Questions tagged [video-encoding]
Specific issues with encoding video to a certain format, also related to [video-conversion]
348
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ffmpeg: limiting to single CPU core when encoding h264
I need to reduce the framerate of some H.264 videos in the background without maxing out my CPU (on Linux). Somehow -threads 1 has no effect at all:
ffmpeg -threads 1 -i 50fps.mp4 -filter:v fps=30 ...
- 403
0
votes
0
answers
28
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Ffmpeg producing worse result than Handbrake using x265 with identical settings
I'm trying to replicate Handbrake settings with ffmpeg, because I'd like to add some metadata and some other things with ffmpeg that Handbrake can not do.
What I've done seems to be close, the ...
- 35
0
votes
0
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15
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Converting Gopro 9 LRV files to Resolve Proxy files
I am trying to convert Go Pro Hero 9 LRV files so I can link them as proxy media in DaVinci Resolve using Ffmpeg.
First, I converted the LRV file to .mp4
LRV file is in 25 FPS so I need to up the ...
0
votes
1
answer
20
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how to combine two ffmpeg commands into one?
I am currently using this command to cut the first 10 seconds of all videos in a folder so the output is the whole video minus first 10 seconds.
FORFILES /M "*.mkv" /c "cmd /c ffmpeg -...
- 1
0
votes
0
answers
50
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ffmpeg Combine 2 video files into one with two audio tracks (different languages)
I have multiple pairs of video files (.mp4) that are basically the same video but in different languages (original english and synchronised german in my case). I know that with ffmpeg I can take ...
- 1,382
0
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0
answers
29
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Decompressing video to limit hardware requirements for playback
I have an un-typical problem. I am trying to find out is it possible to decompress the encoded video file so the playback device is capable of playing two separate 4k streams (low-end GPU). It is ...
- 1
0
votes
1
answer
51
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ffmpeg overlay image on video & trying to keep the original video quality
I'm adding overlay images to a video. and I'm trying to make the output very similar to the original video in order to get the best quality for example if the original video (like the one in the ...
- 17
-1
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1
answer
18
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Does H.265/HEVC macroblock/CTU algorithm compensate for 4:3 letterbox in 1920x1080
Have some source in 1920x1080 but it's actually 4:3 with letterbox. One path is to crop the video to remove the black letterbox and bring it down to 1440x1080 but is that really necessary when encoded ...
- 3,441
0
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0
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34
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FFmpeg reads input from stdin causes warning: thread_queue_size
I have a standalone, customized filter written in python. The filter keep reading from stdin rawvideo and outputs each processed frame as raw bytes. I want to use it for a webcam so data comes from a ...
- 1
1
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0
answers
31
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Cannot start livestream on youtube even though ffmpeg seems to work?
I am a novice on ffpmeg and trying to go for a livestream youtube radio via azuracast. I have created an instance on oracle cloud and installed azuracast there. I can listen to the songs I uploaded in ...
- 111
1
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0
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31
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Having audio and playback issues when attempting to capture DVCPro50 tapes over Firewire with FFmpeg
I've been trying to capture DVCPro50 tapes that were recorded at 23.976 fps over Firewire and I'm unable to come up with a command to get the file to play back properly. I can get a file with audio at ...
- 11
0
votes
1
answer
42
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what's the difference between SAR & PAR in video (Detailed Info)
i want to know what's the big difference between the SAR and PAR, also how ffmpeg automatically deciding the DAR value with the SAR and video width & height.
why the SAR value is so important for ...
- 1
0
votes
0
answers
49
views
FFMPEG failing to render PNGs as ProRes 4444
I have a series of PNGs with transparent background that I would like to render as a video with an alpha channel. I tried running the following ffmpeg command:
ffmpeg -y -r 60 -i frames/%04d.png -c:v ...
- 113
1
vote
0
answers
189
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FFMPEG How to do segments encoding in MXF XDCAM HD422
I'm trying to encode a feed from a Decklink card to MXF XDCAM HD422 by segment, so I use the following command line:
ffmpeg.exe -f dshow -video_size 1920x1080 -r 25 -pixel_format uyvy422 -rtbufsize ...
- 51
1
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0
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59
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How to hard code / embed subtitles of videos inside a folder with FFMPEG
Lets say I have folder A with lots of videos that have TX3G subtitles
Some videos don't have any subtitles
So I need a windows command to process all videos inside this folder and embed / hard code ...
- 601
0
votes
0
answers
148
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What is the suitable H/W compatibility for av-1 encoding
Some videos are transcoded, h264 on ARM machine, h265 on Intel Skylake and av-1 on Intel RocketLake. File savings are better with av1 at the same quality but still at a high computational cost.
Avg ...
