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Sur d’autres sites (9356)

  • How to fix grainy recoding with ffmpeg mp4 x264 ?

    21 mars 2020, par teenserie

    I recorded the audio and video stream from a streaming with ffmpeg. when I go to re-encode the file using libx264, the video in the movements looks bad and grainy as in the image.
Where did I go wrong ?

    



    Sample

    



    this is the code I used

    



    ffmpeg -i input.mp4 -c:v libx264 -c:a aac output.mp4


    



    and these are mediainfo of original file

    



        Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isom
    creation_time   : 2020-03-19T22:43:32.000000Z
  Duration: 00:39:51.99, start: 0.000000, bitrate: 1300 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x1080 [SAR 3:2 DAR 16:9], Closed Captions, 1268 kb/s, 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


    



    mediainfo of the file recoded

    



     Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:39:51.99, start: 0.000000, bitrate: 7924 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 7892 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


    



    How can I recode the file without loss of quality ? (sorry for my poor english)

    


  • How to fix grainy recoding with ffmpeg mp4 x264 ?

    21 mars 2020, par teenserie

    I recorded the audio and video stream from a streaming with ffmpeg. when I go to re-encode the file using libx264, the video in the movements looks bad and grainy as in the image.
    Where did I go wrong ?

    Sample

    this is the code I used

    ffmpeg -i input.mp4 -c:v libx264 -c:a aac output.mp4

    and these are mediainfo of original file

        Metadata:
    
    major_brand     : isom
    
    minor_version   : 1
    
    compatible_brands: isom
    
    creation_time   : 2020-03-19T22:43:32.000000Z
    
  Duration: 00:39:51.99, start: 0.000000, bitrate: 1300 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x1080 [SAR 3:2 DAR 16:9], Closed Captions, 1268 kb/s, 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler

    mediainfo of the file recoded

     Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.29.100
    
  Duration: 00:39:51.99, start: 0.000000, bitrate: 7924 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 7892 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler

    How can I recode the file without loss of quality ? (sorry for my poor english)

  • Combining three or more videos with ffmpeg and the xfade filter

    25 février 2021, par sil

    As of 2020 ffmpeg has the xfade filter which can combine videos with a transition. Combining two videos is easy enough :

    


    ffmpeg -i vid1.mp4 -i vid2.mp4 \
  -filter_complex [0][1]xfade=transition=pixelize:duration=1:offset=4,format=yuv420p" \
  out.mp4


    


    But I don't understand how to combine three videos (so that v1 fades into v2 and v2 then fades into v3. I tried something like this :

    


    ffmpeg -i vid1.mp4 -i vid2.mp4 -i vid3.mp4 \
  -filter_complex [0][1]xfade=transition=pixelize:duration=1:offset=4,format=yuv420p[0n1];[0n1][2]xfade=transition=pixelize:duration=1:offset=9,format=yuv420p" \
  out.mp4


    


    but that doesn't work. My idea was that 0 and 1, or vid1 and vid2, would be combined into a [0n1] stream with a transition by xfade, and then that 0n1 stream could be combined with vid3 with another filter. As far as I can tell, this includes the first two videos but not the third. What this of course means is that I don't understand how to specify a filtergraph correctly !

    


    How should I use xfade to combine 3 or more videos with transitions between them ?

    


    A full example is as follows. Here I'll use three images (because then issues with combining videos at different frame rates are avoided), and smash them all to 500x500 for ease (in the final version they would be letterboxed to keep resolution and so on).

    


    ffmpeg \
  -loop 1 -t 5 -i tests/p1.jpg \
  -loop 1 -t 5 -i tests/p2.jpg \
  -loop 1 -t 5 -i tests/p3.jpg \
  -filter_complex "[0]scale=500:500[s0];[1]scale=500:500[s1];[2]scale=500:500[s2];[s0][s1]xfade=transition=pixelize:duration=1:offset=4,format=yuv420p[s01];[s01][s2]xfade=transition=pixelize:duration=1:offset=9,format=yuv420p" out.mp4


    


    I would expect this to create a video which was :

    


      

    • 4 seconds of p1.jpg

      • 


    • a pixelise transition into p2.jpg lasting 1 second

      • 


    • 4 seconds of p2.jpg

      • 


    • a pixelise transition into p3.jpg lasting 1 second

      • 


    • 4 seconds of p3.jpg

      • 


    


    but what I actually get is

    


      

    • 4 seconds of p1.jpg

      • 


    • a pixelise transition into p2.jpg lasting 1 second

      • 


    • 4 seconds of p2.jpg

      • 


    


    and then the video ends. p3 is not included at all.

