Wie kann ich die Dimensionen des Videos durch FFMPEG-Python ändern? ⇐ Python

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Ich versuche, eine Videodatei zu ändern, die ein Benutzer mit FFMPEG-Python auf Django hochgeladen hat. Die Dokumentation ist nicht sehr leicht zu verstehen, daher habe ich versucht, dies aus verschiedenen Quellen zusammenzuschuhen. Für den Benutzer. Das Problem, mit dem ich ausgesetzt bin, ist, dass ich die Videodatei nicht ändern kann. Ich habe zwei verschiedene Ansätze ausprobiert: < /p>

Code: Select all

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''
< /code>
Wie wir sehen können, ist die Ausgabe unabhängig davon, welcher Ansatz eine leere Binärdatum ist. Die folgende Nachricht generieren die folgende Nachricht:
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

Ich bin im Moment ratlos, würde mich über Feedback/Lösung freuen.