Questions tagged [h.264]
The h.264 tag has no usage guidance.
175
questions
0
votes
1
answer
931
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/...
0
votes
0
answers
25
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 ...
- 101
1
vote
1
answer
485
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 ...
- 123
1
vote
0
answers
289
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 ...
- 111
0
votes
0
answers
194
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.
...
- 101
1
vote
0
answers
542
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 ...
- 91
1
vote
1
answer
289
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 ...
- 11
2
votes
0
answers
425
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 ...
- 121
1
vote
1
answer
10k
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 ...
- 55
0
votes
1
answer
1k
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 ...
0
votes
2
answers
3k
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, ...
- 145
0
votes
1
answer
755
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 ...
3
votes
3
answers
4k
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'...
- 2,134
1
vote
1
answer
395
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 ...
- 145
0
votes
0
answers
457
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 ...
- 11
1
vote
0
answers
2k
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: ...
- 21
3
votes
1
answer
986
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 ...
- 71
1
vote
0
answers
1k
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,...
- 111
1
vote
3
answers
563
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 ...
- 25
0
votes
1
answer
568
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 ...
- 25
0
votes
1
answer
290
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 ...
0
votes
0
answers
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 ...
- 101
1
vote
2
answers
10k
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 ...
- 111
4
votes
3
answers
9k
views
Configure CQP (CRF) for h264_nvenc
Encoding on CPU can be done via:
ffmpeg -i input.mp4 -vcodec h264 -crf 23 -acodec copy h264.mp4
GPU's alternative for the codec is h264_nvenc. How can I pass the same options to it?
I googled and ...
- 183
2
votes
3
answers
2k
views
Does HDR content have anything to do with codecs?
I am new to video codec(encoding/decoding) stuff. I am trying to understand the difference between H.264(AVC) and H.265(HEVC) HDR video content. I thought HDR video 'means' it has 10 bit color depth ...
- 31
0
votes
0
answers
292
views
Reduce CPU usage when downscaling HD>SD>Low on the same codec (H264)
I'm using ffmpeg over 3 years now mainly I'm doing live broadcasting on my site , currently I'm preparing to do 5 livebroadcast on the same time using my VPS server CPU E3-1240 v5 OpenVZ Since I'm ...
- 131
1
vote
1
answer
2k
views
FFmpeg only and only change H264 profile and level?
I am use FFmpeg v4.1 . I want to change H264 profile and level but I want other settings to stay the same. I just want to change the profile of H264.
I'm using this code, but I'm getting the error.
-...
user18109
3
votes
2
answers
5k
views
What is the correct format of media creation time?
I noticed my GH5 via ffprobe has metadata such as:
Metadata:
creation_time : 2018-12-31T09:17:48.000000Z
timecode : 06:19:42;19
This is actually my local time, so off that bat, ...
- 181
0
votes
0
answers
492
views
Correct export in Premiere to Vimeo & YouTube in FULL RANGE 0-255
I'm working in Adobe Premiere on some sequences (Full HD, Progressive, 8bit).
In these sequences I added also some matte black backgrounds and after effects comps with black background and other ...
- 1,504
-1
votes
2
answers
866
views
Grime-like blocking compression artifacts on the decompressed video (H.264)
During watching H.264 compressed videos one faced several times with an artifacts.
Example 1:
Example 2:
Wikipedia's article [1] tells that the typical reason is «Data errors in the compressed bit-...
- 125
0
votes
1
answer
63
views
Video cam with poor compression ratio (H.264 produces videos at 2.9MB/sec)
I just purchased a cheap dashboard video-camera that is advertised to have a H.264 codec inside. However, after the first video test I have seen that a 43sec movie takes 123MB! How is this possible. I ...
- 101
2
votes
1
answer
4k
views
How to choose the right bitrate, H.264 profile and level for Web Video presentation?
I want to start producing videos and looking around the internet for usual bitrate ranges (VBR) and H.264 profiles and levels for Web Video exports.
I found some guides with Vimeo and YouTube and ...
- 123
0
votes
1
answer
850
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 ...
- 342
0
votes
1
answer
662
views
I'm using H264 encoding to encode video capture from a webcam. How do I turn of rc lookahead?
I want minimize encoding latency per frame. Right now, there is a high increase in encoding latency on the 46th frame. I think lowering the lookahead value might help with this. How do I do this?
...
- 3
1
vote
1
answer
4k
views
How to concatenate MPEG-4 and AVC/h.264?
I would like to use ffmpeg, mencoder or still something free.
