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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HEVEC/H.265 GPU decoding

Is possible to decode files with H.265 video format using GPU? Specs: Intel i5-2400 NVIDIA 970 Windows 10 Pro Tried playing test samples (MKV with H.265 codec, 10bit), ~100% CPU usage, lags... ...
Inom Turdikulov's user avatar
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What happens if a presentation layer receives Unicode but can't present it?

I am currently a University student studying computer science and while studying for our networking test I was posed with an interesting question in our book. Lets say a computer was created before ...
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Convert Series of PNG's into MP4 Video Using FFMPEG Where Each Photo is 1 Frame and Each Frame is Played for 1 Sec

I have a series of 15 PNG Files - https://www.sendspace.com/file/jrpbl1. I would like to create an MP4 Video of them using FFMPEG. In my video I'd like to have 15 Frames (One per image) where each is ...
Royi's user avatar
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Convert MOV Video File Encoded as `qtrle` in Windows Using FFMPEG

I downloaded the latest FFMPEG for Windows (Version 3.2.4). I wanted to use it for converting a MOV File which contains qtrle uncompressed video. The video can be downloaded on this link - https://...
Royi's user avatar
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Can I optimize a 4K file so it will direct play on my 4K tv?

I have a handful of 4K files I'd like to play locally over my network, (everything hardwired with cat6), to my 4K TV. Can Plex pre-transcode the files so I can view them stutter-free? My server ...
Jason's user avatar
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Freeswitch: Can't do video call/conference using H26x

I using FS 1.6 . I've compiled it source codes. There is no problem when doing a video call using VP8 codec, but when I restrict the clients to use H263 or H264 codecs, no video is shown. After ...
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VirtualDub & FFDShow - couldn't load up XviD AVI

I installed VirtualDub recently (32bit) on 64bit Windows 10 machine. I decided to use 32bit version in term of using DeLogo filter, which is 32bit. I have already installed VLC Media Player in order ...
Polda18's user avatar
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FFMPEG - Copy a stream with change stream ID

I have video files with [.saf] extension. This file is using for "Seachagne" video server. And can play with MATROX hardware. Problem is, I have to make audio normalization all of these files. With ...
Andrei Kim's user avatar
3 votes
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3k views

ffmpeg show audio codecs supported by container format and video codec

To automate scripts for manipulating video files, I would like to get a list of supported audio codecs - ideally with their encoder names - based on a video codec and container format (might also be ...
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Videos stuck at first frame

I got a new laptop a few weeks ago (Dell XPS 15). Soon after I installed the basic software I needed (Browser, Antivirus, E-Mail software, ...) , videos started to get stuck at the first frame. Audio ...
Bobface's user avatar
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ffmpeg Audio Conversion m4a to wav - file size bloat

While converting audio files from *.m4a to *.wav using ffmpeg (and other audio converters - I've tried a few and cannot remember but they were worse) the file size increases by a lot (10x). original ...
Pyker's user avatar
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Use FFMPEG To Convert .MKV to .MP4 With Conversion Settings

I am using a powershell script and ffmpeg to convert mkv files to mp4 files so that I can stream them using serviio The script executes as it should, however when serviio tries to add the converted ...
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how to remove "Writing library" & "Encoding settings" from the video when used ffmpeg convert?

when I used this commond: C:\Windows\bin\ffmpeg.exe -y -i f:\1.flv -vcodec h264 -s 1280x720 -acodec copy f:\output.mp4 The video output.mp4 information: General Complete name : F:...
Rex's user avatar
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Pipe audio from VLC to stdout?

I want VLC to play some video (from VLC), but have the audio be outputted to stdout or a file. Here's what I've been trying to do, but it obviously doesn't work. It's a FLV file btw: DISPLAY=:0 vlc -...
Chris Smith's user avatar
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5 answers
41k views

Trouble playing 1080p HEVC format on VLC, MPC, Potplayer

I am having trouble playing HEVC 1080p file on my system. I don't have a really strong PC, but I will give the facts: Ram: 2GB OS: Win 7 ultimate processor: Pentium(R) Dual-Core T4500 @2.3Ghz Graphic ...
4-K's user avatar
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How do I use FFmpeg to convert .264 CCTV footage files to mp4 with h.264 codec?

I get the following error when I try to convert my test.264 file to mp4 using FFmpeg: Log C:\ffmpeg\bin>ffplay -f h264 test.264 ffplay version N-29947-gcd244fa Copyright <c> 2003-2016 the ...
Ishan jain's user avatar
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Recovery of corrupt .mov file from dash cam

Yesterday on the way to work I was run into by a truck. I felt relaxed that I had my dash cam running only to find out last night when I tried to retrieve the commute file that it could not be opened. ...
Christian's user avatar
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Convert m4a to aac without quality loss?

