Questions tagged [codec]

Shorthand for "Encoder/Decoder". A codec allows to convert data into a different representation and decode it again. Codecs are mostly used in signal transmission, e.g. for audio/video playback or streaming.

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81 views

AV1 extract keyframes

Using this file [1], I can run this command with no problem: ffmpeg -i crushed-between-two-portals.mp4 %d.jpg but if I run either of these commands [2]: ffmpeg -i crushed-between-two-portals.mp4 -vf &...
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What is a MOJO codec and how can it be used with ffmpeg

NComputing VCast has this MOJO format that can play fast on their thin clients. As described here: https://support.ncomputing.com/portal/en/kb/articles/vcast-what-is-the-difference-between-web-media-...
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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 ...
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Extract timestamp of I-frames of video using ffmpeg

If I understand correctly, I-frames are the frames that are unaltered during video compression. I want to extract the exact timestamps of these I-frames and save the output in a txt file. How do I do ...
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The encoder 'aac' is experimental but experimental codecs are not enabled, add '-strict -2'

How to use this in particular piece of codes.. how to enable aac and pass '-strict -2' or any other solution for merging video and audio at production server i am unaable to do this. video_stream = ...
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the .m3u8 video being downloaded converted to mp4 result in trouble

why did the .m3u8 video being downloaded converted outright to mp4 result in lower resolution quality? It's anyway either done by vlc or ffmpeg cli Please one expert solve it to be got the same good ...
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Troubleshooting Sony WH-1000XM3 Headphones

I'm having codec issues with my Sony WH-1000XM3 headphones and my Windows 10 computer. Is there any way to get some information about the codec used by the headphones, and perhaps additional ...
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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 ...
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FFMPEG - Transcoding webm to mp4 - wrong duration

I have a webm file that I want to convert to a mp4 file. The result is a mp4 file with a different duration than the webm (much longer). Webm file (via WeTransfer, example.webm, 421kb) About the ...
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Audio is scrambled up when using ffmpeg concat demuxer

I am using ffmpeg's concat demuxer to join different mp4 videos. First I have reencoded all videos with the following command: ffmpeg -i "${file}" -c:v libx264 -c:a aac "${out}" ...
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439 views

What are the differences between the HuffYUV and ffvhuff codecs in FFmpeg?

Doing ffmpeg -codecs | grep -i huffyuv shows that my FFmpeg build supports three different versions of the HuffYUV lossless video codec: DEVI.S ffvhuff Huffyuv FFmpeg variant DEVI.S ...
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Is FDK-AAC still better than FFmpeg's native AAC encoder?

I wrote this about a year ago while working through my own way trying to compile a FFmpeg for Windows, based on the premise in the FFmpeg wiki that: The Fraunhofer FDK AAC codec library. This is ...
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Headset microphone isn't recognized by Linux

My headphone is the Philips SHE1405BK/10, similar to this one. Neither Fedora and Debian could recognize it. It works fine with Windows 10 and my android phone. I'm using Fedora 33. Already tried to ...
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Join vides of different formats

I have a collection of videos that have been recorded and encoded with various different devices and codecs. I try to make one movie out of them. I thought it's a good idea to bring them all to the ...
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Realtek codec driver won't install - keeps “uninstalling”

So I downloaded the latest Realtek codec driver (Win10, 64-Bit) and after running the installer, it says that the current one must first be uninstalled for the new one to be installed. Ok. Let the ...
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How to set the MixMonitor extension that match the RTP codec used?

I have a dialplan where I am using the application MixMonitor. This application take a file path, and the extension is used to define the format of the file (wav, alaw, ulaw, g729, ...). For the ...
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600 views

ffmpeg loudnorm: normalize audio volume with two pass

https://trac.ffmpeg.org/wiki/AudioVolume#LoudnessNormalization However, it is recommended to run the normalization with two passes, extracting the measured values from the first run, then using the ...
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Why has bitrate changed after remuxing with ffmpeg?