    


    The output is as follows :

    


    ffmpeg version N-53546-g5eb4405fc5-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      56. 56.100 / 56. 56.100
  libavcodec     58. 97.100 / 58. 97.100
  libavformat    58. 49.100 / 58. 49.100
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, image2, from 'tests/p1.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 44845 kb/s
    Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 820x1270 [SAR 150:150 DAR 82:127], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #1, image2, from 'tests/p2.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 22325 kb/s
    Stream #1:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 960x600 [SAR 1:1 DAR 8:5], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #2, image2, from 'tests/p3.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 15266 kb/s
    Stream #2:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 728x669 [SAR 96:96 DAR 728:669], 25 fps, 25 tbr, 25 tbn, 25 tbc
File 'out.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 (mjpeg) -> scale
  Stream #1:0 (mjpeg) -> scale
  Stream #2:0 (mjpeg) -> scale
  format -> Stream #0:0 (libx264)
Press [q] to stop, [?] for help
[swscaler @ 0x8228040] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x8258640] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x827df40] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x829f800] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x82c13c0] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x82e8340] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x77b7600] using SAR=82/127
[libx264 @ 0x77b7600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x77b7600] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 0x77b7600] 264 - core 161 r3018 db0d417 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - 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 'out.mp4':
  Metadata:
    encoder         : Lavf58.49.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 500x500 [SAR 82:127 DAR 82:127], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      encoder         : Lavc58.97.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=  101 fps=100 q=28.0 size=       0kB time=00:00:01.92 bitrate=   0.2kbits/s speed=[swscaler @ 0x8291d80] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 2 times
[swscaler @ 0x82b3000] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 2 times
[swscaler @ 0x82fc200] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 2 times
frame=  153 fps=101 q=28.0 size=       0kB time=00:00:04.00 bitrate=   0.1kbits/s speed=[swscaler @ 0x82fc200] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 2 times
frame=  225 fps=111 q=28.0 size=     256kB time=00:00:06.88 bitrate= 304.9kbits/s dup=0 frame=  225 fps= 95 q=-1.0 Lsize=     267kB time=00:00:08.88 bitrate= 245.9kbits/s dup=0 drop=125 speed=3.74x    
video:263kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.293847%
[libx264 @ 0x77b7600] frame I:2     Avg QP:21.03  size: 19928
[libx264 @ 0x77b7600] frame P:66    Avg QP:21.18  size:  2453
[libx264 @ 0x77b7600] frame B:157   Avg QP:29.72  size:   427
[libx264 @ 0x77b7600] consecutive B-frames:  5.3%  4.4%  1.3% 88.9%
[libx264 @ 0x77b7600] mb I  I16..4: 29.0% 27.8% 43.2%
[libx264 @ 0x77b7600] mb P  I16..4: 10.8%  3.2%  7.5%  P16..4:  2.6%  0.9%  0.3%  0.0%  0.0%    skip:74.8%
[libx264 @ 0x77b7600] mb B  I16..4:  1.1%  0.5%  1.6%  B16..8:  1.0%  0.5%  0.1%  direct: 0.3%  skip:94.9%  L0:37.4% L1:43.5% BI:19.1%
[libx264 @ 0x77b7600] 8x8 transform intra:16.5% inter:55.3%
[libx264 @ 0x77b7600] coded y,uvDC,uvAC intra: 31.4% 71.7% 31.8% inter: 1.1% 1.4% 0.1%
[libx264 @ 0x77b7600] i16 v,h,dc,p: 45% 46%  9%  1%
[libx264 @ 0x77b7600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 30% 27%  6%  1%  1%  2%  1%  7%
[libx264 @ 0x77b7600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 56% 31%  9%  1%  1%  1%  1%  1%  1%
[libx264 @ 0x77b7600] i8c dc,h,v,p: 46% 27% 23%  4%
[libx264 @ 0x77b7600] Weighted P-Frames: Y:10.6% UV:7.6%
[libx264 @ 0x77b7600] ref P L0: 61.9% 17.1% 13.9%  6.8%  0.3%
[libx264 @ 0x77b7600] ref B L0: 76.3% 22.8%  0.9%
[libx264 @ 0x77b7600] ref B L1: 97.6%  2.4%
[libx264 @ 0x77b7600] kb/s:238.88


    


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