leandromoreira / leandromoreira/ffmpeg-libav-tutorial
Effeciently extract subset of images from video
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- Dominant language
- C
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Description
Related to this issue: https://github.com/leandromoreira/ffmpeg-libav-tutorial/issues/83
FFmpeg CLI has the ability to perform frame accurate input seeking which is very fast if you want to extract a frame at a time. See: https://trac.ffmpeg.org/wiki/Seeking.
However, I have a very long video (~2-3 hours) and hundreds of timestamps at which I want to extract frames. Is there a way I can leverage the input seeking at the libav level? I don't want to just call the CLI in a loop for each timestamp.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reviewing the FFmpeg seeking documentation and the tutorial's libav-level entry points. Determine whether multiple timestamped frames can be extracted efficiently without invoking the CLI repeatedly; done means documenting or demonstrating a viable approach for the stated long-video use case.
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Assessment
- Tech stack
- c
- Domain
- audio-video-rtc
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100