Question 1

How to add a watermark to a video with Streamio FFMPEG?

Accepted Answer

Use the watermark option with the image path and watermark_filter hash for position, like { position: "RT", padding_x: 10, padding_y: 10 } for top-right corner with padding. This builds the FFmpeg command automatically without manual filter strings.

Question 2

Streamio FFMPEG or CarrierWave for video processing in Rails?

Accepted Answer

Streamio FFMPEG is better for detailed video manipulation like transcoding and watermarking, as it wraps FFmpeg directly. CarrierWave is a file upload library with basic processing; use Streamio for complex video tasks and CarrierWave for upload management.

Question 3

How to handle multiple audio streams when transcoding?

Accepted Answer

Access streams via movie.audio_streams array and use custom options with -map directives, e.g., custom: %w(-map 0:0 -map 0:1) to include specific streams. The library supports this but requires manual FFmpeg flag configuration.

Question 4

How to set a custom path for the ffmpeg binary?

Accepted Answer

Set FFMPEG.ffmpeg_binary to the full path, e.g., FFMPEG.ffmpeg_binary = '/usr/local/bin/ffmpeg'. This overrides the default assumption that ffmpeg is in the system PATH, useful for controlled environments.

Question 5

Can I disable output validation for HLS formats?

Accepted Answer

Yes, pass validate: false in transcoder_options to skip validation when output generates multiple files, like in HLS. Note that transcode will return nil in this case, so error handling is on the developer.

Question 6

How to take screenshots at regular intervals from a video?

Accepted Answer

Use the screenshot method with vframes and frame_rate options, e.g., movie.screenshot("screenshot_%d.jpg", { vframes: 20, frame_rate: '1/6' }, validate: false) to capture up to 20 screenshots every 10 seconds.

Question 7

Is Streamio FFMPEG compatible with FFmpeg 5.x or later?

Accepted Answer

The README states it's tested with FFmpeg 2.8.4 and compatibility isn't guaranteed for later versions. Check the GitHub issues or update the gem for newer FFmpeg support, as changes in FFmpeg output can break parsing.

Streamio FFMPEG

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