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• FFMPEG : webm to mp4 quality loss

  11 février, par turboLoop

  When trying to convert a .webm video (two colored animation) to a .mp4 video using ffmpeg (3.4.2 on mac) the result is somewhat blurry. I did research this topic and tried different approaches to solve this. Here is the most promising command :

  



  ffmpeg -i vidoe.webm -qscale 1 video.mp4


  



  However, the quality change is still tremendous, see the difference below.

  



  webm

  



  

  



  mp4

  



  

  



  The resolution of the two videos is the same, however the size dropped from 24,3MB (.webm) to 1,5MB (.mp4) after conversion.

  



  Update

  



  Here is the log of the conversion.

  



  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, matroska,webm, from 'video.webm':
  Metadata:
    encoder         : whammy
  Duration: 00:00:05.02, start: 0.000000, bitrate: 38755 kb/s
    Stream #0:0: Video: vp8, yuv420p(progressive), 1920x1080, SAR 1:1 DAR 16:9, 60 fps, 60 tbr, 1k tbn, 1k tbc (default)
Please use -q:a or -q:v, -qscale is ambiguous
Stream mapping:
  Stream #0:0 -> #0:0 (vp8 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x7f8625800c00] -qscale is ignored, -crf is recommended.
[libx264 @ 0x7f8625800c00] using SAR=1/1
[libx264 @ 0x7f8625800c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7f8625800c00] profile High, level 4.2
[libx264 @ 0x7f8625800c00] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 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=1.40 aq=1:1.00
Output #0, mp4, to 'video.mp4':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 60 fps, 15360 tbn, 60 tbc (default)
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=  301 fps= 45 q=-1.0 Lsize=    1417kB time=00:00:04.96 bitrate=2336.4kbits/s speed=0.735x    
video:1412kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.309675%
[libx264 @ 0x7f8625800c00] frame I:2     Avg QP:13.08  size:  8842
[libx264 @ 0x7f8625800c00] frame P:75    Avg QP:24.29  size:  6785
[libx264 @ 0x7f8625800c00] frame B:224   Avg QP:26.38  size:  4102
[libx264 @ 0x7f8625800c00] consecutive B-frames:  0.7%  0.0%  1.0% 98.3%
[libx264 @ 0x7f8625800c00] mb I  I16..4: 68.1% 28.7%  3.2%
[libx264 @ 0x7f8625800c00] mb P  I16..4:  0.1%  2.2%  0.4%  P16..4:  6.5%  4.0%  1.4%  0.0%  0.0%    skip:85.4%
[libx264 @ 0x7f8625800c00] mb B  I16..4:  0.0%  0.2%  0.0%  B16..8:  8.8%  3.0%  0.3%  direct: 0.3%  skip:87.3%  L0:52.1% L1:47.5% BI: 0.4%
[libx264 @ 0x7f8625800c00] 8x8 transform intra:57.7% inter:67.8%
[libx264 @ 0x7f8625800c00] coded y,uvDC,uvAC intra: 25.7% 8.7% 0.9% inter: 3.9% 0.4% 0.0%
[libx264 @ 0x7f8625800c00] i16 v,h,dc,p: 95%  2%  3%  0%
[libx264 @ 0x7f8625800c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17%  5% 48%  5%  7%  6%  5%  4%  3%
[libx264 @ 0x7f8625800c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 14% 31%  6%  7%  7%  6%  5%  4%
[libx264 @ 0x7f8625800c00] i8c dc,h,v,p: 88%  6%  6%  0%
[libx264 @ 0x7f8625800c00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7f8625800c00] ref P L0: 55.3%  5.5% 24.8% 14.5%
[libx264 @ 0x7f8625800c00] ref B L0: 75.6% 16.7%  7.7%
[libx264 @ 0x7f8625800c00] ref B L1: 93.9%  6.1%
[libx264 @ 0x7f8625800c00] kb/s:2304.86


  



  Any idea on how to overcome this quality loss ?

  


• video thumbnail using FFMPEG on lambda (spawn error)

  21 mars 2018, par sitara hussain

  i am following the tutorial given on
  https://concrete5.co.jp/blog/creating-video-thumbnails-aws-lambda-your-s3-bucket
  all setup is done according to the given instruction. but after deployment i am having following error on

  2018-03-21T14:59:27.202Z    73134e6f-2d18-11e8-a66f-5d8b49ac5731    { Error: spawn EACCES
  
  at exports._errnoException (util.js:1018:11)
  
  at ChildProcess.spawn (internal/child_process.js:319:11)
  
  at Object.exports.spawn (child_process.js:378:9)
  
  at createThumbnail (/var/task/index.js:66:36)
  
  at nextTask (/var/task/node_modules/async/dist/async.js:5310:14)
  
  at next (/var/task/node_modules/async/dist/async.js:5317:9)
  
  at /var/task/node_modules/async/dist/async.js:958:16
  
  at /var/task/index.js:55:9
  
  at process._tickDomainCallback (internal/process/next_tick.js:135:7) code: 'EACCES', errno: 'EACCES', syscall: 'spawn' }

• creating a video using ffmpeg command with image name pattern [duplicate]

  21 mars 2018, par Junaid Farooq

  This question already has an answer here :

  • ffmpeg img to video = Could find no file with path
    
    2 answers
    

  I am coming from this question
  https://askubuntu.com/questions/610903/how-can-i-create-a-video-file-from-a-set-of-jpg-images

  Everything is working fine and I can create a video, I am only struggling with the image name pattern. Each time, I had to rename all files first to a specific pattern.

  Can we create a video using the same command written below but with this kind of image name pattern ?

  2018-01-19-11-55-00.jpg  2018-01-19-17-00-00.jpg  2018-01-22-10-10-00.jpg  2018-01-22-13-25-00.jpg  2018-01-22-16-40-00.jpg
  
  2018-01-19-12-00-00.jpg  2018-01-19-17-05-00.jpg  2018-01-22-10-15-00.jpg  2018-01-22-13-30-00.jpg  2018-01-22-16-45-00.jpg

  I want to use this command

  ffmpeg -framerate 25 -i image-%04d.jpg -c:v libx264 -profile:v high -crf 20 -pix_fmt yuv420p output.mp4

  but this one using

  image-2000.jpg  image-2400.jpg  image-2800.jpg

  above image pattern.

  Is there any possibility to use the above pattern of files which are being named as a date. also, all these images are in a folder. Can FFMPEG address them ?