ffmpeg: Video convert m2ts to mp4, mp4 to webm, mp4 to ogv, mp3 wav hz, extract frames #tools

README.MD

video convert m2ts to mp4, mp4 to webm, mp4 to ogv

mp4 to mp4 (medium)

ffmpeg -i input.mp4 -b 1000000 output.mp4

m2ts to mp4

ffmpeg -i input.m2ts -vcodec libx264 -crf 20 -acodec ac3 -vf "yadif" output.mp4

mp4 to webm (high)

ffmpeg -i input.mp4 -aq 5 -ac 2 -qmax 25 -threads 2 output.webm
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libopus output.webm

mp4 to webm (medium)

ffmpeg -i input.mp4 -aq 5 -ac 2 -qmax 35 -threads 2 output.webm

mp4 to ogv (high)

ffmpeg -i input.mp4 -vcodec libtheora -acodec libvorbis -q:v 6 -q:a 5 output.ogv

mp4 to ogv (medium)

ffmpeg -i input.mp4 -vcodec libtheora -acodec libvorbis -q:v 2 -q:a 4 output.ogv

convert m4a to mp3

single file

ffmpeg -i foo.m4a -acodec libmp3lame -aq 2 bar.mp3

in current folder

for f in *.m4a; do ffmpeg -i "$f" -acodec libmp3lame -aq 2 "${f%.m4a}.mp3"; done

recursively in all folders

find . -name '*.m4a' -exec ffmpeg -i {} -acodec libmp3lame -aq 2 {}.mp3 \;

windows

for /R %f in ("*.m4a") do (ffmpeg.exe -i "%~f" -acodec libmp3lame -aq 2 "%~pf%~nf.mp3")

convert wav files in folder to mp3 and ogg (+ increasing the volume)

rm -f ~/audio/files/*.mp3;
rm -f ~/audio/files/*.ogg;
cd ~/audio/files/;
for i in *.wav; do ~/ffmpeg/ffmpeg -y -i $i -af volume=2.5 -ab 192k ${i/%.wav/.mp3}; done;
for i in *.wav; do ~/ffmpeg/ffmpeg -y -i $i -af volume=2.5 -aq 10 ${i/%.wav/.ogg}; done;

download and convert akamai hd m3u8 file to mp3

ffmpeg -i "https://***.akamaihd.net/i/***/master.m3u8" -c copy input.ts
ffmpeg -i input.ts -c:v libx264 -c:a copy output.mp4

convert wav to mp3

no options

ffmpeg -i input.wav -acodec libmp3lame output.mp3

with options (no video, set frequency and audio channels)

ffmpeg -i input.wav -vn -ar 44100 -ac 2 -ab 192k -f mp3 output.mp3

convert mp3 to rate 9khz and mono 16bit PCM wav

ffmpeg -i input.mp3 -ac 1 -ar 8000 -acodec pcm_s16le output.wav

extract first/last frame

ffmpeg -ss 0 -i input.mp4 -frames:v 1 first.png
ffmpeg -sseof -3 -i input.mp4 -update 1 -q:v 1 last.png

cut off

cut off all before 5s of mp4

ffmpeg -i input.mp4 -ss 3.5 -c:v libx264 -c:a aac -strict experimental output.mp4

cut off from 10s of mp4

ffmpeg -i input.mp4 -t 10 -c copy output.mp4

concatenate multiple mp4 files

same codecs/size

ffmpeg -f concat -safe 0 -i <(for f in ./*.mp4; do echo "file '$PWD/$f'"; done) -c copy output.mp4

different codecs/size

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "[0:v:0][1:v:0]concat=n=2:v=1[outv]" -map "[outv]" -c:v libx264 -preset fast -crf 23 output.mp4

no audio at video 2 and different sizes

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "[0:v:0]scale=1080:1468,setsar=1[v1]; [1:v:0]scale=1080:1468,setsar=1[v2]; [v1][v2]concat=n=2:v=1[outv]" -map "[outv]" -map 0:a:0 -c:v libx264 -preset fast -crf 23 -c:a aac -b:a 128k output.mp4

Yes, this is what I usually use:

ffmpeg -i input.m2ts -c copy output.mp4 

But I have issues too with frame rates, and some mp4 (not all) have the aliasing I'm talking about in the first message. I have less when I remove the copy argument, to reencode the video, but it's a pain in the ass when I have multiple videos to convert (it takes time and CPU power).
I don't know if the cause is the convertion, or ffmpeg itself.
Thanks for the confirmation anyway!

Hey the m2ts to mp4 conversion doesn't include the audio.

Any suggestions for what I could try?

In my case,

ffmpeg -i dolbyTest-Win10-Final.m2ts -vcodec libx264 -crf 20 -acodec ac3 -vf "yadif" test.mp4

seems to be working well and it's not messing up the 5.1

Hey the m2ts to mp4 conversion doesn't include the audio.
Any suggestions for what I could try?

In my case,

ffmpeg -i dolbyTest-Win10-Final.m2ts -vcodec libx264 -crf 20 -acodec ac3 -vf "yadif" test.mp4

seems to be working well and it's not messing up the 5.1

Regarding working command above, this new command below is messing up my front/rear panning. It feels like everything is only coming out of the front speakers in test2.webm:

 ffmpeg -i test.mp4 -af "channelmap=channel_layout=5.1" test2.webm

https://superuser.com/questions/1868857/convert-5-1-surround-m2ts-or-mpg-file-to-webm-with-minimal-audio-degradation