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• lavf/srtdec : rewrite parsing logic

  22 décembre 2015, par Clément Bœsch

  lavf/srtdec : rewrite parsing logic
  Fixes Ticket #5032
  The samples in Ticket #5032 is using \r\r\n as line breaks.  Since we
  
  already are handling \r, or \n, or \r\n as line breaks, \r\n\n will be
  
  considered as a double line breaks. This is an issue because
  
  ff_subtitles_read_text_chunk() will as a result stop extracting a chunk
  
  after just one line.
  So instead of parsing the SRT by "chunks" (which means splitting every
  
  double LB), this new parser is detecting timing lines, and split the
  
  events on this basis. While this sounds safe and simple, it needs to
  
  take into account the event number preceding the timing line while
  
  handling situations such as :
   - event number starting at 0 or actually any number instead of 1
  
   - event numbers not being ordered at all
  
   - event number being followed by text garbage (this really happened,
  
     see Ticket #4898)
  
   - event payload containing one or multiple number (a protagonist saying
  
     a count-down, a date or whatever) which could be confused with a
  
     chapter number
  
   - event number being empty (see Ticket #2167)
  
   - all kind of weird line breaks can appear randomly like wild pokémons
  
   - untrustable line breaks (Ticket #5032)
  The sample madness.srt tries to sum up most of this into one sample,
  
  ticket5032-rrn.srt is the file containing \r\r\n line breaks. and
  
  empty-events-2167.srt contains empty events.
  

  • [DH] libavformat/srtdec.c
  • [DH] tests/fate/subtitles.mak
  • [DH] tests/ref/fate/sub-srt-empty-events
  • [DH] tests/ref/fate/sub-srt-madness-timeshift
  • [DH] tests/ref/fate/sub-srt-rrn-remux

• pgssubdec : fix subpicture output colorspace and range

  24 avril 2016, par Jan Ekström

  pgssubdec : fix subpicture output colorspace and range
  Functionality used before didn’t widen the values from limited to
  
  full range. Additionally, now the decoder uses BT.709 where it
  
  should be used according to the video resolution.
  Default for not yet set colorimetry is BT.709 due to most observed
  
  HDMV content being HD.
  BT.709 coefficients were gathered from the first two parts of BT.709
  
  to BT.2020 conversion guide in ARIB STD-B62 (Pt. 1, Chapter 6.2.2).
  
  They were additionally confirmed by manually calculating values.
  Fixes #4637
  

  • [DH] libavcodec/pgssubdec.c
  • [DH] libavutil/colorspace.h

• Translating Handbrake options to a FFMPEG command

  9 mai 2020, par Arif

  I want to convert a bunch of videos from x264 to x265, but I need to do so with ffmpeg in terminal because it's a remote server. These are my Handbrake options (listed items are ticked) :

  



  Summary tab

  



  

  • Web optimized

  


  • Align A/V Start

  


  



  Dimensions tab unchanged

  



  Filters tab

  



  

  • Sharpen - LapSharp, preset : Medium

  


  



  Video tab

  



  


  • Video codec - H.265 (x265)

  


  • Framerate (FPS) - 30 - Peak Framerate

  


  • Quality - Constant Quality - 28

  


  • Encoder preset - Medium

  


  • Encoder tune - None

  


  • Encoder profile - Auto

  


  



  Audio tab

  



  

  • Audio track - AAC, bitrate : 128

  


  



  Subtitles tab - No subtitles (remove if exists)

  



  This is the ffmpeg command that I've managed to compile so far :

  



  ffmpeg -i input.mp4 -c:v libx265 -crf 28 -c:a aac -b:a 128k -max_muxing_queue_size 400 -movflags +faststart output.mp4

  



  I have the following two questions :

  



  

  1. Does the ffmpeg command provided list all the options except the peak framerate, sharpening filter and removing subtitle ones ? How do I incorporate these three ?

  


  2. Slightly unrelated, but does having -max_muxing_queue_size 400 negatively affect file size or video quality ? I've only included this because I'd ran into encoding errors in the past.

