Questions tagged [transcode]

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59 views

Subtitle sync while transcoding and streaming

I am using VLC to embed an .srt file into an .mp4 file. In most cases I am successful and the subtitle is in perfect sync with the video. However I have one episode that the subtitle starts about 8 ...
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27 views

VLC Transcoding a 4k Picture to RTP transport stream

After a lot of crying, stamping my feet and pulling my hair out, I have now managed to transcode my 4k capture card into an RTP MPEG2 transport stream using VLC, as per the below: vlc dshow:// :dshow-...
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1answer
507 views

Can I transcode a file with FFmpeg and read the output file on-the-fly?

I have a .M3U8 stream and I can download it and convert it with FFmpeg: ffmpeg -protocol_whitelist file,http,https,tcp,tls -i "org_file.m3u8" -c copy -bsf:a aac_adtstoasc output.mp4 However I can't ...
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43 views

Delay in video transmission UDP

There is no synchronization problem, but the image appears 5-8 seconds after the sound, how can I solve it? ffmpeg -hwaccel_device 0 -hwaccel cuvid -c:v h264_cuvid -deint 1 -y -i http://192.168.5.100:...
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1answer
93 views

what is the limitation on max cuda instances for video transcoding?

I have set up Nvidia V100 card on Azure Nc6s_v3 virtual machine. I have set up the latest CUDA driver and SDK. I compiled sample programs from "Video_Codec_SDK_9.0.20" and verified the max parallel ...
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132 views

ffmpeg converting from 25p to 50i issues

We try convert 25P mp4 file to interlace 50i, but if we try extract sound he shifted forward to 1 frame and cut to end for 1 frame and If I've try export audio via VLC CLI and have normal duration. . ...
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235 views

Optimal ffmpeg-transcode settings, including color-space, color-range etc.?

First, let me explain the situation: I have a whole boatload of various kinds of videos that I wish to trancode to HEVC in order to save storage-space. I do realize that there's some amount of loss in ...
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597 views

HW accelerated transcoding with ffmpeg

I've made some backups of some blurays using MakeMKV and now I'm trying to transcode the series to reduce the file sizes to something that is a little more reasonable while maintaining as much quality ...
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0answers
969 views

Why do audio files converted from OPUS to M4A have a much higher bitrate?

When doing: youtube-dl -xf bestaudio/best <link to playlist> ...I get a lot of OPUS files at relatively "normal" bitrates like 130kbps. However, when I run the same command with the ...
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2answers
202 views

Is it safe to omit the codec when converting with ffmpeg?

I noticed today that I could encode or transcode video and audio streams using ffmpeg without specifying a codec, due to the fact that it seems to imply the video or audio codec being encoded or ...
2
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0answers
323 views

How 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 ...
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173 views

Unable To Transcode 8 Sources In One Instance Real Time (FFmpeg)

Just the other day I posted about my inability to transcode a multitrack video real time, -rc-lookahead ended up being the solution. However this was when recording fairly static signals, when each ...
2
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1answer
82 views

Multitrack Video Does Not Transcode Real Time

Recently this Github page, dedicated to bypassing Nvidia's encode limit, added windows support: https://github.com/keylase/nvidia-patch/tree/master/win Up until now I've been encoding my 5 live ...
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0answers
54 views

ffmpeg transcode loss information [closed]

I have a system taking videos of various formats as input and transcoding them into the same format for storage and processing and semantic analysis such as object detection. First, I wonder is this ...
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1answer
126 views

ffmpeg transcode twice compress further?

I have a collection of avi videos (say A). I first convert them into MPEG4 Part2 (say B) using ffmpeg -i ${inname} -vf scale=340:256,setsar=1:1 -q:v 1 -c:v mpeg4 -g 12 -f rawvideo ${outname}. The ...
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1answer
317 views

FFmpeg 4 versus version 2.2 very slow transcodes in VMWare CentOS 6 container

Whist using "ffmpeg version n4.0.1" I've noticed that on CentOS6 host within a VMware container the video transcoding takes almost twice as long as "ffmpeg version 2.2.1". Benchmarks below, ran 3 ...
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0answers
828 views

Getting Intel Quicksync working in Ubuntu 16.04 in headless mode for HW transcoding

/dev/dri and /usr/lib/dri doesn't exist. vainfo returns: error: can't connect to X server! error: failed to initialize display Aborted lspci | grep VGA returns: 00:02.0 VGA compatible controller: ...
2
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1answer
230 views

