FFmpeg is a free software project that produces libraries and programs for handling multimedia data. The most notable parts of FFmpeg are libavcodec, an audio/video codec library used by several other projects, libavformat, an audio/video container mux and demux library, and the ffmpeg command line ...

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63 views

ffmpeg framemd5 format explanation

Does a frame consist of audio and video or just video? I am trying to verify if this can be used for confirming both audio and video data were successfully sent or if I need to handle the audio ...
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2answers
3k views

How to do a video live stream through a VPS?

I've been looking at a million resources and I can't find a definitive answer to this. I'm looking to do a small scale (max 50 viewers possibly), low quality live video stream, with nothing but my ...
2
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1answer
2k views

restart encoding with ffmpeg when bad source

I have an ffmpeg process which saves a stream from wowza server, but when the stream in wowza is interrupted for a second or so sometimes ffmpeg cycles in: [segment @ 0x671a10] st:0 PTS: 9600015 DTS: ...
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1answer
125 views

Freeze frame effect with ffmpeg

I am currently fiddling with ffmpeg to achieve a freeze frame effect and so far have been unsuccessful. I have been able to do this with adobe after effects shown here. However I would like to achieve ...
2
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1answer
456 views

How to specify CRF quality settings for different encoding software

Is there a way of specifying a quality setting for h.264 that is not software dependant? I'm trying to help a colleague create a specification for outside contractors when they deliver video to us ...
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2answers
433 views

FFMpeg and HLS, videos need to load in their entirety before they start playing

I am using ffmpeg to generate a segmented list of files in order to stream them to an iOS app. The list of files is generated fine but when it comes time to play them, the video needs to be downloaded ...
2
votes
1answer
374 views

Lossy output with FFMPEG JPEG 2000

I'm trying to achieve a lossy JPEG 2000 output with FFMPEG, but no success so far. Using this command line: ffmpeg -i input.dpx -pix_fmt yuv420p -vcodec libopenjpeg output.jp2 As a result I get ...
2
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1answer
117 views

How do I prevent Quality loss in the beginning of a video?

My company transcodes videos sent in by users (recorder by our own screenrecording software) I use FFMpeg to do the work using this command: /ffmpeg/ffmpeg -i in.mov -vcodec libx264 -fpre ...
2
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1answer
84 views

Converting files to Avid-friendly DNxHD MXF

Please forgive the noob question, I'm new here. I've looked for an answer on this forum but not found one so far. I've also tried the BMXlib forum. I'm trying to convert small video files that have ...
2
votes
1answer
56 views

How to extract Xtra atom from MP4 file?

Can one dump/extract the Xtra atom from an MP4 file ? I am looking for a solution on a linux system (debian/jessie if possible). Apparently this atom is used by WMP, as per link. I'd like to be able ...
2
votes
1answer
99 views

HTML5 background video encoding settings

I'm doing a full page background video and I'm trying to convert the original mp4 to an webm. The background will not have any audio. I'm currently using ffmpeg. ffmpeg -i INPUT.mp4 -b 614400 -s ...
2
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1answer
333 views

ffmpeg Color conversion - 709 to 601

I am downscaling an HD movie from 1920x1080 to 720x576 and want to make sure the color conversion is done correctly, which with my current settings I am sure it is not. I am coming from an HD Prores ...
2
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1answer
86 views

ffmpeg adds unneeded zero samples at beginning of resulting m4a file

Input file original.wav ffmpeg -i original.wav ... Duration: 00:03:36.93, bitrate: 1411 kb/s Convert wav to m4a with fdk-aac encoder: ffmpeg -i original.wav -c:a libfdk_aac -vbr 5 ffmpeg.m4a ...
2
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1answer
254 views

Output file longer than source with ffmpeg

I'm producing several versions of a clip (320x180 24 fps and aprox 2Mbps) compressed with h.264 with ffmpeg using Avanti. Each version has different framerate. The video output has a slightly ...
2
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1answer
123 views

Reduce quality percentage wise

I have several movie files in a mkv container. ffmpeg -i filename gives me the following output: Stream #0.0(eng): Video: h264 (High), yuv420p, 1280x720, PAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k ...
2
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1answer
373 views

How to get a crisp, exact color match for lossless screen-cast?

