Create Video hangs indefinitely

[jcahill]

Lazy guess without further testing:

Source 1 is only 12s. Assuming that no sequences overlap, cause of hang is likely to be that illegal clip count and min/max duration constraint isn't being checked prior to writing segments.

Params:

• Sources: 2
• Min Stream Duration: 0.2 (default)
• Max Stream Duration: 0.4 (default)
• Clip count: 20 (default), 10, 5, 4

Behavior:

• Clip count below 5 works.
• Clip count 5 or higher causes hang.
• Shell shows the process hanging at ffmpeg handling of temp5.mp4.
• Same behavior across all the jobs.

Source info:

• Only tested the same two sources with different options.
• Both had been downloaded with youtube-dl.
• Source 1 was a webm. Source 2 was an mkv.
• Both were reencoded to mp4 for use here with ffmpeg -strict -2 for aac handling.
• Mediainfo for the two sources included below.

Mediainfo

Source 1

Format                      : MPEG-4
Format profile              : Base Media
Codec ID                    : isom (isom/iso2/avc1/mp41)
File size                   : 452 KiB
Duration                    : 12 s 719 ms
Overall bit rate mode       : Variable
Overall bit rate            : 291 kb/s
Writing application         : Lavf56.40.101

Video
ID                          : 1
Format                      : AVC
Format/Info                 : Advanced Video Codec
Format profile              : High@L1.3
Format settings             : CABAC / 4 Ref Frames
Format settings, CABAC      : Yes
Format settings, RefFrames  : 4 frames
Codec ID                    : avc1
Codec ID/Info               : Advanced Video Coding
Duration                    : 12 s 640 ms
Bit rate                    : 158 kb/s
Width                       : 320 pixels
Height                      : 240 pixels
Display aspect ratio        : 4:3
Frame rate mode             : Constant
Frame rate                  : 25.000 FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Bits/(Pixel*Frame)          : 0.083
Stream size                 : 244 KiB (54%)
Writing library             : x264 core 148 r2643 5c65704
Encoding settings           : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=7 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language                    : English

Audio
ID                          : 2
Format                      : AAC
Format/Info                 : Advanced Audio Codec
Format profile              : LC
Codec ID                    : mp4a-40-2
Duration                    : 12 s 719 ms
Bit rate mode               : Variable
Bit rate                    : 128 kb/s
Channel(s)                  : 2 channels
Channel positions           : Front: L R
Sampling rate               : 48.0 kHz
Frame rate                  : 46.875 FPS (1024 SPF)
Compression mode            : Lossy
Stream size                 : 197 KiB (44%)
Language                    : English
Default                     : Yes
Alternate group             : 1

Source 2

Format                      : MPEG-4
Format profile              : Base Media
Codec ID                    : isom (isom/iso2/avc1/mp41)
File size                   : 105 MiB
Duration                    : 2 min 15 s
Overall bit rate            : 6 530 kb/s
Writing application         : Lavf56.40.101

Video
ID                          : 1
Format                      : AVC
Format/Info                 : Advanced Video Codec
Format profile              : High@L5.1
Format settings             : CABAC / 4 Ref Frames
Format settings, CABAC      : Yes
Format settings, RefFrames  : 4 frames
Codec ID                    : avc1
Codec ID/Info               : Advanced Video Coding
Duration                    : 2 min 15 s
Bit rate                    : 6 393 kb/s
Width                       : 3 840 pixels
Height                      : 2 160 pixels
Display aspect ratio        : 16:9
Frame rate mode             : Constant
Frame rate                  : 30.000 FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Bits/(Pixel*Frame)          : 0.026
Stream size                 : 103 MiB (98%)
Writing library             : x264 core 148 r2643 5c65704
Encoding settings           : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=18 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language                    : English

