Search found 200 matches

by pandy
Tue Jul 30, 2019 10:54 pm
Forum: Usage
Topic: why percentage are stopped in 99.7666666
Replies: 5
Views: 147

Re: why percentage are stopped in 99.7666666

Consider to add to your command-line '-report' - ffmpeg will generate quite detailed log - perhaps this may help to isolate problem.
by pandy
Tue Jul 30, 2019 10:51 pm
Forum: Usage
Topic: Desktop capture
Replies: 3
Views: 118

Re: Desktop capture

As i never tried to use gdigrab then consider my feedback as just general remark - IMHO you can crop and resize your capture so finally you will get 640x480 video. This should be not so complicated.
by pandy
Thu Jul 25, 2019 5:08 pm
Forum: Usage
Topic: Transcode UDP to Different Network
Replies: 4
Views: 273

Re: Transcode UDP to Different Network

As i have no Blackmagic device then it will be quite difficult to me to provide usable (verified as working) command line try first read https://trac.ffmpeg.org/wiki/Capture/Blackmagic (there are some errors in examples provided there). I would personally divide this problem on smaller parts. Firstl...
by pandy
Wed Jul 24, 2019 4:09 pm
Forum: Usage
Topic: Transcode UDP to Different Network
Replies: 4
Views: 273

Re: Transcode UDP to Different Network

test https://superuser.com/questions/1393384 ... hinterface
https://stackoverflow.com/questions/106 ... orks-wrong

on Windows direct access to interface may be not supported by ffmpeg
by pandy
Wed Jul 24, 2019 4:05 pm
Forum: Usage
Topic: Play a video using ffplay Hqx scaler filter?
Replies: 1
Views: 216

Re: Play a video using ffplay Hqx scaler filter?

Didn't checked for ffplay with Hqx in filter chain so you have two options: or use directly ffplay : ffplay -i filename -vf 'hqx=2' and if above will fail then go trough ffmpeg and pipe (useful for complex filters and other filters not supported by ffplay) ffmpeg -an -sn -i filename -vf 'hqx=2' -vsy...
by pandy
Wed Jul 24, 2019 3:58 pm
Forum: Usage
Topic: Add a short video to beginning of existing video WITHOUT REENCODING..?
Replies: 1
Views: 139

Re: Add a short video to beginning of existing video WITHOUT REENCODING..?

should be possible but final effect may depend on player - some will play nice and smoothly other may stop playing
by pandy
Wed Jul 17, 2019 8:52 pm
Forum: Usage
Topic: Splitting an image sequence to folders by scene change
Replies: 2
Views: 379

Re: Splitting an image sequence to folders by scene change

IMHO your question seem to be invalid, every new image is scene change thus seem concept folders grouping "scene" provided by you seem to be not possible with this filter - how i understand purpose of 'gt(scene\,0.4)' filter - compare difference between current and previous video frame i.e. if delta...
by pandy
Mon Jul 15, 2019 5:04 pm
Forum: Usage
Topic: Splitting a video file according to black frames
Replies: 1
Views: 335

Re: Splitting a video file according to black frames

I think this is not easy task, you can save list of black frames but still splitting file will not work if split point belongs to non IDR (I) frame, also closed GOP is almost mandatory to nicely cut video at IDR frame. You may need to navigate to IDR following your cut and cut video at this point an...
by pandy
Mon Jul 15, 2019 4:52 pm
Forum: Usage
Topic: hevc_qsv producing empty file
Replies: 3
Views: 490

Re: hevc_qsv producing empty file

Check this: http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/cloud-computing-quicksync-video-ffmpeg-white-paper.pdf - bit old, also search for current Intel API references (perhaps check ffmpeg hevc_qsv source) - from my perspective only NVidia NVEnc provided working solution...
by pandy
Wed Jul 10, 2019 7:19 pm
Forum: Usage
Topic: Completly cut a frequency range
Replies: 12
Views: 791

Re: Completly cut a frequency range

I recall CD protection by removing (notch filter) frequency 315 or 3150Hz (this was like 25 years ago so perhaps this is not correct frequency but for sure butchering audio by notch filter). And modulating phase with proper way (i.e. https://en.wikipedia.org/wiki/Process_gain) is extremely robust an...
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