All Questions
199
questions
0
votes
1
answer
43
views
FFMPEG cant render from transparent webm a transparent png frame
I want export every frame like original source, in webm video is alpha/transparent video track, and if I try export with my base command will export with black background.
ffmpeg \
-hide_banner \
-...
1
vote
0
answers
103
views
How to preserve contrast/highlights when converting ProRes HDR 10-bit to SDR using hevc_videotoolbox?
I'm trying to convert a 4K HDR 10-bit video clip to BT.709, preserving as much color as possible while allowing the clip to be played where HDR is not supported.
With the command below, the output is ...
- 21
2
votes
0
answers
66
views
How to know my audio codec will support the output container in. Fluent-ffmpeg [closed]
I am building a YouTube downloader. As YouTube doesn’t store high quality video with audio and store them separately so I have to merge them on server.
For merging I am using a Node.js server with ...
- 21
1
vote
0
answers
2k
views
FFmpeg Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input
I'm having trouble using FFmpeg to host an RTSP server for continuous video streaming. The command I'm using is:
ffmpeg -report -v verbose -re -stream_loop -1 -i store-aisle-detection.mp4 -c copy -f ...
2
votes
1
answer
969
views
Why does ffmpeg alter timestamps when "-codec copy" is given, and how to prevent this?
I am currently trying to remove certain audio tracks from a bunch of m2ts files (mainly to save space), using ffmpeg. In doing so, I would like the removal of those tracks to be the only action that ...
- 1,835
2
votes
0
answers
153
views
Video Encoded using FFmpeg is not being played in Azure Kinect Viewer
I captured a video using a Kinect Azure DK device and could play it back using Azure Kinect Viewer (v.1.4.1). However, when I encode a video using FFmpeg, the commands are given below. I can not ...
0
votes
0
answers
254
views
Best Lossless Video Codec for 8 bpc RGB image sequences?
I render 3D animations, many of which take days or even weeks to render at a time, and I need to keep a lossless archive of the output files. The output format from the render engine is 8 bit per ...
- 1,610
1
vote
0
answers
56
views
FFMPEG: Sync issue between mp3 and mp4 converted from the same input webm file
Using this command to create 2 files :
ffmpeg -y -i input.webm -c:v copy -c:a libmp3lame -b:a 128k -strict -2 -f mp4 rec_50ae1a2a3da64cf1a5f46c53de757d6e-1692704540213.mp4 -vn -acodec libmp3lame -b:a ...
- 11
7
votes
1
answer
12k
views
How to select maximum resolution and specify a format/codec in yt-dlp?
I use yt-dlp frequently and like it. But there is a problem I can't find documented anywhere.
yt-dlp -v -f "bv*[height<=720]+ba*[ext=m4a]" -N 4 "https://www.youtube.com/xxx"
...
- 165
1
vote
0
answers
236
views
Force media info rewrite with ffmpeg
I have a bunch of video files created by MKVToolnix that have a Codec ID like: V_MS/VFW/FOURCC / HEVC.
I tried to run this:
ffmpeg -i test.mkv -c copy test.avi
to turn it to avi and then this:
ffmpeg ...
- 11
2
votes
1
answer
2k
views
Is it okay to re-encode videos from traditional lossless codec to modern lossless codec to save space and preserve quality?
Lossless video codec means almost zero information loss. After some internet search I found that there are some traditional opensource lossless codec like huffyuv, lagarith, utvideo and ffv1, which ...
- 21
0
votes
0
answers
219
views
Official source for portable embedded Chromium binaries, for kiosk use, with H264 support
I am using Chromium in kiosk mode, for an embedded computer project.
We can find portable snapshots on https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Win_x64/
...
- 1,900
1
vote
1
answer
928
views
How do I accurately cut video and audio with ffmpeg
So when I try to cut out a portion of a video I do this
ffmpeg -i originalClip.mp4 -ss 00:00:14 -t 00:00:21 -codec copy outputClip.mp4
And the video comes out with amazing quality and the sound is on ...
- 111
3
votes
1
answer
1k
views
Kdenlive proxy clips vs. transcode to editor-friendly format
When should I use proxy clips vs. the "transcode to editor-friendly format" option? They both seem to accomplish the same goal, that is, providing the video in a format that the editor can ...
- 175
8
votes
2
answers
2k
views
FFmpeg incorrect colourspace with hardcoded subtitles
Problem
I have a MKV file which has 1 video and 1 subtitle stream, of which I want to hardcode the subtitle stream and output a MP4 file.
Example file, images and results can be found here.
mediainfo
...
- 305
2
votes
1
answer
2k
views
Only convert codecs(preserve audio and subtitles)
I have a video file h265 mkv which has dual audio and multiple subtitles.
I want to convert it to h264 since it doesn't require further transcoding on my jellyfin server.
But I haven't been able to ...
