July 2018 - FFmpeg-trac - lists.ffmpeg.org

#5866(avformat:new): mxf regression with xiph sample file
by FFmpeg 04 Jul '18

04 Jul '18

#5866: mxf regression with xiph sample file -------------------------------------+------------------------------------- Reporter: cehoyos | Owner: Type: defect | Status: new Priority: important | Component: avformat Version: git- | Keywords: mxf master | regression Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 -------------------------------------+------------------------------------- Lutz Vieweg reported an mxf regression since bf2290a80c124c5168f78be64ee87d9efdd4040d for the following file: https://media.xiph.org/video/derf/meridian/MERIDIAN_SHR_C_EN-XX_US- NR_51_LTRT_UHD_20160909_OV/MERIDIAN_SHR_C_EN-XX_US- NR_51_LTRT_UHD_20160909_OV_01_EN_20_B.mxf {{{ $ ffmpeg -i MERIDIAN_SHR_C_EN-XX_US- NR_51_LTRT_UHD_20160909_OV_01_EN_20_B.mxf out.wav ffmpeg version N-81774-g64545dd Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.7 (SUSE Linux) configuration: --enable-gpl libavutil 55. 30.100 / 55. 30.100 libavcodec 57. 58.100 / 57. 58.100 libavformat 57. 50.100 / 57. 50.100 libavdevice 57. 0.102 / 57. 0.102 libavfilter 6. 63.100 / 6. 63.100 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 1.100 / 2. 1.100 libpostproc 54. 0.100 / 54. 0.100 [mxf @ 0x293c3a0] OPAtom misinterpreted as OP1a? KLV for edit unit 0 extending into next edit unit is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented. [mxf @ 0x293c3a0] If you want to help, upload a sample of this file to ftp://upload.ffmpeg.org/incoming/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel(a)ffmpeg.org) Guessed Channel Layout for Input Stream #0.0 : stereo Input #0, mxf, from 'MERIDIAN_SHR_C_EN-XX_US- NR_51_LTRT_UHD_20160909_OV_01_EN_20_B.mxf': Metadata: application_platform: Microsoft Windows 7 Professional Service Pack 1 (Build 7601) uid : cdb57bb1-4f06-4c77-64e4-c0293f2c7163 generation_uid : 2d654592-04ae-4cf4-35ab-69707dc0de3a company_name : Colorfront product_name : Transkoder product_uid : 3a4fe380-0d01-11e4-869f-3cd92b5c1dfc product_version : 2.7.3.20150121 modification_date: 2016-09-09T11:29:38.000000Z material_package_umid: 0x060A2B340101010501010F20130000002C3E49A0BD1548ACD65D70EA10FAEB6B timecode : 00:00:17;12 Duration: 00:11:58.92, start: 0.000000, bitrate: 2304 kb/s Stream #0:0: Audio: pcm_s24le, 48000 Hz, stereo, s32 (24 bit), 2304 kb/s Metadata: file_package_umid: 0x060A2B340101010501010F2013000000AE2179BC93E24600C47112668D9E21FB Output #0, wav, to 'out.wav': Metadata: application_platform: Microsoft Windows 7 Professional Service Pack 1 (Build 7601) uid : cdb57bb1-4f06-4c77-64e4-c0293f2c7163 generation_uid : 2d654592-04ae-4cf4-35ab-69707dc0de3a company_name : Colorfront product_name : Transkoder product_uid : 3a4fe380-0d01-11e4-869f-3cd92b5c1dfc product_version : 2.7.3.20150121 modification_date: 2016-09-09T11:29:38.000000Z material_package_umid: 0x060A2B340101010501010F20130000002C3E49A0BD1548ACD65D70EA10FAEB6B ISMP : 00:00:17;12 ISFT : Lavf57.50.100 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s Metadata: file_package_umid: 0x060A2B340101010501010F2013000000AE2179BC93E24600C47112668D9E21FB encoder : Lavc57.58.100 pcm_s16le Stream mapping: Stream #0:0 -> #0:0 (pcm_s24le (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used) }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/5866> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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Re: [FFmpeg-trac] #2776(avformat:closed): MXF DV from AAF (Avid) not demuxable
by FFmpeg 04 Jul '18

