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FFMPEG QUESTIONS

mmpeg changing the bitrate and file size of resulting file
mmpeg changing the bitrate and file size of resulting file
I hope this helps . I'm using ffmpeg within a Python script (using mmpeg-python) in order to change metadata values but the bitrates and file size are also changed in the resulting video (bitrates are 'Velocidad de datos' and 'Velocidad de bits', sor
TAG : ffmpeg
Date : January 12 2021, 07:00 PM , By : Saqbach
What is the difference between libx264 and h264_nvenc?
What is the difference between libx264 and h264_nvenc?
I hope this helps . h264_nvenc uses the NVidia hardware assisted H.264 video encoder. libx264 is a software (CPU) based H.264 encoder.I would guess that libx264 delivers better quality than h264_nvenc for the same bitrate.
TAG : ffmpeg
Date : January 11 2021, 03:26 PM , By : Sid
What does “has_b_frames” mean in FFprobe output?
What does “has_b_frames” mean in FFprobe output?
seems to work fine has_b_franes in general indicates whether there's video delay i.e. is the frame presented in same order as decoding. The actual attribute being referenced depends on the specific bitstream format. For H264, it's the maximum expecte
TAG : ffmpeg
Date : January 02 2021, 06:48 AM , By : ZyNc ELiTeZ
ffmpeg 0.5 flv to wav conversion creates wav files that other programs won't open
ffmpeg 0.5 flv to wav conversion creates wav files that other programs won't open
I hope this helps you . Try having ffmpeg directly operate on the input/output files, instead of piping data into and out of ffmpeg:ffmpeg -i INPUT_FILE.FLV -vn -acodec pcm_s16le -ar 16000 -ac 1 -f wav OUTPUT_FILE.WAV
TAG : ffmpeg
Date : January 02 2021, 06:48 AM , By : p2sk
encode video in reverse?
encode video in reverse?
seems to work fine No, it isn't possible using ffmpeg to encode a video in reverse without dumping it to images and then back again. There are a number of guides available online to show you how to do it, notably: http://ubuntuforums.org/showthread.p
TAG : ffmpeg
Date : January 02 2021, 06:48 AM , By : Rickipedia
How to process .ts files used by flowplayer?
How to process .ts files used by flowplayer?
may help you . EXT-X-KEY:METHOD=AES-128,URI="https://cloudflare2.jove.com/CDNSource/hls/59612/59612.key"
TAG : ffmpeg
Date : December 24 2020, 11:01 PM , By : Waymon
FFMPEG: How to output image2 format into a tcp/udp socket?
FFMPEG: How to output image2 format into a tcp/udp socket?
this will help The normal image2 muxer expects to write to one or more image files. Use the image2pipe muxer.
TAG : ffmpeg
Date : December 22 2020, 03:30 PM , By : user3059289
ffmpeg HLS timing broken because of broken .ts file
ffmpeg HLS timing broken because of broken .ts file
it helps some times You must modify the playlist and set a EXT-X-DISCONTINUITY after the broken file.
TAG : ffmpeg
Date : December 22 2020, 02:01 AM , By : user3056966
How to create a 720x480 blank mpg
How to create a 720x480 blank mpg
around this issue In order to join some video clip(720x480 [SAR 8:9 DAR 4:3]) and leave two seconds blank gap between each one, i try to make an blank clip by code , Set the SAR during creation.
TAG : ffmpeg
Date : December 06 2020, 11:17 PM , By : user3049338
Changing the background color of the movie while using tpad and adelay
Changing the background color of the movie while using tpad and adelay
I hope this helps . i want to change the background color of a movie while using tpad and adelay commands. it is now black ( until the movie starts). , Use the color option for tpad.tpad=start_duration=5:color=blue.
TAG : ffmpeg
Date : December 05 2020, 12:02 PM , By : user3046992
How to filter motion vectors?
How to filter motion vectors?
To fix the issue you can do Remember that codecview will display the motion vectors from the encoded file, so if you denoise that file after decoding (such as ffplay [..] -vf hqdn3d), then the motion vectors aren't actually affected by the denoising,
TAG : ffmpeg
Date : December 01 2020, 04:42 PM , By : tomas_vojta
ffmpeg adding ass subtitles: error initializing filter 'subtitles' with args ''
ffmpeg adding ass subtitles: error initializing filter 'subtitles' with args ''
Hope this helps Okay I fixed it already by doing the following instead of -vf ... :-filter_complex "subtitles='[X] File - 1 [Y].mkv'"
TAG : ffmpeg
Date : November 28 2020, 03:01 PM , By : Charlie Harper
FFMPEG how to add dummy audio during video splicing
FFMPEG how to add dummy audio during video splicing
hop of those help? Useffmpeg.exe -i 1.mov -i 2.mov -f lavfi -t 1 -i anullsrc -filter_complex "[0:v]scale=1920:1080[v0];[1:v]scale=1920:1080[v1];[v0][2:a][v1][1:a] concat=n=2:v=1:a=1[v][a]" -map "[v]" -map "[a]" out.mp4
TAG : ffmpeg
Date : November 28 2020, 12:01 PM , By : user3042573
ffmpeg how to calculate complete frame ['I' frame ] from [ 'P' frame ]. It is conceptually correct?