Audio
ID                          : 2
Format                      : AAC
Format/Info                 : Advanced Audio Codec
Format profile              : LC
Codec ID                    : mp4a-40-2
Duration                    : 2 min 15 s
Bit rate mode               : Constant
Bit rate                    : 132 kb/s
Channel(s)                  : 2 channels
Channel positions           : Front: L R
Sampling rate               : 48.0 kHz
Frame rate                  : 46.875 FPS (1024 SPF)
Compression mode            : Lossy
Stream size                 : 2.11 MiB (2%)
Language                    : English
Default                     : Yes
Alternate group             : 1

[jcahill]

Further prodding:

• I normalized sources to remove other considerations.
• The new test was with Sources 2B and 3.
• The bug persisted, so 'best guess' above wasn't it.

Details

• Source 1
  • Source 1 was very short and 240p.
  • I replaced it outright with Source 3, entirely different media.
• Source 2
  • Source 1 was 4K and had been reencoded with ffmpeg, as mentioned above.
  • I replaced Source 2 with Source 2B.
• Source 2B
  • Source 2B is a 2m15s, 1080 mp4 downloaded with youtube-dl -f 137.
• Source 3
  • Source 3 is a 16m11s, 1080p mp4 downloaded with youtube-dl -f 137.

Mediainfo

Source 2B

Format                      : dash
Codec ID                    : dash (iso6/avc1/mp41)
File size                   : 41.0 MiB
Duration                    : 2 min 15 s
Overall bit rate            : 2 540 kb/s
Encoded date                : UTC 2017-02-04 11:07:05
Tagged date                 : UTC 2017-02-04 11:07:05

Video
ID                          : 1
Format                      : AVC
Format/Info                 : Advanced Video Codec
Format profile              : High@L4
Format settings             : CABAC / 2 Ref Frames
Format settings, CABAC      : Yes
Format settings, RefFrames  : 2 frames
Codec ID                    : avc1
Codec ID/Info               : Advanced Video Coding
Duration                    : 2 min 15 s
Bit rate                    : 2 537 kb/s
Width                       : 1 920 pixels
Height                      : 1 080 pixels
Display aspect ratio        : 16:9
Frame rate mode             : Constant
Frame rate                  : 30.000 FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Bits/(Pixel*Frame)          : 0.041
Stream size                 : 40.9 MiB (100%)
Encoded date                : UTC 2017-02-04 11:07:05
Tagged date                 : UTC 2017-02-04 11:07:05
Color range                 : Limited
Color primaries             : BT.709
Transfer characteristics    : BT.709
Matrix coefficients         : BT.709

Source 3

Format                      : dash
Codec ID                    : dash (iso6/avc1/mp41)
File size                   : 101 MiB
Duration                    : 16 min 11 s
Overall bit rate            : 870 kb/s
Encoded date                : UTC 2018-09-20 20:16:33
Tagged date                 : UTC 2018-09-20 20:16:33

Video
ID                          : 1
Format                      : AVC
Format/Info                 : Advanced Video Codec
Format profile              : High@L4
Format settings             : CABAC / 3 Ref Frames
Format settings, CABAC      : Yes
Format settings, RefFrames  : 3 frames
Codec ID                    : avc1
Codec ID/Info               : Advanced Video Coding
Duration                    : 16 min 11 s
Bit rate                    : 867 kb/s
Width                       : 1 920 pixels
Height                      : 1 080 pixels
Display aspect ratio        : 16:9
Frame rate mode             : Constant
Frame rate                  : 29.970 (30000/1001) FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Bits/(Pixel*Frame)          : 0.014
Stream size                 : 100 MiB (100%)
Encoded date                : UTC 2018-09-20 20:16:33
Tagged date                 : UTC 2018-09-20 20:16:33
Color range                 : Limited
Color primaries             : BT.709
Transfer characteristics    : BT.709
Matrix coefficients         : BT.709

[hellfire3d]

As of now there is absolutely no handling of errors when an effect is applied to a video, which is something I am working on for the next release.

[odjacobs]

youtube