10 June

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

• 00:27
  Why is ffmpeg modifying my 5.1 channel layout? - dongle Newest 'ffmpeg' Questions - Stack Overflow
  I have an AC3 sound file in 5.1 surround, and an MOV file with no sound. I am using FFMPEG to add the sound to the MOV file, and although it works succesfully, for some reason it is modifying the layout of the sound channels, and looking at the audio waveforms it even looks as though it may be mixing them, which is very worrying. The layout of audio channels in the AC3 file is: L, R, C, LFE, Ls, Rs. Here is the command I am using to combine them: ffmpeg -i [path to MOV] -i [path to AC3] -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 [path to output MOV] When I look at (...)

9 June

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

• 23:59
  Mapping streams by language in FFmpeg - ffmpeg123 Newest 'ffmpeg' Questions - Stack Overflow
  I have lots of files with multiple audio and subtitle languages, however the track numbers aren't consistent (the English audio stream isn't always the first) so using a command such as: ffmpeg -i "input.mkv" -map 0 -map -0:a:1 -c:v copy -c:a copy "output.mkv" doesn't yield expected results. After searching around I discovered it was possible to map streams based on language with this command: ffmpeg -i "input.mkv" -map 0 -map -0:m:language:eng -c:v copy -c:a copy "output.mkv" However -map -0:m:language:eng will remove all tracks with the English (...)
• 23:08
  Restartable HLS encoding in ffmpeg - TheGreatRambler Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to encode a HLS video in a restartable way so that it can be run on a preemptive VM. It's possible with the segment muxer in FFmpeg to create HLS files with mpegts that can be restarted (Using the -ss [time], -segment_start_number [num], -mpegts_copyts 1, segment_list_type csv and -segment_list_flags live flags and a bit of coding) but I cannot find equivalent "live" writing for the hls muxer specifically. Either I need a solution that allows for writing fmp4 fragments using the segment muxer or live writing for the hls (...)
• 21:08
  How to record video and audio with ffmpeg and pipe only audio to python process - urico12 Newest 'ffmpeg' Questions - Stack Overflow
  I have an ffmpeg command recording video and audio as one output and I'm trying to add a second output to pipe out only the raw audio to python so that I can run additional processing on the audio chunks. from subprocess import Popen, PIPE, STDOUT record_audio_video_command = f"ffmpeg -i small_bunny_1080p_60fps.mp4 \\ -vcodec libx264 output.mp4 -f s16le pipe:1" record_command = Popen(record_audio_video_command, shell=True, stdout=PIPE, stderr=STDOUT) f = open("output.txt", "w") data = (...)
• 19:53
  FFmpegKit wav compression in android - bovietvidai Newest 'ffmpeg' Questions - Stack Overflow
  I am using arthenica/ffmpeg-kit in android Min version. I want to implement a command that convert and compress a wav file to mp3 using lamemp3 intergrated in that library I need a command for it
• 18:36
  Streaming a video to multiple end users with node.js and ffmpeg - Nick Knapp Newest 'ffmpeg' Questions - Stack Overflow
  I'm designed an API endpoint with node.js and express which will accept a url from a different part of the application, convert it into a webm stream, and allow multiple different end users to receive the end result without too much backend processing. I'd like to have the process running once and pipe the resulting stream to n endpoint calls without using temp files to hold it. So far, all of my attempts to store the output in a temporary object have failed. What would be the best method of going about doing this? The following does not work, but is an example of (...)
• 16:26
  Reducing frames with ffmpeg leads to massive video size reaction - what´s wrong? - Katharina Newest 'ffmpeg' Questions - Stack Overflow
  I am working on a project in which I need to transform many videos from .h264 format to .mp4 cut them after 1 hour duration reduce the framerate from 60 fps to 30 fps Up to now, I came up with following: Convert: for %a in ("*.h264") do ffmpeg -framerate 60 -fflags +genpts -i "%a" -vcodec copy -acodec copy "%~na_Conv.mp4 Cut: for %a in ("*.mp4") do ffmpeg -ss 00:00:00 -i "%a" -to 01:00:00 -vcodec copy -acodec copy "%~na_cut.mp4 Reduce framerate: for %a in ("*.mp4") do ffmpeg -i "%a" -filter:v fps=fps=30 (...)
• 12:07
  FFmpeg with Quicksync: unable to hardware decode file - MuchToKnow Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to convert a h264 video to h265 using hardware decoding/decoding of the iGPU (Quicksync). Decoding does not work throwing the error "Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'" I'm using the most basic example from https://trac.ffmpeg.org/wiki/Hardware/QuickSync. Hardware encoding works (in this example it's software decoded) ffmpeg -v verbose -hwaccel qsv -i VID_20230526_174925.mp4 -c:v hevc_qsv -b:v 5M output.mp4 but hardware decoding (...)