I am running this command to remux a .VOB file into a .mov file, without re-encoding. ffmpeg -i input.VOB -c copy output.mov The details of the movies' codec, framerate and bitrate in QuickTime's ...
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Compressing video consisting mainly of text and still images (Powerpoint slides)

(NB This question is largely a duplicate of Best video codec for filmed powerpoint presentation but that question is 7 years old and I hope to see if there is new advice. I don't have enough ...
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How can I convert this mp4 file (maybe just the codec) to make it playable on both macOS and iOS?

This is the output from ffprobe $ ffprobe ch0_20200718113915_20200718114209.mp4 ffprobe version 4.2.2 Copyright (c) 2007-2019 the FFmpeg developers built with Apple clang version 11.0.3 (clang-1103....
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Windows Media Player not playing MP4 files, even after I try to install Klite codec pack and media.player.codec.pack

Windows Media Player not playing MP4 files, even after I try to install Klite codec pack and media.player.codec.pack I have looked at "windows media player cannot play the file" mp4 but ...
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How to transcode to hevc losslessly using ffmpeg hevc_qsv encoder?

I'm using ffmpeg -hwaccel qsv -c:v h264_qsv -i Intro.mkv -strict -2 -c:v hevc_qsv -preset veryslow -c:a copy Intro-hevc.mp4 to transcode a h264 mkv video to hevc mp4. Although the file size is ...
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drawtext =enable'between(t,0,5)' not working

I'm trying to draw text in a horizontal line and I want only Text1 for the first 5 seconds, and then Text2 starting from 5 seconds to 20 seconds, and Text3 starting from 10 seconds till the end. When ...
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1answer
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H.264 Codecs on Chromium Linux

I have been using Chromium for a while, but I found was that I can't watch Netflix because the H.264 codecs are not available. I have already done some research on this, but nothing works. I have ...
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FFMPEG conversion from MP3 to FLAC - why is the file so large?

So for various reasons I'm converting an MP3 to a FLAC with the following: ffmpeg -i x.mp3 -map 0 -map -0:v -compression_level 5 x.flac x.mp3 is 21MB and the resultant x.flac is 102MB I assume, ...
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273 views

Chrome video decoding GPU or CPU

If I watch a video on the internet in the chrome browser, and the video is encoded with H265 or VP9 (or the future AV1), and I have a Nvidia GPU (GTX 1080): Is the video decoding happening on the GPU ...
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Error Audio codec COD3 when installing Linux Mint 19.3 on Dell Inspiron 3593

When installing Linux Mint 19.3 on laptop DELL Inspiron 3593 4core I5 the installation stops and displays - error "Audio codec COD3" . People advised me to update by connecting to the Internet and ...
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422 views

NVIVO 12 - The Media File Format Not Recognized

I installed NVIVO 12 on a windows server 2019 machine and a Windows 7, and still get this error when I'm importing media files with .m4a, .mp3 (low and high quality), and .wav extensions. I wanted to ...
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5k views

H.264 video support in Chromium, missing codec?

Been using Chromium for a while, but it occurred to me that most video content does not work. YouTube does, but Vimeo does not, and most video streaming sites as well as random webpages with embedded ...
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VLC for Windows won't play MP4A audio on live stream

I'm attempting to play back a live H.264 feed in VLC for Windows (latest version). The feed comes from a HDMI to IPTV encoder. In OBS, the feed plays fine, and streams to youtube etc, audio and video ...
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1answer
993 views

Video-Codecs in Chromium missing

I use a Version 81.0.4032.0 (Entwickler-Build) (64-Bit) Chromium Browser on my Windows 10 computer. On Facebook Videos and some Gifs are not running. So I opened the Console and found this logs: ...
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How to use the correct WebP encoding for Wikimedia Commons?

I am trying to encode some cyclical graphic animations for Wikimedia Commons. The following article says, "The image format WebP that is based on VP8 is supported on commons. It supports both ...
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ffmpeg: Could not find codec parameters for stream 0 - Video: none (H265 / 0x35363248)

I am trying to find a way to concatenate videos I am getting from an NVR. To my understanding, the video is encoded with H265, but I am not able to find more information on the specific codec (...
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211 views

How can I create a video with certain codec?

