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• How to Speed Up Two-Pass Encoding ?

  27 juillet 2017, par Matt McManis

  I have a Video file with Audio, Subtitles, Chapters, and Metadata.

  I removed Audio and Subtitles with -an -sn from -pass 1 and then inlclude them in -pass 2.

  What about for Chapters and Metadata ? And how do you apply Turbo to -pass 1 ?

  Is there anything more that can be done ?

  ---

  I have a script that will convert mpg to mp4. I’ve sorted it with linebreaks so it’s easier to read.

  Pass 1

  "C:\Videos\example.mpg" 
  
  
  
  -vcodec libx264 
  
  -preset medium -b:v 2500K -pix_fmt yuv420p -qcomp 0.8 
  
  -vf scale="trunc(iw/2)*2:trunc(ih/2)*2" 
  
  -pass 1 
  
  
  
  -map 0:v:0? -an -sn
  
  
  
  -threads 8 
  
  
  
  "C:\Videos\example.mp4" 

  Pass 2

  ffmpeg -y -i 
  
  
  
  "C:\Videos\example.mpg" 
  
  
  
  -vcodec libx264 
  
  -preset medium -b:v 2500K -pix_fmt yuv420p -qcomp 0.8 
  
  -vf scale="trunc(iw/2)*2:trunc(ih/2)*2" 
  
  -pass 2 
  
  
  
  -acodec aac 
  
  -b:a 320k 
  
  -af volume=1.2 
  
  
  
  -map 0:v:0? -map 0:a:0? -map 0:s? -c:s copy -map_metadata 0 
  
  
  
  -threads 8 
  
  
  
  "C:\Videos\example.mp4"

• avfilter/vsrc_gradients : make rotation always continuous if speed changes

  3 décembre 2023, par Paul B Mahol

  avfilter/vsrc_gradients : make rotation always continuous if speed changes
  

  • [DH] libavfilter/vsrc_gradients.c

• Error audio loading when runing Whisper Open AI model

  9 juin 2024, par John mick

  The problem I'm trying to solve is that I can't run Whisper model for some audio, it says something related to audio decoding.

  


  payload.wav: Invalid data found when processing input.
raise RuntimeError(f"Failed to load audio: {e.stderr.decode()}") from e


  


  I tried using the micro-machines.wav and it works fine but when i used other audio it gives me an error.

  


  import whisper

model = whisper.load_model("base")
text=model.transcribe('micro-machines.wav',fp16=False)
print(text)
text=model.transcribe('payload.wav',fp16=False)
print(text)


  


  Error I'm getting for payload :

  


  d:\...\venv\lib\site-packages\whisper\transcribe.py:79: UserWarning: FP16 is not supported on CPU; using FP32 instead&#xA;  warnings.warn("FP16 is not supported on CPU; using FP32 instead")                                                                                        &#xA;Traceback (most recent call last):&#xA;  File "d:\...\venv\lib\site-packages\whisper\audio.py", line 42, in load_audio&#xA;    ffmpeg.input(file, threads=0)                                                                                    &#xA;  File "d:\...\venv\lib\site-packages\ffmpeg\_run.py", line 325, in run        &#xA;    raise Error(&#x27;ffmpeg&#x27;, out, err)                                                                                  &#xA;ffmpeg._run.Error: ffmpeg error (see stderr output for detail)                                                       &#xA;&#xA;The above exception was the direct cause of the following exception:&#xA;&#xA;Traceback (most recent call last):&#xA;  File "C:\....\Python\Python39\lib\runpy.py", line 197, in _run_module_as_main&#xA;    return _run_code(code, main_globals, None,&#xA;  File "C:\.....\Python\Python39\lib\runpy.py", line 87, in _run_code&#xA;    exec(code, run_globals)&#xA;  File "D:\...\venv\Scripts\whisper.exe\__main__.py", line 7, in <module>&#xA;  File "d:\...\venv\lib\site-packages\whisper\transcribe.py", line 314, in cli&#xA;    result = transcribe(model, audio_path, temperature=temperature, **args)&#xA;  File "d:\...\venv\lib\site-packages\whisper\transcribe.py", line 85, in transcribe&#xA;    mel = log_mel_spectrogram(audio)&#xA;  File "d:\...\venv\lib\site-packages\whisper\audio.py", line 111, in log_mel_spectrogram&#xA;    audio = load_audio(audio)&#xA;  File "d:\...\venv\lib\site-packages\whisper\audio.py", line 47, in load_audio&#xA;    raise RuntimeError(f"Failed to load audio: {e.stderr.decode()}") from e&#xA;RuntimeError: Failed to load audio: ffmpeg version 6.0-essentials_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers&#xA;  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)&#xA;  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enab&#xA;le-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxv&#xA;id --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf &#xA;--enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libo&#xA;pencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enab&#xA;le-librubberband&#xA;  libavutil      58.  2.100 / 58.  2.100&#xA;  libavcodec     60.  3.100 / 60.  3.100&#xA;  libavformat    60.  3.100 / 60.  3.100&#xA;  libavdevice    60.  1.100 / 60.  1.100&#xA;  libavfilter     9.  3.100 /  9.  3.100&#xA;  libswscale      7.  1.100 /  7.  1.100&#xA;  libswresample   4. 10.100 /  4. 10.100&#xA;  libpostproc    57.  1.100 / 57.  1.100&#xA;payload.wav: Invalid data found when processing input&#xA;</module>

  


  I tried searching for solutions and I found one which says It appears that the code failed to load the audio file for some reason and even failed to display that error because e.stderr did not contain a valid UTF-8 string