Questions tagged [codec]
A 'coder-decoder' computer program capable of encoding and/or decoding a digital data stream or signal.
238
questions
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HEVC vs H264 video file size
I am doing some experiments on the file size of recorded videos in HEVC vs the ones recorded in H264 using a simple Android app that I developed. My impression was that videos recorded in HEVC should ...
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17 views
Change video codec when capturing video in Android
I trying to write a simple app in Android that captures video and then sends it over the network. Looking at the recorded videos on my device, apparently it uses H264 AVC1 by default. I know my ...
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2answers
71 views
How can I find out which chroma subsampling (if any) is used in a video file?
If I have a video file, how can I find out which kind of chroma subsampling (4:2:2, 4:2:0), if any, that is used?
What I've tried so far:
If I open the codec info in VLC I can see that it's in the ...
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1answer
21 views
Transcoding from AVC to ProRes: Are there any negatives that would happen to the footage?
I've shot a short film and the files are using AVC codec within an .MP4 container. I'm wondering whether transcoding to say Quicktime (ProRes 422 HQ) would have any negatives that come with it.
I ...
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42 views
ffmpeg video command still with black screen
I am using a screen capture component in delphi that I will use in my program, by enabling the recording option with the command ffmpegLGPL.exe -re -i% PIPE% -c: v h264 -threads 8 -profile: v baseline ...
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16 views
Increase video recording efficiency on smartphones
I am working on a smartphone app that records a video and uploads it to the cloud. Now I'm trying to find ways to increase the performance and quality of videos. Given sometimes the bandwidth of the ...
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7 views
Adapt video recording and playback according to the device
We have a prototype that records video and shares it to other devices to play. How can we customize the video recording and playback experience, considering mobile vs. desktop and the bandwidth ...
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1answer
68 views
ffmpeg and ffprobe existing library or an add-on, pros/cons of building one myself
I work with video creation, animation, or fix video elements for several broadcasters in my area. My pipeline includes ffmpeg suite of libraries, and I have written one plugin specifically for ffmpeg ...
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23 views
Ensuring quality when capturing miniDV tapes for storage with QuickTime
I have a load of old miniDV tapes shot in Standard Definition, and a small consumer DV camera, connected (via Firewire) to an iMac (Big Sur) via a couple of adapters (Thunderbolt to FireWire).
I ...
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18 views
Can anyone tell explain these UTVideo settings to me?
I am on the lookout for an alternative Lagarith Lossless as some games do not really agree with Lagarith Lossless. I did some digging and learned of UTVideo on the internet but the thing is, UTVideo ...
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29 views
How do you batch resizes of Genesis videos in FFMPEG?
I am trying to a create 4:3 video upscale encodes with Sega Genesis videos that are usually around 320 x 224 using FFMPEG. While I had been advised to use FFMPEG (and AVISynth) in the past, it was ...
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586 views
ffmpeg to convert .avi to .mp4 results in error: Could not find tag for codec dvvideo in stream #0, codec not currently supported in container
I'm trying to convert .avi files to .mp4 using ffmpeg, as lossless-ly as possible.
I tried this command:
ffmpeg -i filename.avi -c:v copy -c:a copy -y filename.mp4
and received this output:
...
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28 views
Alternative to XVID?
What codecs are good for upscale encoding while saving space and preserving the quality of the video? I am looking for something that is good with animation, gaming, 2D, etc.
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2answers
45 views
Why is my video file so large when there isn't any video?
Background
I am using Final Cut Pro X on a new M1 MacBook Pro (16gb of RAM) on AC power, and I have noticed that when I export the video project (share) the resulting video file is so much larger than ...
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7 views
Deduplicating video codec
Say I have a 10 second video that I want to loop 1000 times (not just loop-play it in its presentation form, but have the actual video file be 10000 seconds long). This video will contain the same ...
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185 views
Encode VP9 in mov container with pcm audio
Davinci Resolve's supported Codecs list shows it only supports decoding VP9 if placed in an mov container. Add to that the audio limitations also present on the Linux version and mov is somewhat ...
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2answers
46 views
What is the difference between lossless and lossy formats?
What exactly are the differences between lossless and lossy codecs? And is one better format better than the other or is it mostly relative?
