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@lukehedger
Last active February 2, 2023 16:52
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Compress mp4 using FFMPEG
$ ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 output.mp4
@ChiaraLinaCasadei
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It worked excellently

At first Powershell didn't recognize "ffmpeg" as valid, but I made a little change suggested by @Patacon13 , I hope it helps people with the same issue

./ffmpeg -i input.mp4 -vcodec h264 -acodec mp3 out.mp4

125mb to 57.7mb

@HinaAroraByjus
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Its not work for me, I want reduce an webm video and 616mb to 480mb and very time spended =/

Hi,
I am also working on Webm file. But I need need end result in mp4.
Should I convert it in mp4 first and then reduce the size ??

@HinaAroraByjus
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For webm file, it didn't work as expected.
Input SIze - 9144478
Output Size - 20795660

@ArnabXD
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ArnabXD commented Sep 16, 2021

For webm file, it didn't work as expected.
Input SIze - 9144478
Output Size - 20795660

Probably this is the reason. I noticed this to be true many times

WebM vs MP4: File Size and Quality

But since WebM is specially designed for the Internet, the compression ratio of WebM is generally higher than MP4 in theory, which leads to more original quality loss than MP4. And the file size of WebM is a little bit smaller than MP4.

https://www.winxdvd.com/answers/webm-vs-mp4.htm

@HinaAroraByjus
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For webm file, it didn't work as expected.
Input SIze - 9144478
Output Size - 20795660

Probably this is the reason. I noticed this to be true many times

WebM vs MP4: File Size and Quality

But since WebM is specially designed for the Internet, the compression ratio of WebM is generally higher than MP4 in theory, which leads to more original quality loss than MP4. And the file size of WebM is a little bit smaller than MP4.

https://www.winxdvd.com/answers/webm-vs-mp4.htm

Thanks ArnabXD,
I have change my approach little.
I was converting the puppeteer stream into mp4 and wanted to stitch the local files and then upload to S3.

Now, I am using AWS Media Converter to perform the same on S3 bucket itself.

@justCatalyst
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Compressed from 14.1 mb to 4.9 mb. But lost sound( how can i fix it? Any options?

the output for audio is mp2 - maybe you don't have a codec for that?

@143maha
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143maha commented May 8, 2022

how to live telecast 24/7

@abdennour
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abdennour commented May 27, 2022

WORKS EXCELLENT

ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4

for MacOs, you need to preserve compatibility encoding H.265/HEVC for QuickTime:

ffmpeg -i input.mp4 -c:v libx265 -preset fast -crf 28 -tag:v hvc1 -c:a eac3 -b:a 224k output.mp4

@dotkt
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dotkt commented Jun 8, 2022

thank you

@Thomashighbaugh
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ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4
3.6 Gb to 556 Mb, great quality 1st_place_medal
ffmpeg -i input.mp4 -s 1280x720 -acodec copy -y output.mp4
3.6 Gb to 62 Mb, quality "good enough"/acceptable +1
ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -acodec mp3 output.mp4
3.6 Gb to 30 Mb, very shitty quality hankey

Thanks worked beautifully for me on Linux, really appreciate tip!

@deroverda
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ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4
3.6 Gb to 556 Mb, great quality 1st_place_medal
ffmpeg -i input.mp4 -s 1280x720 -acodec copy -y output.mp4
3.6 Gb to 62 Mb, quality "good enough"/acceptable +1
ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -acodec mp3 output.mp4
3.6 Gb to 30 Mb, very shitty quality hankey

Thanks worked beautifully for me on Linux, really appreciate tip!

tried the 1st_place_medal ffmpeg command AKA ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4

before: 49 mb
after: 63 mb

in other words, not gold medal for me. using win 10.

@mcagabe19
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ffmpeg -i input.mp4 -vcodec libx265 -acodec aac -crf 28 output.mp4
best way (used termux)

@gideonseven
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gideonseven commented Aug 16, 2022

Commands using Linux with ffmpeg to shrinking big MP4 video file to smaller sizes

ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4
3.6 Gb to 556 Mb, great quality 🥇
ffmpeg -i input.mp4 -s 1280x720 -acodec copy -y output.mp4
3.6 Gb to 62 Mb, quality "good enough"/acceptable 👍
ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -acodec mp3 output.mp4
3.6 Gb to 30 Mb, very shitty quality 💩

using

ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4

from 52MB to 28MB

works well for me on windows 11, thank you @tincho

@async-dime
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thankyou!
using ffmpeg -i input.avi -c:v libx264 -crf 18 output.mp4
input: 1.4 GB
output: 132.2 MB

@ligantx
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ligantx commented Sep 4, 2022

Commands using Linux with ffmpeg to shrinking big MP4 video file to smaller sizes

  • ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4
    • 3.6 Gb to 556 Mb, great quality 🥇
  • ffmpeg -i input.mp4 -s 1280x720 -acodec copy -y output.mp4
    • 3.6 Gb to 62 Mb, quality "good enough"/acceptable 👍
  • ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -acodec mp3 output.mp4
    • 3.6 Gb to 30 Mb, very shitty quality 💩

good enough worked fine for me..To my "average human" eye, i coudlnt find any real difference with the original video compared side by side (original: 1gb to good enough: 296mb)

Edit:
if you wanna go lower try changinng -b:v value e.g.:
ffmpeg -i input.mp4 -vcodec h264 -b:v 700k -acodec mp3 output.mp4
and if you don't want sound try:
ffmpeg -i input.mp4 -vcodec h264 -b:v 700k -an output.mp4

My experiment:

  • ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -an output.mp4
    32MB to 3.6MB
  • ffmpeg -i input.mp4 -vcodec h264 -b:v 200k -an output.mp4
    32MB to 742KB

@basicbh
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basicbh commented Sep 17, 2022

dont forget the FPS,its amazing.

