Questions tagged [transcoding]
The process of converting a media file from one format to another or changing the compression settings used.
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81 views
Best way to handle stream with ffmpeg and GPU
So in my project, I need to capture a video stream, decode the video, run the individual frames through an object detection algorithm and then play the output as a video.
This whole operation is ...
0
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1answer
31 views
Video Assets to test transcode quality
I was wondering if anyone knows from where I could get a few (short) video assets in high bitrate to check the quality output of a transcoder.
Some context: A few years ago I was working on a VOD ...
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2answers
29 views
How to transcode HEVC footage on a mac if you don't have CC2018 yet [duplicate]
Is there a good free way to convert iPhone HEVC footage to .mov prores or something similar using a Mac (MacOS 10.12) with Premiere CC 2017? Googling provides lots of unreliable looking apps from ...
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0answers
35 views
Improve FrameServer performances
I followed ffmpeg guide to install debugmode frameserver.
All works fine except with the fact that the frames served does not goes up to 25 fps. FFmpeg reports a speed of 0.9x..
My initial goal ...
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0answers
49 views
FFMpeg set language as Unknown or unspecified in a QuickTime MOV
I have to transcode with FFMpeg some video with multiple audio where various audio track are not language related, just music and so on.
I would like to assing as language something like Unspecified, ...
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1answer
50 views
If I use a normal build of ffmpeg how take advantage of video acceleration for scale?
I generally use ffmpeg for encode in h264 and also resize media
My common command is something like:
ffmpeg -i in.mov -c:v libx264 -preset ultrafast -b:v 5000k -s:v 1280x720 out.mov
I have an ...
1
vote
2answers
357 views
How to concatenate 2 MP4 videos to output of certain bitrate?
I've already read the other articles about concatenating but couldn't find any that discuss specifying the output bitrate.
I have 2 MP4 videos.
What I want to do is speed up the first video to 110% ...
1
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1answer
339 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 ...
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2answers
231 views
How should I interpret the results from Netflix VMAF
I've been encoding some clips and then analyzing them with the VMAF tool from Netflix, but I don't know how to understand the results.
This is the overall mean section of one of my tests.
...
0
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1answer
216 views
Transcode each stream in a different thread with ffmpeg
Is there a way of forcing ffmpeg to encode each audio stream in a different thread?
ffmpeg
-i audio1.ac3 -c:a libopus
-i audio2.ac3 -c:a libopus
-i audio3.ac3 -c:a libopus
output.mkv
...
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1answer
30 views
broacast tv specs.
can any one help me about how can i deliver this specs for a broadcast tv channel ? :
im using fcpx and compressor 4. do i need any other app or can i manage it with those ?
which specs i do on fcp ...
0
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1answer
120 views
Blu-ray transcode to H.265 using Intel Quick Sync Video
Blu-ray transcode to H.265 using Intel Quick Sync Video
I just started a process of transcoding about 100 video discs (with DTS-HD Master Audio on passthrough) from my collection of Blu-rays and want ...
0
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0answers
444 views
Encode or Transcode with ffmpeg and libx264 as fast as possible
I'm trying to tune out ffmpeg to squeeze as much fps as possible from my server machines with lot of cores.
Sometimes expecially when there's also a scale (eg: shrinking down from 4k to full hd or ...
2
votes
1answer
978 views
ffmpeg transpose=clock rotates 180 degrees instead 90
I have 2 similar videos created on the same mobile. The first one can be downloaded here.
If I'm using the following command the result is correctly rotated by 90 degrees:
ffmpeg -i 20180114_193135....
1
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1answer
897 views
Transcode 5.1 audio in ffmpeg leads to incorrect audio mapping in output
I need to transcode some high res videos (prores or dnxhd files with 5.1 uncompressed 48kHz audio in MOV container) to their low res h264 with AAC keeping the audio still in 5.1 preserving their ...
1
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1answer
2k views
RTSP to RTMP converting fails after specific time only when IP camera enters night mode
I have bought a cheap IP camera Escam QF002 producing output in RTSP.
I'd like to secure it with RTMP or HLS stream served by nginx with nginx-rtmp-module.