Background Recording a screen-cast (no audio) in Xubuntu Linux. The following image shows a side-by-side comparison of the video (left) versus the desktop (right): The screen-cast is recorded ...
2
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1answer
178 views

disabling streams in quicktime movies with ffmpeg

In Quicktime pro you can turn off streams in movies, without deleting the stream. Is it possible to do this with a command line application like ffmpeg? I have a bunch of video files that were ...
2
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1answer
326 views

Adding image to a video file using ffmpeg

I have created a OGG file from a stream of jpegs using fmpeg within a c# application. I would like to know if it is possible to add an image (of same size and resolution) at a later date to this ogg ...
2
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0answers
24 views

ffmpeg reducing 60fps to 30fps, but file size is larger

I just did: ffmpeg -i inputfile -r 30 -vcodec libx264 -an -s hd480 output_30.mp4 and ffmpeg -i inputfile -vcodec libx264 -an -s hd480 output_60.mp4 on a 60fps file. Why is the second file 27 MB ...
2
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0answers
21 views

Video transitions and filters - how to create custom ones?

I am wondering if there is a possibility to do custom video transitions or filters. Like the video spiraling out, little squares appearing, circling out or something like that. Wiping the video out ...
2
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0answers
33 views

FFmpeg pan filter and clipping

I have a file that has one video stream and one audio stream with 8 channels. I want to create a new file that will only contain the first 2 channels of the audio stream (no video). I can do this ...
2
votes
1answer
136 views

Is it possible to merge two or more videos in real-time like this?

Is it possible to play video online that's made of two or more video files? Here's what I mean. My site is hosted on Linux/Apache/PHP server. I have video files in FLV/F4V format. I can also convert ...
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0answers
145 views

How to display static image if the input stream ends using ffmpeg?

I am receiving a stream over the network with the following ffmpeg command: ffmpeg -i rtmp://server:port/input.stream -f flv rtmp://server2:port/output.stream When the input stream stalls, I want ...
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1answer
239 views

Unable to concatenate videos due to identical MOOV atoms

I am cutting out segments from a long mp4 file and then rejoining parts of them. However, since FFMPEG apparently keeps the same MOOV atom for the trimmed files as the original, it looks to FFMPEG ...
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0answers
104 views

segment does not contain sync frame

Whenever I split a video using Apple's mediafilesegmenter, using the following command: medifilesegmenter video.ts -t 10. I get the following error for each segment except the first: segment does not ...
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2answers
360 views

Why does quality degrade so much if just cutting video with ffmpeg?

I have tried to cut video with the following command ffmpeg -i "Вспомнить все (Total Recall, 1990).avi" -ss 01:07:29 -to 01:08:05 fight.avi Output: Input #0, avi, from '╨Т╤Б╨┐╨╛╨╝╨╜╨╕╤В╤М ╨▓╤Б╨╡ ...
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2answers
614 views

YouTube 3gp encoding settings

I'm building a new media site and I'm taking cues from YouTube for which video file formats I should offer for widespread usability among mobile and desktop clients. I'm doing all transcoding using ...
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1answer
466 views

How to extract MOOV atom/metadata from MP4 file?

Can one "dump"/extract the MOOV atom from an MP4 file? If so, how? Hoping for an obscure FFMPEG command. I need to be able to process/play a stream without searching for the MOOV atom over and over ...
1
vote
1answer
804 views

Crop video in ffmpeg without re-encoding

I have videos I want to split across multiple screens, so the solution I've found so far is to just crop the input video 4 times with ffmpeg (is this optimal? Is there some other way so I only need to ...
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2answers
527 views

Lossless conversion of yuv420p10le to yuv420p

I have an mp4 movie, containing an h264 video stream (pixel format yuv420p10le), and an AAC audio stream. My favorite player cannot read the yuv420p10le pixel format. I was wondering if it is ...
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2answers
5k views

How do I recover truncated AVI/DV video?

Short version: I believe I have truncated but otherwise valid AVI/DV files that won't play in any player I've tried (Adobe Premiere, MPC HC, VLC). I assume the stream data is intact but truncated, and ...
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2answers
172 views

ffmpeg: mute first 2 seconds in all audio streams

Looking to edit a blip out of the beginning of a video/audio file: How can I use ffmpeg to only edit the first two seconds of the clip so that there's no longer that blip in the audio? How do I ...
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1answer
167 views

How to get FFMPEG output the same quality as Vimeo?

I like Vimeo, but I rather host a player and video myself. So I was wondering if someone knows how to get the closest result to Vimeo quality, but from FFMPEG? It seems that Vimeo uses 1280 pixels ...
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1answer
74 views

Is H.264 subject to exploits / are some H.264 codecs subject to exploits?

