Re: [FFmpeg-user] Convert srt Subtitle file into ttml subtitle

* R J on Tuesday, October 05, 2021 at 16:05:16 +0530: I want to convert a .srt file into ttml file. I tried using below command. ffmpeg -i my_srt.srt -y srt-to-ttml.xml -v verbose How is ffmpeg supposed to know to which format you intend to convert? Either ffmpeg -i my_srt.srt -f ttml srt

Re: [FFmpeg-user] How to check if a youtube URL is valid before starting download?

* Bo Berglund on Friday, July 09, 2021 at 08:14:28 +0200: wrote: It did. See the line I highlighted above. All you need to do now is something like filter the output of ffmpeg like: ffmpeg -i bluearrow.mp4 -vf "freezedetect=n=0.01:d=5" -map 0:v:0 -f null - | grep -q 'lavfi.freezedetect.freeze

Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

* Mark Filipak (ffmpeg) on Monday, February 15, 2021 at 21:02:33 -0500: On 02/15/2021 06:29 PM, Mike Soultanian wrote: -bigsnip- You can - easily - let the audio stream start with 0 but the problem is that the result will not play in-sync, see the setps documentation. What is 'setps'? A filter

Re: [FFmpeg-user] Correct conversion of yuvj420p?

* Peter B. on Thursday, October 01, 2020 at 14:16:02 +0200: On 29.09.20 09:56, Christian Ebert wrote: How about doing quick diagnosis with ffprobe before you start, something like: ffprobe -v error \ -print_format default=noprint_wrappers=1:nokey=1 \ -select_streams V -show_entries stream

Re: [FFmpeg-user] Correct conversion of yuvj420p?

Hi Peter, * Peter B. on Monday, September 28, 2020 at 20:42:56 +0200: ...but I still have to find out which files are interpreted as "yuvj420p" by ffmpeg - and then fish them out and treat them with a separate command, since I have batches with and without color_range set, therefore "-pix_fmt +"

Re: [FFmpeg-user] prores_ks vendor: apl0 or ap10 ?

* Paul B Mahol on Tuesday, September 01, 2020 at 10:26:15 +0200: On 9/1/20, Christian Ebert wrote: man ffmpeg-codecs recommends apl0 as prores_ks -vendor: http://ffmpeg.org/ffmpeg-all.html#Private-Options-for-prores_002dks whereas the WIKI says ap10: https://trac.ffmpeg.org/wiki/Encode/VFX

[FFmpeg-user] prores_ks vendor: apl0 or ap10 ?

Hi, man ffmpeg-codecs recommends apl0 as prores_ks -vendor: http://ffmpeg.org/ffmpeg-all.html#Private-Options-for-prores_002dks whereas the WIKI says ap10: https://trac.ffmpeg.org/wiki/Encode/VFX#Prores Which one is it? -- LAST SHIP HOME Winner of the German Ocean Film Award 2019 --->> https:/

[FFmpeg-user] aresample in_channel_layout has no effect

Hi, I'm trying to downsample 4 channel (unknown layout) pcm to stereo. However, aresample's in_channel_layout option has no effect: $ ffmpeg -report -guess_layout_max 0 -i 4ac.wav -filter:a aresample=in_channel_layout=4.0:out_channel_layout=stereo -c:a pcm_s16le -y out.wav ffmpeg started on 20

Re: [FFmpeg-user] Error message when combining -vf and -af in command line

peg/commit/301cee61fa61c55b1c178ebfbc590872e8b033e6 as an attempt to fix an existing bug: https://trac.ffmpeg.org/ticket/4184 Indeed, I kind of guessed that this is meant to warn about duplicate -vf or -af. -- LAST SHIP HOME Die Weltumsegelung der Peter von Danzig Ein Film von Michael Weber und Chris

[FFmpeg-user] Error message when combining -vf and -af in command line

kB other streams:0kB global headers:0kB muxing overhead: 0.968647% TIA Christian -- LAST SHIP HOME Die Weltumsegelung der Peter von Danzig Ein Film von Michael Weber und Christian Ebert --->> https://lastshiphome.de ___ ffmpeg-user mailing lis

Re: [FFmpeg-user] ProRes422 with 8 audio tracks converted to mp4 -- muffles audio 4

fares with -map 0 though. See: https://trac.ffmpeg.org/ticket/5492 -- LAST SHIP HOME Die Weltumsegelung der Peter von Danzig Ein Film von Michael Weber und Christian Ebert --->> https://lastshiphome.de ___ ffmpeg-user mailing list ffmpeg-user@ffmpe

Re: [FFmpeg-user] Create an AAC stream matching the Core Media Audio packet format / priming etc?

