Questions tagged [codec]
A 'coder-decoder' computer program capable of encoding and/or decoding a digital data stream or signal.
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23 views
Upscale the key frames while decoding!
I would like to apply some kind of super-resolution (SR) to the keyframes in an H.264 video. The SR process should target the keyframes and upscale them by a factor of 2.
For the past few days, I've ...
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1answer
22 views
Surround sound for cinema feature film (Pricing of Dolby Surround)
We are planning to shoot our first feature film with a budget of around 100'000-2'000'000$. And we'd like to master it in 5.1 Surround sound.
Normal procedure would be to do it with Dolby Surround, ...
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1answer
18 views
“Opus cuts audio above 20kHz” - Is this normal for lossey audio codecs?
Summary:
1. Is it normal among lossey codecs?
2. what are the effects of this specifically when handling this 'cutoff' audio file?
3. Why is it still saving the file as 48khz if it doesn't contain ...
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1answer
37 views
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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0answers
48 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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1answer
292 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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1answer
246 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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1answer
67 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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1answer
33 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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1answer
65 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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0answers
18 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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1answer
164 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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1answer
49 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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2answers
4k 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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1answer
310 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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1answer
25 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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1answer
135 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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1answer
198 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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1answer
201 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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0answers
14 views
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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0answers
15 views
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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0answers
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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203 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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1answer
54 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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1answer
192 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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0answers
419 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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2answers
236 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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0answers
392 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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0answers
21 views
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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1answer
27 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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1answer
46 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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1answer
2k 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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1answer
98 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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0answers
51 views
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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1answer
40 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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1answer
844 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 ...
2
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1answer
178 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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2answers
221 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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1answer
496 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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1answer
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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0answers
2k views
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 ...
1
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1answer
672 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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1answer
27 views
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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1answer
249 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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2answers
521 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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0answers
527 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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1answer
132 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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0answers
187 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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0answers
74 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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0answers
279 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, ...
