April 2022 - FFmpeg-trac - lists.ffmpeg.org

#7155(ffmpeg:new): Add option to stop writing at position relative to EOF
by FFmpeg 16 Dec '24

16 Dec '24

#7155: Add option to stop writing at position relative to EOF ----------------------------------+--------------------------------------- Reporter: clone206 | Type: enhancement Status: new | Priority: wish Component: ffmpeg | Version: 3.4 Keywords: seek | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+--------------------------------------- Summary of the bug: Feature request How to reproduce: N/A Add main option to allow stopping of writing to output at position relative to "end of file", where 0 is eof, and negative values are earlier in the file. Proposed switch: "-toeof", like "-sseof" but for stopping point instead of beginning point. Background: I have ripped SACD audio tracks with extraneous loud noises at the last few hundred milliseconds of each track, and want to chop off that duration from the end of each file as part of a batch process. I would like to do something like the following on each file: ffmpeg -i input.flac -toeof -00:00:00.9 output.flac -- Ticket URL: <https://trac.ffmpeg.org/ticket/7155> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#9724(ffmpeg:new): Duplicate character pairs in Closed Captions
by FFmpeg 14 Dec '24

14 Dec '24

#9724: Duplicate character pairs in Closed Captions -------------------------------------+------------------------------------- Reporter: Selcuk | Type: defect Ozturk | Status: new | Priority: normal Component: ffmpeg | Version: 4.4.1 Keywords: eia_608, | Blocked By: closed captions | Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: Bug in the handling of eia-608 closed captions. Captions have duplicated character pairs. The bug did not exist in ffmpeg versions 4.3.2 and earlier. How to reproduce: You will need a HDHomerun Prime and a cable service with cable card like Verizon FIOS or Comcast. {{{ % ffmpeg -i http://192.168.78.45:5004/auto/v103 -c:v libx264 -preset:v ultrafast -g 29 -crf 40 -s 128x72 -bsf:v h264_mp4toannexb -map 0:v -f mpegts -t 60 z-4.4.1.ts % ffmpeg -f lavfi -i movie=z-4.4.1.ts[out+subcc] z-4.4.1.srt }}} The resulting z-4.4.1.srt file has text like the following: ---- 5 00:00:04,571 --> 00:00:10,410 <font face="Monospace">{\an7}ABABORORTITIONON,, T THAHATT I I TETEXAXASS D DOEOESS H HAVAVEE E</font> 6 00:00:10,410 --> 00:00:11,845 <font face="Monospace">{\an7}TETEXAXASS D DOEOESS H HAVAVEE E LALAWSWS T THAHATT A ARERE P PUT</font> ---- Using the old releases available on https://johnvansickle.com/ffmpeg/ site, I have narrowed down the introduction of the bug somewhere between ffmpeg versions 4.3.2 and 4.4.1. All versions up to and including 4.3.2 are working properly and producing correct closed captions. All versions from 4.4.1 on have this bug. The problem is at the recording of the TS file and not at the extraction of SRT file. Playing the resulting TS file in VLC demonstrates the problem in closed captions. I can provide both the recorded TS files and the SRT files if needed. -- Ticket URL: <https://trac.ffmpeg.org/ticket/9724> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#6690(avformat:new): Raw Electronic Arts ADPCM support
by FFmpeg 09 Dec '24