* Mark Burton on Wednesday, May 24, 2017 at 13:20:34 +0100 > On 23 May 2017, at 11:20, Christian Ebert wrote: >>> So I looked back at your above -af and realised that the 1024 should >>> actually be 2112 which is Apple’s chosen fixed encoding delay. >>> https

Re: [FFmpeg-user] Create an AAC stream matching the Core Media Audio packet format / priming etc?

* Mark Burton on Monday, May 22, 2017 at 15:22:34 +0100 > On 15 Apr 2017, at 09:22, Christian Ebert wrote: >> Somewhat counterintuitive, but you never know: >> >> -filter:a aresample=async=1:first_pts=0,asetpts=PTS-STARTPTS+1024 >> >> combined with the -t inca

Re: [FFmpeg-user] Create an AAC stream matching the Core Media Audio packet format / priming etc?

* Marton Balint on Saturday, April 15, 2017 at 12:25:58 +0200 > On Sat, 15 Apr 2017, Christian Ebert wrote: >> * Marton Balint on Saturday, April 15, 2017 at 07:55:22 +0200 >>> Last time I checked (a year ago or so), ffmpeg created a correct .mov >>> edit list

Re: [FFmpeg-user] Create an AAC stream matching the Core Media Audio packet format / priming etc?

* Marton Balint on Saturday, April 15, 2017 at 07:55:22 +0200 > Last time I checked (a year ago or so), ffmpeg created a correct .mov > edit list to signal the audio priming. > > https://developer.apple.com/library/mac/documentation/QuickTime/QTFF/QTFFAppenG/QTFFAppenG.html > > Here is patch whic

Re: [FFmpeg-user] Create an AAC stream matching the Core Media Audio packet format / priming etc?

* Carl Eugen Hoyos on Saturday, April 15, 2017 at 00:44:43 +0200 > 2017-04-14 23:44 GMT+02:00 Mark Burton : >> I find it hard having to accept an encode will always play out of >> sync on certain players. > > Could you elaborate a little? > So far, for every ticket, it either turned out that out-o

Re: [FFmpeg-user] Create an AAC stream matching the Core Media Audio packet format / priming etc?

* Mark Burton on Friday, April 14, 2017 at 22:44:52 +0100 >> On 14 Apr 2017, at 22:22, Christian Ebert wrote: >>>> Also, when you run with -v verbose, you'll see a delay (depends >>>> on audio codec), for you case it's probably 1024. Maybe try: >>&g

Re: [FFmpeg-user] Create an AAC stream matching the Core Media Audio packet format / priming etc?

* Mark Burton on Friday, April 14, 2017 at 21:45:07 +0100 >> * Mark Burton on Friday, April 14, 2017 at 16:57:06 +0100 >>> Here is the basic command to reproduce. I have attached the uncut loglevel >>> 99 console output for this command: >>> ffmpeg -i SyncTest24p.mov -c:v libx264 -pix_fmt yuv420p

Re: [FFmpeg-user] Create an AAC stream matching the Core Media Audio packet format / priming etc?

* Mark Burton on Friday, April 14, 2017 at 16:57:06 +0100 > I appreciate this is a tricky area and there appear to be different ways that > some encoders create AAC streams with regards to the padding and remaining > samples etc. I won’t pretend to fully understand all the factors, but I would >

Re: [FFmpeg-user] HLS stream playing issue - Mobile Firefox Android

* Walter Ebert on Tuesday, November 08, 2016 at 09:14:51 +0100 >> On Mobile Firefox - via http://dailymotion.github.io/hls.js/demo/ - i tr >> to load local m3u8 file but i receive the following error in the demo's >> info area: >> >> Buffer Add Codec Error for video/mp4; codecs=avc1.f4001f :Operat

Re: [FFmpeg-user] Removing Timecode Track

* William Caulfield on Tuesday, July 19, 2016 at 10:24:12 -0700 > On Tue, Jul 19, 2016 at 6:53 AM, Christian Ebert wrote: >> * Kieran O Leary on Sunday, July 17, 2016 at 18:14:59 +0100 >>> On 17 Jul 2016 7:05 p.m., "Kelly Haydon" wrote: >>>> Hello -

Re: [FFmpeg-user] Removing Timecode Track

* Kieran O Leary on Sunday, July 17, 2016 at 18:14:59 +0100 > On 17 Jul 2016 7:05 p.m., "Kelly Haydon" wrote: >> Hello - I'd like to use ffmpeg to remove the QT timecode which exists >> in Stream #0:2 of the file expressed below. Basic re-encoding with only the >> first two streams mapped was rec