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31 views
Triming ogg files to an exact number of samples
Let me begin by saying that I'm not sure on which site on the Stack Exchange network I should post this, as the central theme is essentially codec internals.
Background
I would like to be able to ...
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0answers
16 views
Frame rate (FPS) multiplied by duration (sec) isn't equal to total frames
On a YouTube video stats, apparently, the frame rate is 30 fps:
Total video length is 1:32 i.e. 92 sec.
Total frames = frame rate x time
Total frames = 30 x 92 = 2760
So why are frames reported as ...
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0answers
13 views
Efficient (small size) lossless encoding of video where just few localised pixels changes every so often
I want to record efficiently (space-wise) a screen area which has certain charateristics, akin to a video presentation of a software :
it is a window on my computer where a program runs. Not a video, ...
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45 views
How to decode a 2D video with H264 by FFPMEG?
For one of my projects (https://www.cs.tau.ac.il/~amir1/PS/3d.pdf) I need to use FFMPEG, but I am entirely new to C++ so diving into it will take a lot of time. Is there any code/handy resource ...
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1answer
166 views
What is the difference between .mts and .mp4 video files?
I know that .mts video files use MPEG-4 video compression. But why then don't they just have the .mp4 file name extension?
Since they don't, this means they are not digitally nor conceptually ...
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22 views
recording uncompressed or > 150000 kb/S video on a smartphone or tablet
Is it possible to record uncompressed or > 150000 kb/S video on a smartphone or tablet?
If so, how and what devices are compatible? I am able to do this with cheap logitech webcams, however the ...
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20 views
"True" monochromatic/greyscale video format
Sometimes referred to as "RAW" format, an example of which would be the now outdated CinemaDNG - a format that stores pixels in their pre-demosaiced form, as pure light intensity values as ...
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37 views
Moov atom not found on Raspberry Pi platform (Linux)
I have asked this question on innumerable sites but I haven’t been able to get an answer to solve my problem. The question
Need help to fix a broken MP4 which lacks a MOOV atom
Seems to be on point ...
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119 views
How to convert Fast Mpeg 4v2 (mp4v) with ffmpeg
I have problem with ffmpeg properly recognizing a video encoded with Microsoft Fast Mpeg 4v2 codec. Apparently it's a software codec. VLC plays the video fine. The codec reported by VLC is:
Codec: ...
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2answers
114 views
Importing uncompressed video into Final Cut Pro without (too much) transcoding
I have recently digitized a VHS tape using VirtualDub. Here is the MediaInfo of the original file.
General
Complete name : capture.avi
Format ...
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1answer
433 views
How can I put a VP9 video stream into a QuickTime/MOV container?
FFmpeg has no trouble putting all sorts of weird video codecs into QuickTime/MOV containers, including utvideo, hap, snow, ffv1, and cinepak. This makes sense, as it is my understanding that the MOV ...
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552 views
Streamable Container for gstreamer with ngnix / RTSP on jetson nano
Im working on this project :
https://www.hackster.io/jonmendenhall/jetson-nano-search-and-rescue-ai-uav-9ca547
At some point I will need to mount my camera (waveshare ; IMX219-77IR) on top of the ...
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1answer
12 views
GIF/SVG kind of compression for Video
I am looking for a solution to compress screen recording. Imagine a coding tutorial involving mostly text and windows and almost no graphics other than icons and occasional view of the wallpaper.
...
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1answer
12 views
HTML5 video lags, but only for certain sections
For this HTML5 video, it runs fine without any playback issues except during a certain clip around the 3:15 mark:
https://newtube.app/TonyHeller/X31Kd6s
I'm just a simple code monkey and don't know ...
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1answer
141 views
Can I use ffmpeg to encode a video for Camtasia import?
I'm using ffmpeg to create screencasts. The command looks like this:
ffmpeg -f x11grab -framerate 30 \
$(xwininfo | gawk 'match($0, /-geometry ([0-9]+x[0-9]+).([0-9]+).([0-9]+)/, a)\
{ ...
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1answer
446 views
ffmpeg: Unknown decoder 'copy' when concatenating clips
Basically I was following https://video.stackexchange.com/a/15701/26767, which states:
This should work faster...
ffmpeg -ss 1:00 -t 5 -i in.mkv -ss 2:00 -t 5 -i in.mkv \
-filter_complex "[0][1]...
