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• ffmpeg error "Output file is empty, nothing was encoded" when trying to increase the tempo (speed up) mp3 file

  28 octobre 2022, par rasoolZero

  I'm trying to increase the tempo of an mp3 file using ffmpeg and atempo filter, but always get "Output file is empty, nothing was encoded"

  


  this is the output log

  


  ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200726
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 0000023bf37fdbc0] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'normal.mp3':
  Metadata:
    encoder         : Lavf58.65.100
  Duration: 00:00:05.93, start: 0.000000, bitrate: 32 kb/s
    Stream #0:0: Audio: mp3, 22050 Hz, mono, fltp, 32 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mp3 (mp3float) -> mp3 (mp3_mf))
Press [q] to stop, [?] for help
[mp3_mf @ 0000023bf3822880] MFT name: 'MP3 Encoder ACM Wrapper MFT'
Output #0, mp3, to 'faster.mp3':
  Metadata:
    TSSE            : Lavf58.45.100
    Stream #0:0: Audio: mp3 (mp3_mf), 22050 Hz, mono, s16, 128 kb/s
    Metadata:
      encoder         : Lavc58.91.100 mp3_mf
size=       0kB time=00:00:05.42 bitrate=   0.7kbits/s speed= 116x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


  


  this is the command I'm using
ffmpeg -i normal.mp3 -af "atempo=1.1" faster.mp3

  


• FFMPEG bash > folder processing > AI upscale - script ERROR ">" [closed]

  13 novembre 2022, par Jason Paul Michaels

  Trying to port a single file manual command from Topaz AI so I can run it as a part of a simple script allowing me to run multiple sessions from terminal. I am running MacOS with BASH 5.2 and when I run the script I get dumped to ">" instead of command prompt and no error message is displayed.

  


  This is my command -

  


  for f in *.mp4; do
  /Applications/Topaz\ Video\ AI.app/Contents/MacOS/ffmpeg \
    -hide_banner \
    -nostdin \
    -y \
    -nostats \
    -i “$f” \
    -vsync 0 \
    -avoid_negative_ts 1 \
    -sws_flags spline+accurate_rnd+full_chroma_int \
    -color_trc 1 \
    -colorspace 1 \
    -color_primaries 1 \
    -filter_complex veai_up=model=prob-3:scale=0:w=1920:h=1080:preblur=0:noise=0:details=0:halo=0:blur=0:compression=0:estimate=20:device=0:vram=1:instances=1,scale=w=1920:h=1080:flags=lanczos:threads=0,scale=out_color_matrix=bt709 \
    -c:v prores_videotoolbox \
    -profile:v lt \
    -pix_fmt p210le \
    -allow_sw 1 \
    -map_metadata 0 \
    -movflags frag_keyframe+empty_moov+delay_moov+use_metadata_tags+write_colr \
    -map_metadata:s:v 0:s:v \
    -map_metadata:s:a 0:s:a \
    -c:a aac \
    "encoded/${f%.*}.mp4”;
done


  


  I have a feeling it's something really simple I'm missing but I've gone through it a dozen times and can't seem to modify in any way to success.

  


  Thank you !

  


  Getting dumped back to ">" terminal prompt.

  


• Saving OpenCV output in Motion JPEG format. Getting a "'MJPG' is not supported with codec id 7" error

  23 novembre 2022, par portsample

  I'd like to save video camera output in motion JPEG (MJPG) format. The below code,

  


  import cv2
import numpy as np

cap = cv2.VideoCapture(0)
if (cap.isOpened() == False): 
print("Unable to read camera feed")
frame_width = int(cap.get(3))
frame_height = int(cap.get(4))
frame_per_sec = int('10')

out = cv2.VideoWriter('output.mjpeg',cv2.VideoWriter_fourcc('M','J','P','G'),         (frame_per_sec), (frame_width,frame_height))
while(True):
ret, frame = cap.read()
if ret == True:      
# Write the frame into the file 'output.mjpeg'
out.write(frame) 
# Display the resulting frame    
cv2.imshow('frame',frame)
# Press Q on keyboard to stop recording
if cv2.waitKey(1) & 0xFF == ord('q'):
  break
else:
break 
cap.release()
out.release()
cv2.destroyAllWindows()


  


  While it will run, I am getting the following error(s),

  


  [ WARN:0] OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
OpenCV: FFMPEG: tag 0x67706a6d/'mjpg' is not supported with codec id 7 and format 'mjpeg / raw MJPEG video'


  


  What can I do to resolve these ? I've tried changing the case, ('M','J','P','G' to 'm','j','p','g') with no success.
Appreciate any suggestions regarding resolving the above issue, as well as the GStreamer issue. Thanks in advance.