Questions tagged [h.264]

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Why does a h264 encoded video recorded with HTML MediaRecorder on an Intel macbook not play on an m1 macbook with hardware acceleration enabled? [closed]

I've reproduced this issue in a simple sandbox: https://codesandbox.io/s/practical-driscoll-veyc2 (you'll have to open https://veyc2.csb.app/ in a new tab to have the screen recording functionality to ...
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32 views

How to decode a 2D video with H264 by FFPMEG?

For one of my projects (https://www.cs.tau.ac.il/~amir1/PS/3d.pdf) I need to use FFMPEG, but I am entirely new to C++ so diving into it will take a lot of time. Is there any code/handy resource ...
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14 views

how to find if a rtsp stream is h264 or not?

I am using GStreamer to save videos coming from RTSP. I use the RTSP URL provided by the CCTV manufacturer to get the stream. The DVR says it supports h264. I am able to save the video file. I use ...
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28 views

Why is the quality different on two videos with exactly the same codec / bitrate

I do a lot of video converting with programs like Format Factory and Any MP4 Converter. I downloaded season 2 of The Black Sails. It's roughly 10 hours total video at only 1.95gb with SURPRISINGLY ...
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43 views

VLC doesn't play mp4v video converted with VLC to h264/h265

VLC reports the original video as: Codec: MPEG-4 Video (mp4v) Video resolution: 8192x8192 Frame rate: 7.549296 I am using the Convert / Save option to convert the video using the following profile: ...
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11 views

Does Android ignore custom thumbnail of a video?

I added a custom thumbnail with FFMpeg following a SO answer: ffmpeg -y -i without_thumbnail.mp4 -i cover.jpg -map 1 -map 0 -c copy -disposition:0 attached_pic ...
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68 views

H264 Concatenation Works with FFmpeg but not Other Muxers

I have an original H.264/AVC video created by my phone: $ ffprobe -hide_banner -i vid1.mp4 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid1.mp4': Metadata: major_brand : mp42 minor_version ...
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1answer
28 views

h264 Settings for Motion Tracking & Analysis (technical photography)?

I'm trying to do "scientific" video motion analysis. Right now I'm using a Raspberry Pi camera, which records natively in h264, which then needs to be converted/wrapped as MP4. Is h264 an ...
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1answer
448 views

ffmpeg vf scale shifts colors to washed out

Im trying to scale video down. No matter what I do the colors are always washed up as a result. original: After scaling: Code I run for it ffmpeg -i input.mkv -vf scale=1028:-1 output.mkv log: log ...
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1answer
306 views

How to manage colour in After Effects to get precisely a desired colour in h264 output

I am working on a video for the web only. It is going to be on a webpage (never on broadcast), delivered as an h264 file. The web page background is hex code FFF1E5 (RGB 255, 241, 229). My background ...
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1answer
318 views

Resuming a partially-completed encode with FFmpeg

Summary Given a partially completed encode that: Was encoded using h264 in the Matroska container Was cut short by manually stopping FFmpeg by typing 'q' in the console ...what are the ways to ...
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24 views

Video coding : H264 is transcoded to H265. Result looks sharper despite lower bit rate. What is most likely explanation?

Video coding : H264 is transcoded to H265 using "slow" preset. When playing the video files (using VLC), the result looks sharper despite lower bit rate (10 Mb/s --> ca 1.5 Mb/s) and ...
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1answer
168 views

ffmpeg - Slow down video and loop/repeat audio

I am trying to use ffmpeg to slow down a video speed by 25% (75% speed) without changing the audio speed. ffmpeg -i input_video.mkv -filter:v "setpts=1.3*PTS" "SlowVideo25.mp4" On ...
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1answer
1k views

Video artifact removal and restoration - How can it be done? (Really?)

I have been researching this for the past couple of days, and all I could find on the subject were a bunch of research papers, a demonstration video of a model that isn't publicly available, and a ...
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270 views

FFMPEG: Convert WebM VP8/VP9 multi-resolution video to MP4 (H.264)

I have been trying to convert a multi-resolution WebM video ( VP9/VP8/H.264 ) (1280 x 1080 till the half, thereafter 1080 x 1280) to MP4 container with H.264 encoding for video. When transcoded with ...
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1answer
29 views

Do modern devices support decoding 4:4:4 pixel formats?

