The process of converting a media file from one format to another or changing the compression settings used.
0
votes
0answers
57 views
Attempting to restream an MPEG-TS stream as RTSP resulting in loss of audio?
I am using ffmpeg and ffserver to restream various RTMP and MPEG-TS streams as RTSP. At first glance it appears to be working, but I am running into very weird behavior.
At least on two different ...
1
vote
2answers
55 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
vote
1answer
32 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 ...
0
votes
0answers
28 views
Transcoding mass video
I have a small video website based off PeerTube. The videos we upload need to be transcoded, some are old and wont be playable. I would like to know how I can transcode all the videos in a directory ...
2
votes
2answers
60 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
votes
1answer
82 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
...
0
votes
1answer
20 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
votes
0answers
163 views
Best settings in Media Encoder for fastest proxy transcoding?
What are the best settings/codecs in Media Encoder for the fastest proxy transcoding possible?
I manually added a new encoding+ingest preset to transcode the footage to very low resolution proxies. ...
0
votes
0answers
102 views
Why does transcoding video with ffmpeg add unknown frames?
I have a video file, which is the recording of an eye-tracking experiment, that I want to transcode to be able to process it in Matlab.
With ffprobe
ffprobe -v error -show_format -show_streams ...
0
votes
1answer
85 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
votes
0answers
209 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 ...
1
vote
1answer
261 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....
0
votes
1answer
278 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
vote
1answer
841 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
votes
0answers
18 views
Reverse engineer the CRF value used during transcoding by ffmpeg [duplicate]
I'm trying to learn about the transcoding settings used by Instagram for their videos for their progressive mp4 files. As an experiment, I uploaded 5 videos of varying bitrates(22Mbps to 2Mbps), using ...
0
votes
1answer
206 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/...
0
votes
1answer
616 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 ...
0
votes
1answer
61 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 ...
0
votes
0answers
81 views
HLS Video encoded at Amazon Elastic Transcoder remains on lower quality
I am having troubles with HLS videos encoded at Amazon Elastic Transcoder using their own builtin HLS presets. I have a 1080p source file that I have uploaded.
When playing back, the video won't ...
1
vote
0answers
206 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
votes
1answer
100 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 ....
0
votes
1answer
594 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
votes
0answers
125 views
transcode speed is faster than pure decode
I applied these two cmd but the result contradicts with the intuitive ideal.
cmd 1. ffmpeg -i FHD.mp4 -an -vf scale=480:240 -f h264 /dev/null
cmd 2. ffmpeg -i FHD.mp4 -an -vf scale=480:240 -f null /...
0
votes
0answers
94 views
transcode interlaced video
I have a full HD (1920 X 0180) movie in interlaced mode.
However, it seems that safari cannot playback interlaced move (I am not sure ?)
So I need to transcode it to progressive.
from intuitive ...
0
votes
1answer
62 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 ...
1
vote
0answers
18 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 ...
0
votes
1answer
67 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?
1
vote
0answers
466 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
143 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 ...
0
votes
2answers
663 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" ...
1
vote
0answers
375 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 ...
-3
votes
1answer
55 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 ?...
3
votes
3answers
118 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 ...
0
votes
1answer
766 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 -...
0
votes
0answers
114 views
VLC: transcoding via command line
I want to transcode a file produced by a screen capture app, with variable frame rate, a produce a h.264 encoded, fixed frame rate version that I can edit in Adobe Premiere Pro.
I see that there is ...
0
votes
0answers
403 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 ...
1
vote
2answers
1k 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 -...
0
votes
0answers
357 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 -...
0
votes
1answer
306 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 -...
0
votes
1answer
1k 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
votes
2answers
83 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
votes
1answer
598 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
votes
1answer
323 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
557 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 ...
-1
votes
2answers
106 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. ...
2
votes
1answer
3k 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
602 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
vote
1answer
39 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
votes
0answers
46 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 ...
