> On Jun 5, 2025, at 22:56, James Almer <jamr...@gmail.com> wrote:
>
> On 6/5/2025 11:54 AM, Jack Lau via ffmpeg-devel wrote:
>> Signed-off-by: Jack Lau <jacklau1...@qq.com>
>> ---
>> libavformat/whip.c | 6 ++++++
>> 1 file changed, 6 insertions(+)
>> diff --git a/libavformat/whip.c b/libavformat/whip.c
>> index 0671e23635..e7cd57400d 100644
>> --- a/libavformat/whip.c
>> +++ b/libavformat/whip.c
>> @@ -1733,6 +1733,12 @@ static av_cold int whip_init(AVFormatContext *s)
>> int ret;
>> WHIPContext *whip = s->priv_data;
>> + if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
>> + av_log(s, AV_LOG_ERROR,
>> + "WHIP: This muxer is experimental, please set -strict
>> experimental in order to enable it\n");
>> + return AVERROR_EXPERIMENTAL;
>> + }
>> +
>> if ((ret = initialize(s)) < 0)
>> goto end;
>
> I think the AVFMT_EXPERIMENTAL flag is used for this.
I’ve tried this, but the whip runs normally even I don’t set `-strict
experimental`
@@ -1913,7 +1913,7 @@ const FFOutputFormat ff_whip_muxer = {
.p.long_name = NULL_IF_CONFIG_SMALL("WHIP(WebRTC-HTTP ingestion
protocol) muxer"),
.p.audio_codec = AV_CODEC_ID_OPUS,
.p.video_codec = AV_CODEC_ID_H264,
- .p.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
+ .p.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE |
AVFMT_EXPERIMENTAL,
.p.priv_class = &whip_muxer_class,
.priv_data_size = sizeof(WHIPContext),
.init = whip_init,
> ffmpeg -re -i input.mp4 -c copy -f whip
> "http://localhost:1985/rtc/v1/whip/?app=live&stream=livestream";
ffmpeg version N-119824-gbdf45d079e Copyright (c) 2000-2025 the FFmpeg
developers
built with Apple clang version 17.0.0 (clang-1700.0.13.5)
configuration: --enable-gpl --enable-shared --disable-static
--disable-optimizations --enable-libx264 --enable-libx265 --enable-libopus
--enable-sdl2 --enable-debug=3 --disable-stripping --enable-openssl
--enable-version3
libavutil 60. 3.100 / 60. 3.100
libavcodec 62. 3.101 / 62. 3.101
libavformat 62. 0.102 / 62. 0.102
libavdevice 62. 0.100 / 62. 0.100
libavfilter 11. 0.100 / 11. 0.100
libswscale 9. 0.100 / 9. 0.100
libswresample 6. 0.100 / 6. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf60.9.100
comment : vid:v0300fg10000cgho9hjc77u1ugkqvn10
Duration: 00:01:47.40, start: 0.000000, bitrate: 5716 kb/s
Stream #0:0[0x1](und): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9],
5613 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
Metadata:
handler_name : VideoHandler
vendor_id : [0][0][0][0]
encoder : Lavc60.21.100 libx264
Stream #0:1[0x2](und): Audio: opus (Opus / 0x7375704F), 48000 Hz, stereo,
fltp, 95 kb/s (default)
Metadata:
handler_name : SoundHandler
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
[WHIP muxer @ 0x119808200] WHIP: Muxer state=11, buffer_size=4096,
max_packet_size=1184,
elapsed=96ms(init:9,offer:0,answer:25,udp:0,ice:5,dtls:54,srtp:0)
Output #0, whip, to
'http://localhost:1985/rtc/v1/whip/?app=live&stream=livestream':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
comment : vid:v0300fg10000cgho9hjc77u1ugkqvn10
encoder : Lavf62.0.102
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661),
yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 5613
kb/s, 30 fps, 30 tbr, 90k tbn (default)
Metadata:
handler_name : VideoHandler
vendor_id : [0][0][0][0]
encoder : Lavc60.21.100 libx264
Stream #0:1(und): Audio: opus (Opus / 0x7375704F), 48000 Hz, stereo, fltp, 95
kb/s (default)
Metadata:
handler_name : SoundHandler
vendor_id : [0][0][0][0]
Press [q] to stop, [?] for help
[WHIP muxer @ 0x119808200] WHIP: Dispose resource
http://localhost:1985/rtc/v1/whip/?action=delete&token=i540z3223&app=live&stream=livestream&session=a2093739:93b7d050
ok
[out#0/whip @ 0x14a905320] video:1738KiB audio:25KiB subtitle:0KiB other
streams:0KiB global headers:0KiB muxing overhead: unknown
frame= 62 fps= 32 q=-1.0 Lsize=N/A time=00:00:02.03 bitrate=N/A speed=1.04x
elapsed=0:00:01.94
I noticed the AVFMT_EXPERIMENTAL flag was used in this code:
format.c
186 while ((fmt1 = av_demuxer_iterate(&i))) {
187 if (fmt1->flags & AVFMT_EXPERIMENTAL)
188 continue;
So maybe the AVFMT_EXPERIMENTAL is only valid to demuxer for now?
>
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