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Is there any reason to suspect that they used a longer GOP structure? Is the default one for ffmpeg longer than the recording software?
by boomboomsubban 6y ago
Is there any reason to suspect that they used a longer GOP structure? Is the default one for ffmpeg longer than the recording software?
- dylan604 6y agoI didn't see ffmpeg command to compare. I was talking in general. Usually, it is just a value you modify. A typical GOP is 1 second. That allows decent seeking within the file. On something static, you could push it to 10 seconds. If you use ffmpeg, you can fiddle with the switches until the cows come home. For homework, you can use the same methods and use MediaInfo or ffprobe to see the GOP sizes. My money would be on 1 second GOPs from both.
- dylan604 6y agoFrom my specific tests from elsewhere in this thread, I did further analysis of the files that were run based on the examples listed in the comment. The original screen capture H.264 files did have a 1 second GOP size. However, the very simplistic ffmpeg commands to make the h.265 & h.264 files that I made used the default GOP settings from ffmpeg. Turns out, the default is 4 seconds. That would easily help get the final file size down.
- boomboomsubban 6y agoYou have went far beyond what I expected, thank you. And yet the original post I replied to is still a bit of a mystery. A recording of a desktop played a role, but h.265 still seems like a large part.