FFMPEG QUESTIONS

I hope this helps . I'm using ffmpeg within a Python script (using mmpeg-python) in order to change metadata values but the bitrates and file size are also changed in the resulting video (bitrates are 'Velocidad de datos' and 'Velocidad de bits', sor

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I hope this helps . h264_nvenc uses the NVidia hardware assisted H.264 video encoder. libx264 is a software (CPU) based H.264 encoder.I would guess that libx264 delivers better quality than h264_nvenc for the same bitrate.

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seems to work fine has_b_franes in general indicates whether there's video delay i.e. is the frame presented in same order as decoding. The actual attribute being referenced depends on the specific bitstream format. For H264, it's the maximum expecte

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I hope this helps you . Try having ffmpeg directly operate on the input/output files, instead of piping data into and out of ffmpeg:ffmpeg -i INPUT_FILE.FLV -vn -acodec pcm_s16le -ar 16000 -ac 1 -f wav OUTPUT_FILE.WAV

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seems to work fine No, it isn't possible using ffmpeg to encode a video in reverse without dumping it to images and then back again. There are a number of guides available online to show you how to do it, notably: http://ubuntuforums.org/showthread.p

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may help you . EXT-X-KEY:METHOD=AES-128,URI="https://cloudflare2.jove.com/CDNSource/hls/59612/59612.key"

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this will help The normal image2 muxer expects to write to one or more image files. Use the image2pipe muxer.

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it helps some times You must modify the playlist and set a EXT-X-DISCONTINUITY after the broken file.

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around this issue In order to join some video clip(720x480 [SAR 8:9 DAR 4:3]) and leave two seconds blank gap between each one, i try to make an blank clip by code , Set the SAR during creation.

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I hope this helps . i want to change the background color of a movie while using tpad and adelay commands. it is now black ( until the movie starts). , Use the color option for tpad.tpad=start_duration=5:color=blue.

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To fix the issue you can do Remember that codecview will display the motion vectors from the encoded file, so if you denoise that file after decoding (such as ffplay [..] -vf hqdn3d), then the motion vectors aren't actually affected by the denoising,

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Hope this helps Okay I fixed it already by doing the following instead of -vf ... :-filter_complex "subtitles='[X] File - 1 [Y].mkv'"

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hop of those help? Useffmpeg.exe -i 1.mov -i 2.mov -f lavfi -t 1 -i anullsrc -filter_complex "[0:v]scale=1920:1080[v0];[1:v]scale=1920:1080[v1];[v0][2:a][v1][1:a] concat=n=2:v=1:a=1[v][a]" -map "[v]" -map "[a]" out.mp4

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hop of those help? P frame does not depend on previous P frame, it depends on previous picture. So, for example, if you have IPP, you need both I and second P to use the third P, not just the second P.decode_video2 does the interpolation for you and

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I wish this help you FFmpeg, by default, suppresses looping of GIFs but you can disable that behaviour.

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around this issue Try adding -fflags nobuffer -flags low_delay -strict experimental before -i. you may see few currupted frames at the beginning since there is no reference frame.

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hop of those help? Don't worry you've got an x86_64 ffmpeg. The mentioned message is normal for x86_64 compilation as ffmpeg configure combines all x86 architectures in one 'x86' arch:

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fixed the issue. Will look into that further Add the -b:v option per output with the appropriate stream specifiers like your other options. The resulting BANDWIDTH values will change accordingly.Other stuff:

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seems to work fine The question is if I could always use this idea to produce html5 compatible video

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I wish this helpful for you You need change VideoStreamDecoder class:First you need to configurate your AVCodecContext with using HWDevice of your machine. Something like this:

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Does that help Encoding EIA-608 captions into the video file has been an outstanding feature request for some time. There is currently an open issue for adding support to ffmpeg and it has not yet been addressed.This request comes up on mailings list

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Hope that helps The m4a is a MPEG-4 Part 14 (MP4) container and not raw AAC and might require seeking. You might be able to pipe it if the moov atom is placed at the beginning of the file (ie. when using faststart) but you're better off with the inpu

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should help you out The concat filter is complaining about the mismatch in resolutions between the two videos. Resize one of them to the size of the other.Below, I rescale and pad the intro to the size of the main video.

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I wish did fix the issue. I have bunch of images that i have to convert to slideshow with curtain effect. currently i am running this command that convert images to video.

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around this issue You need to send SPS/PPS data periodically if you want to have random access. If you don't, this data will only get send in the very beginning. This information is critical for decoding a H.264 stream. Consider adding h264parse befo

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