I am recording and distributing relatively low motion screen content (not games). Using h264, fine text often appears very blurry due to the poor subsampling with 4:2:0 and 4:2:2 pixel formats. With 4:...
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1answer
280 views

Can ffmpeg calculate a new starting keyframe when being asked to split/copy on a non-keyframe?

I understand from a question here that keyframes can (and do) occur anywhere in an h.264 stream, so I'm wondering why most of the advice I see where users want to cut on a specific time or frame (that ...
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1answer
755 views

How to convert 10-bit H.265 videos to H.264 without losing quality

I have a MPEG-H Part2/HVEC (H.265) .mkv file (Planar 4:2:0 YUV 10-bit LE). Since my LG PF 1500 beamer does not read H.265 but H.264 I would like to convert it (HVEC -> H.264). I think handbrake is a ...
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50 views

How do I get Windows Media Player and other tools that depend on system codecs to play this video file?

I have a video file that plays fine in VLC, but only shows 100% black frames in Windows Media Player, and in other applications that depend on system codecs (for example in MATLAB, which is where I ...
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30 views

Reducing pixel dimensions and frame rate does not reduce video size (Adobe Media Encoder)

I have created a video using After Effects which is about three minutes long and has a size of 86MB after exporting as h264. This seems quite an appropriate size for a good quality video to me. ...
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1answer
47 views

Edit small portion of a compressed video without losing quality

I have a one hour h264-encoded video. The unedited footage can't be found. My goal is to edit a small portion of it. The scenario looks like this. I have to blur out some persons appearing let's say: ...
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1answer
65 views

ffmpeg with h264 produces smaller file sizes for veryfast preset

I am experimenting with ffmpeg and x264 codec. And I have found some unexpected behaviour. I am encoding video with parameters CRF 23, high profile and changing preset. Documentation says: for ...
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2answers
3k views

Producing small H.264 files with Adobe Media Encoder vs ffmpeg/libx264

I am a terrible ignoramus in the subject, but the coronavirus has thrown me in the business of producing videos with my lectures. I care a bit for video quality and a bit more for small size. My ...
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2answers
3k views

Is there a way to improve h264_nvenc output quality?

I'm compressing some videos for archiving, and I came to this configuration which gives me a nice overall quality on a small size: ffmpeg -threads 4 -y -hide_banner -i input.mp4 -vf scale=-2:480 -c:v ...
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1answer
2k views

Intra-frame H.264 / H.265 compared to DNxHR or Prores as intermediate codecs for editing

IMPORTANT: ISSUE SOLVED (STILL A COUPLE OF QUESTIONS, THOUGH), I POSTED SOME INFO BELOW THE ORIGINAL POST AS AN UPDATE IF SOMEONE FINDS THIS USEFUL: Quick question: what are the advantages of using ...
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652 views

FFmpeg: DNxHR 444 10 bits transcoding issue (HDR project). SMPTE2084 unsupported?

I have a couple of questions regarding intra-frame codecs for editing purposes (in Premiere Pro). UPDATE (01/24/20). More details of the original issue after this: I seem to have encountered a dead ...
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81 views

Hardware Acceleration Compression (ffmpeg H264 .mov files)

I'm looking for a (preferably hardware) solution for quickly compressing ffmpeg H264 .mov files. The setup I have has several Edgertronic cameras that are controlled through an API (start, stop, ...
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1answer
673 views

FFmpeg raspberry pi OMX hardware encoder with inline_headers enabled = Increasing latency over the time

I managed to enable inline header on the OMX H.264 hardware encoder. inline header(SPS/PPS) are mandatory to play an already launched stream. https://github.com/Serveurperso/FFmpeg/commit/...
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24 views

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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1answer
222 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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0answers
145 views

How to calculate video file size for H.264

I need to estimate disk usage for a media project. In order to do that I need to calculate typical file sizes for different video duration and resolution. Example: Given a video with the properties ...
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104 views

No Maximum Bitrate H264 codec

I am trying to export a video with a low bitrate. Regardless of what I set as the target bitrate, the video always is exported with the highest possible bitrate. This occurs whether I use VBR or CBR. ...
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268 views

ffmpeg ProRes to MP4 Alters Colors Slightly

I cannot for the life of me figure out what is going wrong, but I have a ProRes MOV file with the following specifications: And I want to convert it to a 4:2:0 MP4 video file. Every time I attempt ...
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1answer
144 views

h264 compression keeps same number of frames?

