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Questions tagged [codec]

A 'coder-decoder' computer program capable of encoding and/or decoding a digital data stream or signal.

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Do video containers influence the video quality?

https://en.wikipedia.org/wiki/Comparison_of_video_container_formats Understanding containers and codecs I'm just confused because the information above seems to indicate containers are simply chosen ...
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24 views

Best FFmpeg codec for Final Cut import

Is there an ideal FFmpeg codec to use when the video file is designated to be imported into Final Cut Pro X?
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65 views

Add timecode information to file

I'm writing a program that interprets LTC timestamps from audio channels in video files. The goal is to remove the LTC track and replace it with some kind of native timestamps directly in the video ...
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96 views

Convert to ProRes with ffmpeg adds unwanted contrast to footage

I'm trying to convert H.264 footage from a Panasonic EVA1 camera to Apple ProRes with ffmpeg. However no matter which setting I use, the output file has slightly more contrast than the original input ...
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54 views

MJPEG Compression

Does a video stream compressed with MJPEG have a less variable output bit rate than others. If I make a little list, start with YUYP420, MJPEG, MPEG2, MPEG4, MPEG4_Part10HEVC(h264), SNOW? Given the ...
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28 views

Is MP4 a valid or common container for ProRes?

Is MP4 a valid or common container for ProRes? I've only seen it in MOVs and MXFs.
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37 views

AviSynth can't open my AVI file: “AVISource: Couldn't locate a decompressor for fourcc dvds”

I simply want to open an AVI file with AviSynth and feed it into VirtualDub. However, when I open my .avs script (consisting of just one AviSource() call), I get the following error: Avisynth open ...
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17 views

Codec for video surveillance assuming non-changing scenes

Are there video codecs, which automatically and effectively compress static scenes? For example, if we have the same room shown at the same light, this codec should produce zero or very low extra ...
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102 views

format and codec for a video with 5760 x 1080

For an art installation I need to project on 3 projectors (1920 x 1080). My playback setup is: 1 PC with Windows 7, SSD, NVIDIA GeForce GTX 980 and 3 projectors (1920 x 1080). The video I need to ...
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48 views

What codec do I need for this video file?

I have a video file from my Hikvision NVR which I cannot play on Windows 10 in either VLC or Windows Media Player - all I get is a black video and the seek bar just whizzes along... I can play this ...
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2k views

Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly

I am using below command to push the video to Wowza server, since we are pushing raw h264 video, the rtp packet doesnot have the timestamp, and we could observe audio video sync issue while playing ...
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235 views

AAC with no global headers is currently not supported

As per ffmpeg bitstream filter documentation, if we use -bsf:a aac_adtstoasc then the AAC stream from a raw ADTS AAC or an MPEG-TS container to MP4A-LATM. https://ffmpeg.org/ffmpeg-bitstream-...
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22 views

codec/container with additional reconstruction information for archival?

Are there (open source) codecs that support additional recovery information to be added during encoding to allow for an improved recovery from corruption? Application would be data archival of videos ...
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77 views

One flac file - many tracks - no cue - yet it's 'split' somehow

I have a music album in one FLAC file. There is no CUE file. When I try to play it with VLC or CMUS, it doesn't recognize individual tracks and plays it as one large file. BUT if I import it into Vox ...
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97 views

Is 4K 4.2.0 just HD 4.4.4

I've been reading about codecs lately and found out, that the 4.2.0 codec combines 4 pixels color to one used for all 4 of them, effectively lowering the filesize. Now how does this compare to a ...
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188 views

FFMPEG frame extraction

I have couple of video files with sudden transition from black frame to blue frame, both frames have burned-in frame numbers, I would like to use ffmpeg to define the timestamp of this transition in ...
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Does gamma correction interfere with subpixel motion estimation?