04 Jul '18

#2776: MXF DV from AAF (Avid) not demuxable -------------------------------------+------------------------------------- Reporter: irius | Owner: Type: defect | Status: closed Priority: important | Component: avformat Version: git-master | Resolution: fixed Keywords: mxf dvvideo | Blocked By: regression | Reproduced by developer: 1 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by cus): * status: open => closed * resolution: => fixed Comment: Fixed in 00a2652df3bf25a27d174cc67ed508b5317cb115. -- Ticket URL: <https://trac.ffmpeg.org/ticket/2776#comment:5> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7296(undetermined:new): "frame size not set" muxing AAC alone to mpegts
by FFmpeg 03 Jul '18

03 Jul '18

#7296: "frame size not set" muxing AAC alone to mpegts -------------------------------------+------------------------------------- Reporter: DeHackEd | Type: defect Status: new | Priority: normal Component: | Version: undetermined | unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: Error message when muxing to mpegts containing only AAC audio. [mpegts @ 0x17754c0] frame size not set How to reproduce: {{{ % ffmpeg -f lavfi -i anullsrc -c aac -f mpegts testbroken.ts ffmpeg version N-91396-g27662ed Copyright (c) 2000-2018 the FFmpeg developers built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18) configuration: --enable-libx264 --extra-cflags='-march=core2' --enable- gpl --enable-libfdk-aac --enable-nonfree --disable-vdpau --disable-outdevs --disable-hwaccels --disable-indevs --disable-lzma --disable-bzlib --enable-zlib --disable-libx265 --enable-indev=lavfi libavutil 56. 18.102 / 56. 18.102 libavcodec 58. 20.104 / 58. 20.104 libavformat 58. 17.101 / 58. 17.101 libavdevice 58. 4.101 / 58. 4.101 libavfilter 7. 25.100 / 7. 25.100 libswscale 5. 2.100 / 5. 2.100 libswresample 3. 2.100 / 3. 2.100 libpostproc 55. 2.100 / 55. 2.100 Input #0, lavfi, from 'anullsrc': Duration: N/A, start: 0.000000, bitrate: 705 kb/s Stream #0:0: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (pcm_u8 (native) -> aac (native)) Press [q] to stop, [?] for help [mpegts @ 0x2db9280] frame size not set Output #0, mpegts, to 'testbroken.ts': Metadata: encoder : Lavf58.17.101 Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s Metadata: encoder : Lavc58.20.104 aac size= 634kB time=00:13:05.48 bitrate= 6.6kbits/s speed= 212x video:0kB audio:200kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 216.485977% [aac @ 0x2dba9c0] Qavg: 65536.000 }}} The output doesn't appear broken though. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7296> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7295(undetermined:new): A/V out of sync with certain input files
by FFmpeg 03 Jul '18