I am currently testing a video player with DASH contents and I need to create a certain content with two video tracks: one with parameter @codecs = "avc1.4D4028" and the other one with value @codecs="...
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1k views

Compressing Grayscale 8-bit PNG Sequences with ffmpeg

I typically deal with many high-resolution PNG sequences, many of which are RGB (24-bit) or entirely grayscale (8-bit). Because adjacent frames in the sequences are very similar, it is important that ...
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How to play 3GP video files?

I've got an Android Umidigi smartphone that records 3GP video files. I'm trying to get these to play on a Windows 7 x64 machine. For these video files, GSpot displays the following information: ...
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250 views

5k player 4k movie H264 codec isn't using hardware acceleration on GTX970 GPU

The machine I am using: OS Windows 10, 6Gb Ram, NVidia 970GTX and AMD FX6300 CPU, the media player is the latest 5k player display is 4k TV and I am trying out 4k movies, but they lag really badly. I ...
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255 views

Do video containers affect video quality ? Or is it just the codec?

Do video or audio file containers (extensions) have any repercussion with the video in itself ? Or is the codec used the only thing that has a repercussion ? For example I have the exact same video ...
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437 views

Extracting AAC LC audio from mp4 using ffmpeg

Here is the info of the file that I am working with General Format : MPEG-4 Format profile : Base Media Codec ID ...
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1answer
1k views

Lossless Video Codec supporting Alpha Channels

Suppose I have a sequence of PNG image files which may or may not contain an alpha channel (assume those that do have an alpha channel actually utilize it). While PNG files themselves have their own ...
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615 views

VLC Playback Stutters with ProRes-encoded Video

I have a 4K 60fps 3.46 GB video file that was encoded from a lossless 8bpc RGB mov video file using the following ffmpeg settings: ffmpeg -i 8bpcRGB.mov -c:v prores_ks -profile:v 2 -bits_per_mb 540 -...
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380 views

Combining MJPEG AVI with PCM WAV and encoding using H264

We are trying to set up an experiment where the subject will listen to auditory stimuli while watching a movie. We generated the WAV audio files using a PCM codec (pcm_s16le). The AVI video was ...
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Extract Mime Type codecs for MediaSource using FFprobe

I have to extract the codecs e.g. 'video/mp4; codecs="avc1.42E01E, mp4a.40.2"' for the MediaSource API. How can I do this strictly with FFprobe/FFmpeg tools? Do not suggest other tools please.
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How to extract an elementary video stream from Avigilon .ave container?

I would like to figure out how to extract a H.264 video stream from an Avigilon .ave custom container. Unlike with here where they are using ffmpeg to extract the elementary video stream, when I try ...
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1k views

Differences in various ffmpeg h264 encoders

Can anybody explain to me the differences in these h264 ffmpeg encoders? Does any of them use GPU accelerated compression? V..... libx264 libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part ...
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151 views

Converting a mp4 into this webM codec with FFMpeg

There is a game that uses this weird codec and I wanna know how can I convert my own mp4 file into a webm with using the game's webM settings with FFMpeg or any kind of converter. Here are the ...
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217 views

how to use ffmpeg on ubuntu to encode to dnxhr 12 bit

i've been trying to make dnxhr 12 bit files using ffmpeg and it always seems to come out as 10 bit. when i've checked, it seems that my installed ffmpeg says it should be able to do this but ffprobe ...
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Add a short video to beginning of existing video WITHOUT REENCODING..?

is it possible to add an image or short video to the beginning of an existing video WITHOUT REENCODING? Disclaimer: I am aware that not all video formats support concatenation without reencoding. Let'...
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3k views

How to change Codec ID with ffmpeg

Now I have a mpeg4 file with Codec ID 'isom (isom/iso2/avc1/mp41)'. I need to remake its ID to 'mp42' (I have to save all other settings without changes). what commands I should use in FFmpeg to do ...
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3k views

How to smoothly play .m3u8 files in Windows Media Player

Windows Media Player technically plays .m3u8 files, but it stutters between each of the audio segments. As an example, try playing https://s3.amazonaws.com/cnn-assets/app-assets/cnn-lite/liteaudio....

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