Questions tagged [encoding]

The process and techniques used when storing moving images, sound, metadata and other streams as a digital file.

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converting video to m1v

I am having an issue with converting a 1920x1080 video to m1v format. In the past I have used XMediaRecode for the task, but for some reason there is a persistent bug which prevents me from changing ...
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9 views

Post-production editing audio/video out of sync

I am trying to add two videos using ffmpeg and the output video/audio is out of sync (and fast forwarded). Goal is to put intro.mp4 before the original file clip.flv My approach is to Change the ...
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146 views

FFMPEG: is it possible to offset output frames from a selection of specific frames?

I'm doing some ffmpeg (4.1.3) transcodings by extracting specific frames from the source, in this case, the source can be either a movie or an image sequence, all working fine with the following ...
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20 views

FFmpeg merge two files from different sources with different bitrates

I have created an intro video with Adobe Premiere Pro and I want to add the intro video to my downloaded Mixer stream videos before uploading them to YouTube, without reencoding the complete video ...
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ffmpeg pad and rotate - colour differential on upload to youtube

I'm using ffmpeg to rotate a square video to the desired angle, and then pad it from 1250x1250 to 2300 x 1293 (16:9). I use the following set of commands: ffmpeg -i input.mp4 -vf "rotate=-74*PI/180" ...
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114 views

Another question on Non-monotonous DTS in output stream

I use ffmpeg to convert and join multiple mp3 files into m4a. BITRATE=128k find . -name "*.mp3" | parallel --lb -k "ffmpeg -y -i {} -map 0:a -c:a aac -b:a $BITRATE {.}.m4a" OUT_NAME=${OUT_NAME:=out....
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29 views

How to export a video that is playable in WhatsApp?

I'm editing a video and want it to be playable inside WhatsApp. I've tried some configurations but when I send the video as a WhatsApp message, it always goes as an annexed document. The user can ...
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23 views

Editing issues with variable framerate input footage (Whatsapp videos)

I have to make a video for social media, mixing several short clips which have been sent to me via Whatsapp. I'm using Da Vinci Resolve 16. When taking the videos into the timeline, I get several ...
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29 views

Extending the length of a video and overlaying an alpha PNG image sequence using FFMPEG

I’ve got several videos to which I’d like to add ‘outro’ animations to, using FFMPEG. The outro animation itself is a sequence of 41 frames of alpha PNG images named consecutively, from Outro.00000....
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51 views

What does “top coded first (swapped)” mean in ffmpeg output?

I am attempting to convert a 1080i top first H.264 video to another with interlacing maintained. But when I look at the output, after setting these flags: -top 1 -flags +ildct+ilme -x264-params ...
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115 views

VMAF wrong results using SVT-AV1 encoder

I have a source video (source.mkv, which is a 25fps 1080p x264 encoded video), and I have reencoded it using SVT-AV1, like this: ffmpeg -i source.mkv -nostdin -f rawvideo -pix_fmt yuv420p - | ...
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Delta encoding for video files?

I have a very high quality video and I need to produce a high quality and a low quality version for transport into other systems. For the high quality version I use a lossy compression (currently ...
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125 views

What is the practical effect of x265 HEVC -tune fastdecode (vs. x264 without fastdecode)?

I have some still shots from a security camera. I want to reduce the archive size while keeping the details. I use -qb for encoding rather than -crf because -crf blurs the moving objects. I am ...
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ffmpeg adds two seconds of unwanted silence at end of video [duplicate]

I am creating a video file from a single image, and audio. Though, after running conversion the resulting video file is the audio track's length, plus two seconds. The audio codec does not affect ...
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Convert mp4 for different resolutions for playing using his

How do I transcode my mp4 video to different resolutions and create m3u8 for all for adaptive streaming
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91 views

How to configure B-frames (with no leading P-frames) in x265

I have been rolling around with my studies in x265 encoder for days by following this online x265 docs and this article. But I cannot figure out how to set the x265 encoder to code only I- and B-...
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890 views

Is there a way to improve h264_nvenc output quality?

I'm compressing some videos for archiving, and I came to this configuration which gives me a nice overall quality on a small size: ffmpeg -threads 4 -y -hide_banner -i input.mp4 -vf scale=-2:480 -c:v ...
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How to split an mp4 into original ts segments?

