26 October

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 02:51
  ffmpeg: error while loading shared libraries: libopenh264.so.5 - ESZ Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg and getting this error ffmpeg: error while loading shared libraries: libopenh264.so.5: cannot open shared object file: No such file or directory I have already checked if the library exists and it does. I added it to /etc/ld.so.conf as mentioned in this previous question but it doesn't work.

25 October

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 23:12
  What ffmpeg arguments will approximate Zoom recording quality - Stan Ivanov Newest 'ffmpeg' Questions - Stack Overflow
  I've been recording screen sharing presentations using Quicktime on my Mac and it uses x264 format with ~60fps. The produced video file is with type MOV and around 2.2GB for 1 hour of presentation. I want to compress it using ffmpeg and I've been doing so using x264 as well. Here are my arguments: ffmpeg -i '$inputFile' -vcodec "libx264" -crf 32 -vf 'scale=$width:-2,fps=24' -c:a aac -b:a 128k -preset veryslow -profile:v high -tune stillimage -f mp4 '$outputFile' I rescale my video to 1600px width to save on space and I also convert the (...)
• 21:05
  IP camera turns off RTSP stream to ffmpeg client after 1/2 of camera's RTSP timeout setting, when transport is UDP - MAXdB Newest 'ffmpeg' Questions - Stack Overflow
  Capturing RTSP Motion JPEG stream from an IP camera with ffmpeg. ffmpeg -loglevel debug -i rtsp://192.168.1.100:554/videoinput_1/mjpeg_3/media.stm -an -codec copy -y test.avi On the IP camera, the RTSP Timeout has a setting valid 1 to 120. When the rtsp_transport is default (UDP), ffmpeg will terminate after half the camera's timeout setting. If the camera is set to RTSP Timeout = 30, then ffmpeg will quit after 15 seconds. If set to 120, ffmpeg will quit after 60 seconds. With ffmpeg loglevel set to debug, get "No more output streams to write to" message: No more (...)
• 20:38
  How to stream to multiple destinations with ffmpeg - Wilhelm Newest 'ffmpeg' Questions - Stack Overflow
  I want to stream my video to 4 destinations. My input signal needs to be recoded to "H.264 AAC", so I want to send it to my server. This works already. Client -> Server with ffmpeg -> Destinations Now I have a performance problem: One should get the stream in 1080p and two in 720p. So it would make sense to first get the stream in the desired formats H.264 1080p and AAC with 30 FPS and then calculate the stream once, send it 1:1 to the two HD targets. and create a 720p stream in parallel and send it to the two remaining destinations. What is the best way to do (...)
• 20:27
  ffmpeg is failed to concatanate two different resolution videos [duplicate] - Ramesh Jangama Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to cancatanate two differen resolution videos. I am getting below error which I am getting confused. However same command is working fine if I give same input file twice for concatation. command: ffmpeg -i C:\\Users\\oem\\Downloads\\FFMpeg_practice\\test4.mp4 -i C:\\Users\\oem\\Downloads\\FFMpeg_practice\\test_out3.mp4 -y -filter_complex "[0:v] scale=iw/2:ih/2 [v0];[1:v] scale=iw/2:ih/2 [v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1 [v][a]" -preset superfast -crf 30 -ab 64k -map [v] -map [a] C:\\Users\\oem\\Downloads\\FFMpeg_practice\\diffmerge.mp4 error: Stream specifier (...)
• 20:21
  How to encode audio once for multiple output videos with ffmpeg - Suuuehgi Newest 'ffmpeg' Questions - Stack Overflow
  I would like to create several output videos with different resolutions but the same audio. Afaik audio encoding is an output option. ffmpeg \\ -hwaccel qsv -c:v h264_qsv \\ -i \\ -filter_complex '[0:a]aformat=channel_layouts=stereo,aresample=async=1,asplit=3[a1][a2][a3];[0:v]vpp_qsv=detail=50:framerate=25,split=3[v1][v2][v3];[v2]vpp_qsv=width=1280[v2o];[v3]vpp_qsv=width=800[v3o]' \\ -c:v h264_qsv -c:a aac -b:a 96k -map '[v1]' -map '[a1]' \\ -c:v h264_qsv -c:a aac -b:a 96k -map '[v2o]' -map '[a2]' \\ -c:v (...)