09 Dec '24

#6690: Raw Electronic Arts ADPCM support ----------------------------------+--------------------------------------- Reporter: koops | Type: enhancement Status: new | Priority: normal Component: avformat | Version: unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+--------------------------------------- Summary of the bug: How to reproduce: {{{ $ ffmpeg -i sound.XA sound.wav sound.XA: Invalid data found when processing input }}} I would like support for headerless Electronic Arts ADPCM files to be added. These files are common in some Electronic Arts games, like Harry Potter and the Chamber of Secrets and Brother Bear. The format is similar to adpcm_ea_r1, but the file is always mono, there is no channels header. ADPCM history is always initialized to [0, 0]. File size is always a multiple of 15, there is no raw sample mode (0xEE). Sample rate is 22050Hz by default. Files can be encoded into this format using sx.exe: {{{ > sx -raw -eaxa_blk sample.wav -=sample.XA }} I attached a test case, a XA file and the corresponding decoded raw file. This is decoder code in C# (I release it under CC0): {{{ using System; using System.IO; using System.Text; namespace KoopsAudioDecoder { class Program { static int coeff1, coeff2, shift, adpcmHistory1 = 0, adpcmHistory2 = 0; static readonly int[] EA_XA_TABLE = new int[] { 0, 0, 240, 0, 460, -208, 392, -220, }; static void DecodeSingleFrame(BinaryReader stream, BinaryWriter outbuf) { int frameInfo = stream.ReadByte(); coeff1 = EA_XA_TABLE[((frameInfo >> 4) & 15) << 1]; coeff2 = EA_XA_TABLE[(((frameInfo >> 4) & 15) << 1) + 1]; shift = (frameInfo & 15) + 8; for (int i = 0; i < 14; i++) { int sample_byte = stream.ReadByte(); int[] nibbles = { sample_byte >> 4, sample_byte & 15 }; foreach (int nibble in nibbles) { int sample = GetSample(nibble); outbuf.Write(Clamp16(sample)); } } } private static int GetSample(int nibble) { int sample = (nibble << 28 >> shift) + (coeff1 * adpcmHistory1) + (coeff2 * adpcmHistory2) >> 8; adpcmHistory2 = adpcmHistory1; adpcmHistory1 = sample; return sample; } static private short Clamp16(int sample) { if (sample > 32767) { return 32767; } else if (sample < -32768) { return -32768; } else { return (short) sample; } } static int Main(string[] args) { if (args.Length != 1) { Console.WriteLine("This program takes only one argument, input file"); return 1; } string inputFileName = args[0], outputFileName = Path.ChangeExtension(inputFileName, "raw"); Stream inputFile = File.OpenRead(inputFileName), outputFile = File.OpenWrite(outputFileName); BinaryReader inputFileReader = new BinaryReader(inputFile); BinaryWriter outputFileWriter = new BinaryWriter(outputFile); while (inputFile.Length - inputFile.Position >= 15) { DecodeSingleFrame(inputFileReader, outputFileWriter); } if (inputFile.Length - inputFile.Position > 0) { Console.WriteLine("File has {0} spare bytes.", inputFile.Length - inputFile.Position); } return 0; } } } }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/6690> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7799(avcodec:new): hevc_mp4toannexb filter inserts extradata wrong position
by FFmpeg 07 Dec '24

07 Dec '24

#7799: hevc_mp4toannexb filter inserts extradata wrong position ---------------------------------+--------------------------------------- Reporter: gudbooy | Type: defect Status: new | Priority: normal Component: avcodec | Version: unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------+--------------------------------------- Summary of the bug: After applied hevc_mp4toannexb filter to the attached video (refer to the below link), the frames become broken from the video players (e.g. VLC, ffplay) The problem is caused by prepending the extra-data to IRAP frames in libavcodec/hevc_mp4toannexb_bsf.c. This video contains own vps/sps/pps for every IRAP frames. The extradata from hevcc is slightly different from every IRAP frames have (in this case QP value is different) and the hevc_mp4toannexb filter prepends the different extradata to every IRAP frames, causing the broken frames. Video File Repo : https://www.dropbox.com/s/tpyohk6vf096zxm/hevc_after_mp4toannexb_conversion… I am afraid that I can't connect to ftp://upload.ffmpeg.org, so I just attached to the dropbox url How to reproduce: {{{ % ffmpeg -i hevc_after_mp4toannexb_conversion_qp_value_modified.mp4 -codec copy -bsf:v hevc_mp4toannexb output.hevc $vlc output.hevc }}} Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7799> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#6207(avformat:new): Wrong mkv codec ID for ac3 with bitstream_id > 8
by FFmpeg 07 Dec '24

