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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 convert from .srt to .ass with FFmpeg without decoding errors

  10 avril 2020, par symonxd

  When I try the following command with FFmpeg (v. git-2020-03-24-e5d25d1) : ffmpeg -i subs.srt subs.ass, I get a bunch of the following errors :

  



  [srt @ 0000028ea78fa780] Invalid UTF-8 in decoded subtitles text; maybe missing -sub_charenc option
Error while decoding stream #0:0: Invalid data found when processing input


  



  and :

  



  [ass @ 0000028ea78ffe40] ReadOrder gap found between 3 and 4


  



  I found that my .srt file contains the following char : ë
I tried adding the flag -sub_charenc UTF-8 as stated here with no success.

  



  How can I successfully convert .srt to .ass ?

  


• Flutter_ffmpeg : At least one output file must be specified

  22 mars 2020, par Jehonadab Okpukoro

  I’m trying to crop a video with Flutter_ffmpeg package using this -i $inputPath -filter:v "crop=80:60:200:100" -c $outputPath, but I’m having this error message

  Running FFmpeg with arguments: [-i, /data/user/0/com.timz/app_flutter/Movies/flutter_test/1584827688309.mp4, -filter:v, crop=80:60:200:100, -c, /data/user/0/com.timz/cache/output.mp4].
  
  I/flutter (20728): ffmpeg version git-2020-01-25-fd11dd500
  
  I/flutter (20728):  Copyright (c) 2000-2020 the FFmpeg developers
  
  I/flutter (20728): 
  
  I/flutter (20728):   built with Android (5220042 based on r346389c) clang version 8.0.7 (https://android.googlesource.com/toolchain/clang b55f2d4ebfd35bf643d27dbca1bb228957008617) (https://android.googlesource.com/toolchain/llvm 3c393fe7a7e13b0fba4ac75a01aa683d7a5b11cd) (based on LLVM 8.0.7svn)
  
  I/flutter (20728):   configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --disable-v4l2-m2m --disable-outdev=v4l2 --disable-outdev=fbdev --disable-indev=v4l2 --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disa
  
  I/flutter (20728):   libavutil      56. 38.100 / 56. 38.100
  
  I/flutter (20728):   libavcodec     58. 65.102 / 58. 65.102
  
  I/flutter (20728):   libavformat    58. 35.101 / 58. 35.101
  
  I/flutter (20728):   libavdevice    58.  9.103 / 58.  9.103
  
  I/flutter (20728):   libavfilter     7. 70.101 /  7. 70.101
  
  I/flutter (20728):   libswscale      5.  6.100 /  5.  6.100
  
  I/flutter (20728):   libswresample   3.  6.100 /  3.  6.100
  
  I/flutter (20728): Trailing option(s) found in the command: may be ignored.
  
  D/flutter-ffmpeg(20728): FFmpeg exited with rc: 1
  
  I/flutter (20728): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.timz/app_flutter/Movies/flutter_test/1584827688309.mp4':
  
  I/flutter (20728):   Metadata:
  
  I/flutter (20728):     major_brand     : 
  
  I/flutter (20728): mp42
  
  I/flutter (20728): 
  
  I/flutter (20728):     minor_version   : 
  
  I/flutter (20728): 0
  
  I/flutter (20728): 
  
  I/flutter (20728):     compatible_brands: 
  
  I/flutter (20728): isommp42
  
  I/flutter (20728): 
  
  I/flutter (20728):     creation_time   : 
  
  I/flutter (20728): 2020-03-21T21:54:56.000000Z
  
  I/flutter (20728): 
  
  I/flutter (20728):     com.android.version: 
  
  I/flutter (20728): 9
  
  I/flutter (20728): 
  
  I/flutter (20728):   Duration: 
  
  I/flutter (20728): 00:00:07.17
  
  I/flutter (20728): , start: 
  
  I/flutter (20728): 0.000000
  
  I/flutter (20728): , bitrate: 
  
  I/flutter (20728): 3870 kb/s
  
  I/flutter (20728): 
  
  I/flutter (20728):     Stream #0:0
  
  I/flutter (20728): (eng)
  
  I/flutter (20728): : Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 720x480, 3854 kb/s
  
  I/flutter (20728): , SAR 1:1 DAR 3:2
  
  I/flutter (20728): , 
  
  I/flutter (20728): 29.44 fps, 
  
  I/flutter (20728): 29.83 tbr, 
  
  I/flutter (20728): 90k tbn, 
  
  I/flutter (20728): 180k tbc
  
  I/flutter (20728):  (default)
  
  I/flutter (20728): 
  
  I/flutter (20728):     Metadata:
  
  I/flutter (20728):       rotate          : 
  
  I/flutter (20728): 270
  
  I/flutter (20728): 
  
  I/flutter (20728):       creation_time   : 
  
  I/flutter (20728): 2020-03-21T21:54:56.000000Z
  
  I/flutter (20728): 
  
  I/flutter (20728):       handler_name    : 
  
  I/flutter (20728): VideoHandle
  
  I/flutter (20728): 
  
  I/flutter (20728):     Side data:
  
  I/flutter (20728):       
  
  I/flutter (20728): displaymatrix: rotation of 90.00 degrees
  
  I/flutter (20728): 
  
  I/flutter (20728):     Stream #0:1
  
  I/flutter (20728): (eng)
  
  I/flutter (20728): : Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 12 kb/s
  
  I/flutter (20728):  (default)
  
  I/flutter (20728): 
  
  I/flutter (20728):     Metadata:
  
  I/flutter (20728):       creation_time   : 
  
  I/flutter (20728): 2020-03-21T21:54:56.000000Z
  
  I/flutter (20728): 
  
  I/flutter (20728):       handler_name    : 
  
  I/flutter (20728): SoundHandle
  
  I/flutter (20728): 
  
  I/flutter (20728): At least one output file must be specified

  I’ve been cracking my head with this for the past two days, kindly share your thoughts on what might wrong.