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1answer
79 views
How can I find out the codec of a video I have exported from Premiere Pro?
I've exported some videos from Premiere Pro after working on them, but I've forgotten what the codec of the video is. How can I find out the codec of the video? Thanks!
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1answer
85 views
Hello ffmpeg heroes - please help me with ffmpeg/ffprobe commands to decode a video for me?
I have a sample.mp4 which is currently not playable on VLC or media player and I've checked the FFmpeg values and get the below result? Any help would be greatly appreciated.
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337 views
Widely compatible video format with lossless audio
I'm a software developer. My software produces animated video files with music.
The video files should be compatible with a wide range of software, and they should have excellent audio quality. The ...
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1answer
42 views
Decrease video size post-editing
I am using a video editing software to edit my videos for YouTube. The scenario is as below:
Input file size: 80mb.
Input type: webm.
My expectation after editing :
Video size: around 100mb.
(Any ...
0
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1answer
272 views
Create 4x2 grid mosaic
trying to create a 4x2 grid from 8 videos using the terminal on a mac. The code I am using is not working:
ffmpeg -i input0.mov -i input1.mov -i input2.mov -i input3.mov -i input4.mov -i input5.mov -i ...
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40 views
Why does audio not work for this mp4 when played on IPad with headphones plugged?
I'm hosting this video : https://itype.techforge.com.au/assets/videos/repeated/WordRat.mp4.
It seems to work fine unless you happen to be on an IPad and plug the headphones in. With the headphones ...
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1answer
181 views
Valid Slideshow-Video created by ffmpeg is not accepted by Twitter
I create a video from a slideshow using ffmpeg. I have a valid video at the end. VLC plays that video, YouTube also. I want to display the final product directly on twitter.
I checked the recommened ...
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1answer
43 views
Artifact in animation / horizontal lines & double images
I'm using Handbrake, with the H.264 Codec (RF:16). It works pretty well with live action, but it produces odd results whenever I try to back up/encode animations. I've attached a screenshot:
Anything ...
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2answers
153 views
Merge multiple video files using ffmpeg by adding multiple compress options
I would like to merge multiple video files, performing in the same time complex compressing options.
How can I do that? The following ffmpeg command resulting this error:
Filtergraph 'scale=1280:...
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80 views
How do I get Windows Media Player and other tools that depend on system codecs to play this video file?
I have a video file that plays fine in VLC, but only shows 100% black frames in Windows Media Player, and in other applications that depend on system codecs (for example in MATLAB, which is where I ...
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24 views
Save video with the exact quality of the source file
I have never had success in saving file with same quality after editing. Either it was much bigger, or quality was worse (square blocks etc).
I thought MediaInfo program would help, i used to check ...
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0answers
405 views
FFMPEG -C:V Copy and -C:V Transcode
When I do it like this,
-c:v copy -preset ultrafast -cfr 20 -tune zerolatency
and it doesn't work I know that this is excpected because the video codec is copied and all the other parameters such as ...
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1answer
969 views
FFmpeg convert G.711 Audio to AAC Audio
Is it possible at all to convert G.711 audio to AAC audio in a stream using ffmpeg? My cam is streaming fine in Chrome (video + audio) but all the other browsers have no audio. I would appreciate any ...
0
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1answer
77 views
Best render settings for youtube
I am using Vegas Pro as an editing tool for my videos. What codec (currently using x264vfw) and settings are best to render 1080p 60fps video for YouTube if I don't care about either rendering time or ...
1
vote
1answer
332 views
Network Stream reloading in a loop (Nginx/RTMP Streaming Server)
As the generic title suggests, I do not know exactly how to explain my problem, neither do I know what could cause it. Hopefully this ends up to be the right place looking for help, as I do not find ...
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1answer
28 views
Where to get codecs?
I have a two part codec question.
I want upload a 100 min video to YouTube. Export size from Premiere Pro is 22GB on disk. Here are the only Codecs I have installed:
I'm new to this, and was advised ...
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2answers
1k views
How to make video play with correct aspect ratio
I have the following issue: I have a video file (h264) that plays with the correct aspect ratio in mplayer. However, if I load it into Intel's Computer Vision Annotation Tool, or if I re-encode the ...
