
  
  Output #0, image2, to 'image%d.jpg':
  
  Metadata:
  
    major_brand     : M4V
  
    minor_version   : 512
  
    compatible_brands: isomiso2avc1
  
    encoder         : Lavf56.25.101
  
  Stream #0:0(und), 0, 1001/30000: Video: mjpeg, 1 reference frame, yuvj420p(pc, left), 720x576 [SAR 64:45 DAR 16:9], 1001/30000, q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
    encoder         : Lavc56.60.100 mjpeg
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  
  Error while opening decoder for input stream #0:0 : Resource temporarily unavailable
  
  [AVIOContext @ 0x2eeaee0] Statistics: 959870 bytes read, 2 seeks

  I also tried using a static build off ffmpeg, downloaded from here, but got the same resource temporarily unavailable message. Any ideas on how I might be able to fix this ?

• Revision 36038 : Améliorations diverses dont l’encodage

  10 mars 2010, par kent1@… — Log

  Améliorations diverses dont l’encodage

• How to compress gif effectively to reduce size ?

  12 avril 2021, par RSJ

  We use gifs for our blog extensively. We used to embed tenor nano gifs(90px height maintaining aspect ratio, used for GIF previews and shares on mobile) in it. Now we wanted to create our own gifs and are using the following command to convert mp4 to gif while maintaining the properties of tenor's nano gif. using ffmpeg version 4.1.4

  



  But we observed a huge difference in size between the gif we created and the one created using tenor.

  



  ffmpeg -i input.mp4 -filter_complex "[0:v]fps=10,scale=-1:90:flags=lanczos,split [a][b];[a] palettegen [p];[b][p] paletteuse" -y output.gif

  



  [Original MP4] - 845KB

  



  Tenor Nano gif - 42KB

  



  ffmpeg gif - 106KB

  



  We even tried changing dithering algorithm to further reduce size but it ended up adding noise and damaged the gif quality

  



  paletteuse=dither=bayer:bayer_scale=5:diff_mode=rectangle

  



  We tried tweaking colour quantization in gifsicle as well but it was of no use.

  



  gifsicle --resize _x90 --colors 256 --color-method diversity --dither=ordered --resize-method sample input.gif > output.gif