Questions tagged [codec]

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

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16 views

Best codes for different video formats

Is there a list somewhere on internet to give a basic idea what codes are best for different video formats, for example what codes are best for MP4, MPEG, FLV etc?
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24 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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20 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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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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27 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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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
39 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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607 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
39 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
37 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
169 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
56 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
107 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
31 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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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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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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87 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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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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151 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
917 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
814 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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111 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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57 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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200 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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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
402 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
61 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
9k 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
504 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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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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278 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
370 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
238 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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71 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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295 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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2answers
344 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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53 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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64 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
154 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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1answer
57 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 ...
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1answer
250 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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352 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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846 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
4k 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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895 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... ...