Lets try an example. This took chatGPT seconds to answer. Tell me how long it would take a person with zero ffmpeg experience to come up with the same solution using just google / stack overflow.
---
Create me a command using FFMPEG to convert all video files in a directory. The source files are mkv files in 4k, and they should be output as mp4 files with h264 encoding at 720p. Also, produce a thumbnail image for each cropped to 320x320 pixels using a frame of the video 10 seconds from the beginning.
Also, this does not just have to be blindly copy/pasted. ChatGPT also went on to break down exactly what this command does so you can revise it / understand it.
Here's a breakdown of the ffmpeg command and its flags used in the solution:
* -i "$file": Specifies the input file.
* -c:v libx264: Sets the video codec to libx264, which is a widely used H.264 video encoder.
* -preset slow: Specifies the encoding preset as "slow." The encoding presets range from "ultrafast" (fastest but lower compression) to "veryslow" (slowest but higher compression). "Slow" strikes a balance between compression efficiency and encoding time.
* -crf 18: Sets the Constant Rate Factor (CRF) for video quality. A lower CRF value, such as 18, indicates higher quality and larger file sizes. You can adjust this value based on your desired trade-off between quality and file size.
* -c:a aac -b:a 192k: Sets the audio codec to AAC with a bitrate of 192 kbps. Adjust the bitrate value as per your requirements.
* -vf "select=eq(n\,300)": Specifies a video filter to select the frame at the 300th second (10 seconds from the beginning) of the video. You can modify the value inside the eq() function to select a different frame.
* -s 1280x720: Sets the output resolution of the video to 1280x720 pixels, representing 720p resolution.
* -frames:v 1: Specifies that only one frame should be extracted from the video.
* "${file%.*}.mp4": Generates the output MP4 file with the same name as the input file, but with the extension changed to .mp4.
Lets try an example. This took chatGPT seconds to answer. Tell me how long it would take a person with zero ffmpeg experience to come up with the same solution using just google / stack overflow.
---
Create me a command using FFMPEG to convert all video files in a directory. The source files are mkv files in 4k, and they should be output as mp4 files with h264 encoding at 720p. Also, produce a thumbnail image for each cropped to 320x320 pixels using a frame of the video 10 seconds from the beginning.
Also, this does not just have to be blindly copy/pasted. ChatGPT also went on to break down exactly what this command does so you can revise it / understand it.Here's a breakdown of the ffmpeg command and its flags used in the solution:
* -i "$file": Specifies the input file.
* -c:v libx264: Sets the video codec to libx264, which is a widely used H.264 video encoder.
* -preset slow: Specifies the encoding preset as "slow." The encoding presets range from "ultrafast" (fastest but lower compression) to "veryslow" (slowest but higher compression). "Slow" strikes a balance between compression efficiency and encoding time.
* -crf 18: Sets the Constant Rate Factor (CRF) for video quality. A lower CRF value, such as 18, indicates higher quality and larger file sizes. You can adjust this value based on your desired trade-off between quality and file size.
* -c:a aac -b:a 192k: Sets the audio codec to AAC with a bitrate of 192 kbps. Adjust the bitrate value as per your requirements.
* -vf "select=eq(n\,300)": Specifies a video filter to select the frame at the 300th second (10 seconds from the beginning) of the video. You can modify the value inside the eq() function to select a different frame.
* -s 1280x720: Sets the output resolution of the video to 1280x720 pixels, representing 720p resolution.
* -frames:v 1: Specifies that only one frame should be extracted from the video.
* "${file%.*}.mp4": Generates the output MP4 file with the same name as the input file, but with the extension changed to .mp4.