Re: [FFmpeg-user] Cutting on video frame

* Louis Letourneau on Thursday, July 07, 2016 at 14:05:37 -0400 > I just tried, converting audio for cutting works fine: > ffmpeg -y -ss 0.042000 -i 2708-1.mp4 -codec:a pcm_s32le -codec:v libx264 > -crf 23 -preset fast -pix_fmt yuv420p -flags +global_header > -force_key_frames "expr:gte(t,n_forced*

Re: [FFmpeg-user] Cutting on video frame

* Louis Letourneau on Thursday, July 07, 2016 at 12:38:26 -0400 > When cutting a video, even when transcoding, I often have a small delay > between the video and audio. > > When looking at the video with either vlc or ffplay, I see the first frame > shown twice.(The first is probably a dup until i

Re: [FFmpeg-user] translate rtp to http

* juan carlos Rebate on Wednesday, June 01, 2016 at 04:38:12 +0200 > the problem esque presupposes that I want to play in ffplay, but I do not > want to play in ffplay I want reproduvcirlo in a html5 player for > android Most Android devices cannot play opus audio, use vorbis instead. -- \black\

Re: [FFmpeg-user] How can I extract 8 linear thumbnails from videos with differnt length?

* Christoph Gerstbauer on Thursday, April 07, 2016 at 10:12:14 +0200 >> Depending on the calculation it may be easier/more intuitive to >> use framerate: >> >> ffmpeg -i input -filter:v framerate=1/10 out-%d.jpg >> >> will create one image every ten secs. > > I dont need every x seconds one imag

Re: [FFmpeg-user] How can I extract 8 linear thumbnails from videos with differnt length?

* Moritz Barsnick on Wednesday, April 06, 2016 at 23:13:25 +0200 > On Wed, Apr 06, 2016 at 21:02:17 +0200, Christoph Gerstbauer wrote: >> I want to extract 8 thumbnails from every video I have which represents >> a linear "timeline" over the complete length (100percent) of the video. > [...] >> Is

Re: [FFmpeg-user] Live WebM Streaming

* MKNwebsolutions . on Thursday, November 12, 2015 at 13:05:56 -0500 > I'm converting a live stream (-i rtmp) into libvpx-vp9 output to > -webm_chunk. This looks like it's working perfectly (minus a few must have > future features i.e. auto delete chunks / segments). Next we generate the > webm d

Re: [FFmpeg-user] Setting up a watch folder to encode adaptive bit rate videos

* James Darnley on Tuesday, November 03, 2015 at 01:29:43 +0100 > libx264 definitely supports changing resolution between first and later > passes. Also when then second pass involves a change in profile and/or level, meaning change of frame types? > It also determines frame types in the first pa

Re: [FFmpeg-user] ffmpeg and multiple outputs

* Ricardo Kleemann on Monday, August 03, 2015 at 10:57:01 -0700 > Thanks everyone for the follow-ups. Does anyone know if SDL also works on > OSX, yes > or what would be the equivalent? For this specific purpose (ffmpeg output device) there is no equivalent as far as I know. But I haven't looked

Re: [FFmpeg-user] ffmpeg and multiple outputs

* MrNice on Monday, August 03, 2015 at 12:06:20 +0100 > Obviously I don't have SDL output: > > ./ffmpeg -formats | grep SDL ffmpeg -devices narrows it down better for this purpose imho. -- \black\trash movie _SAME TIME SAME PLACE_ New York, in the summer of 2001 --->> http

Re: [FFmpeg-user] ffmpeg and multiple outputs

* Moritz Barsnick on Monday, August 03, 2015 at 09:48:20 +0200 > On Sun, Aug 02, 2015 at 17:51:39 -0700, Ricardo Kleemann wrote: >> Good point, how would I display ffmpeg on OS X? I’m not quite sure >> what the output device would be? > > The output device "sdl" is the first that comes to mind. >

Re: [FFmpeg-user] Recent build - transpose not working

* Tim Greiser on Tuesday, July 07, 2015 at 13:39:41 -0600 > I have been using -vf "transpose=1" and similar filters for some time with > good results to rotate mp4 files that have been taken on mobile devices. In > my latest build of ffmpeg, the transpose filter no longer seems to have any > effect

