Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

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

[FFmpeg-user] Convert flv to mp4. Bad video quality

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? Best regards, Prof. Flavio Sartoretto gia' Docente di Calcolo Scientifico Universita' Ca' Foscari Venezia

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

Am 28.05.21 um 11:44 schrieb Michael Koch: 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

[FFmpeg-user] Capture the screen region with specific delayed time.

On Ubuntu 20.04, I want to capture the screen region which I click some mouse actions on. Can I do this with ffmpeg? Regards -- Assoc. Prof. Hongyi Zhao Theory and Simulation of Materials Hebei Vocational University of Technology and Engineering NO. 552 North Gangtie Road, Xingtai, China

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

Im not sure about the FFMPEG command but couldn't you check if the original FLV is already h.264 video and AAC audio and directly copy? On Fri, May 28, 2021, 4:31 AM Flavio Sartoretto < flavio.sartoretto1...@gmail.com> wrote: > I use ffmpeg in order to convert fname.flv video to mp4: > ffmpeg -i

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

On 2021-05-28 21:19, Michael Koch wrote: Am 28.05.2021 um 17:18 schrieb Carl Eugen Hoyos: 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

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

Thank you Carl for your clarification. I obtain good results using -q:v 4 Best, Prof. Flavio Sartoretto gia' Docente di Calcolo Scientifico Universita' Ca' Foscari Venezia On Fri, May 28, 2021 at 5:24 PM Carl Eugen Hoyos wrote: > > > > > > > Am 28.05.2021 um 11:44 schrieb Michael Koch : > > > >

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

Thank you Ulf for your suggestion. Michael Koch suggested me to use -q:v 1, which is ok! Thanks anyway! Prof. Flavio Sartoretto gia' Docente di Calcolo Scientifico Universita' Ca' Foscari Venezia On Fri, May 28, 2021 at 12:02 PM Ulf Zibis wrote: > > > Am 28.05.21 um 11:44 schrieb Michael Koch:

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

> Am 28.05.2021 um 11:44 schrieb Michael Koch : > > 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

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

Thank you very much, Michael! It works! Prof. Flavio Sartoretto gia' Docente di Calcolo Scientifico Universita' Ca' Foscari Venezia On Fri, May 28, 2021 at 11:44 AM Michael Koch wrote: > > Am 28.05.2021 um 11:25 schrieb Flavio Sartoretto: > > I use ffmpeg in order to convert fname.flv video to

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

Thank you Rick. Michael Koch suggested me to use -q:v 1, which is ok! Thanks anyway! Prof. Flavio Sartoretto gia' Docente di Calcolo Scientifico Universita' Ca' Foscari Venezia On Fri, May 28, 2021 at 2:58 PM Rick Keniuk wrote: > > Im not sure about the FFMPEG command but couldn't you check if

Re: [FFmpeg-user] Convert flv to mp4. Bad video quality

Am 28.05.2021 um 17:18 schrieb Carl Eugen Hoyos: 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. This is an important