  


  



  Thank you.

  



  My Handbrake log with the above options, if it helps :

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'E:\input.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.10.100
  Duration: 00:02:20.52, start: 0.000000, bitrate: 1487 kb/s
    Stream #0:0(und): Video: h264 (High) [avc1 / 0x31637661]
      yuv420p, tv, bt709/bt709/bt709
      1280x720 [PAR 1:1 DAR 16:9], 1288 kb/s, PAR 1:1 DAR 16:9
      29.97 fps, 30k tbn (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) [mp4a / 0x6134706D]
      44100 Hz, stereo, fltp, 192 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[04:26:49] scan: decoding previews for title 1
[04:26:49] scan: audio 0x1: aac, rate=44100Hz, bitrate=192025 English (AAC) (2.0 ch)
[04:26:50] scan: 10 previews, 1280x720, 29.970 fps, autocrop = 0/0/0/0, aspect 16:9, PAR 1:1
[04:26:50] scan: supported video decoders: avcodec qsv
[04:26:50] libhb: scan thread found 1 valid title(s)
[04:26:50] starting job
[04:26:50] decomb filter thread started for segment 0
[04:26:50] decomb filter thread started for segment 1
[04:26:50] decomb filter thread started for segment 3
[04:26:50] decomb check thread started for segment 0
[04:26:50] decomb check thread started for segment 1
[04:26:50] yadif thread started for segment 0
[04:26:50] decomb check thread started for segment 3
[04:26:50] mask filter thread started for segment 0
[04:26:50] work: track 1, dithering not supported by codec
[04:26:50] mask filter thread started for segment 1
[04:26:50] work: only 1 chapter, disabling chapter markers
[04:26:50] job configuration:
[04:26:50]  * source
[04:26:50]    + E:\input.mp4
[04:26:50]    + title 1, chapter(s) 1 to 1
[04:26:50]    + container: mov,mp4,m4a,3gp,3g2,mj2
[04:26:50] mask filter thread started for segment 3
[04:26:50]    + data rate: 1487 kbps
[04:26:50]  * destination
[04:26:50]    + C:\Users\Hp\Desktop\output.mp4
[04:26:50]    + container: MPEG-4 (libavformat)
[04:26:50]      + optimized for HTTP streaming (fast start)
[04:26:50]      + align initial A/V stream timestamps
[04:26:50]  * video track
[04:26:50]    + decoder: h264
[04:26:50]      + bitrate 1288 kbps
[04:26:50]    + filters
[04:26:50] mask filter thread started for segment 2
[04:26:50]      + Comb Detect (mode=3:spatial-metric=2:motion-thresh=1:spatial-thresh=1:filter-mode=2:block-thresh=40:block-width=16:block-height=16)
[04:26:50]      + Decomb (mode=39)
[04:26:50]      + Framerate Shaper (mode=2:rate=27000000/900000)
[04:26:50]        + frame rate: 29.970 fps -> peak rate limited to 30.000 fps
[04:26:50] mask erode thread started for segment 1
[04:26:50]      + Crop and Scale (width=1280:height=720:crop-top=0:crop-bottom=0:crop-left=0:crop-right=0)
[04:26:50]        + source: 1280 * 720, crop (0/0/0/0): 1280 * 720, scale: 1280 * 720
[04:26:50]      + Sharpen (lapsharp) (y-strength=0.2:y-kernel=isolap:cb-strength=0.2:cb-kernel=isolap)
[04:26:50]    + Output geometry
[04:26:50]      + storage dimensions: 1280 x 720
[04:26:50]      + pixel aspect ratio: 1 : 1
[04:26:50]      + display dimensions: 1280 x 720
[04:26:50]    + encoder: H.265 (libx265)
[04:26:50]      + preset:  medium
[04:26:50]      + profile: auto
[04:26:50]      + quality: 28.00 (RF)
[04:26:50]  * audio track 1
