Questions tagged [codec]
A 'coder-decoder' computer program capable of encoding and/or decoding a digital data stream or signal.
0
votes
1answer
15 views
What does Ma10p stand for?
i.e. a file is listed as being "1920x1080 HEVC Ma10p FLAC"
So....resolution / h.265 video codec / ? / .flac audio codec
On its own I'd guess the 10 stands for 10 bit depth, but the Ma is unknown to ...
1
vote
3answers
49 views
Some H.264 videos that I have seem to have excessive bitrate, is there a way to determine/find their recommended bitrate?
So I have some videos that are Full HD, h264 but they have over 30M bitrate at 30 FPS, they are SDR and their quality is not very impressive so it seems excessive and unnatural for such unimpressive ...
0
votes
1answer
31 views
What happens when you use a specific CRF value on a already encoded x264 video?
If there is a h.264 video, and I use -crf 17 I sometimes I get a lower bitrate, but the weird thing is - most of the time get a higher ones.
I am trying to get this setting because I think some ...
-1
votes
1answer
17 views
Maximum YouTube video stream audio bitrate
I know that YouTube no allows 96kHz audio. But I also worry about second thing the bitrate. How much is possible maximum to get from YouTube stream? I'v only found recommended value of 384kbps, but I ...
0
votes
0answers
8 views
hard edges when exporting gradient with alpha channel
I'm exporting a file with a radial gradient where the core is opaque and the outer perimeter is transparent, along with a transparent background. I've noticed that there is a hard edge around the ...
0
votes
0answers
43 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 ...
0
votes
1answer
24 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, ...
0
votes
1answer
32 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 ...
1
vote
1answer
41 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 ...
1
vote
0answers
80 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?
1
vote
1answer
530 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 ...
1
vote
1answer
486 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 ...
-1
votes
1answer
90 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 ...
2
votes
1answer
36 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.
0
votes
1answer
106 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 ...
0
votes
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 ...
1
vote
1answer
262 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 ...
0
votes
1answer
53 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 ...
3
votes
2answers
6k 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 ...
0
votes
1answer
384 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-...
1
vote
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 ...
0
votes
1answer
196 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 ...
0
votes
1answer
279 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 ...
1
vote
1answer
211 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 ...
-2
votes
1answer
61 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.
0
votes
1answer
240 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 -...
3
votes
2answers
273 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 ...
-3
votes
1answer
38 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??
4
votes
1answer
54 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 ...
-1
votes
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 ...
2
votes
1answer
123 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.
1
vote
0answers
53 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 ...
1
vote
1answer
47 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 ...
0
votes
1answer
1k 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
votes
1answer
207 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 ...
1
vote
2answers
262 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 ...
1
vote
1answer
585 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 ...
1
vote
1answer
3k 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 ...
1
vote
1answer
748 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...
...
1
vote
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 ...
0
votes
1answer
278 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 ...
1
vote
2answers
662 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 ...
1
vote
0answers
568 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 ...
-3
votes
1answer
146 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 ?...
1
vote
1answer
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 ...
1
vote
1answer
3k views
ffmpeg convert mp4 to mov with dnxhd codec
I'd like to convert an mp4 file to DNxHD for use with DaVinci Resolve.
Here is my attempt of doing the conversion using ffmpeg:
C:\FFMPEG\bin\ffmpeg.exe -i "H:\Downloads\test.mp4" -vcodec dnxhd "...
3
votes
1answer
443 views
.mkv file not playing in HEVC/H.265 supported player
I wanted to play UHD (4k) videos in my new LeTV (Super3 X55).
So I used youtube-dl to download 4k YouTube videos (which are humongous btw) but for some reason most of them do not play.
The TV's ...
0
votes
1answer
2k views
ffmpeg: Convert 4K 10-bit file to DNxHR 444
I have a 2160p29.97 AVI 10-bit RGB file recorded with a Blackmagic Intensity Pro 4K capture card. I want to convert this file to DNxHR 444.
I used the following command to do so on Windows 10 with ...
5
votes
1answer
5k views
ffmpeg: how to convert to DNxHR in Windows 10?
I have installed ffmpeg version 3.2.2 from the ffmpeg.org download page.
When I enter ffmpeg formats, I see dnxhd but not dnxhr. What do I need to do to be able to manipulate dnxhr?
I have ...
1
vote
2answers
4k views
ProRes444 Codec download process to Adobe Media Encoder
I am using MacOS Sierra and am trying to download the ProRes444 Codec in order to export my Adobe After Effects 4k RED footage in this format (probably using Adobe Media Encoder based on what I have ...