I wanna use a program on an .m4a file, but the program can't handle .m4a. It can handle .aac, however, and the codec of the file is MPEG-4 AAC. Is there a way to convert to .aac (and preferably ...
H.v.M.'s user avatar
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FFmpeg concatenate - Error while opening encoder

I have an Android application that uses ffmpeg to concatenates 2 mp4 video files (360x640) together and outputs it as one .mp4. This is my command: ffmpeg -y -i vid_1.mp4 -i vid_2.mp4 -strict ...
SebSob's user avatar
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1 answer
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Data loss due to transcoding video[ffmpeg]

I have a app which takes in user's video and does some processing. the processing pipeline consists of multiple steps. The code which i have written so far assumes h264 codec for input video. But user'...
gaurav's user avatar
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Overlaying in FFmpeg failed due to audio codec – how to fix it?

I am using FFmpeg to overlay a series of images on video but on some occasions on some MP4 videos it fails (but sometimes it works perfectly).  My command gives an error like: Could not write header ...
user3269550's user avatar
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ffmpeg: select (-map) audio track by codec id

How can I use ffmpeg -map switch to select the audio track by its codec? Say there is a video.mkv with one video stream (0) and three audio tracks (1, 2, 3). The audio tracks have different codecs, ...
Azevedo's user avatar
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Am I even burdened with choosing where and how to decode my video?

Whenever I setup K-Lite codec pack, like during an MPC install, this step of K-Lite always trips me up: It is never clear to me what is going on. No matter what I choose I will first have to decide ...
zoplonix's user avatar
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Unable to play mp3 file on some devices?

I have noticed a certain phenomenon over the last few years... Some mp3 files do not work with certain devices: Example: If I download a file file from the internet, I will be able to listen to it ...
undo's user avatar
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1 answer
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Decoding x265 HEVC more efficiently

I have an old Extreme i7 first generation with 12 threads running a PLEX server. LAtely I've started adding more files compiled using x265 over x264. I noticed that when the system runs a x265 file, ...
Jason's user avatar
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1 vote
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Common video format for TV (old decoder) playback

I have a PHILIPS TV/Monitor. I want to watch movies from USB flash drive directly on the TV. The problem is - PHILIPS do not have any updates for the TV software. I requested an update, but request ...
Ifch0o1's user avatar
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asterisk 11.7 with app_mp4 for playing mp4 videos

I have successfully compiled and run app_mp4 for asterisk 11.7 and recording audio/video with MP4Save. I am using ulaw as audio codec and h263 (simple h263 not 1998 or 2000) video codec. Although I ...
Jamil Farooq's user avatar
3 votes
1 answer
1k views

Raw Bitstream vs Container?

I've been researching multimedia formats (although recently, I've been told not to use the word "format" as it's ambiguous.) I learned that a video file is composed of the Raw Bitstream ...
b0yfriend's user avatar
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3 votes
1 answer
511 views

Need help searching video files by encoding format profile

I am looking for a way to search all my video files (directory/recursive) that have a "Format profile" of QuickTime and/or "Codec ID" of qt. I just found out that my encoding software has ...
Kilauone's user avatar
1 vote
0 answers
335 views

(FFMpeg) Split the video by size after conversion

I have a 5,000MB long video in .mp4 format. I would like to split the video into segments by the size. For example, I set the size to 1,024,000KB, or simply 1,024MB, because I want it to be accurate. ...
Happy Face's user avatar
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1 answer
601 views

Video compression size s and codecs from JPEG

I am building a data logger with 3 cameras which output as jpeg frames (o.79MB/jpeg @24bit/pixel) at 24 frames per second. I want to take these images and convert it to a video. Each For the video I ...
Vinny's user avatar
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2 votes
0 answers
389 views

Strange video behaviour

I have a video made by my mobile phone (Huawei Honor - Android 2.3). I haven't problems with them some time ago. Unfortunately, I have now and I don't know why. I'm using Linux Mint 17. When trying ...
fales's user avatar
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2 votes
0 answers
2k views

No sound in mplayer - A_OPUS codec

mplayer2 fails to play the sound of some .mkv files. I installed vlc and it is able to play with sound. mplayer2 output: MPlayer2 2.0-728-g2c378c7-4+b1 (C) 2000-2012 MPlayer Team Playing Invisible ...
Alex's user avatar
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1 vote
2 answers
5k views

Problems installing ffmpeg with Homebrew

I get the error when I try to convert mp4 to webm: Encoder (codec vp8) not found for output stream #0:0 Google search tells me that I need libvpx installed, but I've done that. I've installed with ...
Logan's user avatar
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4 votes
1 answer
2k views