07 Dec '24

#6207: Wrong mkv codec ID for ac3 with bitstream_id > 8 --------------------------------------+---------------------------------- Reporter: cehoyos | Owner: Type: defect | Status: new Priority: normal | Component: avformat Version: git-master | Keywords: mkv ac3 Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 --------------------------------------+---------------------------------- I will attached two mkv samples with codec ID A_AC3/BSID9 and A_AC3/BSID10 that get an incorrect codec ID A_AC3 when remuxed with FFmpeg. {{{ $ ffmpeg -i ac3bsid9.mkv -acodec copy out.mkv ffmpeg version N-83691-g7f62368 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 4.7 (SUSE Linux) configuration: --enable-gpl libavutil 55. 47.100 / 55. 47.100 libavcodec 57. 81.100 / 57. 81.100 libavformat 57. 66.102 / 57. 66.102 libavdevice 57. 3.100 / 57. 3.100 libavfilter 6. 74.100 / 6. 74.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 Input #0, matroska,webm, from 'ac3bsid9.mkv': Metadata: encoder : libebml v1.3.4 + libmatroska v1.4.5 creation_time : 2017-02-28T20:08:32.000000Z Duration: 00:00:01.02, start: 0.000000, bitrate: 141 kb/s Stream #0:0: Audio: ac3, 24000 Hz, mono, fltp, 96 kb/s (default) Metadata: BPS : 96000 BPS-eng : 96000 DURATION : 00:00:01.024000705 DURATION-eng : 00:00:01.024000705 NUMBER_OF_FRAMES: 16 NUMBER_OF_FRAMES-eng: 16 NUMBER_OF_BYTES : 12288 NUMBER_OF_BYTES-eng: 12288 _STATISTICS_WRITING_APP: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-02-28 20:08:32 _STATISTICS_WRITING_DATE_UTC-eng: 2017-02-28 20:08:32 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Output #0, matroska, to 'out.mkv': Metadata: encoder : Lavf57.66.102 Stream #0:0: Audio: ac3 ([0] [0][0] / 0x2000), 24000 Hz, mono, fltp, 96 kb/s (default) Metadata: BPS : 96000 BPS-eng : 96000 DURATION : 00:00:01.024000705 DURATION-eng : 00:00:01.024000705 NUMBER_OF_FRAMES: 16 NUMBER_OF_FRAMES-eng: 16 NUMBER_OF_BYTES : 12288 NUMBER_OF_BYTES-eng: 12288 _STATISTICS_WRITING_APP: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-02-28 20:08:32 _STATISTICS_WRITING_DATE_UTC-eng: 2017-02-28 20:08:32 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help size= 13kB time=00:00:00.96 bitrate= 114.5kbits/s speed=3.69e+03x video:0kB audio:12kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.832683% }}} {{{ $ ffmpeg -i ac3bsid10.mkv -acodec copy out.mkv ffmpeg version N-83691-g7f62368 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 4.7 (SUSE Linux) configuration: --enable-gpl libavutil 55. 47.100 / 55. 47.100 libavcodec 57. 81.100 / 57. 81.100 libavformat 57. 66.102 / 57. 66.102 libavdevice 57. 3.100 / 57. 3.100 libavfilter 6. 74.100 / 6. 74.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 Input #0, matroska,webm, from 'ac3bsid10.mkv': Metadata: encoder : libebml v1.3.4 + libmatroska v1.4.5 creation_time : 2017-02-28T20:08:01.000000Z Duration: 00:00:01.15, start: 0.000000, bitrate: 136 kb/s Stream #0:0: Audio: ac3, 8000 Hz, mono, fltp, 96 kb/s (default) Metadata: BPS : 96083 BPS-eng : 96083 DURATION : 00:00:01.151990784 DURATION-eng : 00:00:01.151990784 NUMBER_OF_FRAMES: 6 NUMBER_OF_FRAMES-eng: 6 NUMBER_OF_BYTES : 13824 NUMBER_OF_BYTES-eng: 13824 _STATISTICS_WRITING_APP: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-02-28 20:08:01 _STATISTICS_WRITING_DATE_UTC-eng: 2017-02-28 20:08:01 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Output #0, matroska, to 'out.mkv': Metadata: encoder : Lavf57.66.102 Stream #0:0: Audio: ac3 ([0] [0][0] / 0x2000), 8000 Hz, mono, fltp, 96 kb/s (default) Metadata: BPS : 96083 BPS-eng : 96083 DURATION : 00:00:01.151990784 DURATION-eng : 00:00:01.151990784 NUMBER_OF_FRAMES: 6 NUMBER_OF_FRAMES-eng: 6 NUMBER_OF_BYTES : 13824 NUMBER_OF_BYTES-eng: 13824 _STATISTICS_WRITING_APP: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-02-28 20:08:01 _STATISTICS_WRITING_DATE_UTC-eng: 2017-02-28 20:08:01 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help size= 15kB time=00:00:00.96 bitrate= 126.7kbits/s speed=5.03e+03x video:0kB audio:14kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.997107% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/6207> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#9428(avcodec:new): avcodec: truehd parser drops data but does not adjust initial timestamps
by FFmpeg 02 Dec '24