- 21
0
votes
0
answers
223
views
How to cut 1 video into many different videos with different lengths? ( FFMPEG)
I need to cut a video with a length of several minutes into many different videos, In all but the videos cut from the original video will have different short lengths. what do i need to do?
This is ...
- 145
0
votes
1
answer
59
views
Songs of Conquest can't play cutscenes after winning a mission on Ubuntu 18.04
Songs of Conquest can't play a cutscene / video after winning a mission in campaign on Ubuntu 18.04. After you win a mission, there should be a bard singing a song. The screen just stays black. How do ...
- 121
1
vote
0
answers
144
views
How to export mestimate filter motion vectors into a separate file with ffmpeg binary?
So mestimate filter can be used to compute the motion vectors in a video. They can also be displayed. Is there a way to export them into a separate file using the ffmpeg binary? I would love to have ...
- 121
0
votes
0
answers
970
views
Bitrate over Codec for the best quality?
AFAIK bitrate means how many bits are used to record the audio/video within one second, while codec (or file format) means the compression method to store the clip.
To me, the higher the bitrate, the ...
- 571
0
votes
0
answers
406
views
How to convert old videos to a new format that is playable in most modern browsers?
I found a stash of old video clips I'd like to share online with a HTML5-video player. But none of them opens in Chrome. I guess the codecs are not supported.
What format should I convert to? What is ...
- 209
1
vote
0
answers
394
views
Codec parameter is overridden by file extension when using ffmpeg
I'm using ffmpeg to transcode some video files and for this post we'll take test.mkv. test.mkv has an audio track at index 2 that is AAC 7.1. I want to keep the track but also add a AAC stereo version....
- 111
0
votes
0
answers
5k
views
Save a local file URL .m3u8 stream using youtube-dl
I have a local .m3u8 file containing stream information. I would like to use youtube-dl or a fork to download the stream.
When I pass the local file to youtube-dl it gives the error that it is ...
- 4,463
1
vote
0
answers
2k
views
Calculate PSNR, VMAF, SSIM using FFmpeg
I am trying to calculate PSNR, VMAF, SSIM using FFmpeg after I reencode to 10-bit H.265 codec but I keep getting an errors:
"An invalid or unaligned stack was encountered during an unwind ...
1
vote
1
answer
4k
views
Could not find tag for codec none in stream #1, codec not currently supported in container vs Non-monotonous DTS in output stream
I'm trying to record video from my ip camera stream with ffmpeg in command line.
fmpeg -rtsp_transport tcp \
> -i rtsp://192.168.0.250/stream1 \
> -c copy \
> -map 0 \
> -f segment \
&...
- 113
0
votes
1
answer
1k
views
How is this ffmpeg '-map' documentation? Okay?
Regarding ffmpeg: Attach various codecs to various filtergraph output streams -- How?
Is the following 100% correct?
There are 5 types of '-map's:
1, Input-absolute: index (i) all input streams (e.g. -...
- 21
0
votes
0
answers
632
views
2160p HEVC 4K video not playing
This video is not playing in pc
I have tried vlc 3.0016, Media Player classic and pot player but did not able to figure out the correct configuration to run the video.
Any suggestion of any other ...
0
votes
1
answer
567
views
Resize an MP4 with AAC/H.264 encoding in 16:9 to a smaller 16:9 file
I have a 1920x1080 (16:9) MP4 file with Codecs: AAC, H.264 that I would like to shrink to various smaller sizes, for example: 1280x720 or perhaps 640x360.
As far as I know, those values are clean 16:9 ...
- 103
0
votes
1
answer
4k
views
Range of "global_quality" value for h264_qsv encoder?
What is the range of the -global_quality setting for ffmpeg's h264_qsv encoder (4.3.2-2021-02-27-full_build-www.gyan.dev, Windows)?
Ffmpeg's documentation for the encoder (archive) states:
The ...
- 10.9k
0
votes
1
answer
9k
views
ffmpeg : Could not find codec parameters for stream 1 (Video: vp8, yuv420p): unspecified size?
I have an RTP stream coming from Kurento Media Server.
I would like to record this stream to a file using ffmpeg. I'm running the command
ffmpeg -protocol_whitelist file,crypto,udp,rtp -i a.sdp -c:v ...
- 109
1
vote
3
answers
1k
views
ffmpeg several streams with different video and audio setting using --filter_complex and tee pseudo muxer from same source
I'm capturing video with embeded audio from decklink mini recorder and need to create 6 different streams. I've created the filter for the video and it works, but cannot figure it out how to set ...
- 21
0
votes
0
answers
236
views
Vokoscreen VP9 Codec in Debian 10 Buster
Kdenlive for Debian Buster allows me to render using the VP8 and VP9 codecs. Also, I think Vokoscreen 3.0.8 for Win 10 allows me to record using VP9. Unfortunately, when I install Vokoscreen 2.5.0 ...
- 285
1
vote
1
answer
617
views
AV1 extract keyframes
Using this file [1], I can run this command with no problem:
ffmpeg -i crushed-between-two-portals.mp4 %d.jpg
but if I run either of these commands [2]:
ffmpeg -i crushed-between-two-portals.mp4 -vf &...