[04:26:50] mask erode thread started for segment 2
[04:26:50]    + decoder: English (AAC) (2.0 ch) (track 1, id 0x1)
[04:26:50]      + bitrate: 192 kbps, samplerate: 44100 Hz
[04:26:50]    + mixdown: Stereo
[04:26:50]    + encoder: AAC (libavcodec)
[04:26:50]      + bitrate: 128 kbps, samplerate: 48000 Hz
[04:26:50] mask erode thread started for segment 3
[04:26:50] mask dilate thread started for segment 0
[04:26:50] mask dilate thread started for segment 1
[04:26:50] mask dilate thread started for segment 2
[04:26:50] decomb check thread started for segment 2
[04:26:50] yadif thread started for segment 1
[04:26:50] yadif thread started for segment 2
[04:26:50] yadif thread started for segment 3
[04:26:50] MTFrame thread started for segment 1
[04:26:50] MTFrame thread started for segment 2
[04:26:50] MTFrame thread started for segment 3
[04:26:50] mask dilate thread started for segment 3
[04:26:50] sync: expecting 4211 video frames
[04:26:50] mask erode thread started for segment 0
[04:26:50] decomb filter thread started for segment 2
[04:26:50] MTFrame thread started for segment 0
x265 [info]: HEVC encoder version 2.6
x265 [info]: build info [Windows][GCC 7.2.0][64 bit] 8bit+10bit+12bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
x265 [info]: Main profile, Level-3.1 (Main tier)
x265 [info]: Thread pool created using 4 threads
x265 [info]: Slices                              : 1
x265 [info]: frame threads / pool features       : 2 / wpp(12 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 2
x265 [info]: Keyframe min / max / scenecut / bias: 30 / 300 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
x265 [info]: References / ref-limit  cu / depth  : 3 / on / on
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 1 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-28.0 / 0.60
x265 [info]: tools: rd=3 psy-rd=2.00 rskip signhide tmvp strong-intra-smoothing
x265 [info]: tools: lslices=4 deblock sao
[04:26:50] sync: first pts video is 0
[04:26:50] sync: "Chapter 1" (1) at frame 1 time 0
[04:26:50] sync: first pts audio 0x1 is 0
[04:40:02] reader: done. 1 scr changes
[04:40:13] work: average encoding speed for job is 5.245789 fps
[04:40:13] comb detect: heavy 3 | light 10 | uncombed 4198 | total 4211
[04:40:13] decomb: deinterlaced 3 | blended 10 | unfiltered 4198 | total 4211
[04:40:13] vfr: 4211 frames output, 0 dropped and 0 duped for CFR/PFR
[04:40:13] vfr: lost time: 0 (0 frames)
[04:40:13] vfr: gained time: 0 (0 frames) (0 not accounted for)
[04:40:13] aac-decoder done: 6052 frames, 0 decoder errors
[04:40:13] h264-decoder done: 4211 frames, 0 decoder errors
[04:40:13] sync: got 4211 frames, 4211 expected
[04:40:13] sync: framerate min 18.394 fps, max 29.970 fps, avg 29.966 fps
x265 [info]: frame I:     18, Avg QP:24.13  kb/s: 2900.85
x265 [info]: frame P:   1079, Avg QP:26.64  kb/s: 1040.14
x265 [info]: frame B:   3114, Avg QP:33.15  kb/s: 235.18
x265 [info]: Weighted P-Frames: Y:0.4% UV:0.4%
x265 [info]: consecutive B-frames: 4.0% 1.4% 20.1% 55.7% 18.8%
encoded 4211 frames in 802.93s (5.24 fps), 452.83 kb/s, Avg QP:31.44
[04:40:13] mux: track 0, 4211 frames, 7970061 bytes, 453.68 kbps, fifo 8192
[04:40:13] mux: track 1, 6588 frames, 2254132 bytes, 128.31 kbps, fifo 8192
[04:40:13] libhb: work result = 0

# Encode Completed ...