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The Great Big Beautiful Tomorrow
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Mis à jour : Octobre 2011
Langue : English
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Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
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Emballe médias : à quoi cela sert ?
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Sur d’autres sites (5759)
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FFmpeg output video file much smaller than uncompressed input audio file, using option to preserve original audio quality
17 mars 2021, par JanI attempt to create a video slideshow from a number of image files and an audio file in 2 steps :


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- Create a temporary video file from a sequence of image files
- Add an audio file to the temporary video file with a delay of 5 seconds






The audio file is an uncompressed stereo wav file, encoded with a sample rate of 44100 Hz and a bit depth of 32 bits, with a size of 40.1 MB. To preserve the lossless quality of the input audio file I use the option -c:a aac -b:a 192k as per Slideshow Wiki. However, the final output video file has a size of only 4.49 MB.


How can the output video file be about 10 times smaller than the input audio file and still preserve the original lossless quality ?


My code :


ffmpeg -f concat -i slide-sequence.txt -c:v libx264 -r 30 -filter_complex format=yuv420p temp.mp4
ffmpeg -i temp.mp4 -i audio.wav -af "adelay=5000|5000" -c:v copy -c:a aac -b:a 192k out.mp4


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File contains data in an unknown format. (m4a load from librosa)
2 août 2022, par Moriyama AikoSo I am currently working on a DNN that takes in m4a files. I have ffmpeg, it creates a few batches and then dies on this error :


Traceback (most recent call last):
 File "/users/work/s163838/./main.py", line 126, in <module>
 
 File "/users/work/s163838/./main.py", line 96, in main
 print("e")
 File "/apl/tryton/python/3.9.5/lib/python3.9/site-packages/torch/utils/data/dataloader.py", line 521, in __next__
 data = self._next_data()
 File "/apl/tryton/python/3.9.5/lib/python3.9/site-packages/torch/utils/data/dataloader.py", line 1203, in _next_data
 return self._process_data(data)
 File "/apl/tryton/python/3.9.5/lib/python3.9/site-packages/torch/utils/data/dataloader.py", line 1229, in _process_data
 data.reraise()
 File "/apl/tryton/python/3.9.5/lib/python3.9/site-packages/torch/_utils.py", line 425, in reraise
 raise self.exc_type(msg)
EOFError: Caught EOFError in DataLoader worker process 0.
Original Traceback (most recent call last):
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/librosa/core/audio.py", line 164, in load
 y, sr_native = __soundfile_load(path, offset, duration, dtype)
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/librosa/core/audio.py", line 195, in __soundfile_load
 context = sf.SoundFile(path)
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/soundfile.py", line 629, in __init__
 self._file = self._open(file, mode_int, closefd)
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/soundfile.py", line 1183, in _open
 _error_check(_snd.sf_error(file_ptr),
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/soundfile.py", line 1357, in _error_check
 raise RuntimeError(prefix + _ffi.string(err_str).decode('utf-8', 'replace'))
RuntimeError: Error opening 'vox2/dev/aac/id08194/QnBYPze-x9A/00079.m4a': File contains data in an unknown format.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "/apl/tryton/python/3.9.5/lib/python3.9/site-packages/torch/utils/data/_utils/worker.py", line 287, in _worker_loop
 data = fetcher.fetch(index)
 File "/apl/tryton/python/3.9.5/lib/python3.9/site-packages/torch/utils/data/_utils/fetch.py", line 44, in fetch
 data = [self.dataset[idx] for idx in possibly_batched_index]
 File "/apl/tryton/python/3.9.5/lib/python3.9/site-packages/torch/utils/data/_utils/fetch.py", line 44, in <listcomp>
 data = [self.dataset[idx] for idx in possibly_batched_index]
 File "/users/work/s163838/vox_celeb_loader.py", line 53, in __getitem__
 load(speaker2utt1, self.num_samples)
 File "/users/work/s163838/vox_celeb_loader.py", line 13, in load
 wav, sr = librosa.load(path, sr=16000)
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/librosa/util/decorators.py", line 88, in inner_f
 return f(*args, **kwargs)
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/librosa/core/audio.py", line 170, in load
 y, sr_native = __audioread_load(path, offset, duration, dtype)
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/librosa/core/audio.py", line 226, in __audioread_load
 reader = audioread.audio_open(path)
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/audioread/__init__.py", line 111, in audio_open
 return BackendClass(path)
 File "/users/kdm/s163838/.local/lib/python3.9/site-packages/audioread/rawread.py", line 65, in __init__
 self._file = aifc.open(self._fh)
 File "/apl/tryton/python/3.9.5/lib/python3.9/aifc.py", line 917, in open
 return Aifc_read(f)
 File "/apl/tryton/python/3.9.5/lib/python3.9/aifc.py", line 358, in __init__
 self.initfp(f)
 File "/apl/tryton/python/3.9.5/lib/python3.9/aifc.py", line 314, in initfp
 chunk = Chunk(file)
 File "/apl/tryton/python/3.9.5/lib/python3.9/chunk.py", line 63, in __init__
 raise EOFError
EOFError

</listcomp></module>

I am using this command


wav, sr = librosa.load(path, sr=16000)


is it just a broken file ? How do I skip such then ? Or is it something about loading a m4a file even with ffmpeg and the desired output when tested on a single m4a file ?


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FFmpeg : encoding a PCM audio file to AAC using AAC codec info from another file
7 septembre 2022, par Siddharth KumarI have two audio files :


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audio_0.wav: PCM audioaudio_1.aac: encoded audio using some parameters






I'm trying to achieve the following outcome with FFmpeg :


Create a new file
audio_2.aacwhich contains audio fromaudio_0.wavencoded using the codec parameters fromaudio_1.aac.

If I run the following :

ffmpeg -i audio_0.wav -i audio_1.aac -c copy audio_2.aacthen I get streams from both muxed together.
I do not want content fromaudio1.aac. Any pointers to solve this would be appreciated.

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