Proxy has audio but no video

Help/How To
1

Shotcut creates the proxy it has audio but no video.

Shotcut Version 20.11.28

ffmpeg version n4.2.4-7-gc9f3835b2b Copyright © 2000-2020 the FFmpeg developers
built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
configuration: --prefix=/d/a/shotcut/shotcut/build/Shotcut --disable-static --disable-doc --enable-gpl --enable-version3 --enable-shared --enable-runtime-cpudetect --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libvpx --enable-libopus --enable-libmfx
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000016bb141b400] CTTS invalid
[h264 @ 0000016bb1304ec0] Reinit context to 1280x720, pix_fmt: yuv420p
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ‘C:/Users/jason/Downloads/Shotcut/01.mp4’:
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:03:57.27, start: 0.000000, bitrate: 4088 kb/s
Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt709, left), 1280x720 [SAR 1:1 DAR 16:9], 3827 kb/s, 23.98 fps, 23.98 tbr, 1494720000.00 tbn, 47.95 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> ac3 (native))
Press [q] to stop, [?] for help
[h264 @ 0000016bb138bc80] Reinit context to 1280x720, pix_fmt: yuv420p
[graph_1_in_0_1 @ 0000016bb1353b40] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
[Parsed_scale_1 @ 0000016bb2e4c080] w:-2 h:360 flags:‘bicubic’ interl:0
[graph 0 input from stream 0:0 @ 0000016bb3a68fc0] w:1280 h:720 pixfmt:yuv420p tb:1/1494720000 fr:1494720000/62342279 sar:1/1 sws_param:flags=2
[Parsed_scale_1 @ 0000016bb2e4c080] w:1280 h:720 fmt:yuv420p sar:1/1 -> w:640 h:360 fmt:yuv420p sar:1/1 flags:0x4
[libx264 @ 0000016bb2e6e580] using SAR=1/1
[libx264 @ 0000016bb2e6e580] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0000016bb2e6e580] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 0000016bb2e6e580] 264 - core 159 r2991M 1771b55 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=1 keyint_min=1 scenecut=40 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to ‘C:/Users/jason/Downloads/Shotcut/Proxies/5217263a5fad43900d15295c2f2b6d3b.pending.mp4’:
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (libx264), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt709, left), 640x360 [SAR 1:1 DAR 16:9], q=-1–1, 23.98 fps, 1494720000.00 tbn, 23.98 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, delay 256, 256 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.54.100 ac3
*** dropping frame 0 from stream 0 at ts -9223372036854775808
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No more output streams to write to, finishing.
video:0kB audio:7414kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.009826%
Input file #0 (C:/Users/jason/Downloads/Shotcut/01.mp4):
Input stream #0:0 (video): 5688 packets read (113498497 bytes); 5686 frames decoded;
Input stream #0:1 (audio): 11122 packets read (7605988 bytes); 11121 frames decoded (11387904 samples);
Total: 16810 packets (121104485 bytes) demuxed
Output file #0 (C:/Users/jason/Downloads/Shotcut/Proxies/5217263a5fad43900d15295c2f2b6d3b.pending.mp4):
Output stream #0:0 (video): 0 frames encoded; 0 packets muxed (0 bytes);
Output stream #0:1 (audio): 7414 frames encoded (11387904 samples); 7414 packets muxed (7591936 bytes);
Total: 7414 packets (7591936 bytes) muxed
[AVIOContext @ 0000016bb138b500] Statistics: 2 seeks, 32 writeouts
[AVIOContext @ 0000016bb12fc040] Statistics: 121256860 bytes read, 1 seeks
Completed successfully in 00:00:24

2

The video in your file C:/Users/jason/Downloads/Shotcut/01.mp4 is broken/garbage.

3

Thanks for the reply.
I suspected it was the videos themselves.
The video was exported from Shotcut, about a third of the videos i export (from Kdenlive as well if that’s relevant) will give the same result when trying to make a proxy.
They are all recent, older ones all seem fine.
They all play fine in everything i have, if i run them through Handbrake they will make proxies.
I have reinstalled a couple of times.

4

I do not reproduce that but also I do not do that regularly. I try avoid multiple generations of lossy encoding. Make sure the job is finished before you copy or use the file. Possibly some hardware encoder or certain parameters may cause the problem. The proxy media generator in Shotcut runs the ffmpeg command line utility, which is probably more reliable than Handbrake in general, but use Handbrake if that works for you.

5

I would of never noticed but i was teaching someone how to use Shotcut and just imported a video i had exported because it’s 720p and lossy so it wouldn’t take long to make a proxy.

I did’t mean using handbrake to make a proxy, i meant if i convert vid 01 that was exported by Shotcut (the one that wont make a proxy) in Handbrake and then import it back in to Shotcut it will make a proxy. Not something i would normally do i was just trying to see if i could figure out why it wouldn’t make the proxy.

6

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