[CinCV TNG] background rendered portion of a project plays only black in the compositor

Frederic Roenitz ml1 at aimvis.de
Fri Aug 11 21:31:46 CEST 2017

Hi everybody,

has anybody the same problem?:

Background rendering renders fine and the resulting file in
"/tmp/brender*" is ok by itself (mpv plays it and even cinelerra plays
it, when I use "File -> Load files").

*But* the compositor window only shows a black screen while playing
the background rendered portion of the project.


The problem occurs every time on arbitrary projects, for example:

start cinelerra, n, press home key, select 10seconds, insert video
effect: "title" with "Stamp timecode", press home key, shift-g, wait
till background rendering finishes, play

shift-p, Background Rendering options:
Output for background rendering: /tmp/brender.m2ts
File Format: FFMPEG m2ts
Video wrench, Compression: visually_lossless.m2ts
Bitrate, Quality, Video Options: [unchanged]

same thing for all 'File Formats', like for example "JPEG Sequence",
or "FFMPEG" with "mp4", "tiff", ...


Kind greetings


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