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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9 views

How to fix the difference between duration of ffmpeg input and output?

I am trying to generate a video from a bunch of png images and audio using the command: /usr/bin/ffmpeg -y -framerate 30 -pattern_type glob -i 'images/*.png' -i audio.wav -c:v libx264 -b:v 0 -crf 18 -...
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Unable to get video output using Dazzle DVC100

I'm trying to digitize old videos from a SONY DCR TRV-120E reading hi8 PAL tapes. I'm using a component output (I've tested the ouput with a TV and it works fine) I'm using the Dazzle DVC100 Adaptor. ...
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H264 Concatenation Works with FFmpeg but not Other Muxers

I have an original H.264/AVC video created by my phone: $ ffprobe -hide_banner -i vid1.mp4 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid1.mp4': Metadata: major_brand : mp42 minor_version ...
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How to Create Compatible AVC Video for Muxing Without Re-encode

I want to encode a video that will be compatible with videos created by my phone. That way I can mux the new video with the original without re-encoding the original video. I use FFmpeg with the ...
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FFmpeg/nvenc(cuda): Where is the documentation for h264_nvenc encoder?

I'm trying to use Nvidia's h264_nvenc video encoder with ffmpeg but I can't find a single source of documentation for it. I want to know what options are supported and what they do. The software ...
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13 views

What is the best deblock value? How to preserve more details?

What is best deblock value for encoding hevc how can I preserve more details? And my other question İs -1,-1 better than -3,-3? I don't understand the value. if someone could explain I would be ...
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What value should bufsize be if maxrate is 3700?

What value would be the best if maxrate is 3700? which would be better if set it to 3700 or 4600 or 7000? I dont understand the value. İf someone could explain I would be appreciated
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What actually happens to footage that is upscaled or downscaled?

I was wondering if there was any hard number evidence for upscaling or downscaling footage to a certain raster size, and what happens to the quality or if any degradation or improvements are made to ...
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33 views

Which rate control algorithm best preserves quick movement?

I gathered the following rate control algorithms are commonly used when encoding modern video formats like h264, HEVC or VP9. With a constant quantizer (-qp in terms of ffmpeg) all frames are encoded ...
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How can I remove ENCODE İNFORMATİON from mediainfo for H265 HEVC .mkv?

I want to know how I can remove encode settings from the mediainfo with mkvpropedit or ffmpeg? İn this post: Removing MP4 encoding information I found this command: ffmpeg -i INPUT -c copy -bitexact -...
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I used ffmpeg to concatenate to videos and it got stuck and produced a huge file. Where is the mistake?

I have this short videoclips that i recorded either with my webcam or with my phone. The ones that come from my webcam are in Matroska container, and the ones from the phone in mp4. Each piece is ...
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FFMPEG: cut clips from a long video with “fast seek” while maintaining accuracy

I have this 3 hour long video which consists of: < 1-5 seconds of black frames > -- < clip > -- < 1-5 seconds of black frames > -- < clip > -- ... I could successfully get the ...
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What exactly is a “sample” in audio/video context?

I'm studying on video processing/encoding and doing so I started looking source code of some popular related tools. And all of them has some reference to "Sample" For example an arbitrary ...
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Resuming a partially-completed encode with FFmpeg

Summary Given a partially completed encode that: Was encoded using h264 in the Matroska container Was cut short by manually stopping FFmpeg by typing 'q' in the console ...what are the ways to ...
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vlc file format encoding issues

I am trying to figure out how to convert video and audio format with VLC. I'm trying to convert a 64 kbps mp3 to a 64 kbps ogg. The UI for encoding gives the options for audio as the following: ...
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Build FFmpeg with “.EXE” files of external libraries?

this is my first question on StackExchange! I recently got into building FFmpeg on Windows and build successfully the vanilla and the external library versions of this program! I noticed that it only ...
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1answer
41 views

Best export settings for still image with audio

Suppose I have a sequence in Premiere which is an audio track accompanied by a single still non-moving image (e.g. a song and the album art). Being that there is no video (or motion of any kind), what ...
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33 views

Stream video using FFmpeg with minimum writes reads to disk

We are streaming a video using a 30 instances of docker containers hosted on Azure each instance running FFmpeg. The problem is that Azure limits the reads/writes that a container can do. Is there a ...
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79 views

compare two video then cut the different

I have 2 video files with the same content, but coming from a different source. They have a slight difference in 'cut' and language dubbing, meaning one can be missing a shot compared to the other. I ...
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Script works on some files in batch but not others, any advice?

I'm trying to convert a batch of (mostly) .mxf files (4 channels of audio) to .mp4 files (stereo audio) taking the first two channels from the source using the following script: #!/bin/zsh for i in *....
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Final cut pro export file size is huge (despite the small size of the initial video) - how can I shrink it?