- 19
0
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0
answers
18
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xbox 360 not being able to play mp4 files
I'm trying to play a video on my Xbox and even used a handbrake preset made for Xbox 360 which made the video I wanted h264 and 720p. It even had hard-coded subtitles. The preset usually works, but ...
1
vote
0
answers
41
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How to convert .DXA file with ffmpeg
I have .dxa video footage that I'd like to convert to a more standard format with ffmpeg. By doing research I found some people reccomend converting to .yuv first, then convert from .yuv to .mp4. (...
- 13
0
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0
answers
33
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Handbrake videos displayed letterboxed, how to avoid?
I have encoded a DVD with HandBrake as mkv with one of the GENERAL (720p) presets. When I play this on my SONY TV (with the TV's function to play video files) it is shown letterboxed (black bar on top/...
- 1,793
0
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0
answers
160
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FFMPEG Hardware Accelerated NVIDIA Video Encoding
I need to decode a video, analyze frames and encode it back. I am able to do it using FFMPEG C++ without GPU. However, I am having problems with doing it on NVIDIA GPU. So far, I am able to decode the ...
- 1
0
votes
0
answers
85
views
audio and video not correctly sync after concatenation
totally new to video editing in general and in need of some help =)
command that I'm using (windows batch):
(echo file cucca.jpg.mp4 & echo file cucca.fade.mp4 & echo file cucca.jpg.mp4)>...
- 101
1
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0
answers
219
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Using FFPMEG, create a MJPEG stream from a file to simulate a webcam
I'd like to use ffmpeg to simulate a network webcam.
These usually give out an MJPEG feed that plays in a browser.
I want to create a stream like this locally as a test case
for a software I plan to ...
- 393
0
votes
2
answers
33
views
Are watermarks constrained by the quality of the underlay video?
This may be a stupid question but I have to clarify it for my own peace of mind, so bear with. The good news is it's more or less a yes/no question for the FFmpeg/AV experts who know the answer.
Say I ...
- 10.3k
0
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0
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215
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H265 10 bit to H264 8 bit through NVENC looks terrible
I'm currently using FFMPEG run with Sickbeard Mp4 Automator to convert H265 video to H264 since my phone chugs hard playing H265 10 bitvideo. I set it to use NVENC and it's unnoticeable for brighter ...
-1
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1
answer
205
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Why on youtube a 1080p video looks better than 720p ? (My screen max resolution is 720p)
A resolution greater than 720p looks better on my 720p screen . I want a clear and basic answere to understand this.
- 23
0
votes
0
answers
28
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Internal working of vmafmotion filter
The objective was to check how dynamic a given video is and based on that we tweak the bitrate of the video with an internal algorithm, keeping the quality minimally changed and saving the space.
For ...
0
votes
0
answers
51
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Merge Videos & Add a Overlay ffmpeg
i am trying to merge intro & outro videos into my main input video and also add a Overlay image in main input video. i wrote this.
!ffmpeg -i "$introScreen" -i "$inputVideo" -i ...
- 1
0
votes
1
answer
349
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Removal of select subtitle tracks and audio tracks from mkv file in batch
My problem is that I have 2 subtitle tracks, one is named "English signs and songs" and another is called "English full". I also have English and Japanese audio tracks (dual audio)....
0
votes
1
answer
38
views
Segmenting a video results in incorrect timecode data
When I segment a video file into 5-second chunks:
ffmpeg -i input.mp4 -c copy -f segment -segment_time 5 -segment_format mp4 chunk-%d.mp4
Each chunk is exactly 5 seconds long, but when playing the ...
- 1,874
0
votes
0
answers
57
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ffmpeg. Combine two text with two alpha channels
Is it possible to merge these two instructions into one?
I can't do it even though I read FFmpeg Filters Documentation: Introduction.
ffmpeg -y -i in.mp4 -filter_complex
"split[base][text];
[...
0
votes
0
answers
101
views
Encoding video from VFR still images
I am familiar with the use of ffmpeg to encode video from a series of still images (e.g. a sequence of PNG files) where the images are frames at a constant frame rate.
Is it possible to encode a video ...
- 9,800
0
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0
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45
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How to display live frame rate on top of video using ffmpeg?
I want to display live frame rate over video using ffmpeg.I am using following command to get the frame number.Is it possible to get the frame rate as well?.Thanks.
ffmpeg -re -stream_loop -1 -i /dev/...
0
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0
answers
25
views
How to change the thumbnail for large number of video files?
This is what I have.
This is what I want.
I created screencaps for my videos using Video Thumbnails Maker. I want to change the default thumbnail of the mkv file to the jpg file.
When I googled I ...
- 11
1
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0
answers
147
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How can I decrease the V8 processing time when using ffmpeg?