@MdHassan413
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I'm passing media from Postman and getting an error.
[WinError 2] The system cannot find the file specified
I'm compressing media like this :
subprocess.run(f'ffmpeg -i {media} -vcodec h264 -acodec {file_type} temp_location/{new_uuid}')

@alyfreym
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alyfreym commented Jan 4, 2023

How to compress mp4 file with I-frames only?

An I-frame or a Key-Frame or an Intra-frame, how to set this options?

@KinKin2023
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DVDFab Video Converter, VideoSmaller, Free Video Compressor and other software can compress MP4.

https://dvdfab.org/video/compress-mp4.htm

This article introduces 10 MP4 compression software

@lnfel
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lnfel commented Jan 9, 2023

ligantx experiment is the most efficient (tested on macOS), 700k for bitrate seems to be a good measure for maintaining quality while lowering file size:

ffmpeg -i input.mp4 -vcodec h264 -b:v 700k -acodec mp3 output.mp4

@KaspianDev
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DVDFab Video Converter, VideoSmaller, Free Video Compressor and other software can compress MP4.

https://dvdfab.org/video/compress-mp4.htm

This article introduces 10 MP4 compression software

Watch out this is probably some shitty scam

@cabiste69
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i'm gonna add some notes here

  1. in the time of writing this (jan 2023) you don't need to specify h264 as the video codec in ffmpeg when the output is mp4 since that's the default codec
  2. for audio it's better to specify the bitrate rather than the codec, 96Kb is good enough -b:a 96k
  3. not all videos will look good with a video bitrate of 700kb it depends on the resolution, the original codec used and whether there's a lot of movement / particles

I'd recommend that you first let ffmpeg compress it automatically without any arguments ffmpeg -i input.ext output.mp4

  • if the output is not enough then use 2/3 of the original video bitrate with -b:v and keep lowering until you reach a desired size
  • you can lower the resolution with -vf scale=1280:720
  • if you only want to save your video on your pc then use the new mp4 codec 265 -c:v libx265, it has better compression, and just ike 264, nearly lossless. the issue with this is that it's still not widely adapted and sites like discord can't play it

@gideonseven
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Commands using Linux with ffmpeg to shrinking big MP4 video file to smaller sizes

  • ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4
    • 3.6 Gb to 556 Mb, great quality 🥇
  • ffmpeg -i input.mp4 -s 1280x720 -acodec copy -y output.mp4
    • 3.6 Gb to 62 Mb, quality "good enough"/acceptable 👍
  • ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -acodec mp3 output.mp4
    • 3.6 Gb to 30 Mb, very shitty quality 💩

good enough worked fine for me..To my "average human" eye, i coudlnt find any real difference with the original video compared side by side (original: 1gb to good enough: 296mb)

Edit: if you wanna go lower try changinng -b:v value e.g.: ffmpeg -i input.mp4 -vcodec h264 -b:v 700k -acodec mp3 output.mp4 and if you don't want sound try: ffmpeg -i input.mp4 -vcodec h264 -b:v 700k -an output.mp4

My experiment:

  • ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -an output.mp4
    32MB to 3.6MB
  • ffmpeg -i input.mp4 -vcodec h264 -b:v 200k -an output.mp4
    32MB to 742KB

thanks, it works.
using || -b:v 1000K || ---- from 2MB to 1MB mp4 file

@drinkmorewaters
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drinkmorewaters commented Jan 14, 2023

./ffmpeg -i input.mp4 -c:v libx265 -preset ultrafast -crf 28 -c:a aac -b:a 250k output.mp4

This is better for h265, it's fast and should reduce the file size by 50-70% if you want better video, change the ultrafast to fast or change the -crf to a lower number like 24

If you want to change from 4K to 1080P, add -s 1920x1080 after the -i input.mp4

@dwbapst
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dwbapst commented Jan 18, 2023

./ffmpeg -i input.mp4 -c:v libx265 -preset ultrafast -crf 28 -c:a aac -b:a 250k output.mp4

This is better for h265, it's fast and should reduce the file size by 50-70% if you want better video, change the ultrafast to fast or change the -crf to a lower number like 24

If you want to change from 4K to 1080P, add -s 1920x1080 after the -i input.mp4

This worked pretty well for me -- converted a 323 MB Zoom recording to a 81 MB file. without reducing resolution, is there anything more one can do to further shave off the file size?

@clairechen7
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Commands using Linux with ffmpeg to shrinking big MP4 video file to smaller sizes

  • ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4
    • 3.6 Gb to 556 Mb, great quality 🥇
  • ffmpeg -i input.mp4 -s 1280x720 -acodec copy -y output.mp4
    • 3.6 Gb to 62 Mb, quality "good enough"/acceptable 👍
  • ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -acodec mp3 output.mp4
    • 3.6 Gb to 30 Mb, very shitty quality 💩

Thanks for sharing, really helpful!

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