For this I'd copy the video stream (h264) ...
0
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1answer
432 views
How to make ffmpeg flush the subtitles in real time while transcoding?
I'm feeding ffmpeg from stdin and do several transcoding operations in one command only. The issue is that ffmpeg seems to transcode them(or at least write on disk) sequently (i.e. first it transcodes/...
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vote
1answer
1k views
Convert video from 24 fps to 25, shortening length (no frame duplication), keeping audio pitch
I have a .mov video with 24fps and 5.1 audio.
Is it possible change the framerate from 24 to 25 fps with no frame resampling (no frame duplication / removal - just new framerate interpretation) and ...
1
vote
2answers
100 views
Encoding low bitrate video source file to a higher bitrate
I need to know if there will be any difference in the quality of the encoded video if the bitrate of the source file is, let's say 2000kbps and I encode it to 4000kbps.
Any help will be much ...
1
vote
0answers
331 views
HLS Preset Settings 240p, 360p, 480p, 720p and 1080p
I am trying to transcode mp4 videos into HLS using AWS transcoder. I see that there are only few presets available which are like 1M, 1.5M and the highest 2M. I am unable to get 240, 360 , 480,720p ...
2
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1answer
123 views
Recover mangled VirtualBox-generated WebM video
When being called by the Indian "Microsoft" department I let them join in on my VirtualBox virtual machine, and started a video capture to catch any details on them. Doing so, VirtualBox creates ....
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1answer
971 views
Convert MXF files into CBR TS
I am trying to convert couple of rather large MXF files into TS files preserving the video and audio encoding. The output TS has to be CBR Mpeg-2 TS file, which I know is not possible with ffmpeg. Any ...
0
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1answer
110 views
Add filter to prores file
I have captured some Mini-dv home videos to .avi.
With ffmpeg I converted to prores v2 .mov files.
Now i need to add yadiff filter.(interlaced -> noninterlaced)
Is is possible to "update" my files ...
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0answers
28 views
Best encoding setting for presentation like video
I have a video series that have a low fps by nature. The videos are in presentation format with audio.
The video is produced using Adobe Premiere Pro CC 2015 and contains 4K image clips and 256kbps ...
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1answer
96 views
Converting to Uncompressed Video Files
I'm looking for a method to convert compressed video files (like h.264) into uncompressed formats for editing.
What are the best options to look at?
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1answer
827 views
Resolve Transcoding Workflow
I'm struggling to find an optimal workflow with Resolve 14 involving XAVC-S video. I need to transcode to ProRes 422 (HQ) to edit and grade within Resolve.
At present I am bringing all my source ...
1
vote
1answer
238 views
Questions on workflow: 12G-SDI to 500Mbps to RTSP stream
(Background: I'm relatively familiar with using ffmpeg and libx264 to produce videos on demand, but I'm quite new to live streaming)
I'm currently tasked with a project to compress a 4K camera's raw ...
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2answers
1k views
Simple: Can HTML5 Play a .mpd Manifest File Through Its Video Tag?
I have a Movie_Manifest.mpd file that is made up of 5 .webm video streams (consisting of different sizes and bps) and 1 audio file. The question I'm asking is: can it be played through a "simple" ...
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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 ...
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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 ?...
4
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3answers
171 views
How do I know if a video file is encoded perfectly or not?
I have to encode (transcode) many video files (usually from AVI to MP4). But to see if the encoded files are correct or not I will play all the files manually, which is rather tedious.
Is there any ...
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1answer
1k views
ffmpeg “Error while opening encoder for output stream #0:1”
Ok, this is probably a very stupid mistake on my part, but I am losing my head here. I have been using a simple command for transcoding MOV file for months now:
ffmpeg -i SOURCE.mov -c:v libx264 -...
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0answers
548 views
Transcode FROM MPEG-DASH
I have an input MPEG-DASH stream and I want to transcode it.
First of all, need to decode it and then route an output to FFmpeg and encode it, but not have any ideas how to decode MPEG-DASH. Please ...
2
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2answers
4k views
Why when you specify a video bitrate with ffmpeg does the resulting files displayed bit rate differ?
