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• How to resize dimensions of video through ffmpeg-python ?

  25 janvier, par kunambi

  I'm trying to resize a video file which a user has uploaded to Django, by using ffmpeg-python. The documentation isn't very easy to understand, so I've tried to cobble this together from various sources.

  


  This method is run in a celery container, in order to not slow the experience for the user. The problem I'm facing is that I can't seem to resize the video file. I've tried two different approaches :

  


  from django.db import models
from io import BytesIO
from myapp.models import MediaModel


def resize_video(mypk: str) -> None:
    instance = MediaModel.objects.get(pk=mypk)
    media_instance: models.FileField = instance.media
    media_output = "test.mp4"
    buffer = BytesIO()

    for chunk in media_instance.chunks():
        buffer.write(chunk)

    stream_video = ffmpeg.input("pipe:").video.filter("scale", 720, -1)  # resize to 720px width
    stream_audio = ffmpeg.input("pipe:").audio
    process = (
        ffmpeg.output(stream_video, stream_audio, media_output, acodec="aac")
        .overwrite_output()
        .run_async(pipe_stdin=True, quiet=True)
    )
    buffer.seek(0)
    process_out, process_err = process.communicate(input=buffer.getbuffer())
    # (pdb) process_out
    # b''

    # attempting to use `.concat` instead
    process2 = (
        ffmpeg.concat(stream_video, stream_audio, v=1, a=1)
        .output(media_output)
        .overwrite_output()
        .run_async(pipe_stdin=True, quiet=True)
    )
    buffer.seek(0)
    process2_out, process2_err = process2.communicate(input=buffer.getbuffer())
    # (pdb) process2_out
    # b''


  


  As we can see, no matter which approach chosen, the output is an empty binary. The process_err and process2_err both generate the following message :

  


  ffmpeg version N-111491-g31979127f8-20230717 Copyright (c) 2000-2023 the
FFmpeg developers
  built with gcc 13.1.0 (crosstool-NG 1.25.0.196_227d99d)
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static
--pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64
--target-os=mingw32 --enable-gpl --enable-version3 --disable-debug
--disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2
--enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp
--enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl
--disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib
--enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth
--enable-chromaprint --enable-libdav1d --enable-libdavs2
--disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r
--enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray
--enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist
--enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp
--enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg
--enable-libopenmpt --enable-librav1e --enable-librubberband
--enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt
--enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm
--disable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc
--enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2
--enable-libxvid --enable-libzimg --enable-libzvbi
--extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags=
--extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp
--extra-version=20230717
  libavutil      58. 14.100 / 58. 14.100
  libavcodec     60. 22.100 / 60. 22.100
  libavformat    60. 10.100 / 60. 10.100
  libavdevice    60.  2.101 / 60.  2.101
  libavfilter     9.  8.102 /  9.  8.102
  libswscale      7.  3.100 /  7.  3.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
 "Input #0, mov,mp4,m4a,3gp,3g2,mj2, frompipe:':\r\n"
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2020-11-10T15:01:09.000000Z
  Duration: 00:00:04.16, start: 0.000000, bitrate: N/A
  Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661),
yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 2649 kb/s, 25 fps, 25
tbr, 25k tbn (default)
    Metadata:
      creation_time   : 2020-11-10T15:01:09.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2020-11-10T15:01:09.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 (h264) -> scale:default (graph 0)
  scale:default (graph 0) -> Stream #0:0 (libx264)
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
[libx264 @ 00000243a23a1100] using SAR=1/1
[libx264 @ 00000243a23a1100] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 00000243a23a1100] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 00000243a23a1100] 264 - core 164 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2023 - 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, toaa37f8d7685f4df9af85b1cdcd95997e.mp4':\r\n"
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    encoder         : Lavf60.10.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(tv, progressive),
800x450 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 12800 tbn
    Metadata:
      encoder         : Lavc60.22.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2020-11-10T15:01:09.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.22.100 aac
frame=    0 fps=0.0 q=0.0 size=       0kB time=N/A bitrate=N/A
speed=N/A    \r'
frame=   21 fps=0.0 q=28.0 size=       0kB time=00:00:02.75 bitrate=  
0.1kbits/s speed=4.75x    \r'
[out#0/mp4 @ 00000243a230bd80] video:91kB audio:67kB subtitle:0kB other
streams:0kB global headers:0kB muxing overhead: 2.838559%
frame=  104 fps=101 q=-1.0 Lsize=     162kB time=00:00:04.13 bitrate=
320.6kbits/s speed=4.02x    
[libx264 @ 00000243a23a1100] frame I:1     Avg QP:18.56  size:  2456
[libx264 @ 00000243a23a1100] frame P:33    Avg QP:16.86  size:  1552
[libx264 @ 00000243a23a1100] frame B:70    Avg QP:17.55  size:   553
[libx264 @ 00000243a23a1100] consecutive B-frames:  4.8% 11.5% 14.4%
69.2%
[libx264 @ 00000243a23a1100] mb I  I16..4: 17.3% 82.1%  0.6%
[libx264 @ 00000243a23a1100] mb P  I16..4:  5.9% 15.2%  0.4%  P16..4: 18.3% 
0.9%  0.4%  0.0%  0.0%    skip:58.7%
[libx264 @ 00000243a23a1100] mb B  I16..4:  0.8%  0.3%  0.0%  B16..8: 15.4% 
1.0%  0.0%  direct: 3.6%  skip:78.9%  L0:34.2% L1:64.0% BI: 1.7%
[libx264 @ 00000243a23a1100] 8x8 transform intra:68.2% inter:82.3%
[libx264 @ 00000243a23a1100] coded y,uvDC,uvAC intra: 4.2% 18.4% 1.2% inter:
1.0% 6.9% 0.0%
[libx264 @ 00000243a23a1100] i16 v,h,dc,p: 53% 25%  8% 14%
[libx264 @ 00000243a23a1100] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19%  6% 70%  1% 
1%  1%  1%  0%  0%
[libx264 @ 00000243a23a1100] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 46% 21% 15%  2% 
5%  4%  3%  3%  1%
[libx264 @ 00000243a23a1100] i8c dc,h,v,p: 71% 15% 13%  1%
[libx264 @ 00000243a23a1100] Weighted P-Frames: Y:30.3% UV:15.2%
[libx264 @ 00000243a23a1100] ref P L0: 46.7%  7.5% 34.6%  7.3%  3.9%
[libx264 @ 00000243a23a1100] ref B L0: 88.0% 10.5%  1.5%
[libx264 @ 00000243a23a1100] ref B L1: 98.1%  1.9%
[libx264 @ 00000243a23a1100] kb/s:177.73
[aac @ 00000243a23a2e00] Qavg: 1353.589


  


  I'm at a loss right now, would love any feedback/solution.

  


• 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 ?

  



  

  



  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 ?

  

  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)