AVC and HEVC work on gamma corrected, non linear, colors. When interpolating the value at subpixels, a multi tap algorithm processes the gamma corrected values of the original pixels directly, ...
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Codec optimised for changes in small part of the frame

Which modern codec(s) are best optimised for a video file that contains constant changes but only in a very small portion of the frame? I'm thinking like a desktop background with the mouse cursor ...
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27 views

Video Loop Black Screen

I have an AVI file , it runs good. However i have another application which uses this avi file in a loop , when it runs to the 2nd loop or 1st loop , it gives a black screen with an error : ...
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166 views

How can I force a codec tag?

I have a video taken from my iPhone named a.MOV, and here is its streams: $ ffprobe a.MOV 2>&1 | grep Stream Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), ...
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41 views

Best lossless codec [closed]

What is the best codec at the moment without losses? HEVC, or is it faster / more compact? In HEVC there is a lossless mode. On the Internet did not find the actual information for this year.
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131 views

FFMPEG - MAC OS Cannot Capture from Black Magic UltraStudio (Thunderbolt)

I have Black magic UltraStudio Express that captures SDI or HDMI and Connected to MacBook via Thunderbolt when I list devices I get the Audio but not the video : $ ffmpeg -f avfoundation -...
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322 views

Best settings in Media Encoder for fastest proxy transcoding?

What are the best settings/codecs in Media Encoder for the fastest proxy transcoding possible? I manually added a new encoding+ingest preset to transcode the footage to very low resolution proxies. ...
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188 views

Lossless color compression

I need to reduce the file size of an mp4 video. I don't need color information at all but pixel brightness resolution must be preserved. Videos consist of white background with a few (important) black ...
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328 views

Best free/low cost lossless video codec in ffmepg

I'm working on integrating video exporting in a game, using ffmpeg (the actual libs, not commandline-tools). Everything is more or less already implemented and works really well but not activated yet. ...
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encoding for slideshow with text and graphs

I want to encode the video recording of a slideshow. Slides are mostly graphs (line plots with labels) and text, few pictures. Framerate can be as low as possible to save filesize (is roughly 1 slide ...
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24 views

Lossless and lossy compression techniques

Are MPEG and H.264 Lossless?? I need a brief explanation about lossy and lossles... And which compression technique is generally using in CCTV Surveillance applications of video??
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23 views

Recompressing H.264 footage without lossing quality

I often use NVIDIA Shadowplay to record, and the footage is often always very inefficiently compressed, being about 40Mbps and 5 minutes long, when in reality I only need it to be 1 minute and I ...
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1answer
41 views

Understanding containers and codecs

To my understanding, there is the container format (MP4, MOV, 3GP, AVI) and the codecs (Theora, VP8, H264, XVid, DivX). For what I understand, the container format and the codecs are independent and ...
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1k views

How do I check codec for a video(mp4) in windows 10? [duplicate]

I'm devleoping an Android application. The official site lists all the codecs which are recommended for videos in Android platform. I have 2 videos. One of them cannot be played by Android. I would ...
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25 views

Why is converted MJPEG file not playing?

I have MPEG-4 movie format, i am converting it to Media Format MJPEG Video Codec MJPEG WidthxHeight 720x576 FrameRate/second 10 Bitrarte (kbits/sec) 1440 It has converted through Oxelon Media ...
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82 views

What does codec stand for?

Does codec stand for compression or decompression? I have also heard it stands for encoder/decoder. Which is it? Maybe something entirely different. I'm looking for a source better then Wikipedia.
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Which lossless RGBA codec should I use for share animations sequences between my different video software?

All is in the question. For the moment, I use PNG image sequences which is cool but sometimes I wonder if a better option exists. I heard about HuffYUV but I never tried it because it wasn't easy to ...
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35 views

Does increasing the framerate while not changing the content affects compression quality?