Troupble with ffmpeg MP4 to Webm

I get the error when I try to conver mp4 to webm: Encoder (codec vp8) not found for output stream #0:0 Google search tells me that I need libvpx installed, but I've done that. here is the rest of ...
Logan's user avatar
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0 answers
223 views

Convert videos to MP4 iPad (h264 and aac), but leave video codec alone if h264 already

I want to batch convert video files with different extensions and convert them to MP4. If the video codec is already H.264, I want to copy it and convert the audio only if it is AC3, MP3, or anything ...
Sun's user avatar
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2 votes
0 answers
2k views

Cannot play video file from external hard drive on Windows 10

I have upgraded my OS from 8.1 to 10 and I have this weird problem that if I open a video file from my external hard drive it doesn't play but when I copy the same file to my desktop it works fine. I ...
Yar's user avatar
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Corrupt MP4 file: ffmpeg codec, global header, and dvvideo errors. Can it be repaired?

So, I have a number of corrupt MP4 files (some corrupt AVI files, too, but I believe that's a different problem). They seem to have gone corrupt when I had an external hard drive that they were on ...
John's user avatar
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8 votes
1 answer
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Is it possible to use aptX on unsupported computers or phones?

I've been reading up recently on different ways of wirelessly streaming media. At first I ignored bluetooth connections because of the quality, but then I started reading about aptX, which sounded ...
trainman261's user avatar
-1 votes
1 answer
960 views

Php ffmpeg exec

with code $a = exec('"ffmpeg" -y -i "test.mp4" -ab 128k -s 640x480 -vcodec mpeg4 -acodec:a copy "output.mp4" 2>&1 ', $output, $error); Input file was 82.21mb output file was 13.74mb Output ...
shilpa's user avatar
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1 answer
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What does Asterisk need codecs for?

Let's take a system which consists of one Asterisk server and two SIP clients. Each client has an equal set of codecs installed. Traffic encoding and decoding is performed on a client side. Then why ...
Paul's user avatar
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1 answer
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Are video encoders installed per-application or system-wide on Windows?

I normally use Linux where, if I want programs to be able to encode video, once libXXXX.so is installed all programs which are aware of it can use it. By comparison, I have witnessed various programs ...
spraff's user avatar
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What all factors affect the ability of a video player to play a particular file?

I am trying to determine what all factors decide whether a file can be played by a particular video player, such as software or dvd player or TV with usb function or any media player. Are there other ...
gyaani_guy's user avatar
1 vote
1 answer
7k views

Playing opus files under ubuntu

Opus is a new audio codec standard for audio on the web. Features include: Better compression than mp3/ogg/aac. Good for both music and spoken word. Dynamically adjustable bitrate, audio bandwidth, ...
xpt's user avatar
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2 votes
2 answers
981 views

How to get and install g723 codecs for sip applications?

I install an ubuntu desktop in my company network (windows network) that use SIP on software phone and hard SIP phones. I use Jitsi that is a good client for SIP and works well with others software ...
Rémi Becheras's user avatar
6 votes
1 answer
15k views

FFmpeg - PNG / JPG - Invalid data found when processing input

I am trying to add a watermark to a video with FFmpeg. I have a custom build of FFmpeg that I am creating with a view to keep the binary size down. I seem to have excluded the ability for FFmpeg to ...
Jon G's user avatar
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3 votes
1 answer
8k views

How to hide the opaque gray information on MPC HC in the upper left of the video

I just updated K-Lite Codec Pack. The updated version of MPC HC is showing this gray opaque OSD box: Anyone knows how to disable that? I can't seem to find the option to remove it. It's getting ...
MDuh's user avatar
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1 answer
510 views

How can I encode an image sequence to a 24bit RGB888 AVI file on OSX?

I would like to convert an image sequence(PNG or JPG) to an RGB888 avi file on OSX. I used VirtualDub on Windows, but I'd rather not go back and forth between operating systems if I can. I did try ...
George Profenza's user avatar
1 vote
1 answer
7k views

How do I know if hardware acceleration of the GPU is enabled in VLC?

Under the new VLC interface (Linux) with video-Catalyst driver installed what option I can chose to enable GPU hardware acceleration? How can I be sure it is enabled? $ vainfo give me this output : ...
smed79's user avatar
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1 vote
1 answer
5k views

Unable to re-encode audio stream with different bitrate using ffmpeg

A similar question has been asked elsewhere without a satisfying answer for me. The following ffmpeg command results in error. When "-c:a copy" is added to just copy the audio stream, the video ...
Visionscaper's user avatar

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