I cannot concatenate two videos because of different video codecs:
$ mkvmerge -o merged.mkv 1.mkv \+ 2.mp4
mkvmerge v19.0.0 ('Brave ...
- 129
0
votes
1
answer
196
views
Different rate distortion curves for two videos encoded with same parameters in FFMPEG
I encoded two videos (ParkJoy and Sintel) in FFMPEG by H.264 with same parameters (GOP size, QP, frame rate, resolution etc.) and obtained rate-distortion plots (mean PSNR of Y channel vs bitrate). I ...
- 3
0
votes
0
answers
2k
views
Replacing I-frames in h265 stream
I'm trying to follow this tutorial: https://www.reddit.com/r/brokenanimegifs/wiki/tutorial
Everything works perfectly. On the basis of this tutorial, I even created my own little tool. It just ...
- 675
4
votes
2
answers
8k
views
Print to file: Details of every NAL unit in raw H.264 file
I have a raw H.264 file. I would like to retrive both length and frame number of every NAL unit in this file. The result must be printed to file.
Is there any tool to do this?
I have tried using H....
- 143
2
votes
3
answers
2k
views
Can you losslessly ediit H264 at the GOP level?
My scenario is this: I have a few .mp4 files containing H264 video with AAC audio. Each file was encoded from a DVR source. There are a few frames too many at both the beginning and end of the file (...
- 123
1
vote
1
answer
45
views
Getting gray instead of white when recording screen activity
I am recording from screen
however, the video when recording with a recording program, (screen around cursor mode) gets grayish
why?
Video settings are H264 - NVENC (VBR)
30 fps, 100q
- 171
1
vote
1
answer
504
views
Clip that plays fine in WMP is cut off in Sony Vegas
I imported a screen recording into Sony Vegas. When I play the original clip with Windows Media Player, it looks the way I expect it, with the whole screen visible. But when I play the clip in Vegas, ...
- 13
-2
votes
1
answer
1k
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
2
answers
13k
views
FFMPEG: Loop video to the length of audio
E.g. if video is 1 minute, but audio is 1 hour. Make video loop throughout for 1 hour of the audio track.
I use this solution to loop image through the lenght of the audio
ffmpeg -y -loop 1 -r 6 -i ...
- 143
0
votes
3
answers
2k
views
How do I convert H.264 Rec709 ("SRGB") to H.265 HEVC 10-Bit Rec2020 ("Wide Gamut")?
I'm looking to convert a standard colour gamut video to a wide gamut video. For example, I have a 1080p, 2K or 4K H.264 8-bit mp4. This is normally (eg. from YouTube) in Rec709 or "SRGB" colour space.
...
- 151
5
votes
1
answer
2k
views
Are JPEG compression and H.264 intraframe compression the same process?
I was looking at how JPEG compression works, and to me it seems to be really similar to what H.264 (and other video codecs) does with its intraframe prediction step.
In both algorithms the image ...
- 720
1
vote
1
answer
3k
views
ffmpeg rtsp over http not working
I put this conf on ffserver
HTTPPort 1234
RTSPPort 1235
<Stream live.h264>
Format rtp
Feed feed1.ffm
VideoCodec libx264
VideoFrameRate 24
VideoBitRate 100
VideoSize 480x272
AVOptionVideo flags ...
- 11
1
vote
1
answer
2k
views
H.264 adding dark anti-aliasing even on high444 yuv444p
I have a PNG file with white on red and no antialiasing at all - each pixel is either white or red, but when I encode it to MP4 using ffmpeg -i test.png -profile:v high444 -pix_fmt yuv444p -loop 1 -...
- 113
6
votes
1
answer
10k
views
It is better to have more B-frames or more P-frame for video streaming?
I'm trying to re-encode (H.264) some videos from my movie library in order to put them on a NAS and stream them to a smartTV through WiFi.
In order to do so, I'm using HandBrake on MacOS and – among ...
- 163
2
votes
1
answer
11k
views
Exporting h.264 from Premiere Pro resulting in black screen on Windows 7
We have multiple reports of our h.264 video playing audio-only in IE11 on Windows 7. The video screen stays black. I can reproduce the problem.
Here is an example video that exhibits the problem. ...
- 123
2
votes
1
answer
5k
views
How to set ffmpeg encoding framerate?
in short: I set -r 25 , but I see in the converting process that it's fps=18. Why?
I am trying to convert a video to H.264 format using ffmpeg, and I am trying to set the framerate(out framerate) ...
- 23