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Allow to force the video codec when reading a video using FFMpeg backend #11480

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dapicard opened this issue May 8, 2018 · 2 comments
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Allow to force the video codec when reading a video using FFMpeg backend #11480

dapicard opened this issue May 8, 2018 · 2 comments
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category: video feature
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3.4.2

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@dapicard
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dapicard commented May 8, 2018

System information (version)
  • OpenCV => 3.4.1
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After trying unsuccessfully to use cuvid h264 decoder using the FFMpeg backend, I think that it could be useful to allow to force the video codec used to decode the video.

I see in the source code that the FFMpeg backend can already be configured using an environment variable named "OPENCV_FFMPEG_CAPTURE_OPTIONS", but this one cannot actually be used to force the codec.

So I propose to add an entry to this envvar that would be use to force the codec ; example :
export OPENCV_FFMPEG_CAPTURE_OPTIONS="video_codec;h264_cuvid"
@dapicard
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dapicard commented May 8, 2018

I'm working on :
https://github.com/dapicard/opencv

@dapicard dapicard mentioned this issue May 8, 2018
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@dapicard dapicard mentioned this issue Jun 28, 2018
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@dapicard
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released with OpenCV 3.4.2

sdvillal added a commit to loopbio/opencv-feedstock that referenced this issue Aug 5, 2018
@sdvillal
bump to 3.4.2
65a29c2 
- move to jinja2 syntax
- move contrib download to meta.yaml
- expose thread_type, together with codec_name added in 3.4.2 makes it easier to tune ffmpeg captures
  opencv/opencv#11480
- use CF pins, ensure proper pinnings otherwise
- bump turbo to 2.0.0
- add some more modules to test
@hermesonbarbosa hermesonbarbosa mentioned this issue Apr 27, 2020
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category: video feature
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3.4.2
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@dapicard @alalek