Re: [FFmpeg-user] ffprobe -show_frames values

* Werner Robitza on Tuesday, May 12, 2015 at 15:10:07 +0200 > On Tue, May 12, 2015 at 2:45 PM, Christian Ebert wrote: >> * Nicolas George on Tuesday, May 05, 2015 at 17:28:33 +0200 >>> As an additional note, the second solution if by far preferable, because >>>

Re: [FFmpeg-user] ffprobe -show_frames values

* Nicolas George on Tuesday, May 05, 2015 at 17:28:33 +0200 > As an additional note, the second solution if by far preferable, because > forcing the frame type too frequently ruins x264's bit allocation > algorithms. As per this thread elsewhere there are different opinions on that. Others say tha

Re: [FFmpeg-user] Faster vp9

* tim nicholson on Wednesday, April 08, 2015 at 08:03:52 +0100 > On 07/04/15 15:18, Matt Zagrabelny wrote: >> On Mon, Apr 6, 2015 at 11:10 PM, Andrew Sinclair >> wrote: >>> Does anyone have any suggestions for faster vp9 encoding? >> >> I don't have the ffmpeg technical chops to analyze your com

Re: [FFmpeg-user] Reduce mux overhead of HLS stream creation

* Claudiu Rad-Lohanel on Monday, February 16, 2015 at 20:05:50 +0200 > Can't this actually be related to the player (maybe not implementing > HLS standard 100% precisely)? Nope: $ ffprobe -v warning -show_entries format=duration http://media.blacktrash.org/ccc_trailer1.m3u8 [FORMAT] duration=254

Re: [FFmpeg-user] Reduce mux overhead of HLS stream creation

* Claudiu Rad-Lohanel on Monday, February 16, 2015 at 12:31:58 +0200 > On 2/16/2015 10:46 AM, Moritz Barsnick wrote: >> For one, we might identify that your problem has been fixed already. >> Here's a (fixed) ticket concerning a similar matter: >> >> https://trac.ffmpeg.org/ticket/2857 > > No, th

Re: [FFmpeg-user] Output PTS is different from the source

* Wesley Wen on Thursday, December 18, 2014 at 15:43:22 + > I'm transcoding one MPEG2-TS file to MP4, but I noticed the start PTSs of > video and audio of the generated MP4 file are different from the source. > The first video frame starts at 0, while the first audio PTS is negative. I > would

Re: [FFmpeg-user] Mjpeg to h264 audio sync problem

* Petr Tresnak on Friday, December 05, 2014 at 10:34:50 + > the sound start is cut and audio is ahead even more with your command line. > > ffmpeg -i mjpeg.avi -qscale 2 -strict -2 -vcodec mpeg4 -acodec aac out.mp4 > > encoder : Lavf56.14.100 > Duration: 00:00:14.39, start: 0.092880,

Re: [FFmpeg-user] Use ffmpeg to convert stereo audio to mono

* Moritz Barsnick on Friday, December 05, 2014 at 10:37:14 +0100 >> Could we know how ffmpeg determine audio channel number from MP4 file? MP4 >> container indicates it's channel count is 2, but ffprobe shows mono as >> expected. > > ffprobe probably looks at the actual AAC stream? > > Here's a h

Re: [FFmpeg-user] AVStream.codec.time_base deprecated when using -f ssegment

* Claudiu Rad on Tuesday, September 16, 2014 at 22:37:20 +0300 > i am trying to generate a HLS stream from a standard MP4 file. the > muxer generates a pair of warnings for each output .ts file. > however the result seems alright. > > why is this? shouldn't this be fixed? I think that's https://t

Re: [FFmpeg-user] webm_dash_manifest muxer: operation not permitted

* Carl Eugen Hoyos on Tuesday, August 19, 2014 at 13:51:54 + > You are right, the following works fine here: > $ ffmpeg -f webm_dash_manifest -i file.webm > > For which file does it fail for you? All. > How was it created? Those I created with ffmpeg, but same for e.g.: http://video.webmfil

Re: [FFmpeg-user] mpegts file seems corrupt but plays back fine in VLC

* Carl Eugen Hoyos on Tuesday, August 19, 2014 at 13:54:08 + > Christian Ebert gmx.net> writes: >> Or it is this hard to reproduce regression: >> https://trac.ffmpeg.org/ticket/3861 > > Is your ticket reproducible without the segment > muxer? If yes, you have (unf

Re: [FFmpeg-user] mpegts file seems corrupt but plays back fine in VLC

* Moritz Barsnick on Tuesday, August 19, 2014 at 09:00:49 +0200 > On Wed, Aug 13, 2014 at 12:46:26 +0200, Ibrahim Tachijian wrote: >> Using the generated "dump.ts" I am trying to do the following command but >> failing. >> >> "./ffmpeg -i dump.ts -acodec copy -vcodec copy -f mpegts dump2.ts" > >