Reject DTS-HD MA

I have couple of video files containing both regular DTS as well as DTS-HD MA audio tracks. I want to get rid of the DTS-HD MA audio streams during transcoding, but have not figured out how to do so. ...
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1answer
51 views

bash script variables not proper

I updated it a little bit, but I'm still not getting the results I should be getting: #!/bin/bash find "$1" -type f | while read filename do videoCodec=$(ffprobe -v error -select_streams v:0 -...
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1answer
207 views

Ffmpeg transcoding video .vob (vcodec MPEG-2)

I want to transcode a file .vob to get the bitrate 1500 with 16/9 ratio I execute this command ffmpeg ffmpeg -i /path/video.vob -vcodec libx264 -vf scale=1280:-2 -strict experimental -b:v 1308k -b:a ...
2
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1answer
5k views

Why is Plex Server transcoding file that can be direct played?

I've installed Plex Media Server in my Raspberry Pi 3. It works perfect but it doesn't have enough CPU power to transcode (when it tries the video freezes every two or three seconds). One of my Plex ...
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2answers
2k views

Intel i5 Kaby Lake Hardware-Assited transcoding of video and audio to VP9 and FLAC using ffmpeg

I have about 30 gigabytes of video (mostly MP4, some MKV and webm) I need to transcode to 8-bit VP9 with Free Lossless Audio Codec (FLAC) audio in an MKV container from various input codecs (AAC audio;...
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1answer
487 views

Maximising efficiency of my M4A music playlist

Reading this answer here and questions like: What lossy audio formats are more (or less) "efficient"? Are there any perceptible differences between the sound quality of 192 versus 320 kbps ...
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0answers
1k views

openload.cc How can I extract encoding settings of videos?

My customer needs streaming service for his IP cameras and he ask me about same output quality as videos in openload.cc but I can´t simulate similar quality.I tried several encoding combination but ...
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1answer
646 views

Any alternatives to VLC transcode for online stream?

I have 2 favorites public radio stations that I always wanted to listen on the phone but due to high quality 192kbps I was not always to listen because it needed good connection. Now using windows VLC ...
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0answers
334 views

Stuttering in VLC-Transcode

I'm trying to transcode a working internet stream to something my Dreambox could play. My current status is that I can play it on my desktop and on Dreambox, however, there is some constant ...
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1answer
4k views

Transcode Multiple Video Files at a Time in VLC

I am using VLC to transcode video files, in the convert/save menu it lets you select multiple files, but when you click Convert, it just converts the first file in the list. Ideally I would be able to ...
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1answer
1k views

Bulk transcoding ISO/IMG to MP4/MKV

I need a tool/script to help me convert my collection of DVD's to MP4. I've started using Plex instead of playing each image-file directly and it's quite a pain in the butt to manually convert a ...
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0answers
824 views

FFMPEG stop working with no error

I am using FFMPEG to create a video using pictures as input. I never had a problem with it, but now for some jobs I can't get correct outputs, some of them are broken. Using FFPROBE to check the ...
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317 views

handbreak does not extract subtitles

i have a personal DVD i am trying to backup to a medium that will not go the way of the 5" floppy... when i "rip" it via handbreak, i select subtitles, then i click "add all" and the subtitle does ...
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1answer
362 views

How do I transcode/compress mp4 source files on the Linux command line?

I have some rather large mp4s produced by my phone. They aren't very long, so they're probably not very compressed. What's an example of using a command line Linux tool to transcode one of these to ...
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1answer
237 views

How to batch convert to mp4 with arista-transcoder?

I dont understand how to list valid preset names and select the Computer - H.264 preset available in the arista-gtk listing. When I batch convert like arista-transcode -p "Computer - H.264" *.wmv the ...
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2answers
1k views

ffmpeg equivalent for -movflags faststart for audio

I have several video and audio files on my server that I wish to stream. I have converted all video files to mp4 and audio files to aac. Now I am streaming both type of files but it seems audio ...
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0answers
198 views

Downsampling and streaming video over a LAN (WiFi)

I have a Linux file server at home, and I'd like to watch video stored on it on my desktop. A very simple solution comes very close: use any old HTTP server to serve up the files, and view them in ...
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1answer
2k views

Transcode RTMP Live stream to multiple clients

I regularly follow livestreams on the website picarto.tv. The website uses RTMP for streaming, and therefore requires flash to show the video source. Many (mobile/embedded) devices don't have flash ...
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2answers
2k views

Cut an FFmpeg video based on frames not a timecode

I want to cut a video with FFmpeg using something similar to the code below: ffmpeg -i movie.mp4 -ss 00:00:03 -t 00:00:08 -async 1 cut.mp4 However I want to specify -ss and -t in frames instead of ...
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0answers
176 views

Can a processor gpu still be used for video transcoding if the motherboard is disabled from using processor gpu?