I'm fairly new to transcoding.I've been generating some mp4's from mxf files.
I've been playing around with some settings on ffmpeg and been specifying various bitrate's for audio and video with the -...
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0answers
730 views
FFmpeg transcoding libx264 set only one P-frame
I transcoding mpeg2 data to h264 via libx264 codec and need to create the following GOP structure:
I(IDR) P I P
I try to perform it with the following command:
ffmpeg -i INPUT -vcodec libx264 -...
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1answer
487 views
FFmpeg transcoding GOP pattern IP
I need to transcode mpeg2 video via H264 codec and GOP structure should be IP.
I use the following command for this:
ffmpeg -i INPUT -vcodec libx264 -x264-params
keyint=2:scenecut=-1:ref=1 -...
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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 ...
0
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2answers
106 views
DVD not displaying full picture
I have created a DVD from video files, originally FLV 1280x720p files.
Although I followed the support literature and help guides, approx 10 pixels are missing vertically and approx 20 horizontally ...
0
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1answer
755 views
Transcoding 100+ files from H.264 to H.265
I am in a process of transcoding 100+ High Quality Bitrate 720p MKVs containing H.264 (x264) to H.265 (x265 / HEVC).
I do this with HandBrake software under Linux Debian 9 on Intel Xeon E3-1225 v3 3....
0
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1answer
418 views
How do I remove excess video duration in ffmpeg when using lavfi?
My goal is to take clips that last over 40 seconds and overlay them on a background, then trim the total time once the clips and background fade out. It works great, except the seeking goes up to 24 ...
0
votes
1answer
682 views
Delaying video overlay in ffmpeg without frame drops
I'm trying to play 2 videos overlaid against a static background, with the 2nd video (and its audio) delayed by a couple seconds. When I do this, ffmpeg complains about buffer overflow and the 2nd ...
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2answers
125 views
Why you need hardware (e.g. capture card) for video input?
To fully understand the how it works: you pick any device with HDMI output (let's say GoPro to reduce the variations) and you'll need a capture card for retreaving the data as multimedia signal. ...
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1answer
4k views
ffmpeg transcoding H264 interlaced and keep interlacing via H264_NVENC codec
I have the following interlaced H264 file:
Stream #0:0[0x335]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuv420p(tv, bt470bg, top first), 720x576 [SAR 16:11 DAR 20:11], 25
fps, 50 tbr, 90k ...
4
votes
2answers
858 views
restart ffmpeg job from failure
Is there a common technique or some sort of strategy for restarting a failed transcoding job from where it had left off when it crashed (or stopped for whatever reason)?
For example, if I have a 2 ...
6
votes
2answers
2k views
How many NVIDIA NVENC engines a particular GPU have?
There is a NVIDIA VIDEO CODEC SDK APPLICATION NOTE - ENCODER in which we can read the following:
While Kepler and first generation Maxwell GPUs had one NVENC engine, certain
variants of the ...
1
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1answer
41 views
Downscale to “native” look
I want to downscale UHD-1 videos to 1080p. According to this and on other websites the Lanczos method should give best result for downscaling.
However my goal is to downscale a video in a manner like ...
0
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0answers
86 views
Any ffmpeg computing nodes out of there?
Sadly I don't have access to powerful workstations and it happens that I have to convert lot of videos, however I do have an high bandwidth network.
Is there a free/paid computing cluster service ...
1
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0answers
89 views
Transcoding AVCHD MTS to Motion JPEG on a Mac
Bigtime video neophyte and I've not been able to figure this out after a day of trying. Hopefully this isn't a big deal - pls assume I know nothing.
I have some AVCHD MTS files from my camcorder ...
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1answer
724 views
ffmpeg / mencoder converting a video with correct setting
I have an avi video file that plays on my Onn-W7 player Link to avi video file that works and backup link to avi file that works. I'm trying to convert some other video files over so that they will ...
0
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1answer
747 views
How to create MPEG-DASH variants at resolutions where one dimension is not a whole number in pixels?
I've created a bunch of variants and a DASH manifest for Sintel, which more or less works, but does not pass validation. The issue is when I want to scale a video to a specific width, but the height ...