• 17:53
  Cutting multiple videos with x amount of time from the end (ffmpeg?) - Jack Fitzpatrick Newest 'ffmpeg' Questions - Stack Overflow
  I have no history with ffmpeg, but I am assuming this would be the right tool for the job. I am trying to cut a folder of videos with different lengths. I want to cut them all to be 12 seconds from the end. That is: on a 30 second video I would be left with 00:18 - 00:30. 00:00-00:17 would be deleted. I am on mac OS Mojave. It seems that ffmpeg is the right tool for the job to batch edit these videos. Can someone walk me through this? I have some basic understanding but will need the code/script explained so that I can apply it to my own use. Thank you very (...)
• 16:56
  Lossless compression of a sequence of similar grayscale images - damien200 Newest 'ffmpeg' Questions - Stack Overflow
  I would like to have the best compression ratio of a sequence of similar grayscale images. I note that I need an absolute lossless solution (meaning I should be able to check it with an hash algorithm). What I tried I had the idea to convert my images into a video because there is a chronology between images. The encoding algorithm would compress using the fact that not all the scene change between 2 pictures. So I tried using ffmpeg but I had several problems due to sRGB -> YUV colorspace compression. I didn't understand all the thing but it's seems like a (...) -- https://cloud.damien.gdn/d/f1a7954a557441989432/
• 16:46
  How to convert vfr video to cfr without drop frames by ffmpeg? - alexmoon Newest 'ffmpeg' Questions - Stack Overflow
  When I use -r option to specify constant frame rate, like this, ffmpeg -i my_video_source.mp4 -r 30000/1001 -c:v libx264 -c:a copy -crf 0 my_output_file.mp4 ffmpeg duplicate or DROP some frames to obtain constant frame rate. However, I want to preserve all frames without drop any frames. How can I do this? Is it possible to know maximum frame rate of VFR video?
• 13:24
  Converting mkv files to mp4 with ffmpeg-python - myth0s Newest 'ffmpeg' Questions - Stack Overflow
  I have a lot of .mkv files that I'm trying to convert to .mp4, so I decided to try and program a solution in python. After a few hours, trying to figure out how to copy the subfolders too, I gave up on it and decided to stick with converting individual subfolders, and then copying them over to another directory. I've made a simple script, that should convert .mkv files that are in the same folder as the script. However, I keep getting this error: FileNotFoundError: [WinError 2] The system cannot find the file specified Here's my code: import (...)
• 12:50
  How to properly convert RTL subtitles in ffmpeg? - HTMHell Newest 'ffmpeg' Questions - Stack Overflow
  I'm using the following command to extract subtitles from a video file, and save it as vtt. ffmpeg -i video.mkv -map 0:s:0 subs.vtt 2>&1 It's working and outputs the subtitles file. The problem is with RTL (right to left) languages (Hebrew, Arabic etc.) The punctuation are being misplaced. I will show you an English example of what's happening, for your convenience: Input text: Is he alive? -I don't know. Output text: ?Is he alive .I don't know- If you want (...)