Re: [FFmpeg-user] webm_dash_manifest muxer: operation not permitted

* Carl Eugen Hoyos on Monday, August 18, 2014 at 22:02:00 + > Christian Ebert gmx.net> writes: > >> $ ffmpeg -f webm_dash_manifest -i test1.webm > > Why do you believe that a file with a webm > suffix is actually a (xml) manifest? > And what's wrong with FFm

[FFmpeg-user] webm_dash_manifest muxer: operation not permitted

Hi, Has anyone got the webm_dash_manifest muxer to work? I just get this: $ ffmpeg -f webm_dash_manifest -i test1.webm \ > -f webm_dash_manifest -i test1.webm \ > -f webm_dash_manifest -i test2.webm \ > -f webm_dash_manifest -i test3.webm \ > -map 0:a -map 0:v -map 1:v -map 2:v \ > -c copy -f web

Re: [FFmpeg-user] Audio advanced when encoding from ProRes to H.264

* Michael Connolly on Monday, August 18, 2014 at 00:40:53 -0700 > I'm new-ish to encoding with FFMPEG and am hoping you guys can > assist on a confusing issue. > > I'm transcoding from ProRes with PCM audio to H.264 with AAC > audio. After transcoding, my audio track is advanced (appears > earlie

Re: [FFmpeg-user] HLS for Apple TV?

* Mark Bogdanoff on Tuesday, July 29, 2014 at 06:36:36 -0700 > Have you run Apple's mediastreamvalidator on your streams? > https://developer.apple.com/library/ios/technotes/tn2235/_index.html Except that these 'HTTP Live Streaming Tools' are not available anymore. (I'd be happy to be proven wron

Re: [FFmpeg-user] only audio ffmpeg

* Lou on Sunday, July 27, 2014 at 13:51:25 -0800 > On Sun, 27 Jul 2014 19:23:45 +0100 > Christian Ebert wrote: >> * Carl Eugen Hoyos on Monday, July 21, 2014 at 15:01:08 + >>> >>> FFmpeg contains a native opus decoder, libopus is not >>> needed. >&g

Re: [FFmpeg-user] new website

* Robert Krüger on Sunday, July 27, 2014 at 21:40:50 +0200 > congratulations on the new website! Well done. +1 -- \black\trash movie _SAME TIME SAME PLACE_ New York, in the summer of 2001 --->> http://www.blacktrash.org/underdogma/stsp.php ___

Re: [FFmpeg-user] only audio ffmpeg

* Carl Eugen Hoyos on Monday, July 21, 2014 at 15:01:08 + > Reindl Harald thelounge.net> writes: >> at least for opus you need to enable the external >> library --enable-libopus is your friend > > FFmpeg contains a native opus decoder, libopus is not > needed. Then the fine new website is

Re: [FFmpeg-user] Still happening - Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.

* Carl Eugen Hoyos on Saturday, July 26, 2014 at 21:14:14 + > Luke Davis newanswertech.com> writes: >> I believe somebody (Carl) said this was fixed in the >> latest version, but in a compilation of a version >> obtained an hour ago from latest, it is still happening >> when segmenting... >

Re: [FFmpeg-user] "Packet header is not contained in global metadata" when segmenting and encoding x264

* Werner Robitza on Wednesday, July 23, 2014 at 15:27:12 +0200 > On Wed, Jul 23, 2014 at 2:46 PM, Christian Ebert wrote: >> >> I guess you just want to copy (-c copy both video and audio), not >> re-encode (-c:v libx264) > > I do want to re-encode (for various rea

Re: [FFmpeg-user] "Packet header is not contained in global metadata" when segmenting and encoding x264

* Werner Robitza on Wednesday, July 23, 2014 at 13:53:51 +0200 > On Wed, Jul 23, 2014 at 12:42 PM, Carl Eugen Hoyos wrote: >> Why are you using a bitstream filter when re-encoding? >> The normal usecase for a bitstream filter is remuxing. > > If I don't use it, e.g. > > ffmpeg -y -i tmp/tmpPass2

Re: [FFmpeg-user] Alternative options for comma-separated filters?

* Sam Marrocco on Thursday, July 10, 2014 at 12:31:02 -0400 > I have an application that uses ffmpeg to perform file conversions including > applying the filter -vf colormatrix=bt601:bt709. I would like to also apply a > gamma changing filter such as -vf mp=eq2=1:1:0:1:2:1:1:1. > > The problem i