03 Jul '18

#7295: A/V out of sync with certain input files -------------------------------------+------------------------------------- Reporter: atrottmann | Type: defect Status: new | Priority: normal Component: | Version: git- undetermined | master Keywords: a/v-sync | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: There are certain input files that make ffmpeg behave inconsistently with respect to a/v synchronization. It appears that it affects certain files created by HandBrake from DVD sources. How to reproduce: {{{ % ffmpeg -i test.mkv out.wav % ffmpeg -i test.mkv -an out.mpg % ffmpeg -i out.mpg -i out.wav result.mpg }}} This creates result.mpg with a noticeable desynchronization between audio and video. However: {{{ % ffmpeg -i test.mkv -ss 5 out.wav % ffmpeg -i test.mkv -ss 5 -an out.mpg % ffmpeg -i out.mpg -i out.wav result.mpg }}} This creates result.mpg (starting at an offset of five seconds from the original) with correct synchronisation between audio and video. Then, it gets even more weird: {{{ % ffmpeg -i test.mkv test.mpg }}} This creates test.mpg that plays back with correct a/v-sync, but if you then take *this* test.mpg as an input to ffmpeg: {{{ % ffmpeg -i test.mpg out.wav % ffmpeg -i test.mpg -an out.mpg % ffmpeg -i out.mpg -i out.wav result.mpg }}} This creates result.mpg which always has wrong a/v-sync, even if you insert "-ss 5" (or -ss with a different offset). It affects all versions of ffmpeg that I tried, including the recent version in git. The file in question is available at https://guardian.werft22.net/public/test.mkv The A/V sync issue can be best observed at about 70 seconds in, when you see the channel being switched (the push of the button on the TV remote should be at the same time as the "static" noise, and the lips of the guy talking afterwards should match the sound). Unfortunately, I was not able to create a test file where the a/v-sync issue can be observed more quickly. I have used mplayer and vlc to verify the a/v-sync on the input and output files. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7295> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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Re: [FFmpeg-trac] #1981(avformat:reopened): mpegtsraw open of multicast stream may hang
by FFmpeg 02 Jul '18

02 Jul '18

#1981: mpegtsraw open of multicast stream may hang ------------------------------------+------------------------------------ Reporter: Krieger | Owner: Type: defect | Status: reopened Priority: normal | Component: avformat Version: git-master | Resolution: Keywords: mpegtsraw | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ------------------------------------+------------------------------------ Comment (by jhowe321): I will try. In the mean time, for whatever it's worth, I did observe that the issue is not the select per se. When the issue does occur, I can step through mpegts_read_header for the mpegtsraw case and observe that nb_packets grows without bound in the for (;;) loop. So packets are being read but the break for the PCR delta is never taken. -- Ticket URL: <https://trac.ffmpeg.org/ticket/1981#comment:6> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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Re: [FFmpeg-trac] #1981(avformat:reopened): mpegtsraw open of multicast stream may hang
by FFmpeg 02 Jul '18

02 Jul '18

#1981: mpegtsraw open of multicast stream may hang ------------------------------------+------------------------------------ Reporter: Krieger | Owner: Type: defect | Status: reopened Priority: normal | Component: avformat Version: git-master | Resolution: Keywords: mpegtsraw | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ------------------------------------+------------------------------------ Comment (by cehoyos): Replying to [comment:3 jhowe321]: > Replying to [comment:2 cehoyos]: > > Please reopen if you can provide a backtrace. > > Here's one on Windows, multiple branches. Occurs < 5% of the time. Cannot reproduce on Linux. > {{{ > avformat-57.dll!ff_poll(pollfd * fds, unsigned long numfds, int timeout) Line 314 C Symbols loaded. > }}} This looks outdated, please test with current FFmpeg git head and explain how I can reproduce (on Windows). -- Ticket URL: <https://trac.ffmpeg.org/ticket/1981#comment:5> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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Re: [FFmpeg-trac] #1981(avformat:reopened): mpegtsraw open of multicast stream may hang
by FFmpeg 02 Jul '18

02 Jul '18

#1981: mpegtsraw open of multicast stream may hang ------------------------------------+------------------------------------ Reporter: Krieger | Owner: Type: defect | Status: reopened Priority: normal | Component: avformat Version: git-master | Resolution: Keywords: mpegtsraw | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ------------------------------------+------------------------------------ Changes (by jhowe321): * status: closed => reopened * resolution: needs_more_info => -- Ticket URL: <https://trac.ffmpeg.org/ticket/1981#comment:4> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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Re: [FFmpeg-trac] #1981(avformat:closed): mpegtsraw open of multicast stream may hang
by FFmpeg 02 Jul '18