- 1
0
votes
1
answer
120
views
What is a MOJO codec and how can it be used with ffmpeg
NComputing VCast has this MOJO format that can play fast on their thin clients.
As described here: https://support.ncomputing.com/portal/en/kb/articles/vcast-what-is-the-difference-between-web-media-...
- 976
2
votes
0
answers
2k
views
Extract timestamp of I-frames of video using ffmpeg
If I understand correctly, I-frames are the frames that are unaltered during video compression. I want to extract the exact timestamps of these I-frames and save the output in a txt file. How do I do ...
- 121
1
vote
0
answers
2k
views
FFMPEG - Transcoding webm to mp4 - wrong duration
I have a webm file that I want to convert to a mp4 file.
The result is a mp4 file with a different duration than the webm (much longer).
Webm file (via WeTransfer, example.webm, 421kb)
About the ...
- 281
7
votes
2
answers
5k
views
What are the differences between the HuffYUV and ffvhuff codecs in FFmpeg?
Doing ffmpeg -codecs | grep -i huffyuv shows that my FFmpeg build supports three different versions of the HuffYUV lossless video codec:
DEVI.S ffvhuff Huffyuv FFmpeg variant
DEVI.S ...
- 13k
0
votes
1
answer
68
views
Join vides of different formats
I have a collection of videos that have been recorded and encoded with various different devices and codecs. I try to make one movie out of them. I thought it's a good idea to bring them all to the ...
- 316
2
votes
0
answers
388
views
Why has bitrate changed after remuxing with ffmpeg?
I am running this command to remux a .VOB file into a .mov file, without re-encoding.
ffmpeg -i input.VOB -c copy output.mov
The details of the movies' codec, framerate and bitrate in QuickTime's ...
- 21
0
votes
1
answer
215
views
Compressing video consisting mainly of text and still images (Powerpoint slides)
(NB This question is largely a duplicate of Best video codec for filmed powerpoint presentation but that question is 7 years old and I hope to see if there is new advice. I don't have enough ...
2
votes
2
answers
2k
views
Chrome video decoding GPU or CPU
If I watch a video on the internet in the chrome browser, and the video is encoded with H265 or VP9 (or the future AV1), and I have a Nvidia GPU (GTX 1080): Is the video decoding happening on the GPU ...
- 123
6
votes
1
answer
30k
views
H.264 video support in Chromium, missing codec?
Been using Chromium for a while, but it occurred to me that most video content does not work. YouTube does, but Vimeo does not, and most video streaming sites as well as random webpages with embedded ...
- 73
1
vote
1
answer
4k
views
Video-Codecs in Chromium missing
I use a Version 81.0.4032.0 (Entwickler-Build) (64-Bit) Chromium Browser on my Windows 10 computer.
On Facebook Videos and some Gifs are not running. So I opened the Console and found this logs:
...
- 11
0
votes
0
answers
9k
views
ffmpeg: Could not find codec parameters for stream 0 - Video: none (H265 / 0x35363248)
I am trying to find a way to concatenate videos I am getting from an NVR. To my understanding, the video is encoded with H265, but I am not able to find more information on the specific codec (...
- 31
2
votes
1
answer
3k
views
Compressing Grayscale 8-bit PNG Sequences with ffmpeg
I typically deal with many high-resolution PNG sequences, many of which are RGB (24-bit) or entirely grayscale (8-bit). Because adjacent frames in the sequences are very similar, it is important that ...
- 1,610
5
votes
2
answers
817
views
Do video containers affect video quality ? Or is it just the codec?
Do video or audio file containers (extensions) have any repercussion with the video in itself ? Or is the codec used the only thing that has a repercussion ?
For example I have the exact same video ...
- 707
0
votes
1
answer
2k
views
Extracting AAC LC audio from mp4 using ffmpeg
Here is the info of the file that I am working with
General
Format : MPEG-4
Format profile : Base Media
Codec ID ...
- 576
3
votes
1
answer
6k
views
Lossless Video Codec supporting Alpha Channels
Suppose I have a sequence of PNG image files which may or may not contain an alpha channel (assume those that do have an alpha channel actually utilize it). While PNG files themselves have their own ...
- 1,610
1
vote
1
answer
4k
views
VLC Playback Stutters with ProRes-encoded Video
I have a 4K 60fps 3.46 GB video file that was encoded from a lossless 8bpc RGB mov video file using the following ffmpeg settings:
ffmpeg -i 8bpcRGB.mov -c:v prores_ks -profile:v 2 -bits_per_mb 540 -...
- 1,610
0
votes
0
answers
435
views
How to extract an elementary video stream from Avigilon .ave container?
I would like to figure out how to extract a H.264 video stream from an Avigilon .ave custom container. Unlike with here where they are using ffmpeg to extract the elementary video stream, when I try ...
- 1,117