I am working on a project where a lot of videos need to be converted quickly in a fairly good quality. I decided to use ffmpeg and V8 encoding because of the licensing of the codec. h.264 isn't an ...
- 11
0
votes
1
answer
40
views
How was this video made
ok guys I'm genuinely confused how this video was made and was wondering whether anyone could shed light on how this video might have been made or encoded or something.
this video in discord is 51 ...
0
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0
answers
39
views
how can I read all file in a folder and compute PSNR for them using ffmpeg command as a batch file?
I have some videos that I encode them to mp4 file using FFmpeg, now I need to write a batch file that read all the file in a folder and compute PSNR for them and save in separate text file for each ...
- 101
2
votes
2
answers
1k
views
How to cut video in multiple place and combine them without re-encoding using FFMPEG?
Let's say I have 10-minute video, I want to remove 1:00-2:00 and 4:00-5:00
Is that possible to do that on one FFmpeg command? (Other program also welcomed)
Or maybe a command to cut the part that I ...
- 23
0
votes
1
answer
329
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m3u8 to mp4 lossless conversion with VLC or any other free software on Windows
I have read this and several other posts on this site; however, none has answered my question:
I'm aware, that I can convert m3u8 streaming file to the mp4, and I only do this with VLC player on ...
- 101
0
votes
0
answers
72
views
How can I reduce the file size of a video encoded with wmv2 in ffmpeg?
I have some videos of a slide presentation with audio and need to put them in a wmv container. These videos are intended to be viewed with Windows Media Player. I initially made the mistake to use the ...
0
votes
1
answer
226
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how do I read videos from a file and use ffmpeg to save each video with different bit rate?
I want to use the UGC dataset and after reading each video, save each video with a different bitrate and plot the R-D curve. for this aim, I want to use FFmpeg and automatically do the mentioned ...
- 3
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votes
0
answers
15
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Does it make sense to use HEVC instead of H.264 for encoding motion graphics?
I can't seem to find a discussion on this, but would it make sense to encode professional video with HEVC, granted you have an Nvidia GPU? I know the format is usually used in situations where speed ...
- 63
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votes
1
answer
87
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When does FFmpeg error "requested bitrate is too low" only when a second pass is specified?
I'm trying to encoding a file with mpeg4 using ffmpeg on Windows and this works fine:
ffmpeg.exe -y -i input.avi -c:v mpeg4 -q:v 3 -s 640x448 output.avi
Unless I try to encode using two passes:
...
- 756
1
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0
answers
42
views
Screenshots to video using ffmpeg
I have screenshots that are taken .25 seconds apart, that I'm trying to combine into a video. No matter what I try it ends up too fast or too slow/choppy. I've tried the following commands.
ffmpeg -...
- 11
0
votes
1
answer
443
views
How to get AVFoundation devices to have a consistent playback rate (1.0x) W/ FFMPEG on MacOS
Some background: I've been recording my "camera" with QuickTime, but it only allows for two quality options, low quality (720p60fps), or high quality (1080p60fps encoded with ProRes422), as ...
0
votes
3
answers
858
views
How to ffmpeg encode using same codecs and parameters as certain file has?
I need to merge two different video files and I am using LosslessCut for the task. Yet it says that the files need to have the same codecs, dimension, framerate.
Source is mkv V_MPEG4/ISO/AVC with ...
- 393
0
votes
1
answer
142
views
Replace section of audio in a video with FFmpeg
I have a Recording A (video and audio) with a length of about 42 minutes.
I also have a separate Audio Stream B of the same event, which is identical to the audio in the video except it's a) much ...
- 10.3k
1
vote
1
answer
2k
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Improve FFmpeg and NVENC output quality
Is there a way to improve the quality of the output without increasing the bitrate? Also, is there a way to improve the quality of the code using tee?
After reading everything I could find about ...
- 11
0
votes
1
answer
55
views
Converting Videos To Same Resolution Then Joining Them
I have a bunch of clips that I'm trying to combine into one video. The problem is each clip has a different resolution and aspect ratio (different SAR and DAR sometimes too). I'm trying to get ...
0
votes
1
answer
201
views
Replace parts of video with other videos without re-encoding using ffmpeg
I have a video Video1.mkv with audio and video stream. I have 3 other videos V1.mp4, V2.mp4 and V3.mp4 without audio. I would like to keep the audio stream from Video1.mkv and replace the beginning of ...
- 263
0
votes
1
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53
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Two files with apparently the same codecs, but one doesn't work on my TV
So, I have these two files. File 1 works perfectly on my TV, but file 2 doesn't (TV says file format not supported). But checking the MediaInfo, it appears that the codecs are the same. Am I missing ...
