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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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1answer
16 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 ...
-1
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0answers
26 views

Exporting a PNG Image Sequence with Transparent Background

I have been taking a relatively simple series of PNG images animating an "explosion", importing them into various open source software packages, and exporting the same images to see how the software ...
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2answers
24 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
17 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
24 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
21 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 ...
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2answers
205 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% ...
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1answer
124 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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47 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 ...
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2answers
152 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. ...
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1answer
163 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
25 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 ...
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0answers
372 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. ...
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0answers
188 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 ...
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1answer
104 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 ...
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0answers
347 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
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1answer
643 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....
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1answer
569 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 ...
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1answer
1k 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) ...
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0answers
20 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 ...
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1answer
336 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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1answer
865 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 ...
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2answers
89 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 ...
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0answers
138 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 ...
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0answers
285 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
115 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
770 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 ...
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0answers
156 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 /...
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0answers
153 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 ...
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1answer
89 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
23 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
89 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
681 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 ...
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1answer
187 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
981 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
495 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
66 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 ?...
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3answers
145 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
141 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 ...
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0answers
496 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 ...
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2answers
2k 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
554 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
398 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 ...
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2answers
95 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 ...
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1answer
669 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....
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1answer
374 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 ...
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1answer
619 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
120 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. ...