> Am 28.05.2021 um 11:44 schrieb Michael Koch <astroelectro...@t-online.de>:
>
> Am 28.05.2021 um 11:25 schrieb Flavio Sartoretto:
>> I use ffmpeg in order to convert fname.flv video to mp4:
>> ffmpeg -i fname.flv -c:v mpeg4 -copyts -loglevel verbose fname.mp4
>>
>> The video quality of my output is bad. How can I improve it?
>
> Add -q:v 1 to your command line. The number does specify the compression
> ratio. 0 ist best quality and 9 is highest compression.
This is (nearly) completely wrong:
9 is still high quality, highest compression happens at a much higher value.
Old MEncoder documentation recommends not use a value lower than 2, sane values
start between 5 and 10.
To Flavio:
The answer to your question depends on your use case: Setting a constant
quantiser as suggested leads to output more similar to constant quality as is
possible with x264 (and newer encoders) and is likely a good idea nowadays, the
alternative is setting a bitrate, this should be combined with two-pass
encoding and leads to the best quality - file size relation (which should be
less relevant if you don’t write to a CD).
Carl Eugen
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