• 10:58
  How to stream RTMP to Azure Media Services? - Abbas Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to stream my camera to Azure Media Services LiveEvent. I'm using Media Services' REST-API to obtain the ingest URL, however the docs don't mention how to stream RTMP from an Android Phone. So far I've tried quiet a few Android RTMP publishing libraries available on Git but each one of them fails at establishing a connection. The list of libraries I've tried so far: https://github.com/TakuSemba/RtmpPublisher (Fails internally NDK while opening a connection) https://github.com/pedroSG94/rtmp-rtsp-stream-client-java (Fails while (...) -- https://github.com/TakuSemba/RtmpPublisher, https://github.com/pedroSG94/rtmp-rtsp-stream-client-java
• 10:22
  Can I use av_write_frame() instead of av_interleaved_write_frame()? - pango Newest 'ffmpeg' Questions - Stack Overflow
  I'm writing an AV muxer DirectShow Filter on Windows platform using ffmpeg, it muxes video & audio streams into mp4/ts/flv file, or rtsp/rtmp/udp stream, I confirm that the dts of video/audio stream is increased orderly so dts reorder is no needed, so can I use av_write_frame() instead of av_interleaved_write_frame()? av_write_frame() writes packet to muxer directly, av_interleaved_write_frame() will make a copy of packet if it is not reference-counted, so I prefer to use av_write_frame() because I think it should be more efficient (no copying or buffering), is my thinking (...)
• 08:56
  FFMPEG streaming RTP: time base not set - Managarm Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to create a small demo to get a feeling for streaming programmatically with ffmpeg. I'm using the code from this question as a basis. I can compile my code, but when I try to run it I always get this error: [rtp ⓐ 0xbeb480] time base not set The thing is, I have set the time base parameters. I even tried setting them for the stream (and the codec associated with the stream) as well, even though this should not be necessary as far as I understand it. This is the relevant section in my code: AVCodec* codec = (...)
• 08:10
  ffmpeg c/c++ get frame count or timestamp and fps - broschb Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg to decode a video file in C. I am struggling to get either the count of the current frame I am decoding or the timestamp of the frame. I have read numerous posts that show how to calculate an estimated frame no based on the fps and frame timestamp, however I am not able to get either of those. What I need: fps of video file, timestamp of current frame or frame no(not calculated) What I have: I am able to get the time of the video using pFormatCtx->duration/AV_TIME_BASE I am counting the frames currently as I process them, and (...)
• 08:07
  Encoding videos with mixed aspect ratios in hevc [closed] - bader515 Newest 'ffmpeg' Questions - Stack Overflow
  I have a huge library of movies, TV Shows, Anime, and Cartoons (about 16tb sorted by plex on my NAS). Most of them are encoded in h.264, and each video has a different aspect ratio (1920x1080,1280x720...etc). Is there a way to re-encode them using any tool to hevc with the same aspect ratio and bit per pixel? I have already tried using this command using ffmpeg, but the result is a bigger size video (with the sd videos): pushd "%2" SET paths=paths.txt SET /A ffmpeg_qv=24 if EXIST %paths% ( for /f "tokens=*" %%a in (%paths%) do ( echo Changing to (...)
• 07:55
  How to play and seek fragmented MP4 audio using MSE SourceBuffer? - Stefan Falk Newest 'ffmpeg' Questions - Stack Overflow
  I am trying for quite some time now to be able to play an audio track on Chrome, Firefox, Safari, etc. but I keep hitting brick walls. My problem is currently that I am just not able to seek within a fragmented MP4 (or MP3). At the moment I am converting audio files such as MP3 to fragmented MP4 (fMP4) and send them chunk-wise to the client. What I do is defining a CHUNK_DURACTION_SEC (chunk duration in seconds) and compute a chunk size like this: chunksTotal = Math.ceil(this.track.duration / CHUNK_DURATION_SEC); chunkSize = Math.ceil(this.track.fileSize / (...) -- this, here, , this example, docs,
• 06:00
  Create fragmented MP4 from MP3 - Stefan Falk Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to convert an MP3 file to a fragmented MP4 like this: ffmpeg -i input.mp3 -strict experimental -acodec aac -b:a 256k -f mp4 \\ -movflags faststart+frag_keyframe+empty_moov+separate_moof output.mp4 However, using Bento4 I can see that there is just one giant mdat object instead of a series of those: [ftyp] size=8+24 major_brand = isom minor_version = 200 compatible_brand = isom compatible_brand = iso2 compatible_brand = iso6 compatible_brand = mp41 [moov] size=8+701 ... [moof] (...) -- Bento4, , source