02 Dec '24

#9428: avcodec: truehd parser drops data but does not adjust initial timestamps ---------------------------------+-------------------------------------- Reporter: jeeb | Type: defect Status: new | Priority: normal Component: avcodec | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------+-------------------------------------- Summary of the bug: 1. The TrueHD parser does drop data received until sync with first random access point packet is received. 2. The parser framework seems to be oblivious to this, and sticks the first received buffer's dts/pts on the received data. How to reproduce: The bug is easily reproducible with a Matroska sample that starts with non-random access point TrueHD packets, as the demuxer itself requests parsing for TrueHD and MLP. This can be reproduced by just utilizing the parsing API by itself as well with av_parser_parse2, as this is how I noticed the issue originally. {{{ % ffprobe -of json -show_packets -show_frames -i http://www.cccp- project.net/beta/test_files/mzero_truehd_sample.mkv }}} {{{ { "packets_and_frames": [ { "type": "packet", "codec_type": "audio", "stream_index": 1, "pts": 0, "pts_time": "0.000000", "dts": 0, "dts_time": "0.000000", "size": "324", "pos": "501277", "flags": "K_" }, { "type": "frame", "media_type": "audio", "stream_index": 1, "key_frame": 1, "pts": 0, "pts_time": "0.000000", "pkt_dts": 0, "pkt_dts_time": "0.000000", "best_effort_timestamp": 0, "best_effort_timestamp_time": "0.000000", "pkt_pos": "501277", "pkt_size": "324", "sample_fmt": "s32", "nb_samples": 40, "channels": 6, "channel_layout": "5.1(side)", "side_data_list": [ { "side_data_type": "AVMatrixEncoding" } ] }, { "type": "packet", "codec_type": "audio", "stream_index": 1, "pts": 93, "pts_time": "0.093000", "dts": 93, "dts_time": "0.093000", "size": "132", "pos": "559062", "flags": "__" }, { "type": "frame", "media_type": "audio", "stream_index": 1, "key_frame": 1, "pts": 93, "pts_time": "0.093000", "pkt_dts": 93, "pkt_dts_time": "0.093000", "best_effort_timestamp": 93, "best_effort_timestamp_time": "0.093000", "pkt_pos": "559062", "pkt_size": "132", "sample_fmt": "s32", "nb_samples": 40, "channels": 6, "channel_layout": "5.1(side)", "side_data_list": [ { "side_data_type": "AVMatrixEncoding" } ] } ] } }}} The first received packet (324 bytes, random access point) came from a Matroska SimpleBlock with the pts=0.092. Yet since most likely the parser framework didn't get notified that the input got dropped until then, you will get the timestamps of when the feeding started. The following buffers will get the right timestamps, as seen by the pts=0.093. I did start looking into this, but unfortunately was not able to focus on it, and decided to file this issue so that it is known by others than just me. -- Ticket URL: <https://trac.ffmpeg.org/ticket/9428> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#6609(ffmpeg:new): SamplingRateBox should be used if the value is greater than INT16_MAX
by FFmpeg 23 Nov '24

23 Nov '24

#6609: SamplingRateBox should be used if the value is greater than INT16_MAX -------------------------------------+------------------------------------- Reporter: fbeaufort | Type: defect Status: new | Priority: normal Component: ffmpeg | Version: Keywords: flac, | unspecified isobmff, mp4 | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: SamplingRateBox should be used if the value is greater than INT16_MAX How to reproduce: 1. Grab file from https://storage.googleapis.com/media-session/bear- 1280x720.mp4 2. Run ffmpeg command below {{{ % ffmpeg -i bear-1280x720.mp4 -map 0:0 -acodec flac -strict -2 -ar 192000 bear-flac-192kHz.mp4 }}} 3. The `bear-flac-192kHz.mp4` file should have a valid sample rate, not 0. Here are some #ffmpeg logs for some context: {{{ 12:58:08 PM <jya> you can create a bug that the SamplingRateBox (as per ISO 14496-2 12.2.3.2) is to be used if the value is greater than INT16_MAX 12:59:14 PM <jya> they have provision for that inthe SoundDescription V2, but i can't find this anywhere in the spec 12:59:20 PM <jya> must be a QT thing 1:00:14 PM <jya> and if they properly create a SamplingRateBox, need to file a bug in Firefox that our mp4 demuxer doesn't support it :) }}} And here's the ffmpeg version: {{{ % ffmpeg -version ffmpeg version 3.3.3-static http://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2017 the FFmpeg developers }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/6609> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7855(undetermined:new): Last subtitle in MP4 is displayed forever
by FFmpeg 23 Nov '24