I have a *.mp4 file that was concatenated from a bunch of improperly ordered *.ts files. I'd like to extract original segments from the *.mp4 without encoding and manual cuts. Is it possible and if so,...
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Can I make m4v files “better” before archiving? (adding keyframes, or lossless optimization, or ?) [closed]

I've got a decent bitrate DVD rip of an animated TV series, and before sending it to it's forever home (currently my PS3's extra HD space), I was wondering: can you take existing m4v files and make ...
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146 views

Online VPS or Dedicated, Seedbox Video Encoding Help

I have a few questions. When I was younger I use to encode lots of old Animes for fansub teams and do Karaokes on my PC. My PC is currently out dated and do not have the space nor the power to do my ...
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85 views

Issues with transcoding to a MXF container

I'm new here, so hi to all :). I'm new to FFmpeg too, and I'm trying to transcode a HEVC file to a mxf file and I'm having some issues. The original file is a rip I made from a Bluray HDR movie a ...
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25 views

merging videos results in a messed up output

I'm trying to merge 2 videos with the same resolution and codecs but on the merged output only the first part (first video) works correctly and as soon as it ends there's a static image of the ending ...
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56 views

Can I manually delete frames from a video file like mkv/mp4 without using any video editor?

If I have a video file from which I want to delete/jump/skip a certain scene... Can this be done manually? I mean I know there are a ton of software (both FOSS & proprietary) which can achieve ...
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Real time H.264 streaming - sender to receiver

Trying to get H.264 to stream real time from one point to another point (i.e. single sender and single receiver). Is there an easy proof of concept to do this using ffmpeg. Tried multiple player ...
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45 views

x264 Downsides of a high CRF (22) intermediary codec between conversions instead of lossless

I have a huge collection of video files that are in the range of CRF 16-20 taking up TB's of space. The only need I have for these originals is that I have to encode them from time to time but the CRF ...
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388 views

How to decrypt video using ffmpeg?

I've managed to encrypt my video files using the ffmpeg command below however I can't find a way to save the decrypted output. ffmpeg -i {file} -encryption_scheme cenc-aes-ctr -encryption_key {key} -...
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60 views

PTS DTS indicator in PES frame

I'm trying to add timed metadata into TS files and to the best of my knowledge it is only possible if the PES frame has the PTS DTS indicator with the value 2, which means that only PTS is present. ...
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105 views

How to fix Encoding Overloaded in OBS Studio?

I want to record a programming tutorial with OBS Studio in 1080p 30FPS. I have never changed the encoder, the output format is MP4. Although my computer has very good hardware, I get Encoding ...
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67 views

No Maximum Bitrate H264 codec

I am trying to export a video with a low bitrate. Regardless of what I set as the target bitrate, the video always is exported with the highest possible bitrate. This occurs whether I use VBR or CBR. ...
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FFMPEG garbled video download

I've downloaded a video using FFMPEG. The logs are here. Here's the first 10 minutes of the video that FFMPEG downloaded. As one can see, video is all garbled up. And there seems to be no audio. ...
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1answer
72 views

Can you encode intra-frame videos from inter-frame without loss?

I'm aware of the differences between intra and inter, but I'm not the most savvy about reencoding them after the fact. Is encoding with intra from an inter-coded video the same as if you originally ...
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1answer
602 views

How to use hardware acceleration with FFMPEG for trimming and concatenation purposes

I am running FFMPEG on a Windows 10 (64-bit) laptop with Intel i3 (6th generation) processor and AMD R5 M430 GPU. I shot many videos on a recent trip. Cumulatively, they are over 100 hours long. Each ...
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390 views

FFmpeg 2017 vs 2019 decoding performance improvement

I was trying to do some basic profiling on ffmpeg, following my previous question here. I have a relatively high-bitrate .ts file (17mbps), and I have two versions of ffmpeg (2017.3 and 2019.4), and ...
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2k views

How to generate decryption key from m3u8 manifest? (OR) How to decrypt an excrypted MP4 using URI and IV?

