Questions tagged [libav]
An open source audio/video library.
9
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Using ffprobe to detect black frames outputs duplicate results
I'm using ffprobe to detect black frames of a video. However, the output produces duplicate entries for each black_start and black_end. Looking for help in figuring out why it duplicates these results....
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0
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ffmpeg: VAAPI can't do nearest neighbor scaling?
I've been using ffmpeg on my laptop for some time and I could have sworn that scale_vaapi had an option to set the flags to nearest neighbor. I need nearest neighbor scaling because I'm converting low-...
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MP4 Video created with ffmpeg C++ api does not show in OSX
I am writing a MP4 video from scratch using the C++ API (libav* 4.1.1). This video can be played back just fine using ffplay or VLC. But the Finder Preview and the Quicktime Player on OSX (10.13 and ...
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Are ffmpeg prores files reliable enough to be used in production/broadcast environment?
Recently I'm transcoding a lot of material that I wish to use in broadcast and production environment where they use all sort of macs and apple software.
I'm not very fan of apple computers and I ...
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4
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2
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How is possible for YouTube and Vimeo transcode so fast?
For the bit I read YouTube and Vimeo rely on servers powered by some modified libs i guess like libavcodec and tools like ffmpeg in a serious custom build.
Let's assume a transcode to h264 but the ...
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Libav/ X264 failed to compile with Hi422p profile and mp4 container support [closed]
My goal is to encode several videos from SD PAL captured in ProRes(HQ) 422 10bit through AJA Kona 3 to H264 with Hi422p profile in .mp4 container. I work on Mac OSX 9.
I try the last x264 10bit ...
2
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0
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388
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avconv: How to blur scenes?
I want to blur some scenes with avconv
The ffmpeg command -find it here- is:
ffmpeg -i input.avi -vf "boxblur=enable='between(t,22,113)'" -codec:a copy output.avi
doesn't work with avconv
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4
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Invalid timebase converting videos from Galaxy S3
I have a video that I recorded on my phone and would like to flip horizontally. I am using the following command:
avconv -i 20131117_220136.mp4 -vf "hflip" 20131117_220136.flipped.mp4
I get the ...
Will
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2
answers
2k
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Deinterlace by dropping even lines from command line
I want to make an interlaced video with 50fps into a 25fps progressive, in the process i'm also reducing the size of the frame. Currently i am using avconv and there are deinterlacing options, however,...
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