23 Nov '24

#7855: Last subtitle in MP4 is displayed forever --------------------------------------+---------------------------------- Reporter: fumoboy007 | Type: defect Status: new | Priority: normal Component: undetermined | Version: 4.1 Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | --------------------------------------+---------------------------------- Summary of the bug: Decoding the last tx3g subtitle in an MP4 produces an incorrect duration, causing the subtitle to stay on-screen until the end of the media. How to reproduce: Play the attached file in VLC. Also, run the following command and compare the outputted subtitle file with the original subtitle file (also attached). {{{ $ ffmpeg -i Permanent\ Last\ Subtitle.mp4 -map 0:s:0 FFmpeg\ Output.srt ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers built with Apple LLVM version 10.0.0 (clang-1000.11.45.5) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable- avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable- libopencore-amrwb --enable-librtmp --enable-libspeex --enable-videotoolbox libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Permanent Last Subtitle.mp4': Metadata: major_brand : mp42 minor_version : 1 compatible_brands: mp41mp42isom creation_time : 2019-04-18T05:09:42.000000Z Duration: 00:01:05.04, start: 0.000000, bitrate: 431 kb/s Stream #0:0(deu): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 640x360, 289 kb/s, 23.97 fps, 23.98 tbr, 24k tbn, 48k tbc (default) Metadata: creation_time : 2019-04-18T05:09:42.000000Z handler_name : Core Media Video encoder : AVC Coding Stream #0:1(deu): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 137 kb/s (default) Metadata: creation_time : 2019-04-18T05:09:42.000000Z handler_name : Core Media Audio Stream #0:2(eng): Subtitle: mov_text (tx3g / 0x67337874), 640x54, 0 kb/s (default) Metadata: rotate : 0 creation_time : 2019-04-18T05:10:26.000000Z Output #0, srt, to 'FFmpeg Output.srt': Metadata: major_brand : mp42 minor_version : 1 compatible_brands: mp41mp42isom encoder : Lavf58.20.100 Stream #0:0(eng): Subtitle: subrip (srt), 640x54 (default) Metadata: encoder : Lavc58.35.100 srt creation_time : 2019-04-18T05:10:26.000000Z Stream mapping: Stream #0:2 -> #0:0 (mov_text (native) -> subrip (srt)) Press [q] to stop, [?] for help size= 0kB time=00:00:45.25 bitrate= 0.0kbits/s speed=3.59e+04x video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 79.069771% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/7855> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7485(undetermined:new): HLS not accurately seeking
by FFmpeg 22 Nov '24