I'm a complete novice at final cut. I have recorded a dnd game over zoom, it's a 2 hour video, the file saved from zoom is 756mb. I have edited it a bit (just minor stuff, add a couple of images, ...
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ffmpeg - Slow down video and loop/repeat audio

I am trying to use ffmpeg to slow down a video speed by 25% (75% speed) without changing the audio speed. ffmpeg -i input_video.mkv -filter:v "setpts=1.3*PTS" "SlowVideo25.mp4" On ...
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Is there a hardware acceleration for audio encoding?

Video encoding with HW acceleration takes way less time than audio encoding. Is there a way to convert ac3 to aac faster?
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Do modern devices support decoding 4:4:4 pixel formats?

I am recording and distributing relatively low motion screen content (not games). Using h264, fine text often appears very blurry due to the poor subsampling with 4:2:0 and 4:2:2 pixel formats. With 4:...
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Hevc Transparent Channel? (Apple WWDC19)

So, Up until now, HEVC Supported Transparent. But there wasn't any encoding Software To Encode that Transparent Pixels in it. Until Apple made their Own Way of Putting Alpha pixels inside a consumer ...
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Trim Audio Only of a Video file - FFMPEG

I have a mkv file containing a Video 1 minute shorter than audio. I want to Cut out first 1 Minute of Audio Stream. How Would I accomplish That With ffmpeg? I tried -ss 00:01:00.000, But that also ...
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169 views

Does HEVC Support 16-Bit RGB Color Format?

I have some 3D Rendered Frames in 16-bit rgba Color Format.... I don't Wanna Lose Any Data... Because I have to Use those in editing.... But With Thousands of Frames in 4K File Size Matters.... So Why ...
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67 views

Scale Video, Without 'ffmpeg Scaler' converting colorspace from RGBA to YUV

I have a video in RGBA space contained in MPNG codec. Which is in 4K. I need to Convert that into a 1080p File... SO i Used this - ffmpeg -i input.mkv -vcodec libx265 -vf scale=1920:1080 -sws_flags ...
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severe artifacts pixelation when using cuda rendering premiere pro

In premiere pro when I set the renderer to GPU Acceleration (CUDA), for the timeline and on media encoder export, half the video is completely messed up with lots of pixelation artifacts when I switch ...
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What SOFTWARE could I use to encode to this spec?

Thanks in advance! It's an mpeg transport stream in a .ts wrapper. Layout would be as follows: Video (MPEG2, 80Mbps, CBR, All I Frame,422@HL) Audio1 (Track1/PID1) 1 pair LPCM(SMPTE 302M)48kHz Audio2 ...
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ffmpeg 4.2.3 error, Could not find codec parameters for stream 4 (Unknown: none): unknown codec:

ffmpeg 4.2.3 error, Could not find codec parameters for stream 4 (Unknown: none): unknown codec: This error is for gopro videofiles, where they can processed very fine with different ffmpeg command......
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How to change orientation 180 degrees to only two videofiles out of multiple, with compression to happen only once?

How to merge with ffmpeg multiple action camera (gopro) video files (eg. 30+) into one, and change the orientation 180 degrees to only two of these video files with encoding / compression to happen ...
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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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What is video hinting?

I've just faced with such thing as hinting videos. Quick research showed me something about the fact that it makes "streaming better" and something about QuickTime Streaming Server. That wasn't really ...
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1answer
121 views

How to H.265 to H.264 without losing quality

I have a MPEG-H Part2/HVEC (H.265) .mkv file (Planar 4:2:0 YUV 10-bit LE). Since my LG PF 1500 beamer does not read H.265 but H.264 I would like to convert it (HVEC -> H.264). I think handbrake is a ...
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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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48 views

ffmpeg log missing “dup” and “drop” key-value pairs

For some reason, my ffmpeg output log does not show dup and drop key-value pairs. expect: ... frame=563 fps=138 q=23.0 size=13056kB time=00:00:09.42 bitrate=11346.8kbits/s dup=0 drop=0 speed= 2.3x .....
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251 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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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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Encode a small proxy file with multiple audio streams for editing on Linux

After capturing 2K video in 444p with OBS, I need to transcode it to a low quality proxy version that's still easy to scrub and not a huge file. I capture 3 audio tracks in 32-bit PCM and the image ...
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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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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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34 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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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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ffmpeg rtmp server connection issues

I am trying to stream using ffmpeg rtmp using, ffmpeg -i out2.mp4 -c:v copy -c:a aac -listen 1 -ar 44100 -ab 64000 -f flv rtmp://localhost/live The process starts but nothing is happening after ...
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34 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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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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137 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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46 views

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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181 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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