02 Jul '18

#1981: mpegtsraw open of multicast stream may hang -------------------------------------+------------------------------------- Reporter: Krieger | Owner: Type: defect | Status: closed Priority: normal | Component: avformat Version: git-master | Resolution: Keywords: mpegtsraw | needs_more_info Blocking: | Blocked By: Analyzed by developer: 0 | Reproduced by developer: 0 -------------------------------------+------------------------------------- Comment (by jhowe321): Replying to [comment:2 cehoyos]: > Please reopen if you can provide a backtrace. Here's one on Windows, multiple branches. Occurs < 5% of the time. Cannot reproduce on Linux. {{{ avformat-57.dll!ff_poll(pollfd * fds, unsigned long numfds, int timeout) Line 314 C Symbols loaded. avformat-57.dll!ff_network_wait_fd(int fd, int write) Line 79 C Symbols loaded. avformat-57.dll!udp_read(URLContext * h, unsigned char * buf, int size) Line 1069 C Symbols loaded. avformat-57.dll!retry_transfer_wrapper(URLContext * h, unsigned char * buf, int size, int size_min, int(*)(URLContext *, unsigned char *, int) transfer_func) Line 376 C Symbols loaded. avformat-57.dll!ffurl_read(URLContext * h, unsigned char * buf, int size) Line 410 C Symbols loaded. avformat-57.dll!fill_buffer(AVIOContext * s) Line 573 C Symbols loaded. avformat-57.dll!avio_read(AVIOContext * s, unsigned char * buf, int size) Line 668 C Symbols loaded. avformat-57.dll!read_packet(AVFormatContext * s, unsigned char * buf, int raw_packet_size, const unsigned char * * data) Line 2454 C Symbols loaded. avformat-57.dll!mpegts_read_header(AVFormatContext * s) Line 2700 C Symbols loaded. avformat-57.dll!avformat_open_input(AVFormatContext * * ps, const char * filename, AVInputFormat * fmt, AVDictionary * * options) Line 595 C Symbols loaded. }}} libavformat/os_support.c {{{ if (timeout < 0) { rc = select(n, &read_set, &write_set, &exception_set, NULL); } else { struct timeval tv; tv.tv_sec = timeout / 1000; tv.tv_usec = 1000 * (timeout % 1000); ---> rc = select(n, &read_set, &write_set, &exception_set, &tv); } }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/1981#comment:3> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#6121(ffmpeg:new): -stream_loop option does not work, while movie filter with loop option does
by FFmpeg 02 Jul '18

