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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 ?

  


• ffmpeg terminates without any output

  11 septembre 2012, par Khan

  I am using ffmpeg to convert a video file to mp4. here is my code

      echo "converting ".basename($src)." --- to --- ".basename($dest).".mp4...<br />";
  
  $command = FFMPEG.&#39; -i &#39; . $src . &#39; -sameq -strict -2 -vcodec libx264 -ar 22050 -y &#39; . $dest.&#39;.mp4 2>&amp;1&#39;;   //
  
  echo $command.&#39;<br />&#39;;
  
  
  
  exec($command,$output,$status);
  
  echo &#39;<pre>&#39;,join(&#39;<br />&#39;,$output),&#39;</pre><br />&#39;;
  
  
  
  if($status == 0) {              // Success
  
      echo &#39;Successfully converted to MP4!<br />&#39;;
  
  } else {
  
      echo $status."<br />failed<br />";
  
  } 

  The code works fine on my localhost (Windows 7 + wamp).. But on live server , only $command is echoed.. and script is terminated. The output file is generated but it is only 4.5MB (it should be around 17 MB) and not complete... and sometime I get the following output..

      ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers  built on Sep 10 2012 00:38:24 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)  configuration: --prefix=/home/one01qsc/local --extra-cflags='-L/home/one01qsc/local/lib/ -I /home/one01qsc/local/include/' --extra-ldflags='-L/home/one01qsc/local/lib/ -Wl,-rpath,/home/one01qsc/local/lib/' --enable-libmp3lame --enable-libvorbis --enable-shared --disable-yasm --enable-libtheora --enable-libx264 --enable-gpl
  
    libavutil      51. 54.100 / 51. 54.100
  
    libavcodec     54. 23.100 / 54. 23.100
  
    libavformat    54.  6.100 / 54.  6.100
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     2. 77.100 /  2. 77.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/one01qsc/public_html/temp/pending/1455-testing-mobidick.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2012-09-08 16:00:41
  
    Duration: 00:00:23.13, start: 0.490000, bitrate: 6028 kb/s
  
      Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 5331 kb/s, 29.97 fps, 29.97 tbr, 60k tbn, 59.94 tbc
  
      Metadata:
  
        creation_time   : 2012-09-08 16:00:41
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 192 kb/s
  
      Metadata:
  
        creation_time   : 2012-09-08 16:00:41
  
        handler_name    : Apple Alias Data Handler
  
  [buffer @ 0x2405ce0] w:1920 h:1080 pixfmt:yuv420p tb:1/60000 sar:0/1 sws_param:flags=2
  
  [buffersink @ 0x2429ec0] No opaque field provided
  
  [aformat @ 0x23fa560] auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
  
  [aresample @ 0x2402e60] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt r:22050Hz
  
  [libx264 @ 0x24288e0] using cpu capabilities: none!
  
  [libx264 @ 0x24288e0] profile High, level 4.0
  
  [libx264 @ 0x24288e0] 264 - core 128 - 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=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=24 lookahead_threads=4 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 '/home/one01qsc/public_html/temp/1455-testing-mobidick.mp4':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2012-09-08 16:00:41
  
      encoder         : Lavf54.6.100
  
      Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 1920x1080, q=-1--1, 30k tbn, 29.97 tbc
  
      Metadata:
  
        creation_time   : 2012-09-08 16:00:41
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1: Audio: aac (@[0][0][0] / 0x0040), 22050 Hz, stereo, flt, 128 kb/s
  
      Metadata:
  
        creation_time   : 2012-09-08 16:00:41
  
        handler_name    : Apple Alias Data Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> aac)
  
  Press [q] to stop, [?] for help
  
  frame=   18 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s

  the value printed for $status is 137 in this case.

  Any help is really appreciated.

• FFMPEG x264 MP4 Encoding all grey

  7 mars 2013, par Brianjs

  I am currently using FFMPEG v1.1 on CentOS 6.3.

  I configured FFMPEG with :

  ./configure --arch=x86_64  --enable-libmp3lame  --enable-librtmp  --enable-libtheora --enable-libvorbis  --enable-libx264 --enable-pthreads --enable-gpl --enable-runtime-cpudetect 

  when I run a simple command to record live input to MP4 by :

  ffmpeg -f video4linux2 -s 640x480 -i /dev/video0 /home/irdb/Desktop/test.mp4

  I get nothing, just a grey screen with some artifacts around the edges. However when I run the same command as .MPG it comes out fine. I need it in MP4 format however.

