[FFmpeg-user] mp4 files size problem

Daniel 5960761 at gmail.com
Thu Sep 7 19:52:04 EEST 2017

Thank you for the reply . I think you are right about the hardware 
encoder . I have encoded the video with libx264 and the output file was 
189MB. Do you know what is the difference between nvenc_h264 and 
h264_nvenc  encoders ?

On 7.09.2017 17:09, Cley Faye wrote:
> 2017-09-07 15:57 GMT+02:00 Daniel <5960761 at gmail.com>:
>> Hello Everyone,
>> I have tried to convert some videos to mp4 format what has surprised me
>> was the size of the videos, After the conversion some videos were 2,3,4
>> times bigger then the original wmv files. Here is the command i used to
>> convert :  /usr/local/bin/ffmpeg -i video500.wmv -c:a libfdk_aac -c:v
>> nvenc_h264  video500.mp4 ; After this command the mp4 file is 630MB  and
>> the wmv file is 150MB (you can find attached the ffprobe to bothe files).
>> If you can suggest any way on how to keep the quality and make the mp4
>> files smaller please let me know .
>> ps: On some mp4 videos the bitrate has doubled have no idea why ?
> ​If you don't supply your own settings, ffmpeg (and/or the underlying
> codec) will assume some default values, not necessarily in compliance with
> the input. In your case, you probably want (at least) to set the bitrate.
> Also, I think that hardware encoder tend to produce bigger file for same
> quality (and worse quality for same size), but this might not be accurate
> anymore.​
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