[ffmpeg] ffmpeg tips #bash #tips #pinned

ffmpeg-audacity.md

format for audacity

Export / Export Audio / (external program)

ffmpeg -i - -codec:a libopus -b:a 64k -vbr on -compression_level 10 "%f" # whithout space in path file

ffmpeg-concat.md

# concat files
ffmpeg -f concat -safe 0 -i <(echo -e "file \"${file1}\"\nfile \"${file2}\"") -c copy ${fileout}
ffmpeg -i "concat:${file1}|${file2}" -codec copy "${fileout}" # join files

ffmpeg-encode.md

audio & video

# extract audio
ffmpeg -i "$file" -vn -acodec copy $file_out

# encode audio
ffmpeg -i "${file}" -c:v libx265 -codec:a libopus -b:a 64k -vbr on -compression_level 10 "${path}/${file%.*}.mp4"

# batch to encode audio
path="/ext/shared/Videos/ffmpeg" && path2="/tmp/ffmpeg-batch-$(date +%s)" && while read file; do echo "ffmpeg -i \"${file}\" -c:v libx265 -codec:a libopus -b:a 64k -vbr on -compression_level 10 \"${file%.*}-resized.mp4\"" >> "${path2}"; done < <(find "${path}" -name "*.*") && chmod +x "${path2}" && echo "Launch: ${path2}"

# batch to encode audio video with crop & scale
crop="W:H:X:Y"
scale="800x720"
scale="800:-1"
path="/home/nikita/Downloads/.tmp/ffmpeg" && path2="/tmp/ffmpeg-batch-$(date +%s)" && while read file; do echo "ffmpeg -i \"${file}\" -filter:v crop=${crop},scale=${scale} -c:v libx265 -codec:a libopus -b:a 64k -vbr on -compression_level 10 \"${file%.*}-resized.mp4\"" >> "${path2}"; done < <(find "${path}" -name "*.webm") && chmod +x "${path2}" && echo "Launch: ${path2}"

audio

encode audio

# compress audio
ffmpeg -i "$file" -codec:a libopus -b:a 64k -vbr on -compression_level 10 "${file%.*}.opus"

# batch to compress audio
path="/home/nikita/Downloads/.tmp/ffmpeg" && path2="/tmp/ffmpeg-batch-$(date +%s)" && while read file; do echo "ffmpeg -i \"$file\" -c:v copy -codec:a libopus -b:a 64k -vbr on -compression_level 10 \"${file%.mp4}-audio.mp4\"" >> "${path2}"; done < <(find "${path}" -name "*.mp4") && chmod +x "${path2}" && echo "Launch: ${path2}"

replace audio

# replace audio in video
ffmpeg -i "$file" -i "${file%.mp4}.opus" -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 "${file%.mp4}-audio.mp4"

# batch to replace audio
path="/home/nikita/Downloads/.tmp/ffmpeg" && path2="/tmp/ffmpeg-batch-$(date +%s)" && while read file; do echo "ffmpeg -i \"${file}\" -i \"${file%.mp4}.opus\" -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 \"${file%.mp4}-audio.mp4\"" >> "${path2}"; done < <(find "${path}" -name "*.mp4") && chmod +x "${path2}" && echo "Launch: ${path2}"

video

# resize video, -1 asks to ffmpeg to keep proportion
ffmpeg -i "$file" -filter:v scale=720:-1 -c:a copy "$file_out"
# crop to w-width:h-height:x-left:y-top, passthru audio
ffmpeg -i "$file" -filter:v crop=w:h:x:y -c:a copy "$file_out"
# crop & encode encode with h265, passthru audio
ffmpeg -i "$file" -filter:v crop=w:h:x:y -c:v libx265 -c:a copy "$file_out"
# crop > scale to max w_max/h_max (-1 keeps proportion), encode h265, passthru audio
ffmpeg -i "$file" -filter:v "crop=w:h:x:y,scale=w_max:h_max530" -c:v libx265 -c:a copy "$file_out"

examples

** create batch & launch it to crope, scale & encode files from file list **

crop="W:H:X:Y"
scale="800x720"
scale="800:-1"
path="/home/nikita/_new/ffmpeg" && path2="/tmp/ffmpeg-batch-$(date +%s)" && while read file; do name="${file##*/}"; path="${file%/*}"; echo "ffmpeg -i \"${file}\" -filter:v "crop=${crop},scale=${scale}" -c:v libx265 -c:a copy \"${path}/${name%.*}-resized.mp4\"" >> "${path2}"; done < <(find "${path}" -name "*.mp4") && chmod +x "${path2}" && echo "Launch: ${path2}"

** create batch & launch it to only encode files searching **

path="/home/nikita/_new/ffmpeg" && path2="/tmp/ffmpeg-batch-$(date +%s)" && while read file; do name="${file##*/}"; path="${file%/*}"; echo "ffmpeg -i \"${file}\" -c:v libx265 -c:a copy \"${path}/${name%.*}.mp4\"" >> "${path2}"; done < <(find "${path}" -name "*.mkv") && chmod +x "${path2}" && echo "Launch: ${path2}"

ffmpeg-ffprobe.md

# get info from file
ffprobe -i $file

ffmpeg-info.md

list

# list all codecs
ffmpeg -codecs
# list all encoders
ffmpeg -encoders
# lis tall decoders
ffmpeg -decoders
# list all formats
ffmpeg -formats

info

# info
ffmpeg -i $file -hide_banner
# Extract frame to image
ffmpeg -accurate_seek -ss $SECONDS -i $FILE -frames:v 1 image.bmp

ffmpeg-trim.md

# Extract frame to image
ffmpeg -accurate_seek -ss $SECONDS -i $FILE -frames:v 1 -quality 100 image.png
# Extract a part a video from -ss for a duration -t
ffmpeg -i "${file}" -ss 00:00:30 -t 00:00:05 -codec copy ${fileout}
# trim outside of -ss & -to
ffmpeg -i "${file}" -ss 00:00:00 -to 00:56:33 -c copy "${fileout}"