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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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lavc/mediacodecdec_common : enable refcounting of buffers unconditionally
18 septembre 2022, par sfan5lavc/mediacodecdec_common : enable refcounting of buffers unconditionally
This allows av_mediacodec_release_buffer to be called safely after
the decoder is closed, this was already the case with delay_flush=1.
Note that this causes holding onto frames to keep the decoding context
alive which is generally considered to be the intended behavior.Signed-off-by : sfan5 <sfan5@live.de>
Signed-off-by : Anton Khirnov <anton@khirnov.net> -
How to remove black bars with ffmpeg ?
3 novembre 2022, par watch-thisI'm trying to remove black bars from a 637×478 video




here's what happens :


% ffmpeg -i sfu11.mp4 -vf "scale=ih*16/9:ih,scale=iw:-2,setsar=1" -y out.mp4 
ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
 built with Apple clang version 14.0.0 (clang-1400.0.29.102)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
 libavutil 57. 28.100 / 57. 28.100
 libavcodec 59. 37.100 / 59. 37.100
 libavformat 59. 27.100 / 59. 27.100
 libavdevice 59. 7.100 / 59. 7.100
 libavfilter 8. 44.100 / 8. 44.100
 libswscale 6. 7.100 / 6. 7.100
 libswresample 4. 7.100 / 4. 7.100
 libpostproc 56. 6.100 / 56. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sfu11.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2mp41
 encoder : Lavf57.83.100
 Duration: 01:02:49.37, start: 0.000000, bitrate: 15 kb/s
 Chapters:
 Chapter #0:0: start 0.000000, end 99.833000
 Metadata:
 title : Chapter 01
 Chapter #0:1: start 99.833000, end 701.818000
 Metadata:
 title : Chapter 02
 Chapter #0:2: start 701.818000, end 1213.746000
 Metadata:
 title : Chapter 03
 Chapter #0:3: start 1213.746000, end 1726.892000
 Metadata:
 title : Chapter 04
 Chapter #0:4: start 1726.892000, end 2167.882000
 Metadata:
 title : Chapter 05
 Chapter #0:5: start 2167.882000, end 2816.430000
 Metadata:
 title : Chapter 06
 Chapter #0:6: start 2816.430000, end 3769.366000
 Metadata:
 title : Chapter 07
 Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, progressive), 708x478 [SAR 9:10 DAR 1593:1195], 544 kb/s, 23.98 fps, 23.98 tbr, 24k tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 341 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
 Stream #0:2[0x3](eng): Data: bin_data (text / 0x74786574)
 Metadata:
 handler_name : SubtitleHandler
Stream mapping:
 Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7f8630806e00] width not divisible by 2 (849x478)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[aac @ 0x7f8630809d00] Qavg: 15927.165
[aac @ 0x7f8630809d00] 2 frames left in the queue on closing
Conversion failed!


However, the same flags work using
ffplaybut I get horizontal black bars instead.

% ffplay -i sfu11.mp4 -vf "scale=ih\*16/9:ih,scale=iw:-2,setsar=1"




I also tried using the cropdetect filter. It doesn't work and end up with the very same black bars while passing
-vf crop=....

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