Questions tagged [codec]
A 'coder-decoder' computer program capable of encoding and/or decoding a digital data stream or signal.
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Video not playing in mac
I use a OnePlus 6 mobile for recording videos and so far I have never transferred the video to my Macbook Pro, however, I recently copied all my videos to learn video editing.
All videos play ...
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8 views
RAW Format videos database
there is an online database for raw videos?
I wanted to download some videos in RAW Format for a university work and I can't find none.
The job I have to do is to encode the RAW video with different ...
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1answer
23 views
Smallest Possible Video File in H.264 Format
I am writing some unit-tests for a software that does some work with videos. To do so, I need a programmatically generated video file that is both small and legitimate in that it is actually a ...
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1answer
31 views
Best codes for different video formats
Is there a list somewhere on the internet to give a basic idea of what codecs are best for different video formats, for example, what codecs are best for MP4, MPEG, FLV etc?
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28 views
Video Quality Measurement test tool
I need to measure streaming video from various different codecs and be able to tell which one is better.
What will be the best metrics to look for?
Is there a free tool that can help with this.
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1answer
27 views
Can you encode intra-frame videos from inter-frame without loss?
I'm aware of the differences between intra and inter, but I'm not the most savvy about reencoding them after the fact. Is encoding with intra from an inter-coded video the same as if you originally ...
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1answer
15 views
Intermediate Codec for Resolve to Adobe Mediaencoder or Premiere Pro
I am editing in Resolve, sometimes I am also just Color Grading in Resolve, so I need an intermediate Codec between Resolve and Adobe Media Encoder or Premiere Pro.
The size doesn't matter as much, as ...
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1answer
28 views
Some MP4s have keyframes on scene changes. Others seem to have random keyframes, or keyframes every X seconds. What causes this discrepancy?
Some MP4s have keyframes on scene changes; others have keyframes seemingly randomly placed, or placed every 5-10 seconds. I prefer the former, both for ease of editing and because, unless I'm ...
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2answers
55 views
Is using codecs matter if Facebook re-encode all the uploaded videos?
I usually encode with libx265 and libfdk_aac to get good quality and small file size for posting in Facebook. I use ffmpeg as follows.
ffmpeg -i input.mp4 -vf -c:v libx265 -c:a libfdk_aac output.mp4
...
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11 views
Is there a codec good for timelapse? Most of the time an egg is hatching, it is sitting there
I'd like to take a video of an egg hatching, but the space on the camera fills up before the action happens.
Luckily, an egg before hatching is boooooring: 99% of the video is a still egg, sitting ...
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1answer
46 views
How to manipulate video codec errors using ffmpeg
I want to create a video full of codec errors like this:
How can I manipulate ffmpeg parameters to create an output video like that?
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2k views
moov atom not found
I downloaded this video using youtube-dl's HLS downloader. The video was being HLS streamed using AES-128. Even though I could view it perfectly fine when it was being streamed in the browser, VLC ...
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1answer
46 views
Convert a non-supported/obscure codec to a supported codec
I currently work with a team of researchers and we are obtaining data from videos that are encoded with SMB8, they are AVI files. We couldn't find anything on the SMB8 codec online unfortunately. We ...
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1answer
59 views
Which Blackmagic codec to choose?
I purchased recently a new BMPCC 4K and I'm facing a big problem with file sizes...
The files are tremendously huge, so I have to make a choice about the codec to choose.
I'm shooting basically ...
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2answers
238 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 ...
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3answers
60 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 ...
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1answer
142 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 ...
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1answer
40 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 ...
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13 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 ...
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0answers
87 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
25 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
118 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
47 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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179 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
1k 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
934 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
128 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
73 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
245 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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20 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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2answers
479 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
69 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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3answers
10k 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 H.264 video, the RTP packet does not have the timestamp, and we could observe audio video sync issue while playing ...
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1answer
539 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
318 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
394 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
251 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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1answer
73 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
326 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 -...
2
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2answers
367 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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1answer
91 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
69 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
3k 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
175 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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70 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
63 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
2k 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
263 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
388 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 ...