ffmpeg how to calculate complete frame ['I' frame ] from [ 'P' frame ]. It is conceptually correct?
hop of those help? P frame does not depend on previous P frame, it depends on previous picture. So, for example, if you have IPP, you need both I and second P to use the third P, not just the second P.decode_video2 does the interpolation for you and
TAG : ffmpeg
Date : November 22 2020, 11:12 AM , By : Justin H
Converting Gif to mp4 where the mp4 is longer than animated gif?
Converting Gif to mp4 where the mp4 is longer than animated gif?
I wish this help you FFmpeg, by default, suppresses looping of GIFs but you can disable that behaviour.
TAG : ffmpeg
Date : November 11 2020, 03:01 PM , By : ki min kim
How to sync multiple rtsp inputs in ffmpeg?
How to sync multiple rtsp inputs in ffmpeg?
around this issue Try adding -fflags nobuffer -flags low_delay -strict experimental before -i. you may see few currupted frames at the beginning since there is no reference frame.
TAG : ffmpeg
Date : October 06 2020, 09:00 PM , By : Luis
ffmpeg compilation with --arch=x86_64 always compiles with x86
ffmpeg compilation with --arch=x86_64 always compiles with x86
hop of those help? Don't worry you've got an x86_64 ffmpeg. The mentioned message is normal for x86_64 compilation as ffmpeg configure combines all x86 architectures in one 'x86' arch:
TAG : ffmpeg
Date : October 06 2020, 08:00 PM , By : Peter Tippett
ffmpeg same bit rate in hls file across resolutions
ffmpeg same bit rate in hls file across resolutions
fixed the issue. Will look into that further Add the -b:v option per output with the appropriate stream specifiers like your other options. The resulting BANDWIDTH values will change accordingly.Other stuff:
TAG : ffmpeg
Date : October 06 2020, 05:00 PM , By : Adam Shatzkamer
Speed up video encoding
Speed up video encoding
seems to work fine The question is if I could always use this idea to produce html5 compatible video
TAG : ffmpeg
Date : October 04 2020, 08:00 AM , By : Paul Beck
How to decode MP4 file use GPU use ffmpeg.autogen?
How to decode MP4 file use GPU use ffmpeg.autogen?
I wish this helpful for you You need change VideoStreamDecoder class:First you need to configurate your AVCodecContext with using HWDevice of your machine. Something like this:
TAG : ffmpeg
Date : October 03 2020, 06:00 PM , By : shinsenai
Video capture by FFMPEG with closed captions data
Video capture by FFMPEG with closed captions data
Does that help Encoding EIA-608 captions into the video file has been an outstanding feature request for some time. There is currently an open issue for adding support to ffmpeg and it has not yet been addressed.This request comes up on mailings list
TAG : ffmpeg
Date : October 03 2020, 03:00 AM , By : MaxM
FFmpeg can't stream AAC files from stdin?
FFmpeg can't stream AAC files from stdin?
Hope that helps The m4a is a MPEG-4 Part 14 (MP4) container and not raw AAC and might require seeking. You might be able to pipe it if the moov atom is placed at the beginning of the file (ie. when using faststart) but you're better off with the inpu
TAG : ffmpeg
Date : October 02 2020, 12:00 PM , By : rainu
how to solve ffmpeg video merging complain about parameters mismatching
how to solve ffmpeg video merging complain about parameters mismatching
should help you out The concat filter is complaining about the mismatch in resolutions between the two videos. Resize one of them to the size of the other.Below, I rescale and pad the intro to the size of the main video.
TAG : ffmpeg
Date : October 01 2020, 11:00 PM , By : Mark Blackwell
FFMPEG curtain effect slideshow from images
FFMPEG curtain effect slideshow from images
I wish did fix the issue. I have bunch of images that i have to convert to slideshow with curtain effect. currently i am running this command that convert images to video.
TAG : ffmpeg
Date : September 20 2020, 01:00 AM , By : junkverse
UDP Receiver needs to start before udp sender
UDP Receiver needs to start before udp sender
around this issue You need to send SPS/PPS data periodically if you want to have random access. If you don't, this data will only get send in the very beginning. This information is critical for decoding a H.264 stream. Consider adding h264parse befo
TAG : ffmpeg
Date : September 14 2020, 10:00 AM , By : pandurang Chavan
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