I am downloading an HLS video which is AES-128 encrypted. The issue is that the downloaded video is also encrypted and hence, not viewable. The website is serving 2 M3U8 manifests: The first ...
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260 views

FFMPEG - Nero and Quicktime Format Chapters

Ok, I'm usually really good at finding the answers to my FFMPEG questions myself but I'm a bit stumped. I've got this file, an MP4, here is part of the MediaInfo: Menu 00:00:00.000 ...
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196 views

How can I change/reduce the bitrate of AVI files using Adobe Premiere Pro CC or other tools?

I'm using Eprime and Experiment Builder which requires files in AVI format (AVI-XVid). The files are quite small already (various 2 second clips under 1mb), but are still too large which crash the ...
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388 views

FFmpeg Throws Errors When Converting 7.1 TrueHD (Blu-ray Audio) To PCM Or FLAC

I have attempted to convert a TrueHD stream to PCM as well as FLAC. Throughout the encoding process, errors occur: "lossless check failed" and others. The same set of errors occurred when converting ...
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294 views

FFmpeg loop filter doesn't work

This is a follow-up from my previous question here. Basically, I'm trying to use FFmpeg's loop filter to freeze some frames and insert black frames. It's very weird; I swear it was working a few days ...
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1answer
471 views

Where are the Source Scaling Options in Adobe Media Encoder CS6?

In Adobe Media encoder CC, the Settings in the drop-down menu have a Match Source option that will preserve the pixel size of the file. In this Adobe Help article, the authors of the page state that ...
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470 views

Fast VP9 still image encoding

I use this command to create "myFile.webm", a VP9 video with one still image : $ ffmpeg -i myOriginialPureAudioFile.opus -loop 1 -i myAudioFile_640x360.png -shortest -threads 4 -speed max -c:a copy ...
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587 views

FFmpeg for m2t and Sony Bravia - not working

-f mp4 -c:v libx264 -preset veryslow -tune grain -profile:v high422 -flags +ildct+ilme I am preparing video to be streamed (DLNA) from my NAS to an older Sony Bravia. I have successfully created ...
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1k views

Is it possible to use 2-pass encoding to create vp9 / webm videos from an image sequence?

I'm currently creating webm videos using ffmpeg to encode an image sequence. My command is: ffmpeg -framerate 30 -f image2 -i frames/%04d.png -i my_audio.flac -c:v libvpx-vp9 -pix_fmt yuva420p -b:v 0 -...
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If I encode a video above source and then later do a final encode, will I lose extra quality vs the final encode directly?

I am very happy with my Handbrake settings for my final encodes but I have a video that needs to be edited first. I intend to use Vegas Pro to do this but the default encoding settings create terribly ...
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927 views

Replacing I-frames in h265 stream

I'm trying to follow this tutorial: https://www.reddit.com/r/brokenanimegifs/wiki/tutorial Everything works perfectly. On the basis of this tutorial, I even created my own little tool. It just ...
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3k views

How do I avoid objects having flickering edges when I encode a screen recording to mp4 using x264 and ffmpeg?

The Goal I'm creating short tutorials by recording my screen (720p30fps). The content is just a recording of using some desktop software - so mouse moving and opening dialogs, typing, drawing shapes, ...
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1k views

H264 Remove Encoding Settings - Error FFMPEG

" Removing MP4 encoding information " I have tried the formula of interpretation but I have compared it with such an error. " Unknown bitstream filter h264_changesps " What am I supposed to do?
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55 views

Why can't modern video cameras be used for live streaming without a capture card?

I'm just curious what the physical limitation is now-a-days that connectors like USB-C and thunderbolt exist. In the past I thought the issue was that the encodings that video cameras put out (...
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1answer
895 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 ...
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54 views

Converting 1080i5994 DNxHD HQ to 1080p

I recorded some long format talks in 1080i5994 DNxHD via my atomos recorder. I do this all the time and never have any issues. I record in that format because thats what my switcher puts out and it ...
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How does the source encoding reflect the settings used to export?

I filmed Video during Christmas with my Canon 5D mark II. My input source is H.264/MPEG-4 (Base Profile @ L5) from my camera. I have edited the movie and just want to save it to the hard drive for ...

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