I'm trying to understand how h.264 compression works. So far I have clear what I, P, and B frames are and how are they used. But I'm unsure of is if after this process the number of original input ...
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149 views

Efficiently compressing a looping video with h264

I have a video that is initially 19 frames long and lasts for about 0.5 seconds, it's 432kB. I've looped it over three minutes and the resulting file is quite large (200MB). Using FFMPEG is there a ...
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1answer
5k views

h264 (Constrained Baseline)/(h264 (native) vs h264 (libx264)

I am recording a video using OBS Studio with the following settings: With these settings, OBS is consuming 55 to 60 MB storage for a minute long recording. Considering that my recordings span across ...
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1answer
977 views

What happens if you uncheck key frame distance in Premiere Pro CS6

The default is 72 which is in frames I suppose. However what happens if I simply uncheck it? Does it work like AVC Intra where key frames doesnt exist and every pixel in every frame is processed like ...
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1answer
2k views

How to 2-pass h264 with CRF and maximum bitrate with ffmpeg?

Based on CRF Guide (Constant Rate Factor in x264, x265 and libvpx), quoting: Streaming nowadays is done a little more cleverly. YouTube or Netflix are using 2-pass or even 3-pass algorithms, ...
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1answer
358 views

H.264 video packet duration missing

I have H.264 files that, when I run FFprobe on them, like this: ffprobe -i h264_file.ts -show_packets -select_streams v ...it shows that each video packet has no values for duration, and no value ...
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3answers
2k views

What's the difference between “visually lossless” and real lossless and what does this mean for future encodes?

In FFmpeg's H.264 Video Encoding Guide we are told: Tip: If you're looking for an output that is roughly "visually lossless" but not technically lossless, use a -crf value of around 17 or 18 (you'...
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1answer
65 views

Identify H.265 from the OSX Command Line?

Can anyone suggest a way to tell the difference, from the OSX command line, between .mkv files encoded with H.265 from those encoded with H.264? Plex H.265 streams viewed from some devices (e.g. LG ...
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165 views

Reencode MKV (from DVD - Mpeg2) to h264

I have some old DVD that I already converted using MakeMKV, they seems to have the original mpeg stream, so I want to do this: Reencode the video stream to the more recommended settings for old-DVD ...
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0answers
789 views

AMD support for ffmpeg? Can't get my dedicated GPU to work

I'd like to ask for your advice. Recently I got refurbished Dell Latitude E6540 with two GPUs: integrated Intel HD Graphics 4600 and external AMD Radeon HD 8790M: 00:02.0 VGA compatible controller: ...
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1answer
692 views

What's special about Apple-device generated HEVC files that (apparently) x265 can't produce?

Take this file, the first 10s of Hank Green's "editing challenge". It is H264 video + AAC audio. You can take that file and import it into Final Cut Pro X (FCPX for short), and edit it to your heart's ...
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866 views

ffmpeg convert H264 CFR + timestamps to VFR

I have a H264 video source that was recorded with variable framerate (VFR) and a text file with frame ID, timestamp pairs that looks like this: frameId,timestamp 1890413473,13792093 1890413474,...
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3answers
310 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
442 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
153 views

Premiere Pro export black screen on mobile, just audio

I exported a 9:16 video (vertical, for Instagram stories) from Premiere Pro 2018, encoded with H.264 and AAC audio, VBR 2 pass. However, the video shows nothing but black screen on both my Samsung ...
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2k views

Help decoding video from hardware encoder

I obtained this video from directly reading the memory of a hardware encoder. The encoder supposedly produces a HEVC (H.265) or H.264 video stream, but I can't accurately play or convert the file with ...
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2answers
6k views

Does Youtube accept 10bit uploads? If so, what codec should I use?

I am launching a series of videos to Youtube. These videos have a black background and lots of colored gradient changes. 4k, 60fps. Unfortunately this picture style is causing terrible banding ...