I am planning to get the following motherboard and cpu. Asrock Rack e3c224d4i-14s Intel Xeon e3-1276v3 However, after reading the spec sheet on Asrock Rack/Intel Ark, the above mentioned motherboard ...
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0answers
1k views

FFmpeg - Transcode video and keep original EXIF metadata in the transcoded file?

I am trying to transcode a video from a .mov (recorded with the iPhone) and add the original metadata (EXIF) to transcoded file, how can I achieve that? The original video contains EXIF metadata, etc. ...
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1answer
2k views

FFmpeg - Cut video into segments, transcode them individually, then concatenate & output to .ts

This is a follow-up question to audio error when concatenating clips using ffmpeg What I'd like to achieve is the following: Cut an input video into chunks Transcode each chunk (video and audio) ...
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1answer
289 views

Converting problematic 9.99fps video to something standard (ffmpeg?)

I recently got some CCTV video released to me via a FOIA/PA request. I'd like to put up the full version on YouTube, as well as version edited w/ Final Cut Pro. However, Handbrake, Quicktime, Final ...
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0answers
24 views

How can I transcode “faster playback speed” videos? [duplicate]

I'd like to transcode a video to have faster playback speed, for use on mobile devices / chromecast. VLC has this capability, but it seems to only work during playback. For example, if I use the ...
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0answers
2k views

How can I reduce the choppiness of my ffmpeg conversions

Here are the options I'm sending ffmpeg: ffmpeg. -i input.flv -crf 18 -profile:v baseline -level 3.0 -pix_fmt yuv420p -preset veryslow output.mp4 Here's the input file: http://ct.recorder.s3....
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0answers
1k views

Why does VLC cut off the end of my video when transcoding?

I am trying to "bake in" a custom made subtitle file (Advanced SubStation Alpha) for a short (3:46) video. However, despite trying an assortment of commandline options, VLC seems to always cut off the ...
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1answer
3k views

Transcoding Video to QuickTime Animation (RLE)

I need to transcode video created using the Camstudio Lossless Codec into the QuickTime RLE format in order to get it to work with some other software. What methods can I use to convert the video? I ...
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2answers
8k views

Which FFmpeg command do I use to passthrough FLV to MP4?

I've a number of downloaded FLV files which I would like to convert to MP4. They are already in the correct format so I am told all I need to do is to remux the video and audio streams into an MP4 ...
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1answer
1k views

Why does FFmpeg segment_times create webm files with incorrect duration and start times?

I have a MOV file that I want to split into several smaller files (at certain timestamps in a comma-separated list). I'm simultaneously compressing the video into WEBM files. The command I'm using ...
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1answer
768 views

VLC bash transcoding script destination directory

Well, I have such transcoding script: #!/bin/bash acodec="vorb" arate="256" ext="ogg" vlc="/usr/bin/vlc" fmt="mp3" for a in *$fmt; do $vlc -I dummy -vvv "$a" --sout "#transcode{acodec=$acodec,...
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1answer
898 views

VLC bash transcoding script output to file

I'm running such script to transcode my audio files: #!/bin/bash acodec="vorb" arate="256" ext="ogg" vlc="/usr/bin/vlc" fmt="mp3" for a in *$fmt; do $vlc -I dummy -vvv "$a" --sout "#transcode{...
2
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0answers
3k views

FFMPEG - Stream discovered after head already parsed

I am trying to live transcode an RTMP stream to another RTMP HLS stream using the following command: ffmpeg -re -i rtmp://localhost/videochat/testing -c:v libx264 -c:a:0 libfaac -b:a:0 480k -f flv ...
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1answer
429 views

Use ffmpeg to transcode only wma lossless files and not wma files

I have a list of wma files with wma lossless files as well, and what i want to do is to use ffmpeg to transcode only those which are wma lossless and not the wma files. As we cannot distinguish these ...