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#FFMPEG BATCH CONVERT WITH LEAST AMOUNT OF COMPRESSION MP4#
#FFMPEG BATCH CONVERT WITH LEAST AMOUNT OF COMPRESSION FREE#

FFmpeg and VP9 Encoding Guide Another option to look at is encoding to VP9 and all of the details are on this FFmpeg trac page.

FFmpeg and H.265 Encoding Guide FFmpeg trac gudelines for encoding to HEVC using the x265 wrapper.

H.264 Video Encoding Guide: 2 Pass Encoding FFmpeg trac article which gives definitive and easily followed information on 2 pass encoding to H.264.

c:v libx265 -x265-params pass=2 -b:v 318k \Īnd this provides a 40mb file with quite reasonable quality.įrom these example you can experiment further by decreasing the required MiB in the formula and observing the subsequent viewing quality. This time the formula would be: (40 MiB * 8192 ) / 734 seconds = ~446 kBit/s total bitrateĤ46 - 128 kBit/s (desired audio bitrate) = 318 kBit/s video bitrateĪnd the FFmpeg 2 pass command line is: ffmpeg -y -i TearsOfSteel_720p_h265.mkv \ Pretty good for a 50% reduction in file size and a huge drop in video bitrate actually!Īnother choice (as suggested by emk2203) is to re-encode the existing HEVC stream with a lower bitrate, this time aiming for 40mb as HEVC claims better quality at a lower bitrate. The resulting file size is 49.4MiB with quite reasonable, but not amazing, viewing quality. c:a libmp3lame -b:a 128k TearsOfSteel_smaller.mp4

#FFMPEG BATCH CONVERT WITH LEAST AMOUNT OF COMPRESSION MP4#

c:a libmp3lame -b:a 128k -f mp4 /dev/null & \ To accomplish this use the following FFmpeg 2 pass command: ffmpeg -y -i TearsOfSteel_720p_h265.mkv \ The formula to calculate the output bitrate for the desired 50mb would then be: (50 MiB * 8192 ) / 734 seconds = ~558 kBit/s total bitrateĥ58 - 128 kBit/s (desired audio bitrate) = 430 kBit/s video bitrate H.264 is widely accepted now and would be an excellent choice for your output video file.

The arrows of course are my own! You then perhaps have 2 really good choices: Inform="General Duration=%Duration/String3%\nFile size=%FileSize/String1%" \ MediaInfo reveals the following for this downloaded file: mediainfo \ You can use this sample file to confirm the following results that I have given and perhaps experiment a little further yourself. I am using the following sample file: wget On the other hand, low values will also result in high bitrate producing high-quality videos at the expense of file size.Ĭonsider a file big_buck_bunny.y4m with a file size of 7 GB.Going from 100mb to 10mb is a slightly unrealistic 90% drop in size but I will give an example of reducing to 50mb creating an H.264 video, which is a more reasonable 50% reduction in size as well as reducing to 40mb using HEVC. The higher the value, the higher the compression, although this may lead to quality loss. The Constant Rate factor (CRF) is the default quality setting for x264 and x265 encoding. Using the CRF of values between 0 and 51 should provide the best compatibility for x265 codecs.

#FFMPEG BATCH CONVERT WITH LEAST AMOUNT OF COMPRESSION FREE#

The x265 codec is a free library for encoding video into H.254/MPEG-H HEVC compression format. In this tutorial, we will use the x265 codec. First, we need to select a small container, an excellent codec to encode the video, a low bitrate, and a low fps.

To make the best decision in video compression, we implement a simple equation. For example, an AVI video file might still be larger than the small file of MP4 type despite being a small size. There is no universal way to reduce a video file size because various file types are not created equal. However, to compress files efficiently, we need to use codecs, bitrate, container, and fps. The command above will convert the file from the specified format to the output format.