22 Nov '24

#7485: HLS not accurately seeking -------------------------------------+------------------------------------- Reporter: lletourn | 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: Seeking accurately in HLS videos doens't work, but it works fine in other containers (mp4, mkv, etc) tried with ffmpeg version 3.4.4 and master f85fa100db7d35952 {{{ % ./ffmpeg version N-92147-gf85fa100db Copyright (c) 2000-2018 the FFmpeg developers built with gcc 7 (Ubuntu 7.3.0-16ubuntu3) configuration: --enable-libfreetype --enable-gpl --enable-libx264 --enable-libx265 --enable-nonfree --enable-libfdk-aac --enable-libopus --enable-libpulse --enable-libvpx --enable-openssl --enable-static libavutil 56. 19.101 / 56. 19.101 libavcodec 58. 32.100 / 58. 32.100 libavformat 58. 18.104 / 58. 18.104 libavdevice 58. 4.105 / 58. 4.105 libavfilter 7. 33.100 / 7. 33.100 libswscale 5. 2.100 / 5. 2.100 libswresample 3. 2.100 / 3. 2.100 libpostproc 55. 2.100 / 55. 2.100 }}} How to reproduce: Create an HLS video like this {{{ % mkdir a % ./ffmpeg -y -s 640x480 -f rawvideo -pix_fmt rgb24 -r 25 -i /dev/zero -vf "drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMono.ttf: text=%{n}: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1: boxcolor=0x000000FF" -an -vcodec libx264 -preset medium -tune stillimage -crf 24 -pix_fmt yuv420p -shortest -force_key_frames "expr:gte(t,n_forced*5)" -bf 0 -hls_time 5 -hls_list_size 0 -hls_wrap 0 -hls_allow_cache 1 -hls_segment_filename "a/a_%04d.ts" -t 60 a/a.m3u8 }}} And also create it's mp4 counterpart: {{{ % ./ffmpeg -i a/a.m3u8 -codec copy a.mp4 }}} And try to seek in any segment: {{{ F=130;rm -f f.png;./ffmpeg -y -ss `awk "BEGIN {print (${F})/25}"` -i a/a.m3u8 -f image2 -q:v 1 -vframes 1 f.png ./ffplay f.png }}} Got frame 250 (bad) {{{ F=126;rm -f f.png;./ffmpeg -y -ss `awk "BEGIN {print (${F})/25}"` -i a/a.m3u8 -f image2 -q:v 1 -vframes 1 f.png ; feh f.png }}} Got frame 250 (bad) {{{ F=125;rm -f f.png;./ffmpeg -y -ss `awk "BEGIN {print (${F})/25}"` -i a/a.m3u8 -f image2 -q:v 1 -vframes 1 f.png ./ffplay f.png }}} Got frame 125 (good) {{{ F=124;rm -f f.png;./ffmpeg -y -ss `awk "BEGIN {print (${F})/25}"` -i a/a.m3u8 -f image2 -q:v 1 -vframes 1 f.png ./ffplay f.png }}} Got frame 125 (bad) Now try the same with the mp4 and you'll always get the exact right frame {{{ F=130;rm -f f.png;./ffmpeg -y -ss `awk "BEGIN {print (${F})/25}"` -i a.mp4 -f image2 -q:v 1 -vframes 1 f.png ./ffplay f.png }}} Got 130 (good) {{{ F=126;rm -f f.png;./ffmpeg -y -ss `awk "BEGIN {print (${F})/25}"` -i a.mp4 -f image2 -q:v 1 -vframes 1 f.png ./ffplay f.png }}} Got 126 (good) etc it seems to only be seeking on segment boundaries. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7485> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#9535(undetermined:new): PNG decoder fails processing more than a certain number of frames
by FFmpeg 20 Nov '24

20 Nov '24

#9535: PNG decoder fails processing more than a certain number of frames -------------------------------------+------------------------------------- Reporter: panthalassa | Type: defect Status: new | Priority: normal Component: | Version: undetermined | unspecified Keywords: png | Blocked By: decoding | Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: trying to encode a video with more than a certain number of frames from a .png sequence results in corrupted output and an out-of-memory scenario How to reproduce: Sorry but due to the absurd bandwith requirements I likely won't be able to upload the offending files. This can likely be reproduced by converting a long, losslessly compressed video into a sufficient number of PNG's (my stats: 11 minute 1080p video at 60fps = ~39,000 frames, each frame 1.9mb making the uncompressed video around 80gb) I acquired these frames from rendering in Blender Present on all versions I've tested from 3.4.8 to 4.4.1. Any png-based input fails with too many files in the directory - symptoms include the encoded video having scrambled frame order after about 1000 frames, as well as the [png @ 0x??? chunk too big] error after about 14750 processed frames. Taking a generous swathe of images around the error points and processing them separately produces no errors implying that a corrupted PNG is not to blame. Putting a smaller (1-2000) number of frames in a directory and processing them separately produces a successful result longer than 1000 frames, past the previous point of onset for corruption. Unknown exactly how many frames are needed to cause the error. Any format encoding that receiving raw PNG input appears to be bugged - libx264rgb, libx265, ffv1 tested Latest tested version: clean install of N-104671-g2cddb2f7a8 on a live USB of Linux Mint 19.1 MATE following the instructions on the Compile FFMPEG page {{{ % ffmpeg -framerate 60 -f image2 -pattern_type glob -i $1'/*.png' -vcodec libx265 -pix_fmt yuv420p10le -vf scale=out_range=pc $2 % ffmpeg -framerate 60 -f image2 -pattern_type glob -i $1'/*.png' -vcodec ffv1 -coder 1 -level 3 -threads 4 -slices 4 -pix_fmt bgra $2 ffmpeg version: N-104671-g2cddb2f7a8 built on ... Linux Mint 19.1 MATE live USB }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/9535> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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