76 lines
2.4 KiB
Markdown
76 lines
2.4 KiB
Markdown
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Neat comparison commands
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------------------------
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this command will take a input video and transcode it for every crf value in a range
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crfleveltest.sh
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```
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#!/bin/bash
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for i in {0..63}
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do
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echo da real time bro $i >> timetime
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date >> timetime
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ffmpeg -i originalencoding.mkv -c:a copy -c:v libsvtav1 -preset 8 -crf $i svtav1/crftest/svtav1_$i.mkv
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#echo \n >> timetime
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done
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```
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this will take a specific frame out off all the videos in a folder which is useful for comparing the crf values on a specific frame
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frameextractor.sh
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```
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#!/bin/bash
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output_directory="png"
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for video in *mkv; do
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filename=$(basename -- "$video")
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filename_no_ext="${filename%.*}"
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ffmpeg -ss 00:00:10 -i "$video" -vframes 1 "$output_directory/$filename_no_ext.png"
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done
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```
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this will take all the file names of the pngs and put them into subtitles so you cam see what video (crf value typically) the current frame was from
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subtitles.py
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```
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import os
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# Assuming files are in the current directory.
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# Modify this path to the location of your PNG files if needed.
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files = sorted([f for f in os.listdir('.') if f.endswith('.png')])
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# Start time for each subtitle in seconds
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start_time = 0.0
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# The duration each subtitle is displayed for in seconds
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duration = 0.1
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with open('subtitles.srt', 'w') as f:
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for i, filename in enumerate(files, start=1):
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# Format start and end times
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start_h = int(start_time // 3600)
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start_m = int((start_time % 3600) // 60)
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start_s = int(start_time % 60)
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start_ms = int(round((start_time % 1) * 1000))
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start = "{:02d}:{:02d}:{:02d},{:03d}".format(start_h, start_m, start_s, start_ms)
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end_time = start_time + duration
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end_h = int(end_time // 3600)
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end_m = int((end_time % 3600) // 60)
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end_s = int(end_time % 60)
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end_ms = int(round((end_time % 1) * 1000))
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end = "{:02d}:{:02d}:{:02d},{:03d}".format(end_h, end_m, end_s, end_ms)
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# Write subtitle entry
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f.write(f"{i}\n{start} --> {end}\n{filename}\n\n")
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# Update start time for next subtitle
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start_time += duration
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```
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this will combine all the pngs and subtitles to a video to be watched just make sure the framerates match between this command and rhe ones specified in the subtitle command
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pngcombiner
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```
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ffmpeg -framerate 10 -i svtav1_%02d.png -i subtitles.srt -c:v libx264 -crf 10 output.mkv
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```
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