On Monday, June 14, 2021, gorge rankin via Cin <cin@lists.cinelerra-gg.org> wrote:
Hello,
I cannot seem to figure out how to render video over 60FPS.
Yes, i can confirm this bug.. Just set project/timeline to 100 fps and got this..
After inspecting cinelerram/ffmpeg.C I tried few things, but working one was just replacing this check_framerate function with std. function from libavcodec:
AVRational FFMPEG::to_sample_aspect_ratio(Asset *asset)
@@ -2917,7 +2919,8 @@ int FFMPEG::open_encoder(const char *type, const char *spec)
int mask_h = (1<<desc->log2_chroma_h)-1;
ctx->height = (vid->height+mask_h) & ~mask_h;
ctx->sample_aspect_ratio = to_sample_aspect_ratio(asset);
- AVRational frame_rate = check_frame_rate(codec->supported_framerates, vid->frame_rate);
+ //AVRational frame_rate = check_frame_rate(codec->supported_framerates, vid->frame_rate);
+ AVRational frame_rate = av_d2q(vid->frame_rate, 1000);
if( !frame_rate.num || !frame_rate.den ) {
eprintf(_("check_frame_rate failed %s\n"), filename);
ret = 1;
I tested 29.97 encoding and 100 and 1000 fps encoding - they come out correctly, according to ffprobe/mediainfo.
Not sure why such strange convolved method of checking framerate was choosen... Only mpeg1/2 in ffmpeg-4.4 set those .supported->framerates arrays.. (grep supported_framerates libavcodec/*.c)
$ grep supported_framerates thirdparty/ffmpeg-4.4/libavcodec/*.c thirdparty/ffmpeg-4.4/libavcodec/mpeg12enc.c: .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
thirdparty/ffmpeg-4.4/libavcodec/mpeg12enc.c: .supported_framerates = ff_mpeg2_frame_rate_tab,
$
In theory this fix should also 'fix' high-fps proxies with mpeg2 (non-standart stream, but only ffmpeg supposed to read it..) Just checked ffmpeg/mpeg type and it works....
I can do 60 FPS and below with no issue. Everything is rock solid stable and very performant.
I am using Cin gg latest on Ubuntu.
My source video is 2560x1440 at 90FPS.
What I've been doing:
- start new project
- Settings -> Format, manually type 90.000 in "Frame Rate". Ensure that 2560 and 1440 are in Width and Height accordingly. Then I click apply, then click OK.
- load my file through resources. right click on thumb of my video in resources, and choose "match all".
Then when I render my project with "File Format" of "FFMPEG" and "type" of "mp4" I get these error message windows/errors:
One error window with:
------------
"Couldn't open /path/to/outfile.mp4"
------------
and another window titled "Cinelerra: Messages" with this in it:
--------------
int FFMPEG:open_encoder(const char*, const char*):
check_frame_rate failed /path/to/outfile.mp4
---------
Am I doing something wrong?
Thank you in advance.