02 Jul '18

#6121: -stream_loop option does not work, while movie filter with loop option does --------------------------------+-------------------------------------- Reporter: slhck | Type: defect Status: new | Priority: normal Component: ffmpeg | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | --------------------------------+-------------------------------------- I want to overlay a spinner on top of a video. When I use the `-stream_loop` option (either with -1 or an arbitrary number of repetitions), the input file is not looped, just played once: Command used: {{{ ffmpeg -i bbb.mp4 -stream_loop -1 -i spinner-256-white.png -filter_complex "[0:v][1:v]overlay[out]" -map "[out]" -t 5 out.avi }}} Output: {{{ ffmpeg version N-83288-gacf1dd5-tessus Copyright (c) 2000-2017 the FFmpeg developers built with Apple LLVM version 8.0.0 (clang-800.0.42.1) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra- version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable- libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable- libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable- ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb libavutil 55. 45.100 / 55. 45.100 libavcodec 57. 75.100 / 57. 75.100 libavformat 57. 66.100 / 57. 66.100 libavdevice 57. 2.100 / 57. 2.100 libavfilter 6. 72.100 / 6. 72.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/werner/Documents/Projects/bufferer/videos/bbb.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf57.56.100 Duration: 00:00:45.08, start: 0.000000, bitrate: 1720 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 1289 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default) Metadata: handler_name : VideoHandler timecode : 00:00:00:00 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 425 kb/s (default) Metadata: handler_name : SoundHandler Stream #0:2(eng): Data: none (tmcd / 0x64636D74) Metadata: handler_name : TimeCodeHandler timecode : 00:00:00:00 Input #1, apng, from '/Users/werner/Documents/Projects/bufferer/spinners/spinner-256-white.png': Duration: N/A, start: 0.000000, bitrate: N/A Stream #1:0: Video: apng, rgba(pc), 256x256, 11.08 fps, 22.25 tbr, 100k tbn, 100k tbc File 'out.avi' already exists. Overwrite ? [y/N] y Output #0, avi, to 'out.avi': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 ISFT : Lavf57.66.100 Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080, q=2-31, 200 kb/s, 24 fps, 24 tbn, 24 tbc (default) Metadata: encoder : Lavc57.75.100 mpeg4 Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1 Stream mapping: Stream #0:0 (h264) -> overlay:main Stream #1:0 (apng) -> overlay:overlay overlay -> Stream #0:0 (mpeg4) Press [q] to stop, [?] for help frame= 120 fps=109 q=31.0 Lsize= 1344kB time=00:00:05.00 bitrate=2201.8kbits/s speed=4.53x video:1335kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.631020 }}} However, with the `movie` filter it works. Here the only problem is that I cannot set an infinite loop… (any ideas how to?) {{{ ffmpeg -i bbb.mp4 -filter_complex "movie=spinner-256-white.png:loop=9999[spinner]; [0:v][spinner]overlay[out]" -map "[out]" -t 5 out2.avi }}} Output: {{{ ffmpeg version N-83288-gacf1dd5-tessus Copyright (c) 2000-2017 the FFmpeg developers built with Apple LLVM version 8.0.0 (clang-800.0.42.1) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra- version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable- libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable- libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable- ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb libavutil 55. 45.100 / 55. 45.100 libavcodec 57. 75.100 / 57. 75.100 libavformat 57. 66.100 / 57. 66.100 libavdevice 57. 2.100 / 57. 2.100 libavfilter 6. 72.100 / 6. 72.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/werner/Documents/Projects/bufferer/videos/bbb.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf57.56.100 Duration: 00:00:45.08, start: 0.000000, bitrate: 1720 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 1289 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default) Metadata: handler_name : VideoHandler timecode : 00:00:00:00 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 425 kb/s (default) Metadata: handler_name : SoundHandler Stream #0:2(eng): Data: none (tmcd / 0x64636D74) Metadata: handler_name : TimeCodeHandler timecode : 00:00:00:00 File 'out2.avi' already exists. Overwrite ? [y/N] y Output #0, avi, to 'out2.avi': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 ISFT : Lavf57.66.100 Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080, q=2-31, 200 kb/s, 24 fps, 24 tbn, 24 tbc (default) Metadata: encoder : Lavc57.75.100 mpeg4 Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1 Stream mapping: Stream #0:0 (h264) -> overlay:main overlay -> Stream #0:0 (mpeg4) Press [q] to stop, [?] for help frame= 120 fps= 93 q=31.0 Lsize= 1354kB time=00:00:05.00 bitrate=2218.7kbits/s speed=3.89x video:1346kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.626175% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/6121> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7292(ffmpeg:new): Implement Feature: Stretch Subtitles Timing by Factor
by FFmpeg 01 Jul '18

01 Jul '18

#7292: Implement Feature: Stretch Subtitles Timing by Factor -------------------------------------+------------------------------------- Reporter: MattMcManis | Type: Status: new | enhancement Component: ffmpeg | Priority: wish Keywords: subtitle, | Version: subtitles, stretch, timing, time | unspecified Blocking: | Blocked By: Analyzed by developer: 0 | Reproduced by developer: 0 -------------------------------------+------------------------------------- I'm looking to have a feature added, '''Stretch Subtitles''' by a factor [0.5, 100.0] range, like how `atempo` or `rubberband` works. https://ffmpeg.org/ffmpeg-filters.html#atempo https://ffmpeg.org/ffmpeg-filters.html#toc-rubberband '''Example:''' Something like `-substretch 3.0` (speed up 300%), `-substretch 0.5` (slow down 50%). Or as a filter `-vf "subtitles=stretch=3.0"`. The program '''MKVToolNix''' is able to do this under the "Timestamps and default duration" section. This would be different that `itsoffset`, which does not stretch, but shifts. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7292> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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