How safe are H.264 streams from exploits? More exactly, are the consumer-grade H.264 codes generally "safe"? I am currently gratuitously transcoding A/V files to avoid being exposed to possible ...
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3answers
439 views

Using ffmpeg to cut out a scene by original timestamp

I have a recording (a simple, unprocessed TS from my satellite receiver, not encrypted) that has uneccessary stuff at the beginning and the ending. I want to cut out the main feature now with ffmpeg. ...
1
vote
1answer
265 views

using a 265 encoded video with a container

Let me start by saying im not a video production guy. I am a programmer so im in over my head in certain areas. Ive been trying to use ffmpeg to mess around with HEVC encoded video. I was told it ...
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2answers
163 views

FFmpeg encod set of time stamped images as Iframes

I have a set of images that are in time stamped order ( the unit is seconds ) but not in a set interval 012.png 017.png 024.png etc. How can I encode them so that each image is an Iframe at that ...
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1answer
286 views

How can I convert large jpgs (15000 x 10840px) to video?

Whenever I try the command ffmpeg -y -r 1 -i File01.jpg -c:v libx264 -tune stillimage -pix_fmt yuv420p out.mp4 I get the failing result: [swcaler @ 000000000347fe0] deprecated pixel format used, ...
1
vote
1answer
665 views

How to concatenate two mxf files with ffmpeg, preserving both audio channels?

I have mxf files which went over the 2G limit, so were split up in the camera to produce two mxf files. They have two audio streams, one from each mic, like this: Duration: 00:10:01.60, start: ...
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1answer
150 views

How to convert video for viewing on Sony Ericsson C702?

I'd like to convert some of my videos for viewing them on Sony Ericsson C702 cell phone. But I couldn't find the right set of parameters (a/v codecs, container, etc.). I'd prefer a solution using ...
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1answer
20 views

ffmpeg multi quality conversion?

is there any way in a one line of command i convert mp4 file to ts ,but with 3 different quality as output files ? for example 480p 720p 1080p ? Regards,
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1answer
57 views

ffmpeg stream options for mp3, cover art of mp4

I have potentially millions of HLS streaming videos to create from cover art and mp3s. Obviously, I'd like to keep the resulting bandwidth to a minimum. I tried various ffmpeg flags specifically ...
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1answer
191 views

FFMPEG: Why does the concat filter cause loss of a/v sync/lipsync?

I am doing some tests with the FFMPEG concat filter (DASH experiments), and am seeing that I start losing lipsync after a few concatenations. Is it expected that one can concatenate independent ...
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1answer
39 views

What means “Data: Skeleton” in an .ogv file?

My Question: I made a screencast with recordmydesktop (Version 0.3.8.1). When I investigate the rendered file with avprobe I see, that there is Stream #0.0: Data: skeleton in the produced file. I ...
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1answer
291 views

Correct lens distortion with ffmpeg

It seems to be possible to correct lens distortion with ffmpeg. According to the manual you can adjust K1 and K2 values. What this means? How to use it correctly? Example still image - captured with ...
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1answer
85 views

What parameters should I select to get a high quality voice .wav file?

I'm trying to generate a high quality .wav voice-over using Microsoft Speech API. What should be the values of following parameters (they are part of this constructor): int samplesPerSecond, int ...
1
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2answers
258 views

ffmpeg re-encode libx264 without quailty loss?

According to the documentation for libx264 (h264) encoding, we can use a preset of veryfast, faster, fast, medium, slow, etc. https://trac.ffmpeg.org/wiki/Encode/H.264 ...for constant quality ...
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1answer
3k views

FFMPEG convert video with multiple audio streams?

Ok so I have a video made from dxtory. The video is using dxtory video codec and unknown audio codec. When I pop the file into avimux, I can clearly see two audio tracks/sources. I have successfully ...
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1answer
148 views

FFmpeg clarification “position of frame”

Sample output [Parsed_showinfo_0 @ 0x7f9a3b600000] n:0 pts:0 pts_time:0 pos:194408 fmt:yuvj420p sar:0/1 s:1920x1080 i:P iskey:1 type:I checksum:072007CF plane_checksum:[AAFB805D 153EE2B8 65C9A49C] ...
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2answers
472 views

ffprobe - why total bitrate is greater than sum of video and audio bitrates?

I have been working on video conversion. So, to find out video parameters I used ffprobe. However, when I run the command on an mp4 video file, I observe this: Total bitrate: 3547 Kb/s Video ...