从python中的输出读取Bytes图像
从python中的输出读取Bytes图像
提问于 2020-02-05 10:34:36
我使用imageio.get_reader(BytesIO(a), 'ffmpeg')加载一个字节图像，并将其保存为普通图像。
但是，当我使用imageio.get_reader(BytesIO(a), 'ffmpeg')读取图像时，下面的错误会抛出
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/functions.py", line 186, in get_reader
return format.get_reader(request)
File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/format.py", line 164, in get_reader
return self.Reader(self, request)
File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/format.py", line 214, in __init__
self._open(**self.request.kwargs.copy())
File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 323, in _open
self._initialize()
File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 466, in _initialize
self._meta.update(self._read_gen.__next__())
File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio_ffmpeg/_io.py", line 150, in read_frames
raise IOError(fmt.format(err2))
OSError: Could not load meta information
=== stderr ===
ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
configuration: --prefix=/home/tango/anaconda3 --cc=/home/conda/feedstock_root/build_artifacts/ffmpeg_1566210161358/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --disable-openssl --enable-avresample --enable-gnutls --enable-gpl --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-libx264 --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
[matroska,webm @ 0x5619b9da3cc0] File ended prematurely
[matroska,webm @ 0x5619b9da3cc0] Could not find codec parameters for stream 0 (Video: h264, none, 1280x720): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, matroska,webm, from '/tmp/imageio_zm6hhpgr':
Metadata:
title : Kinesis Video SDK
encoder : Kinesis Video SDK 1.0.0
AWS_KINESISVIDEO_FRAGMENT_NUMBER: 91343852333183888465720004820715065721442989478
AWS_KINESISVIDEO_SERVER_TIMESTAMP: 1580791384.096
AWS_KINESISVIDEO_PRODUCER_TIMESTAMP: 1580791377.843
Duration: N/A, bitrate: N/A
Stream #0:0(eng): Video: h264, none, 1280x720, SAR 1:1 DAR 16:9, 1k tbr, 1k tbn, 2k tbc (default)
Metadata:
title : kinesis_video
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed!以上读取MKV字节文件的方法是基于此thread完成的。
或是否有任何方法来解析和读取MKV字节文件.
回答 1
Stack Overflow用户
发布于 2022-02-07 08:20:47
老问题，但我会留给未来的读者一个答案:)
通常，如果您有一个字节字符串来编码视频(或图像)，那么您很有可能直接将它传递到ImageIO的高级API中，并且它可以直接读取这些字节。对于MKV (和其他一些视频格式)，ImageIO需要一些帮助，因为当前的ffmpeg插件与字节字符串斗争。有一个新的插件来解决这个问题和其他问题。
ImageIO<2.15.0
import imageio as iio
req = iio.core.Request(mkv_bytes, "r")
# note: this is where imageIO needs some help, see
# https://github.com/imageio/imageio/issues/686
req._extension = ".mkv"
first_frame = iio.imread(req)ImageIO>2.15.0 (本周发布- W6 2022)
import imageio as iio
first_frame = iio.v3.imread(mkv_bytes, format_hint=".mkv")页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60073859
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