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You can use the following ffmpeg Custom command to trim a video, specifying the start time and duration:

-ss 00:00:30 -t 00:01:00 -c copy

Here’s what the options mean:
- -ss 00:00:30: The start time of the trim (in this example, 30 seconds).
- -t 00:01:00: The duration of the trim (in this example, 1 minute).
- -c copy: Copies the video and audio streams without re-encoding (which is faster and preserves quality).
This command will produce output video, containing only the 1-minute segment starting at 30 seconds into the original video.
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If you want to re-encode the video (e.g., for compatibility), remove -c copy:

-ss 00:00:30 -t 00:01:00

This will result in a longer process since it will re-encode the video.
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When re-encoding a video with ffmpeg, you have several options to control the quality and file size. Here’s how you can use the -crf (Constant Rate Factor) and -ac (Audio Channels) options, among others:
1. Re-encoding with CRF for Quality Control
CRF (Constant Rate Factor) is a quality setting used by the libx264 (H.264) and libx265 (H.265) encoders in ffmpeg. The range is typically from 0 to 51:
- Lower values mean higher quality (and larger file sizes).
- Higher values mean lower quality (and smaller file sizes).
- A CRF value of around 18-23 is a good starting point for H.264, with 18 being visually lossless.

Example:

-ss 00:00:30 -t 00:01:00 -c:v libx264 -crf 23 -preset medium -c:a aac -b:a 128k

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2. Explanation of the Options:
- -c:v libx264: Specifies the video codec (H.264 in this case).
- -crf 23: Sets the CRF value to 23, balancing quality and file size.
- -preset medium: Controls the encoding speed and compression (options: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow). Slower presets result in better compression and smaller file sizes but take more time.
- -c:a aac: Specifies the audio codec (AAC in this case).
- -b:a 128k: Sets the audio bitrate to 128 kbps.

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3. Changing Audio Settings
- -ac 2: Sets the number of audio channels (e.g., 2 for stereo).
- -ar 44100: Sets the audio sampling rate (e.g., 44100 Hz).

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4. Full Example Command

-ss 00:00:30 -t 00:01:00 -c:v libx264 -crf 23 -preset medium -c:a aac -b:a 128k -ac 2 -ar 44100

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5. H.265 Example (Optional)
If you want to use the H.265 codec for better compression:

-ss 00:00:30 -t 00:01:00 -c:v libx265 -crf 28 -preset medium -c:a aac -b:a 128k

For H.265, a CRF of 28 is roughly equivalent to a CRF of 23 in H.264 in terms of visual quality.
These commands will allow you to trim and re-encode your video while maintaining control over the quality and file size.

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