Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [transcoding]

The process of converting a media file from one format to another or changing the compression settings used.

1
vote
0answers
111 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
votes
1answer
32 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 ...
0
votes
2answers
32 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 ...
0
votes
0answers
37 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 ...
0
votes
0answers
59 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, ...
0
votes
1answer
52 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
397 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
381 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 ...
3
votes
2answers
247 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
219 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 ...
1
vote
1answer
31 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
1answer
122 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
462 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
1k 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
vote
1answer
961 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
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
votes
1answer
444 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/...
1
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
101 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
339 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
124 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
1k 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
1answer
115 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
30 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
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?
1
vote
1answer
840 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
244 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
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" ...
1
vote
0answers
583 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
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 ?...
3
votes
3answers
181 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
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 -...
0
votes
0answers
550 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
votes
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 -...
0
votes
0answers
751 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
494 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
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
votes
2answers
110 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
760 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
427 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
691 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
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. ...
2
votes
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 ...
3
votes
2answers
875 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 ...
5
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
43 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
87 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
vote
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 ...
0
votes
1answer
734 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
votes
1answer
752 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 ...