  On a side note I am running x264-0.120 installed through yum

  My question is, is there a problem with the way I compiled ffmpeg ? Or is it possibly something else ?

  edit :

  Output from example as requested :

  # ffmpeg -f video4linux2 -s 640x480 -t 5 -i /dev/video0 -strict 2 /home/irdb/Desktop/test.mp4
  
  ffmpeg version N-50546-g1f5b5b8 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Mar  7 2013 00:17:44 with gcc 4.4.6 (GCC) 20120305 (Red Hat 4.4.6-4)
  
  configuration: --enable-libmp3lame --enable-librtmp --enable-libtheora --enable-   libvorbis --enable-libx264 --enable-pthreads --enable-gpl --enable-runtime-cpudetect
  
  libavutil      52. 18.100 / 52. 18.100
  
  libavcodec     54. 92.100 / 54. 92.100
  
  libavformat    54. 63.104 / 54. 63.104
  
  libavdevice    54.  3.103 / 54.  3.103
  
  libavfilter     3. 42.103 /  3. 42.103
  
  libswscale      2.  2.100 /  2.  2.100
  
  libswresample   0. 17.102 /  0. 17.102
  
  libpostproc    52.  2.100 / 52.  2.100
  
  [video4linux2,v4l2 @ 0x3025120] Estimating duration from bitrate, this may be   inaccurate
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
  Duration: N/A, start: 128.640356, bitrate: 147456 kb/s
  
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  [libx264 @ 0x3026f80] using cpu capabilities: MMX2 SSE2Fast SSEMisalign LZCNT
  
  [libx264 @ 0x3026f80] profile High 4:2:2, level 3.0, 4:2:2 8-bit
  
  [libx264 @ 0x3026f80] 264 - core 130 r2274 c832fe9 - H.264/MPEG-4 AVC codec -  Copyleft 2003-2013 - 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 '/home/irdb/Desktop/test.mp4':
  
  Metadata:
  
  encoder         : Lavf54.63.104
  
  Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 15360 tbn, 30 tbc
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame=   32 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=21    drframe=   46 fps= 46 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=28 drframe=    62 fps= 41 q=29.0 size=      71kB time=00:00:00.33 bitrate=1735.2kbits/frame=   76 fps=  38 q=29.0 size=     169kB time=00:00:00.80 bitrate=1731.2kbits/frame=   93 fps= 37  q=29.0 size=     311kB time=00:00:01.36 bitrate=1862.3kbits/frame=  107 fps= 35 q=29.0  size=     423kB time=00:00:01.83 bitrate=1891.0kbits/frame=  123 fps= 35 q=29.0 size=      537kB time=00:00:02.36 bitrate=1860.2kbits/frame=  139 fps= 34 q=29.0 size=     664kB  time=00:00:02.90 bitrate=1876.0kbits/frame=  150 fps= 29 q=-1.0 Lsize=    1174kB  time=00:00:04.93 bitrate=1948.7kbits/s dup=81 drop=0    
  
  video:1172kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.133409%
  
  [libx264 @ 0x3026f80] frame I:2     Avg QP:23.22  size: 28460
  
  [libx264 @ 0x3026f80] frame P:136   Avg QP:24.45  size:  8397
  
  [libx264 @ 0x3026f80] frame B:12    Avg QP:26.18  size:    42
  
  [libx264 @ 0x3026f80] consecutive B-frames: 88.0%  4.0%  0.0%  8.0%
  
  [libx264 @ 0x3026f80] mb I  I16..4: 47.1% 28.8% 24.1%
  
  [libx264 @ 0x3026f80] mb P  I16..4:  4.3%  1.9%  1.2%  P16..4: 29.0% 11.4%  9.2%      0.0%  0.0%    skip:43.0%
  
  [libx264 @ 0x3026f80] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  1.5%  0.0%  0.0%   direct: 0.0%  skip:98.5%  L0:16.5% L1:83.5% BI: 0.0%
  
  [libx264 @ 0x3026f80] 8x8 transform intra:26.4% inter:30.7%
  
  [libx264 @ 0x3026f80] coded y,uvDC,uvAC intra: 85.2% 95.6% 83.5% inter: 10.9% 38.6% 24.0%
  
  [libx264 @ 0x3026f80] i16 v,h,dc,p: 33% 19% 40%  8%
  
  [libx264 @ 0x3026f80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 12% 55%  5%  3%  4%  4%  3%  8%
  
  [libx264 @ 0x3026f80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15%  9% 63%  3%  2%  2%  2%  2%  2%
  
  [libx264 @ 0x3026f80] i8c dc,h,v,p: 66% 11% 14%  9%
  
  [libx264 @ 0x3026f80] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x3026f80] ref P L0: 56.6%  7.5%  8.1% 27.8%
  
  [libx264 @ 0x3026f80] ref B L0: 83.3% 16.7%
  
  [libx264 @ 0x3026f80] ref B L1: 90.7%  9.3%
  
  [libx264 @ 0x3026f80] kb/s:1918.95