This question has no practical importance for a regular video production pipeline, but nonetheless it's something I find fascinating because it would imply video codecs use temporal sub-sampling ...
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563 views

Originally smooth unicolor background shows “steps” in the color gradient when exporting

I am using Abode Premiere Pro. I am working on a video which has a static background. The background is almost unicolor with a light color gradient. Please see here: I want to export the video. The ...
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154 views

AVI Capture in VirtualDub: MP3 Compression

I would like to capture my old VHS tapes to my HDD. I already was successful installing the xvid codec which gives me an acceptable video compression. But somehow I am not able to set audio ...
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189 views

Codecs with allow fast backwards stepping frame by frame with mpv

According to https://github.com/mpv-player/mpv/issues/4019 backward stepping for example with H264 codec is slow compared to forward stepping. Other codecs, for example mjpeg works a bit better. For ...
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393 views

Why can't my video play from where I drag the playback bar?

I am stuck and really do not know how to explain it in correct manner. Thus I put it in the layman details. I have two 30~ second length mp4 videos saved in cloud storage. video1 is generated by ...
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2k views

how to use h264_omx on RaspberryPi

I'm using RaspberryPi 1gen B+, for push stream to web through rtmp. But I find my CPU usage came up to 90%+. This is how I use it: ffmpeg -re -f concat -safe 0 -i playlist.txt -vcodec copy -acodec ...
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Export MXF XDCAM 422 from Adobe Premiere CS6

Can i export a video with the above specs from Premiere CS6? File type: MXF Format: MXF XDCAM 422 Resolution: HD 1920x1080i Frame rate: 25fps Bit rate: 50Mbps Aspect ratio: 16:9 full frame Audio ...
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584 views

encoding with ffmpeg libx265 -pix_fmt gray gives unplayable vid

What am I missing? I encode an old black and white film clip with ffmpeg libx265 passing -pix_fmt gray. The output is unplayable in both vlc and mplayer (linux), so I assume I'm missing something... ...
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Suggestions/Ideas for a “Show Me” project for school about Audio or Video Encoding?

Basically, I need to make a quick "Show Me Something Cool" project for my physics class. It could be about anything sciency, that is cool, and that you can explain & demonstrate in class in like 5 ...
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222 views

Quality of time lapse from images

I'm planning on creating a time lapse from a series of still images. I plan to shoot the images in raw (Nikon NEF, Adobe RGB), then edit with Photoshop and export as jpegs (highest quality). I am ...
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400 views

What are the best codecs and encoding options for a image sequence video?

I am trying to make a video out of an image sequence - Where each frame lasts for a second. The image sequence contains the same object shot from different distances. I'm guessing most default ...
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451 views

How to speed up DNxHR HQX capture with ffmpeg?

I'm trying to capture DNxHR HQX to my SSD. I want HQX because I need the 10-bit color for grading (HQX is a 12-bit codec, but HQ and below are all 8-bit). 8-bit HQ recording is no problem; I ...
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63 views

Please Explain the Codecs in my Example [closed]

Can someone explain what's happening in my project? Please use as much detail as possible, I just want to learn, thanks. I have an Apache web server. It contains many videos (.mp4 .mkv which are ?...
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147 views

Record straight to DNx with Open Broadcaster Studio

It would be very helpful for me to be able to record straight to DNx instead of MP4 packed h.264 with Open Broadcaster Studio. The option is there Output > Advanced > Recording When I select Custom ...
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72 views

FFMPEG: find video codec with small portion of file

Is there a known method to discovering the codec of a video with only a small portion of it? If so, is it consistently the beginning and/or the end of the file? From what I've read it (the header) ...
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261 views

Safe source for avc1 codec for windows

My Windows install does not have the avc1 codec installed (i have the ffmpeg and cole2k codec packs installed). Even though files encoded with this codec can be played using VLC on this machine, ...
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2k views

Problems opening 3GP files in Sony Vegas 12 64bit

My system crashed and i reinstalled windows, including Vegas. Projects that included 3GP files (GSpot says that the codec is MP4V), now cant link the 3GP files. Vegas says files are offline, i ...